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Method for reducing high-temperature storage gas production of high-nickel batteries

A battery and high-temperature technology, applied in electrical components, battery electrodes, secondary batteries, etc., can solve the problems of battery high-temperature storage and gas production

Active Publication Date: 2019-02-19
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for reducing high-temperature storage gas production of high-nickel batteries, and to solve the problem of high-temperature storage gas production of batteries with high-nickel materials at the positive electrode

Method used

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  • Method for reducing high-temperature storage gas production of high-nickel batteries
  • Method for reducing high-temperature storage gas production of high-nickel batteries
  • Method for reducing high-temperature storage gas production of high-nickel batteries

Examples

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Effect test

example 1

[0060] The positive electrode material is NCM523. During stirring, the experimental group added 0.5% PS of the positive electrode material mass, and made a 2Ah soft pack battery according to the above process, and its working voltage was 2.8-4.4V. Here, the quality of the positive electrode material only refers to the quality of the ternary active material, not including other additives that need to be added to the positive electrode. The blank group did not add additives, and was treated according to the conventional process.

example 2

[0062] The positive electrode material is NCM523. The experimental group added PST with a mass of 0.5% of the positive electrode material mass during stirring, and made a 2Ah soft pack battery according to the above process, and its working voltage was 2.8-4.4V. Here, the quality of the positive electrode material only refers to the quality of the ternary active material, not including other additives that need to be added to the positive electrode. The blank group did not add additives, and was treated according to the conventional process.

example 3

[0064] The positive electrode material is NCM622. During stirring, the experimental group added 0.5% PS of the positive electrode material mass, and made a 2Ah soft pack battery according to the above process, and its working voltage was 2.8-4.2V. Here, the quality of the positive electrode material only refers to the quality of the ternary active material, not including other additives that need to be added to the positive electrode. The blank group did not add additives, and was treated according to the conventional process.

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Abstract

The method for reducing gas production in high-temperature storage of high-nickel batteries proposed by the present invention comprises the following steps: mixing and stirring the positive electrode material with an additive for inhibiting gas production to obtain a positive electrode slurry; coating the positive electrode slurry on a positive electrode current collector, and Carry out drying treatment to form the positive pole piece; assemble the positive pole piece, the matching negative pole piece and the diaphragm in the battery case, and then inject the electrolyte solution into the battery case for the first time; let it stand for a specified time at a specified temperature Afterwards, chemical conversion treatment is carried out; after the gas in the battery casing is discharged, the electrolyte solution is injected for the second time. Improve the problem of gas production in high-temperature storage of batteries with high-nickel materials at the positive pole; the added gas production-inhibiting additives are only formed on the positive electrode to reduce the loss on the negative electrode and improve the utilization of additives; only add the inhibitor in the positive electrode slurry mixing stage The gas-generating additive not only reduces the amount of additive used to suppress gas-generating, but also reduces the situation of anode lithium precipitation.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a method for reducing gas production of high-nickel batteries during high-temperature storage. Background technique [0002] Existing electric vehicles have the advantage of being green and environmentally friendly, but also have the disadvantage of short cruising range. In order to improve the cruising range of electric vehicles, major lithium-ion power battery companies are vigorously developing lithium batteries with high energy density. Commonly used methods to increase energy density include increasing the gram capacity of the positive and negative electrodes, increasing the battery voltage, and increasing the coating weight. [0003] As the energy density of lithium batteries is getting higher and higher, the requirements for the gram capacity of cathode materials are also getting higher and higher. One of the measures is to increase the Ni content of the positi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/42H01M10/44H01M4/62H01M10/0525
CPCH01M4/628H01M10/0525H01M10/058H01M10/4235H01M10/446Y02E60/10Y02P70/50
Inventor 褚春波王明旺梁锐
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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