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Method for lowering gas production in high temperature storage of high-nickel battery

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: 2017-07-07
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 lowering gas production in high temperature storage of high-nickel battery
  • Method for lowering gas production in high temperature storage of high-nickel battery
  • Method for lowering gas production in high temperature storage of high-nickel battery

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 invention provides a method for lowering gas production in high temperature storage of a high-nickel battery. The method comprises the following steps of performing mixing and stirring on a positive electrode material and a gas production suppression additive to obtain positive electrode paste; coating a positive electrode current collector with the positive electrode paste, and performing drying treatment to form a positive electrode plate; enabling the positive electrode plate, a matched negative electrode plate and a diaphragm to be assembled in a battery shell, and then performing electrolyte injection to the battery shell for the first time; standing for an appointed time at an appointed temperature, and then performing formation treatment; and after discharging gas from the battery shell, performing electrolyte injection for the second time. By virtue of the method, the problem of gas production in high temperature storage of the battery which takes the high nickel material as the positive electrode can be relieved; the added gas production suppression additive only performs film formation on the positive electrode, so that loss on the negative electrode can be lowered, and the utilization rate of the additive is improved; and the gas production suppression additive is added only in a positive electrode paste mixing stage, so that the usage amount of the gas production suppression additive is lowered while a condition of lithium separating-out from the positive electrode is also relieved.

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