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A method for forming a lithium-ion secondary battery that improves the high and low temperature performance of the battery

A lithium-ion battery, low-temperature performance technology, applied in the field of lithium-ion batteries, can solve the problems of easy detachment, dissolution deposition, low-temperature performance of lithium-ion batteries, etc., to achieve the effects of not easy to detach or decompose, protect electrodes, and improve low-temperature performance

Active Publication Date: 2017-03-15
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the secondary formed SEI film in the prior art is still easy to fall off and dissolve and deposit during high-temperature circulation or high-temperature storage, so that the high-temperature performance of the lithium-ion battery is very low; The SEI film is not easy to fall off under high and low temperature environment for a long time, and it still protects the electrode. The method of improving the high and low temperature performance of the battery

Method used

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  • A method for forming a lithium-ion secondary battery that improves the high and low temperature performance of the battery
  • A method for forming a lithium-ion secondary battery that improves the high and low temperature performance of the battery
  • A method for forming a lithium-ion secondary battery that improves the high and low temperature performance of the battery

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Embodiment 1

[0032] The method for improving the high and low temperature performance of the lithium ion battery of the present invention comprises:

[0033] (1) Under the condition that the moisture content in the glove box is less than or equal to 10.63ppm, inject electrolyte A containing 10wt% ethylene carbonate into the assembled lithium-ion battery (LiPF in electrolyte A 6 The concentration is 1M, the rest is solvent diethyl carbonate and ethyl formate), the lithium-ion battery after filling the liquid is first aged at 25°C for 48h, and then formed at 0.005°C to 0.2% of the battery’s nominal capacity. Centrifuge to remove all the electrolyte in the battery;

[0034] (2) Under the condition that the moisture content in the glove box is less than or equal to 10.63ppm, inject electrolyte B containing 0.5wt% vinylene carbonate into the lithium-ion battery (LiPF in electrolyte B 6 The concentration is 1M, and the rest is solvent ethylene carbonate and dimethyl carbonate), then the battery...

Embodiment 2

[0040] The method for improving the high and low temperature performance of the lithium ion battery of the present invention comprises:

[0041](1) Under the condition that the moisture content in the glove box is less than or equal to 10.63ppm, inject electrolyte A containing 0.5wt% ethylene carbonate into the assembled lithium-ion battery (LiPF in electrolyte A 6 The concentration is 1M, the rest is solvent ethylene carbonate and ethyl methyl carbonate), the lithium-ion battery after filling the liquid is first aged at 50°C for 24 hours, and then formed at 0.03°C to 3% of the battery’s nominal capacity. Put the once-formed battery at room temperature for 6 hours, put the liquid injection hole down, place it in a vacuum box, evacuate it to below -0.085Mpa, and keep it for 3 minutes to remove all the electrolyte;

[0042] (2) Under the condition that the moisture content in the glove box is less than or equal to 10.63ppm, inject electrolyte B containing 10wt% triallyl isocyanu...

Embodiment 3

[0044] The method for improving the high and low temperature performance of the lithium ion battery of the present invention comprises:

[0045] (1) Under the condition that the moisture content in the glove box is less than or equal to 10.63ppm, inject electrolyte A containing 1wt% fluoroethylene carbonate into the assembled lithium-ion battery (LiPF in electrolyte A 6 The concentration is 1M, the rest is solvent dimethyl carbonate and propylene carbonate), the lithium-ion battery after filling the liquid is first aged at 40°C for 36h, and then converted to 0.5% of the battery’s nominal capacity at 0.01°C. Put the once-formed battery at room temperature for 6 hours, put the liquid injection hole down, place it in a vacuum box, evacuate it to below -0.085Mpa, and keep it for 3 minutes to remove all the electrolyte;

[0046] (2) Under the condition that the moisture content in the glove box is less than or equal to 10.63ppm, inject electrolyte B containing 2wt% vinyl acetate in...

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Abstract

The invention discloses a method for improving the high and low temperature performance of a lithium-ion battery, which comprises injecting an electrolyte A containing a low-temperature film-forming agent into an assembled lithium-ion battery, performing one-time aging and one-time formation in sequence, and one-time formation to the battery After 0.2-3% of the nominal capacity, remove all the electrolyte; then inject the electrolyte B containing a high-temperature film-forming agent into the lithium-ion battery, and perform secondary aging and secondary formation in sequence, and the secondary formation reaches the desired level. After 10-16% of the nominal capacity of the above-mentioned battery, it can be sealed. The prepared lithium-ion battery has high low-temperature performance and high-temperature performance at the same time, and can adapt to various working environments.

Description

technical field [0001] The invention relates to a formation method for simultaneously improving the high-temperature performance and low-temperature performance of a lithium-ion secondary battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] During the formation process of lithium-ion batteries, an SEI film will be formed at the interface between the two electrodes and the electrolyte. Since the SEI film on the negative electrode can significantly reduce the collapse of the electrode material in high and low temperature environments and prolong the service life of the electrode, the industry has been There have been studies focusing on improving the high and low temperature performance of Li-ion batteries by forming an SEI film on the negative electrode. [0003] The traditional method of forming an SEI film on the negative electrode is to inject an electrolyte solution containing a high and low temperature film-forming agent into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 江文锋颜海鹏张学全
Owner BYD CO LTD