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Formation process of high-nickel ternary system lithium battery

A ternary system, lithium battery technology, applied in non-aqueous electrolyte battery, electrolyte battery manufacturing, sustainable manufacturing/processing, etc., can solve the problem of low quality of passivation film, and achieve the effect of high discharge capacity retention rate

Inactive Publication Date: 2018-10-02
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of gas generation and low passivation film quality in the formation process of existing lithium-ion batteries, the present invention proposes a formation process for high-nickel ternary lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The formation process of high-nickel ternary system lithium battery, the formation process includes the following steps:

[0039] a. Use platinum-doped aluminum-plastic composite film to side seal and cap the lithium battery casing, and reserve 90% more platinum-doped aluminum-plastic composite film on one side of the casing; a liquid injection port is left on the lithium battery casing;

[0040] b. Inject the electrolyte solution containing sodium fluoride through the liquid injection port under the carbon dioxide atmosphere, then pass in the mixed gas of carbon dioxide, fluorine gas and sulfur dioxide, and then seal the liquid injection port; among them, the volume of carbon dioxide, fluorine gas and sulfur dioxide The ratio is 30:1.8:1.3

[0041] c. Under the environment of 3℃~50℃, charge and discharge the sealed lithium battery three times. The three times of charging are constant current charging A1, A2, A3, and the charging voltage reaches the specified value V1, ...

Embodiment 2

[0047] The formation process of high-nickel ternary system lithium battery, the formation process includes the following steps:

[0048] a. Use platinum-doped aluminum-plastic composite film to side seal and cap the lithium battery casing, and reserve 80% more platinum-doped aluminum-plastic composite film on one side of the casing; a liquid injection port is left on the lithium battery casing;

[0049] b. Inject the electrolyte solution containing sodium fluoride through the liquid injection port under the carbon dioxide atmosphere, then pass in the mixed gas of carbon dioxide, fluorine gas and sulfur dioxide, and then seal the liquid injection port; among them, the volume of carbon dioxide, fluorine gas and sulfur dioxide The ratio is 34:2:1.6

[0050] c. Under the environment of 3℃~50℃, charge and discharge the sealed lithium battery three times. The three times of charging are constant current charging A1, A2, A3, and the charging voltage reaches the specified value V1, V2...

Embodiment 3

[0056] The formation process of high-nickel ternary system lithium battery, the formation process includes the following steps:

[0057] a. Use platinum-doped aluminum-plastic composite film to seal the side and top of the lithium battery case, and reserve 110% more platinum-doped aluminum-plastic composite film on one side of the case; there is a liquid injection port on the lithium battery case;

[0058] b. Inject the electrolyte solution containing sodium fluoride through the liquid injection port under the carbon dioxide atmosphere, then pass in the mixed gas of carbon dioxide, fluorine gas and sulfur dioxide, and then seal the liquid injection port; among them, the volume of carbon dioxide, fluorine gas and sulfur dioxide The ratio is 25:1.6:1.

[0059] c. Under the environment of 3℃~50℃, charge and discharge the sealed lithium battery three times. The three times of charging are constant current charging A1, A2, A3, and the charging voltage reaches the specified value V1...

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Abstract

The invention relates to a formation process of a high-nickel ternary system lithium battery and belongs to the field of battery formation processes. The formation process comprises the following steps of (a) carrying out side sealing and top sealing on a lithium battery shell by using a platinum-doped aluminum-plastic composite film, reserving more than 60-120% of platinum-doped aluminum-plasticcomposite film at one side of the shell and reserving a liquid injection opening in the lithium battery shell; (b) injecting an electrolyte containing sodium fluoride through the liquid injection opening in a carbon dioxide atmosphere, introducing a mixed gas of carbon dioxide, a fluorine gas and sulfur dioxide and then sealing the liquid injection opening; and (c) reaching high temperature from low temperature, carrying out charging and discharging for three times, carrying out vacuum-pumping sealing after formation is ended, extracting the gas generated during formation and cutting away thereserved more than 60-120% of platinum-doped aluminum-plastic composite film. According to the formation process, the content of lithium fluoride, lithium sulfite and the like in an SEI film is increased through introducing diluted fluorine gas and sulfur dioxide in the formation process, so that the SEI film is more stable and denser.

Description

technical field [0001] The invention relates to a formation process of a high-nickel ternary system lithium battery, belonging to the field of battery formation processes. Background technique [0002] The current commercialized power lithium-ion batteries are mainly lithium cobaltate, lithium manganate, lithium iron phosphate and nickel-cobalt-manganese ternary batteries. Power batteries require batteries with high energy density (corresponding to high cruising range) and high safety, while lithium cobalt oxide is not suitable for the field of power batteries because of its poor thermal stability (poor safety) (but with high pressure Density and energy density are currently the mainstream in the 3C field), while lithium manganese oxide has a low energy density and its application is limited. As an earlier developed technology, lithium iron phosphate has the advantages of excellent safety, environmental protection, and high cycle life, but the disadvantage is that The energ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 陈庆赵海林
Owner CHENDU NEW KELI CHEM SCI CO LTD
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