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Formation method of polymer lithium-ion battery with lithium nickel cobalt manganese oxide cathode

A technology of lithium ion battery and lithium nickel cobalt manganese oxide, applied in the field of lithium ion battery manufacturing, can solve the problems of incapable of fully exerting the capacity and cycle performance of lithium ion battery, poor structure of SEI film, and high consumption of lithium ions, etc. Reduce the occurrence of side reactions, stable and compact structure, and promote the effect of exertion

Inactive Publication Date: 2018-03-09
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing flexible packaging lithium-ion battery formation method is generally carried out at room temperature, the first charge will be charged to the cut-off voltage, the structure of the SEI film produced is poor, and more lithium ions are consumed, which cannot improve the capacity and cycle of lithium-ion batteries. Performance is fully exploited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for forming a soft pack lithium-ion battery of a nickel-cobalt lithium manganese oxide material positive electrode, comprising the following steps:

[0021] a) In a low temperature environment of 0°C, charge the soft-pack lithium-ion battery soaked in the electrolyte to 3.0V at a charge rate of 0.1C, and then charge it to 3.6V at a charge rate of 0.1C. After standing still, charge it at a rate of 0.2 The discharge rate of C is discharged to 2.5V;

[0022] b) Pressurize the surface of the soft-pack lithium-ion battery and perform air extraction;

[0023] c) Put the pouch lithium-ion battery after air extraction treatment in a high temperature environment of 35°C for 24 hours;

[0024] d) Charge the pouch lithium-ion battery treated in step c to 3.6V at a charging rate of 0.2C, and then charge to 4.1V at a charging rate of 0.4C.

Embodiment 2

[0026] A method for forming a soft pack lithium-ion battery of a nickel-cobalt lithium manganese oxide material positive electrode, comprising the following steps:

[0027] a) In a low temperature environment of 5°C, charge the soft-pack lithium-ion battery soaked in the electrolyte to 3.0V at a charge rate of 0.1C, and then charge it to 3.6V at a charge rate of 0.2C. After standing still, charge it at a rate of 0.2 The discharge rate of C is discharged to 2.6V;

[0028] b) Pressurize the surface of the soft-pack lithium-ion battery and perform air extraction;

[0029] c) The soft-pack lithium-ion battery after the air extraction treatment is placed in a high-temperature environment of 40°C for 40 hours;

[0030] d) Charge the soft-pack lithium-ion battery treated in step c to 3.6V at a charging rate of 0.2C, and then charge to 4.2V at a charging rate of 0.5C.

Embodiment 3

[0032] A method for forming a soft pack lithium-ion battery of a nickel-cobalt lithium manganese oxide material positive electrode, comprising the following steps:

[0033] a) In a low temperature environment of 15°C, charge the soft-pack lithium-ion battery soaked in the electrolyte to 3.0V at a charge rate of 0.1C, and then charge it to 3.7V at a charge rate of 0.2C. After standing still, charge it at a rate of 0.3 The discharge rate of C is discharged to 2.6V;

[0034] b) Pressurize the surface of the soft-pack lithium-ion battery and perform air extraction;

[0035] c) The soft-pack lithium-ion battery after air extraction treatment was left to stand at a high temperature of 40°C for 56 hours;

[0036] d) Charge the pouch lithium-ion battery treated in step c to 3.7V at a charging rate of 0.3C, and then charge to 4.2V at a charging rate of 0.5C.

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Abstract

A formation method of a polymer lithium-ion battery with a lithium nickel cobalt manganese oxide cathode relates to the technical field of lithium-ion battery manufacturing and comprises the specificsteps of low-temperature low-rate charging and discharging, pressurized venting, standing, high-rate charging and discharging and the like. The formation method of the polymer lithium-ion battery withthe lithium nickel cobalt manganese oxide cathode according to the invention has the advantages that SEI (solid electrolyte interface) film structure generated has better stability and compactness, lithium ion consumption is reduced, the cycle performance of the polymer lithium-ion battery with the lithium nickel cobalt manganese oxide cathode is improved, the capacity of the battery is given tobetter play, and self-discharge of the battery is weakened.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery manufacturing, in particular to a method for forming a soft-pack lithium-ion battery with a nickel-cobalt-lithium-manganese-oxide positive electrode. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of high energy density, long cycle life, high open circuit voltage, no memory effect, safety and no pollution. After more than 20 years of rapid development, lithium-ion batteries are widely used in notebook computers, mobile phones, digital cameras, energy storage and other fields. In recent years, with the strengthening of people's awareness of environmental protection, the environmental pollution and global warming caused by automobile exhaust have attracted widespread attention. With the energy crisis caused by dwindling resources, the research, development and industrialization of energy-saving and environment-friendly electric veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/44
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 赵星星杜小红苏文俊李凡群
Owner WANXIANG 123 CO LTD
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