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CN-122025535-A - Battery and electricity utilization device

CN122025535ACN 122025535 ACN122025535 ACN 122025535ACN-122025535-A

Abstract

The present application relates to a battery and an electric device. The battery comprises an electrode plate, wherein the electrode plate comprises a current collector and a film layer arranged on at least one side of the current collector, the film layer comprises an active substance and an adsorption polymer, the adsorption polymer is added into a preset electrolyte at 45 ℃ to form a polymer system, the polymer system is kept stand for 60 hours at 45 ℃ and is kept stand for more than or equal to 24 hours at 25 ℃, a first substance is left after the polymer system is filtered by a 200-mesh filter screen, the mass of the adsorption polymer is n and is expressed in g, the mass of the first substance is m1 and the mass of the first substance is expressed in g, the mass of the adsorption polymer and the first substance are expressed in m 1 /n and are expressed in m 35, the mass of the second substance is expressed in m2 and the mass of the second substance is expressed in g, and the mass of the second substance and the first substance are expressed in m 2 /n and are expressed in m 1.00-1.05, and the first substance is dried at 60 ℃ and is expressed in more than or equal to 24 hours.

Inventors

  • WU KAI
  • JIN HAIZU
  • Peng Shuangjuan
  • PENG LIN
  • LI BAIQING
  • ZHAO FENGGANG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20231103
Priority Date
20230113

Claims (11)

  1. 1. A battery comprises an electrode plate, wherein the electrode plate comprises a current collector and a film layer arranged on at least one side of the current collector, the film layer comprises active substances and adsorption polymers, Wherein, the The adsorption polymer is added into a preset electrolyte at 45 ℃ to form a polymer system, wherein the preset electrolyte comprises dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and lithium hexafluorophosphate, the mass of the dimethyl carbonate, the mass of the methyl ethyl carbonate and the mass of the ethylene carbonate are the same, and the concentration of the lithium hexafluorophosphate is 1mol/L; The polymer system is kept stand for 60 hours at 45 ℃, and after the polymer system is kept stand for more than or equal to 24 hours at 25 ℃, the polymer system is filtered by a 200-mesh filter screen to obtain a first substance, the mass of the adsorption polymer is n, the unit of the adsorption polymer is g, the mass of the first substance is m 1 , the unit of the adsorption polymer is g, and the adsorption polymer and the first substance meet the conditions that m 1 /n is more than or equal to 3 and less than or equal to 35; Drying the first substance at 60 ℃ for more than or equal to 24 hours to obtain a second substance, wherein the mass of the second substance is m 2 , the unit of the second substance is g, and the second substance and the first substance meet that m 2 /n is more than or equal to 1.00 and less than or equal to 1.05.
  2. 2. A battery comprises an electrode plate, wherein the electrode plate comprises a current collector and a film layer arranged on at least one side of the current collector, the film layer comprises active substances and adsorption polymers, Wherein, the The adsorption polymer is added into a preset electrolyte at 45 ℃ to form a polymer system, the mass ratio of the preset electrolyte to the adsorption polymer is 15:1, the preset electrolyte comprises dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and lithium hexafluorophosphate, the mass of the dimethyl carbonate, the mass of the methyl ethyl carbonate and the mass of the ethylene carbonate are the same, and the concentration of the lithium hexafluorophosphate is 1mol/L; The polymer system is kept stand for 60 hours at 45 ℃, and after the polymer system is kept stand for more than or equal to 24 hours at 25 ℃, the polymer system is filtered by a 200-mesh filter screen to obtain a first substance, the mass of the adsorption polymer is n, the unit of the adsorption polymer is g, the mass of the first substance is m 1 , the unit of the adsorption polymer is g, and the adsorption polymer and the first substance meet the conditions that m 1 /n is more than or equal to 3 and less than or equal to 35; Drying the first substance at 60 ℃ for more than or equal to 24 hours to obtain a second substance, wherein the mass of the second substance is m 2 , the unit of the second substance is g, and the second substance and the first substance meet that m 2 /n is more than or equal to 1.00 and less than or equal to 1.05.
  3. 3. The battery of claim 1 or 2, wherein 5≤m 1 /n≤35.
  4. 4. A battery according to any one of claims 1 to 3, wherein the mass content of the adsorption polymer is less than or equal to 5%, optionally 0.05% to 5%, based on the total mass of the film layer; Optionally, the electrode plate is a positive electrode plate, and further optionally, the mass content of the adsorption polymer is 0.05 to 2 percent based on the total mass of the film layer; optionally, the electrode plate is a negative electrode plate, and further optionally, the mass content of the adsorption polymer is 1-5% based on the total mass of the film layer; And/or The coating weight of the adsorbing polymer is 0.5mg/1540.25mm 2 to 2mg/1540.25mm 2 .
  5. 5. The battery of any of claims 1-4, wherein the adsorption polymer comprises a fluoropolymer, 12-m 1 /n-31; Alternatively, the process may be carried out in a single-stage, The crystallinity of the fluoropolymer measured by differential scanning calorimetry is Xc 1 %,0＜Xc 1 -30, alternatively Xc 1 -25; The melting temperature of the fluoropolymer is T m1 ℃,0＜T m1 -140, alternatively, 81- m1 -130; further alternatively, the fluoropolymer has a glass transition temperature T g1 ℃,-150≤T g1 -60, alternatively, 5-T g1 -25; Still further alternatively, the fluoropolymer includes at least one of a compound represented by the formula (AI) to a compound represented by the formula (AIII), A compound of the formula (AI), The formula (AII), In the formula (AI) and the formula (AII), R 11 、R 12 、R 13 and R 14 each independently include a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, a substituted or unsubstituted C1-C3 alkyl group, or a substituted or unsubstituted C1-C3 alkoxy group, and at least one of R 11 、R 12 、R 13 and R 14 contains a fluorine atom; the compound of formula (AIII), In formula (AIII), R 15 comprises a single bond, substituted or unsubstituted C1-C3 alkyl; p is selected from any positive integer from 1 to 3; n is selected from any positive integer from 1000 to 30000.
  6. 6. The battery of any one of claims 1-5, wherein the adsorption polymer comprises an ether polymer, 7-m 1 /n-15; Alternatively, the ether polymer is made into a sheet structure, the sheet structure is subjected to dynamic frequency scanning test at (T m2 +20) DEGC to obtain an elastic modulus G '-energy dissipation modulus G' curve, the slope of the elastic modulus G '-energy dissipation modulus G' curve is K 1 ,1＜K 1 ＜∞,T m2 ℃ and represents the melting temperature of the ether polymer, alternatively, 1<K 1 is less than or equal to 100, further alternatively, 1<K 1 is less than or equal to 10, further alternatively, 1.1 is less than or equal to K 1 is less than or equal to 2; Optionally, the glass transition temperature of the ether polymer is T g2 ℃,-100≤T g2 -50, optionally, -80-30T g2 , optionally, -65-0T g2 ; Further alternatively, the ether polymer includes at least one of a compound represented by formula (BI) and a compound represented by formula (BII), Formula (BI), In formula (BI), R 21 and R 22 each independently comprise a hydrogen atom, a substituted or unsubstituted C1-C3 alkyl group, or a substituted or unsubstituted C1-C3 alkoxy group, R 23 comprises a substituted or unsubstituted C1-C5 alkylene group; The formula (BII), In the formula (BII), R 24 to R 27 each independently include a hydrogen atom, a substituted or unsubstituted C1-C3 alkyl group, a substituted or unsubstituted C1-C3 alkoxy group, or an ether group, and at least one of R 24 to R 27 contains a substituted or unsubstituted C1-C3 alkoxy group or an ether group; the polymerization degree n of the ether polymer is selected from any positive integer from 1500 to 25000.
  7. 7. The battery of any of claims 1-6, wherein the adsorption polymer comprises the ester polymer, 15-m 1 /n-25; Alternatively, the process may be carried out in a single-stage, The ester polymer is made into a sheet structure, the sheet structure is subjected to dynamic frequency scanning test at (T m3 +20) DEGC to obtain an elastic modulus G '-energy consumption modulus G' curve, the slope of the elastic modulus G '-energy consumption modulus G' curve is K 2 ,1＜K 2 ＜∞,T m3 ℃ and represents the melting temperature of the ester polymer, alternatively 1<K 2 is less than or equal to 100, further alternatively 1<K 2 is less than or equal to 10, further alternatively 1.1 is less than or equal to K 2 is less than or equal to 2; Optionally, the glass transition temperature of the ester polymer is T g3 ℃,-100≤T g3 -50, optionally, -80-30T g3 , and further optionally, -50-0T g3 ; further alternatively, the ester polymer includes at least one of a compound represented by formula (CI) to a compound represented by formula (CIII), (CI), In the formula (CI), R 31 、R 32 and R 33 each independently comprise a hydrogen atom or a substituted or unsubstituted C1-C8 alkyl group, R 34 comprises a substituted or unsubstituted C1-C8 alkyl group or a substituted or unsubstituted C1-C8 hydroxyalkyl group; The formula (CII), In formula (CII), R 35 comprises a substituted or unsubstituted C2-C6 methylene group, alternatively R 35 each independently comprises a substituted or unsubstituted C2-C4 methylene group; The formula (CIII), In formula (CIII), R 36 、R 37 and R 38 each independently comprise a hydrogen atom, or a substituted or unsubstituted C1-C8 alkyl group, R 39 comprises a substituted or unsubstituted C1-C8 alkyl group; Alternatively, R 36 、R 37 and R 38 each independently comprise a hydrogen atom, a substituted or unsubstituted C1-C4 alkyl group; The polymerization degree n of the ester polymer is selected from any positive integer from 800 to 20000.
  8. 8. The battery according to any one of claims 1 to 7, wherein the adsorption polymer comprises an aldehyde ketone polymer, 7≤m 1 /n≤12; Alternatively, the process may be carried out in a single-stage, The aldehyde ketone polymer is made into a sheet structure, the sheet structure is subjected to dynamic frequency scanning test at (T m4 +20) DEGC to obtain an elastic modulus G '-energy consumption modulus G' curve, the slope of the elastic modulus G '-energy consumption modulus G' curve is K 3 ,0.8≤K 3 ＜∞,T m4 ℃ and represents the melting temperature of the aldehyde ketone polymer, optionally, K 3 is more than or equal to 0.8 and less than or equal to 100, further optionally, K 3 is more than or equal to 0.8 and less than or equal to 10, and further optionally, K 3 is more than or equal to 0.8 and less than or equal to 1; Optionally, the aldehyde ketone polymer has a glass transition temperature T g4 ℃,-100≤T g4 ≤50, optionally, -80≤T g4 ≤30, and further optionally, -53≤T g4 ≤55; Further alternatively, the aldehyde ketone polymer includes at least one of a compound represented by formula (DI) and a compound represented by formula (DII), The composition of the composition (DI), In the formula (DI), R 41 comprises a single bond, a substituted or unsubstituted C1-C6 methylene group, R 42 comprises a hydrogen atom, a substituted or unsubstituted C1-C6 alkyl group; The formula (DII), In the formula (DII), R 43 to R 46 each independently include a hydrogen atom, a hydroxyl group, a substituted or unsubstituted C1-C3 alkyl group, a substituted or unsubstituted C1-C3 hydroxyalkyl group, or a substituted or unsubstituted C1-C3 alkoxy group; r and s are each independently selected from integers from 0 to 5, and at least one of r and s is selected from any positive integer; the polymerization degree n of the aldehyde ketone polymer is selected from any positive integer of 500 to 15000.
  9. 9. The battery of any one of claims 1 to 8, wherein the adsorption polymer has a molecular weight of 2.0 x 10 5 g/mol to 1.2 x 10 6 g/mol.
  10. 10. The battery according to any one of claims 1 to 9, wherein, The electrode plate is a positive electrode plate, the positive electrode plate comprises a positive electrode current collector and a positive electrode film layer arranged on at least one side of the positive electrode current collector, the positive electrode film layer comprises a positive electrode active substance and an adsorption polymer, and the positive electrode active substance comprises at least one of an olivine-type phosphate active substance and a layered structure positive electrode active substance; And/or The electrode plate is a negative electrode plate, the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active substance and an adsorption polymer, and the negative electrode active substance can comprise at least one of natural graphite, artificial graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate.
  11. 11. An electrical device comprising a battery according to any one of claims 1 to 10.

Description

Battery and electricity utilization device The application is based on the application number 202311457180.1, the application date 2023, 11 and 03, and the application is a divisional application of the application named electrode plate, battery and electricity utilization device of New energy science and technology Co., ltd in the Ningde era. Citation of related application The present application claims priority from international patent application PCT/CN2023/072036 entitled "polymer, pole piece and its associated battery cells, batteries and electrical devices" filed on 13, 2023, 01, the entire contents of which are incorporated herein by reference. The present application also claims priority from international patent application PCT/CN2023/076843 entitled "ether polymers, pole pieces and their associated battery cells, batteries and electrical devices" filed on month 17 of 2023, which application is incorporated herein by reference in its entirety. The present application also claims priority from international patent application PCT/CN2023/076793 entitled "ester polymers, pole pieces and their associated battery cells, batteries and electrical devices" filed on month 17 of 2023, which application is incorporated herein by reference in its entirety. The present application also claims priority from international patent application PCT/CN2023/076789 entitled "aldehyde ketone polymer, pole piece and its associated battery cells, batteries and electrical devices" filed on month 17 of 2023, the entire contents of which are incorporated herein by reference. Technical Field The present application relates to a battery and an electric device. Background The battery has characteristics of high capacity, long life, and the like, and thus is widely used in electronic devices such as mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools, and the like. As the battery application range increases, the requirements for battery performance become increasingly stringent. However, the cycle performance of the battery needs to be further improved. Disclosure of Invention The present application has been made in view of the above problems, and an object thereof is to provide a battery and an electric device. In a first aspect, the application provides a battery comprising an electrode sheet comprising a current collector and a membrane layer arranged on at least one side of the current collector, the membrane layer comprising an active substance and an adsorption polymer, Wherein, the The adsorption polymer is added into a preset electrolyte at 45 ℃ to form a polymer system, wherein the preset electrolyte comprises dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and lithium hexafluorophosphate, the mass of the dimethyl carbonate, the mass of the methyl ethyl carbonate and the mass of the ethylene carbonate are the same, and the concentration of the lithium hexafluorophosphate is 1mol/L; Standing the polymer system for 60 hours at 45 ℃, and after standing for more than or equal to 24 hours at 25 ℃, filtering the polymer system by a 200-mesh filter screen to obtain a first substance, wherein the mass of the adsorbed polymer is n, the unit of the adsorbed polymer is g, the mass of the first substance is m 1, the unit of the first substance is g, and the adsorbed polymer and the first substance meet the conditions that m 1/n is more than or equal to 3 and less than or equal to 35; Drying the first substance at 60 ℃ for more than or equal to 24 hours to obtain a second substance, wherein the mass of the second substance is m 2, the unit of the second substance is g, and the second substance and the first substance meet that m 2/n is more than or equal to 1.00 and less than or equal to 1.05. In a second aspect, the application provides a battery comprising an electrode sheet comprising a current collector and a membrane layer arranged on at least one side of the current collector, the membrane layer comprising an active substance and an adsorption polymer, Wherein, the The adsorption polymer is added into a preset electrolyte at 45 ℃ to form a polymer system, the mass ratio of the preset electrolyte to the adsorption polymer is 15:1, the preset electrolyte comprises dimethyl carbonate, methyl ethyl carbonate, ethylene carbonate and lithium hexafluorophosphate, the masses of the dimethyl carbonate, the methyl ethyl carbonate and the ethylene carbonate are the same, and the concentration of the lithium hexafluorophosphate is 1mol/L; Standing the polymer system for 60 hours at 45 ℃, and after standing for more than or equal to 24 hours at 25 ℃, filtering the polymer system by a 200-mesh filter screen to obtain a first substance, wherein the mass of the adsorbed polymer is n, the unit of the adsorbed polymer is g, the mass of the first substance is m 1, the unit of the first subst