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A kind of preparation method of lithium ion battery

A lithium-ion battery and voltage technology, which is applied in the manufacture of electrolyte batteries, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of poor battery cycle performance, increased electrolyte decomposition speed, and attenuation of battery cycle life.

Active Publication Date: 2021-09-14
自贡市吉欣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium nickel manganese oxide material, as a common positive electrode active material for power lithium-ion batteries, has the advantages of high operating voltage and high energy density, but due to the nickel and manganese elements in the process of battery charge and discharge cycle, the activity will be reduced. A small amount of dissolution on the surface of the material will cause the electrolyte to decompose and produce gas on the surface of the electrode active material, resulting in poor cycle performance of the battery
Especially in a high temperature environment, the decomposition rate of the electrolyte increases, and the cycle life of the battery is seriously attenuated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Provide a positive electrode containing lithium nickel manganese oxide, and provide a negative electrode containing graphite;

[0035] 2) The non-contact positive and negative poles are placed in the first preformed electrolytic solution, the additive in the first preformed electrolytic solution is 6% by volume of vinylene carbonate, and the concentration of lithium ions in the electrolytic solution is 1.5mol / L;

[0036] 3) 0.1C constant current discharge to discharge cut-off voltage 2.75V, then pulse discharge to the first predetermined voltage 2.70V, pulse discharge current is 0.05C, discharge time is 10s, interval 2s;

[0037] 4) Take out the positive and negative electrodes in step 3 and dry them;

[0038] 5) The non-contact positive and negative poles in step 4 are placed in the second pre-formation electrolyte, and the additive in the second pre-formation electrolyte is 4% by volume of 1,3-propane sultone , the concentration of lithium ions in the electrolyte...

Embodiment 2

[0048] 1) Provide a positive electrode containing lithium nickel manganese oxide, and provide a negative electrode containing graphite;

[0049] 2) The non-contact positive and negative poles are placed in the first preformed electrolytic solution, the additive in the first preformed electrolytic solution is 8% by volume of vinylene carbonate, and the concentration of lithium ions in the electrolytic solution is 2mol / L;

[0050] 3) 0.1C constant current discharge to discharge cut-off voltage 2.75V, then pulse discharge to the first predetermined voltage 2.72V, pulse discharge current is 0.01C, discharge time is 60s, interval 5s;

[0051] 4) Take out the positive and negative electrodes in step 3 and dry them;

[0052] 5) The non-contact positive and negative poles in step 4 are placed in the second preformed electrolytic solution, and the additive in the second preformed electrolytic solution is 6% by volume of 1,3-propane sultone , the concentration of lithium ions in the e...

Embodiment 3

[0062] 1) Provide a positive electrode containing lithium nickel manganese oxide, and provide a negative electrode containing graphite;

[0063] 2) The non-contact positive and negative poles are placed in the first preformed electrolytic solution, the additive in the first preformed electrolytic solution is 7% by volume of vinylene carbonate, and the concentration of lithium ions in the electrolytic solution is 1.8mol / L;

[0064] 3) 0.1C constant current discharge to discharge cut-off voltage 2.75V, then pulse discharge to the first predetermined voltage 2.71V, pulse discharge current is 0.03C, discharge time is 30s, interval is 3s;

[0065] 4) Take out the positive and negative electrodes in step 3 and dry them;

[0066] 5) The non-contact positive and negative poles in step 4 are placed in the second pre-formation electrolyte, and the additive in the second pre-formation electrolyte is 5% by volume of 1,3-propane sultone , the concentration of lithium ions in the electrol...

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PUM

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Abstract

The invention provides a method for preparing a lithium-ion battery. The preparation method includes providing a positive electrode containing lithium nickel manganese oxide, providing a negative electrode containing graphite, and placing the positive electrode and the negative electrode in a non-contact opposite position and placing them in the first preformed In the electrolyte, discharge at a constant current to the discharge cut-off voltage, and then pulse discharge to the first predetermined voltage; take out the positive electrode and the negative electrode, and dry them; then place the positive electrode and the negative electrode opposite each other without contact, and place them in the second preformed electrolyte, Constant current charging to the charging cut-off voltage, then pulse charging to the second predetermined voltage, charging at the constant voltage of the charging cut-off voltage, and constant current charging and discharging between the charging cut-off voltage and the discharging cut-off voltage several times to obtain the lithium ion battery. The lithium-ion battery has good rate performance and high cycle life, especially high rate cycle life under high temperature environment.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery. Background technique [0002] Lithium nickel manganese oxide material, as a common positive electrode active material for power lithium-ion batteries, has the advantages of high operating voltage and high energy density, but due to the nickel and manganese elements in the process of battery charge and discharge cycle, the activity will be reduced. A small amount of dissolution on the surface of the material will cause the electrolyte to decompose and produce gas on the surface of the electrode active material, resulting in poor cycle performance of the battery. Especially in a high temperature environment, the decomposition rate of the electrolyte increases, and the cycle life of the battery is seriously attenuated. Contents of the invention [0003] The invention provides a method for preparing a lithium-ion battery. The preparation method includes providing a positive electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0567H01M10/42H01M10/44
CPCH01M10/0567H01M10/058H01M10/4235H01M10/446H01M10/448Y02E60/10Y02P70/50
Inventor 朱华锋胡应有马志乐李壮
Owner 自贡市吉欣科技有限公司