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Method for pre-lithiation of cathode pole piece of lithium ion battery

A lithium-ion battery and negative pole piece technology, which is applied in battery electrodes, secondary batteries, secondary battery charging/discharging, etc., can solve the problems of first-time coulombic efficiency reduction, total energy density reduction, battery application barriers, etc., and achieve cost Low, improved safety, uniform lithiation effect

Inactive Publication Date: 2017-12-12
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solid polymer electrolyte membrane is beneficial to the cycle stability of the lithium-ion battery, the part of the lithium ions used to generate the solid polymer electrolyte membrane is irreversible, thus causing a decrease in the first coulombic efficiency (ICE) of the battery and reducing the battery's performance. capacity
In practical applications, the poor ICE of the negative electrode will pose a huge obstacle to the application of batteries, because the poor ICE requires additional positive active material for the first cycle alone, resulting in a decrease in the overall energy density.

Method used

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  • Method for pre-lithiation of cathode pole piece of lithium ion battery
  • Method for pre-lithiation of cathode pole piece of lithium ion battery

Examples

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Effect test

Embodiment 1

[0028] A method for pre-lithiation of the negative pole piece of lithium ion battery, comprising the following steps: forming an external short circuit between the positive and negative poles of the button battery.

Embodiment 2

[0030] A method for pre-lithiation of lithium-ion battery negative pole piece, comprising the steps of: forming an external short circuit between the positive and negative poles of a button cell;

[0031] Wherein, the external short-circuit circuit includes a variable resistor and a voltmeter;

[0032] After forming an external short-circuit circuit between the positive and negative poles of the button battery, keep the short-circuit state for 0.5h;

[0033] The resistance range of the variable resistor is 10-1000Ohm;

[0034] The range of the voltmeter is 0-7V;

[0035] The preparation method of the button battery is as follows: in an atmosphere with a water value<0.1p.p.m and an oxygen value<3p.p.m, sequentially put a negative electrode sheet, an electrolyte, a diaphragm, a positive electrode lithium foil, a gasket, and a spring sheet in the positive electrode shell and the negative electrode case, seal on the sealing machine;

[0036] The preparation method of the negati...

Embodiment 3

[0041] A method for pre-lithiation of lithium-ion battery negative pole piece, comprising the steps of: forming an external short circuit between the positive and negative poles of a button cell;

[0042] Wherein, the external short-circuit circuit includes a variable resistor and a voltmeter;

[0043] After forming an external short-circuit circuit between the positive and negative poles of the button battery, keep the short-circuit state for 1h;

[0044] The resistance range of the variable resistor is 10-1000Ohm;

[0045] The range of the voltmeter is 0-7V;

[0046] The preparation method of the button battery is as follows: in an atmosphere with a water value<0.1p.p.m and an oxygen value<3p.p.m, sequentially put a negative electrode sheet, an electrolyte, a diaphragm, a positive electrode lithium foil, a gasket, and a spring sheet in the positive electrode shell and the negative electrode case, seal on the sealing machine;

[0047] The preparation method of the negative...

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Abstract

The invention discloses a method for pre-lithiation of a cathode pole piece of a lithium ion battery. The method comprises the step of forming an external short-circuited circuit between the anode and the cathode of a button battery. According to the invention, a solid polymer electrolyte film is formed on a cathode surface in advance in the manner of pre-lithiation, so that the lithium ion consumed in the process of firstly charging the whole battery can be avoided and the first coulombic efficiency of the battery is increased.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for pre-lithiation of lithium-ion battery negative pole pieces. Background technique [0002] Energy is an important basis for human survival and the sound development of society. With the advancement of science and technology, the development of electric vehicles (EV), aerospace, mobile communications, national defense technology, new energy power generation (wind energy, solar energy, etc.) and new electromagnetic weapons, The demand for power supplies for high-performance storage devices is becoming more and more urgent. Especially in EV applications, higher energy density means increased driving range per charge, which is crucial for the widespread spread of lithium-ion batteries in the global market. [0003] During the first charging process of the battery, part of the lithium ions deintercalated from the positive electrode are embedded in the lattice of the n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M10/0525H01M10/44
CPCH01M4/139H01M10/0525H01M10/446Y02E60/10
Inventor 朱亮王林
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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