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A kind of formation method of lithium ion battery with nickel cobalt lithium manganate positive electrode

A technology of nickel-cobalt lithium manganese oxide and lithium-ion batteries, which is applied in the field of formation of lithium-ion batteries, can solve the problems of cycle life maintenance rate to be improved, inability to release lithium ions, and large energy loss, etc., and achieve cycle life improvement and improvement effect , Increase the effect of lithium ion content

Active Publication Date: 2020-12-08
泰州纳新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formation process will lead to the loss of lithium ions in the solution, and the properties of the material itself, such as nickel-cobalt lithium manganese oxide, make it unable to release all lithium ions. As the charge and discharge progress, its energy loss is large, and the cycle life Retention rate needs to be improved

Method used

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  • A kind of formation method of lithium ion battery with nickel cobalt lithium manganate positive electrode
  • A kind of formation method of lithium ion battery with nickel cobalt lithium manganate positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Form into step a:

[0037] 1) A graphite electrode is used as the positive electrode, and a metal lithium electrode is used as the negative electrode, which is placed in the electrolyte a to form a pre-embedded lithium battery;

[0038] 2), the battery is pulse-discharged, the discharge voltage is cut off at 0.08V, the pulse discharge is a pulse current of 0.1C, and the discharge time is 60 seconds with an interval of 2 seconds;

[0039] 3), let stand for 1h;

[0040] 4) Charge the battery at a constant voltage, the charging voltage is 3V, and stop when the charging current is lower than 0.01C;

[0041] 5), the battery is pulse-discharged again, and the discharge voltage is cut off at 0.08V to obtain a graphite negative electrode pre-charged with lithium. The pulse discharge is a pulse current of 0.1C, and the discharge time is 60 seconds with an interval of 2 seconds;

[0042] Formation step b:

[0043] 1) Assembling the nickel-cobalt lithium manganese oxide positiv...

Embodiment 2

[0053] Form into step a:

[0054] 1) A graphite electrode is used as the positive electrode, and a metal lithium electrode is used as the negative electrode, which is placed in the electrolyte a to form a pre-embedded lithium battery;

[0055] 2), the battery is pulse-discharged, the discharge voltage is cut off at 0.08V, the pulse discharge is a pulse current of 0.5C, and the discharge time is 300 seconds with an interval of 5 seconds;

[0056] 3), let stand for 1h;

[0057] 4) Charge the battery at a constant voltage, the charging voltage is 3V, and stop when the charging current is lower than 0.01C;

[0058] 5), the battery is pulse-discharged again, and the discharge voltage is cut off at 0.08V to obtain a graphite negative electrode pre-charged with lithium. The pulse discharge is a pulse current of 0.5C, and the discharge time is 300 seconds with an interval of 5 seconds;

[0059] Formation step b:

[0060] 1) Assembling the nickel-cobalt lithium manganese oxide posit...

Embodiment 3

[0070] Form into step a:

[0071] 1) A graphite electrode is used as the positive electrode, and a metal lithium electrode is used as the negative electrode, which is placed in the electrolyte a to form a pre-embedded lithium battery;

[0072] 2), the battery is pulse-discharged, the discharge voltage is cut off at 0.08V, the pulse discharge is a pulse current of 0.2C, and the discharge time is 100 seconds with an interval of 3 seconds;

[0073] 3), let stand for 1h;

[0074] 4) Charge the battery at a constant voltage, the charging voltage is 3V, and stop when the charging current is lower than 0.01C;

[0075] 5), the battery is pulse-discharged again, and the discharge voltage is cut off at 0.08V to obtain a graphite negative electrode pre-charged with lithium. The pulse discharge is a pulse current of 0.2C, and the discharge time is 100 seconds with an interval of 3 seconds;

[0076] Formation step b:

[0077] 1) Assembling the nickel-cobalt lithium manganese oxide posit...

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Abstract

The invention provides a formation method of a lithium ion battery with a nickel cobalt lithium manganate positive electrode. The method disclosed by the invention comprises a step a of pre-embeddinglithium into a carbon negative electrode and a step b of forming the lithium ion battery after assembling the battery. By the formation steps of the invention, the quantity of migrated lithium betweenthe positive electrode and the negative electrode can be increased, and the quantity of the lost lithium ions for forming an SEI film can be compensated, so that the rate capability of the battery isimproved. Moreover, through the formation step b, by controlling the formation processes, the stable SEI film can be formed, so that the circularity of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries with nickel-cobalt lithium manganese oxide positive electrodes, in particular to a method for forming lithium ion batteries with nickel-cobalt lithium manganese oxide positive electrodes. Background technique [0002] Lithium-ion batteries with nickel-cobalt lithium manganese oxide positive electrodes have high energy density, high charge and discharge platform, and high power density. They are one of the main materials for power lithium-ion batteries. The lithium-ion battery formation process with nickel-cobalt lithium manganese oxide positive electrode is a very important process in the production of lithium-ion batteries with nickel-cobalt lithium manganese oxide positive electrode. During formation, the solvent and lithium salt in the electrolyte will generate SEI on the electrode surface An interface film, which can prevent the side reaction between the solvent and the active ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M4/505H01M4/525H01M4/583H01M10/0525
CPCH01M4/505H01M4/525H01M4/583H01M10/0525H01M10/446Y02E60/10
Inventor 钱起许明发
Owner 泰州纳新新能源科技有限公司
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