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Aging method of lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied to the aging field of lithium-ion batteries, can solve the problems of inapplicable aging methods and different performances, and achieve the effects of avoiding increase, avoiding internal resistance and improving cycle performance.

Inactive Publication Date: 2021-12-24
SUZHOU REDEFINE IND DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the production process of lithium-ion batteries, the formation and aging process can stabilize the performance of the battery and improve cycle stability. However, different battery additives have different performances, so a unified standard formation and aging method cannot be applied.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Provide a lithium-ion battery to be injected, inject the first electrolyte, the additives in the first electrolyte are sulfolene and γ-valerolactone; in the first electrolyte, sulfolene The concentration of γ-valerolactone is 2.5% by volume, and the concentration of γ-valerolactone is 1.5% by volume;

[0027] 2) Aging for 4 hours at a first predetermined temperature, where the first predetermined temperature is 65 degrees Celsius;

[0028] 3) Inject the second electrolyte, the volume ratio of the first electrolyte and the second electrolyte is 82:18; the additive in the second electrolyte is 1,3-dimethyl-2-imidazoline Ketone; in the second electrolyte solution, the concentration of 1,3-dimethyl-2-imidazolidinone is 8% by volume;

[0029] 4) Aging for 4 hours at a second predetermined temperature, where the second predetermined temperature is 50 degrees Celsius;

[0030] 5) Carry out charge-discharge formation on the aged lithium-ion battery, the charge-discharge fo...

Embodiment 2

[0032] 1) Provide a lithium-ion battery to be injected, inject the first electrolyte, the additives in the first electrolyte are sulfolene and γ-valerolactone; in the first electrolyte, sulfolene The concentration of γ-valerolactone is 3% by volume, and the concentration of γ-valerolactone is 2% by volume;

[0033] 2) Aging for 6 hours at a first predetermined temperature, where the first predetermined temperature is 70 degrees Celsius;

[0034] 3) Inject the second electrolyte, the volume ratio of the first electrolyte and the second electrolyte is 85:15; the additive in the second electrolyte is 1,3-dimethyl-2-imidazoline Ketone; in the second electrolyte solution, the concentration of 1,3-dimethyl-2-imidazolidinone is 10% by volume;

[0035] 4) Aging for 6 hours at a second predetermined temperature, where the second predetermined temperature is 55 degrees Celsius;

[0036] 5) Carry out charge-discharge formation on the aged lithium-ion battery, the charge-discharge forma...

Embodiment 3

[0038] 1) Provide a lithium-ion battery to be injected, inject the first electrolyte, the additives in the first electrolyte are sulfolene and γ-valerolactone; in the first electrolyte, sulfolene The concentration of γ-valerolactone is 2.8% by volume, and the concentration of γ-valerolactone is 1.8% by volume;

[0039] 2) Aging for 5 hours at a first predetermined temperature, where the first predetermined temperature is 68 degrees Celsius;

[0040] 3) Inject the second electrolyte, the volume ratio of the first electrolyte and the second electrolyte is 84:16; the additive in the second electrolyte is 1,3-dimethyl-2-imidazoline Ketone; in the second electrolyte solution, the concentration of 1,3-dimethyl-2-imidazolidinone is 9% by volume;

[0041] 4) Aging for 5 hours at a second predetermined temperature, the second predetermined temperature being 52 degrees Celsius;

[0042] 5) Carry out charge-discharge formation on the aged lithium-ion battery, the charge-discharge forma...

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PUM

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Abstract

The invention provides an aging method of a lithium ion battery. The aging method comprises the following steps of providing a plurality of lithium ion batteries to be injected, injecting a first electrolyte, aging for a preset time at a first preset temperature, injecting a second electrolyte, and aging for a preset time at a second preset temperature, then carrying out charge-discharge formation on the aged lithium ion battery. The aging method is characterized in that the additives in the first electrolyte are butadiene sulfone and gamma-valerolactone; the additive in the second electrolyte solution is 1, 3-dimethyl-2-imidazolinone; the first preset temperature is 65-70 DEG C, and the second preset temperature is 55 DEG C or below. The invention finds that the cycle performance of the battery can be effectively improved by matching three additives including butadiene sulfone, gamma-valerolactone and 1, 3-dimethyl-2-imidazolinone, and further finds that if the additives contain 1, 3-dimethyl-2-imidazolinone, the internal resistance of the battery can be increased and the rate capability of the battery can be reduced when the battery is aged at 55 DEG C or above, so that by adopting two-temperature-section aging, the rate capability of the battery is maintained while the cycle performance is improved.

Description

technical field [0001] The invention relates to an aging method for a lithium ion battery. Background technique [0002] In the production process of lithium-ion batteries, the formation and aging process can stabilize the performance of the battery and improve cycle stability, but different battery additives have different performances, so a unified standard formation and aging method cannot be applied. Contents of the invention [0003] The present invention provides a lithium ion battery aging method, which includes providing a plurality of lithium ion batteries to be injected, injecting a first electrolyte, then aging at a first predetermined temperature for a predetermined time, and then injecting a second electrolyte, Aging at a second predetermined temperature for a predetermined time, and then charging and discharging the aged lithium-ion battery; it is characterized in that, the additives in the first electrolyte are sulfolene and γ-valerolactone; the The additiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李壮吴迪
Owner SUZHOU REDEFINE IND DESIGN CO LTD