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CN-122025821-A - Battery and electricity utilization device comprising same

CN122025821ACN 122025821 ACN122025821 ACN 122025821ACN-122025821-A

Abstract

The application relates to a battery and an electric device, and belongs to the technical field of batteries. According to the application, a specific first additive is added into the electrolyte, and the XPS etching analysis is controlled to be carried out on the positive plate at the etching depth of 210nm, so that the lithium supplementing effect is improved, the storage performance of the battery is improved, and the low-yield gas is considered.

Inventors

  • SHAN XUYI
  • QIN KAIYAN
  • ZHANG ZIFANG
  • ZHU XIAOXUE
  • QIAO ZHI

Assignees

  • 中创新航科技集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (20)

  1. 1. The battery is characterized by comprising a positive plate, a negative plate and a first electrolyte, wherein the first electrolyte comprises a first additive, and the first additive is a sulfate additive and/or a phosphate additive; the battery satisfies that a multiplied by b/c is more than or equal to 80 and less than or equal to 1400; Wherein a is the ratio of the peak area of Fe 3+ characteristic peak to the peak area of Ni 3+ characteristic peak in the XPS graph when XPS etching analysis is carried out on the positive plate at the etching depth of 210 nm; b percent is the capacity retention rate of the single-chip full battery containing the positive plate, the negative plate and the second electrolyte after 500 circles of charge and discharge at the temperature of 60 ℃ and at the temperature of 1C/1C, wherein the second electrolyte consists of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and lithium hexafluorophosphate, the mass ratio of the ethylene carbonate to the methyl ethyl carbonate to the diethyl carbonate is 1:1:1, and the concentration of the lithium hexafluorophosphate in the second electrolyte is 1mol/L; c% is the mass content of the first additive in the first electrolyte.
  2. 2. The battery according to claim 1, wherein the value range of a is 1.0-3.5; And/or the value range of the b% is 90% -95%; And/or the value range of the c% is 0.2% -2%.
  3. 3. The battery of claim 1, wherein the first additive is a phosphate additive.
  4. 4. The battery of claim 1, wherein the phosphate additive comprises at least one of trimethyl phosphate and triethyl phosphate.
  5. 5. The battery of claim 1, wherein the sulfate-based additive comprises at least one of vinyl sulfate, vinyl 4-fluorosulfate, and vinyl 4-methyl-sulfate.
  6. 6. The battery of claim 1, wherein the positive electrode sheet comprises a lithium-supplemented product comprising LiFeO 2 and Li x NiO 2 , wherein 0.5 +.x <1.
  7. 7. A battery as in claim 6, wherein the LiFeO 2 has a Dn50 in the range of 5-15 μm and/or, The Dn50 of Li x NiO 2 ranges from 6 to 16 μm.
  8. 8. The battery of claim 6, wherein the surface of the lithium-compensating product is provided with a carbon layer, wherein the average thickness of the carbon layer ranges from 2 nm to 20nm.
  9. 9. The battery of claim 8, wherein the average thickness of the carbon layer of LiFeO 2 ranges from 3 to 15nm and/or the average thickness of the carbon layer of Li x NiO 2 ranges from 2 to 10nm.
  10. 10. The battery of claim 1, wherein the positive electrode sheet comprises a positive electrode material comprising a lithium-supplementing agent comprising an iron lithium oxide and a nickel lithium oxide.
  11. 11. The battery of claim 10, wherein the lithium iron oxide has a chemical formula of Li 5 (Fe y M z )O 4 , y+z = 1,0< y <1, 0< z <1; the chemical formula of the nickel lithium oxide is Li 2 (Ni e Q f )O 2 , e+f=1, 0< e is less than or equal to 1, and 0< f is less than or equal to 1; m and Q are each independently selected from at least one of Mn, al, mg, ti, co.
  12. 12. The battery of claim 1, wherein the first electrolyte further comprises a second additive comprising at least one of vinylene carbonate, fluoroethylene carbonate, 1, 3-propane sultone, lithium bisoxalato borate, trimethyl phosphate.
  13. 13. The battery according to claim 12, wherein the mass content of the second additive in the first electrolyte is 0.01% -2.5%.
  14. 14. The battery of claim 1, wherein the first electrolyte further comprises a solvent and a lithium salt, wherein the solvent comprises at least one of a carbonate-based solvent, a carboxylate-based solvent, an ether-based solvent, and a nitrile-based solvent, and the lithium salt comprises at least one of lithium hexafluorophosphate and lithium difluorosulfonimide.
  15. 15. The battery of claim 1, wherein the positive electrode sheet comprises a positive electrode material further comprising a positive electrode active material comprising at least one of lithium iron phosphate, ternary material, lithium manganese iron phosphate.
  16. 16. The battery of claim 15, wherein the lithium iron phosphate comprises large particle lithium iron phosphate having a particle size of 0.8-2.0 μm and small particle lithium iron phosphate having a particle size of less than 0.8 μm and equal to or greater than 0.5 μm.
  17. 17. The battery of claim 15, wherein the lithium iron phosphate is provided with a carbon layer on a surface.
  18. 18. The battery of claim 17, wherein the average thickness of the carbon layer of lithium iron phosphate ranges from 1 nm to 20nm.
  19. 19. The battery of claim 15, wherein the lithium iron phosphate comprises a doping element selected from at least one of Al, ti, mg, ni.
  20. 20. The battery of claim 19, wherein the total content of doping elements in the positive electrode material is 100-30000 ppm.

Description

Battery and electricity utilization device comprising same Technical Field The application relates to the technical field of batteries, in particular to a battery and an electric device comprising the same. Background In the charge-discharge cycle of the lithium ion battery, side reactions such as repeated formation of SEI film, decomposition of electrolyte and the like can continuously consume lithium ions, so that the capacity attenuation of the battery is accelerated, and the performance of the battery is severely restricted. And the lithium supplementing agent can effectively compensate lithium loss in the circulation process by introducing an additional lithium source into the battery system, delay the capacity attenuation rate and improve gram capacity. However, the lithium supplementing agent faces many challenges in practical application, for example, the lithium supplementing process is often accompanied by severe gas generation, and the lithium releasing efficiency of the lithium supplementing agent is insufficient. Therefore, how to balance the lithium supplementing effect, control the gas generating behavior and ensure the battery cycle performance becomes a key technical bottleneck to be broken through in the current lithium supplementing technology. Disclosure of Invention The object of the present application is to overcome the above-mentioned drawbacks of the prior art and to provide a battery and an electric device comprising the same, the battery has good lithium supplementing effect, high gram capacity, good cycle performance and less gas production. In order to achieve the above object, in a first aspect, the present application provides a battery, including a positive electrode sheet, a negative electrode sheet, and a first electrolyte, wherein the first electrolyte contains a first additive, and the first additive is a sulfate additive and/or a phosphate additive; the battery satisfies that a multiplied by b/c is more than or equal to 80 and less than or equal to 1400; Wherein a is the ratio of the peak area of Fe 3+ characteristic peak to the peak area of Ni 3+ characteristic peak in the XPS graph when XPS etching analysis is carried out on the positive plate at the etching depth of 210 nm; b percent is the capacity retention rate of the single-chip full battery containing the positive plate, the negative plate and the second electrolyte after 500 circles of charge and discharge at the temperature of 60 ℃ and at the temperature of 1C/1C, wherein the second electrolyte consists of ethylene carbonate, methyl ethyl carbonate, diethyl carbonate and lithium hexafluorophosphate, the mass ratio of the ethylene carbonate to the methyl ethyl carbonate to the diethyl carbonate is 1:1:1, and the concentration of the lithium hexafluorophosphate in the second electrolyte is 1mol/L; c% is the mass content of the first additive in the first electrolyte. In a second aspect, the present application provides an electrical device comprising the battery. Compared with the prior art, the lithium ion battery has the beneficial effects that the specific first additive is added into the electrolyte, and the XPS etching analysis is controlled to be carried out on the positive plate at the etching depth of 210nm, so that the lithium ion battery improves the lithium supplementing effect, improves the battery storage performance and gives consideration to low gas production by controlling the ratio a of the peak area of the Fe 3+ characteristic peak to the peak area of the Ni 3+ characteristic peak in the XPS graph, the capacity retention rate b of a single full battery assembled by positive and negative plates after the single full battery is charged and discharged for 500 circles at 60 ℃ at 1C/1C, and the mass content of the first additive in the electrolyte C percent to meet the specific relation. Detailed Description For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. In the application, the technical characteristics described in an open mode comprise a closed technical scheme composed of the listed characteristics and also comprise an open technical scheme comprising the listed characteristics. In the present application, the numerical ranges are referred to as continuous, and include the minimum and maximum values of the ranges, and each value between the minimum and maximum values, unless otherwise specified. Further, when a range refers to an integer, each integer between the minimum