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CN-122029249-A - Adhesive composition, pole piece, battery, preparation method and electronic equipment

CN122029249ACN 122029249 ACN122029249 ACN 122029249ACN-122029249-A

Abstract

The application provides an adhesive composition, a pole piece, a battery, a preparation method and electronic equipment. The adhesive composition comprises an adhesive, wherein the adhesive comprises a first chain link, a second chain link and a third chain link, the first chain link is a chain link shown in a formula 1, the second chain link is a chain link shown in a formula 2, the third chain link comprises a chain link shown in a formula 3 or a formula 4, the mole percent of the first chain link is a percent, the mole percent of the second chain link is b percent, the mole percent of the third chain link is C percent, a+b+c=100, 80 is less than or equal to a <100,0 is less than or equal to 18,0 is less than or equal to C is less than or equal to 2,1 is less than or equal to 20, R 1 、R 2 、R 3 、R 4 and R 5 are respectively and independently selected from substituted or unsubstituted C1-C30 alkyl groups in the formulas 1-4, and X is halogen. The binder composition can improve the rate performance and cycle performance of the battery.

Inventors

  • GAO TIANTIAN
  • FENG HUIMEI
  • FENG DAOYAN

Assignees

  • 宁波容百新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250627

Claims (15)

  1. 1. An adhesive composition, comprising an adhesive, wherein the adhesive comprises a first chain link, a second chain link and a third chain link, the first chain link is a chain link shown in a formula 1, the second chain link is a chain link shown in a formula 2, and the third chain link comprises a chain link shown in a formula 3 or a formula 4; In the binder, the mole percentage of the first chain unit is a percent, the mole percentage of the second chain unit is b percent, and the mole percentage of the third chain unit is c percent: a+b+c=100,80≤a<100,0<b≤18,0<c≤2,1<b+c≤20; R 1 、R 2 、R 3 、R 4 、R 5 is each independently selected from substituted or unsubstituted C1-C30 alkyl; X is halogen.
  2. 2. The adhesive composition of claim 1, wherein 97≤a <99.
  3. 3. The binder composition according to claim 1 or 2, wherein the binder has a number average molecular weight of M n ,10000≤M n ≤1000000 and/or a weight average molecular weight of M w ,50000≤M w ≤5000000.
  4. 4. A binder composition as claimed in claim 1 to 3, wherein the binder has a Mooney viscosity of ML, 10≤ML≤200, and/or, The glass transition temperature of the binder is T g ,T g -10 ℃.
  5. 5. The adhesive composition according to claim 1 to 4, wherein the adhesive has a tensile strength of 0.1MPa or more and/or, The antioxidation potential of the binder is more than or equal to 4.3V.
  6. 6. The adhesive composition of any one of claims 1-5, further comprising a solvent; the dipole moment of the solvent is less than or equal to 2.5D.
  7. 7. The adhesive composition of claim 6, wherein the solvent is selected from at least one of xylene, butyl butyrate, decane, isobutyl isobutyrate, anisole, toluene, and isoparaffins.
  8. 8. The adhesive composition according to any one of claims 1 to 7, wherein the adhesive composition comprises 20% or less of the adhesive by mass.
  9. 9. The adhesive composition according to claim 8, wherein the mass percentage of the adhesive in the adhesive is 5-10%.
  10. 10. A pole piece, wherein the pole piece comprises a current collector and an active layer positioned on at least one surface of the current collector; The active layer comprising the binder composition of any one of claims 1-9.
  11. 11. The pole piece of claim 10, wherein the active layer further comprises a sulfide electrolyte.
  12. 12. A pole piece according to claim 10 or 11, wherein the peel force between the active layer and the current collector is ≡0.01N/cm.
  13. 13. A battery comprising the pole piece of any one of claims 10-12.
  14. 14. A method of making a battery, comprising: Laminating the positive plate, the solid electrolyte and the negative plate to obtain an electrode assembly, or laminating the positive plate, the solid electrolyte and the negative plate and then winding to obtain the electrode assembly; The electrode assembly is placed in an outer package and is sealed and formed to obtain the battery; Wherein the positive plate and/or the negative plate is the plate according to any one of claims 10 to 12.
  15. 15. An electronic device comprising the battery of claim 13.

Description

Adhesive composition, pole piece, battery, preparation method and electronic equipment Technical Field The application relates to the technical field of electrochemistry, in particular to an adhesive composition, a pole piece, a battery, a preparation method and electronic equipment. Background The all-solid-state battery is more suitable for being applied to a medium-sized and large-sized energy storage device due to the advantages of high safety and high energy density. The sulfide all-solid-state battery is a common all-solid-state battery, and because the solid electrolyte is in solid-solid interface contact with the positive electrode active material and/or the negative electrode active material in the sulfide all-solid-state battery, the interface impedance is larger, and the industrialization of the sulfide all-solid-state battery is limited. In the pole piece of a sulfide all-solid state battery, the active layer typically includes an active material, a sulfide electrolyte, a conductive agent, and a binder. Wherein, the binder is in direct contact with the active material, sulfide electrolyte and conductive agent in the pole piece, and the distribution of the binder not only affects the uniformity of the whole pole piece, but also directly relates to the ion and electron transmission characteristics in the positive pole piece and/or the negative pole piece. Accordingly, the binder may be modified to improve the interfacial contact problem between the positive electrode active material and/or the negative electrode active material and the solid electrolyte, thereby improving the electrochemical performance of the sulfide all-solid battery. Currently, binders commonly used in sulfide all-solid batteries include a polar binder and a nonpolar binder, wherein the polar binder has poor solubility in a nonpolar solvent and easily decomposes sulfide electrolyte, while the nonpolar binder (e.g., at least one of nitrile rubber, styrene-butadiene rubber, silicone rubber, and ethylcellulose) has good solubility in a nonpolar solvent, but has weak interaction force with an active material and a current collector, which is not only unfavorable for electron transfer, reduces the rate performance of the battery, but also easily causes poor adhesion between an active layer and the current collector, so that the cycle stability performance of the battery is poor. Disclosure of Invention In view of the above, the present application provides a binder composition in which a binder has good solubility in a low-polarity or nonpolar solvent, does not undergo side reactions with a sulfide electrolyte, does not cause degradation of the sulfide electrolyte, and has strong force between the binder and an active material and a current collector, thereby improving the rate performance and cycle performance of a battery. The application provides a pole piece, which comprises the adhesive composition, so that the pole piece can improve the multiplying power performance and the cycle performance of a battery when being used for the battery. The application provides a battery, which comprises the pole piece and has excellent multiplying power performance and cycle performance. The application provides a preparation method of a battery, which can prepare the battery, is simple to operate and is suitable for wide popularization and application. The application provides electronic equipment, which comprises the battery, and has excellent quick charge and cruising ability and wide market application prospect. The application provides an adhesive composition, which comprises an adhesive, wherein the adhesive comprises a first chain link, a second chain link and a third chain link, the first chain link is a chain link shown in a formula 1, the second chain link is a chain link shown in a formula 2, and the third chain link comprises a chain link shown in a formula 3 or a formula 4; In the binder, the mole percentage of the first chain unit is a percent, the mole percentage of the second chain unit is b percent, and the mole percentage of the third chain unit is c percent: a+b+c=100,80≤a<100,0<b≤18,0<c≤2,1<b+c≤20; R 1、R2、R3、R4、R5 is each independently selected from substituted or unsubstituted C1-C30 alkyl; X is halogen. The binder composition as described above, wherein 97≤a <99. The binder composition as described above, wherein the number average molecular weight of the binder is M n,10000≤Mn≤1000000 and/or the weight average molecular weight of the binder is M w,50000≤Mw≤5000000. The adhesive composition as described above, wherein the adhesive has a Mooney viscosity of ML, 10≤ML≤200, and/or, The glass transition temperature of the binder is T g,Tg -10 ℃. The adhesive composition as described above, wherein the adhesive has a tensile strength of 0.1MPa or more and/or, The antioxidation potential of the binder is more than or equal to 4.3V. The adhesive composition as described above, further comprising a solvent; the dipole moment of