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Lithium-supplementing negative pole piece and preparation method thereof and lithium ion battery

A negative electrode pole piece, lithium ion technology, applied in the lithium supplement negative pole piece and its preparation, lithium ion battery field

Inactive Publication Date: 2021-04-02
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of the coulombic efficiency of the first charge and discharge of the silicon-carbon negative electrode, the present invention proposes a lithium-replenishing negative electrode plate and its preparation method and a lithium-ion battery, which can realize the uniform and precise lithium replenishment of the silicon-carbon negative electrode, and improve the battery’s initial charge-discharge efficiency and Energy density, while improving the conductivity of the silicon carbon negative electrode sheet

Method used

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  • Lithium-supplementing negative pole piece and preparation method thereof and lithium ion battery
  • Lithium-supplementing negative pole piece and preparation method thereof and lithium ion battery
  • Lithium-supplementing negative pole piece and preparation method thereof and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Negative electrode active material (a mixture of graphite and silicon, capacity C 负 =500mAh g -1 , first coulombic efficiency ICE=80%), pre-lithiated design capacity C 设 It is 90% of the irreversible capacity of the silicon-carbon negative electrode, and the surface density of the pole piece ρ 负面 = 20 mg cm -2 , pole piece area S 负面 =82cm 2 , the specific capacity of metal lithium powder is C Li =3600mAh g -1 , the mass M of lithium metal powder required can be accurately calculated according to the amount of lithium supplemented in the negative electrode Li = ρ 负面 *S 负面 *C 负 *(100%-ICE)*90% / C Li , namely M Li = 20 mg cm -2 *82cm 2 *500mAhg -1 *(100%-80%)*90% / 3600mAh g -1 = 41 mg;

[0035] (2) According to the ratio of metal lithium powder 96.5%, electronic good conductor and lithium ion good conductor compound 2% (1% electronic good conductor, 1% lithium ion good conductor) and binder 1.5%, prepare lithium supplement slurry, Mix 41mg of lithium met...

Embodiment 2

[0041] (1) Negative electrode active material (a mixture of graphite and silicon, capacity C 负 =500mAh g -1 , first coulombic efficiency ICE=80%), pre-lithiated design capacity C 设 It is 100% of the irreversible capacity of the silicon carbon negative electrode, and the surface density ρ of the pole piece 负面 = 20 mg cm -2 , pole piece area S 负面 =82cm 2 , the specific capacity of metal lithium powder is C Li =3600mAh g -1 , the mass M of lithium metal powder required can be accurately calculated according to the amount of lithium supplemented in the negative electrode Li = ρ 负面 *S 负面 *C 负 *(100%-ICE)*100% / C Li , namely M Li = 20 mg cm -2 *82cm 2 *500mAh g -1 *(100%-80%)*100% / 3600mAh g -1 = 45.5 mg;

[0042] (2) According to the ratio of metal lithium powder 96.5%, electronic good conductor and lithium ion good conductor compound 2% (1% electronic good conductor, 1% lithium ion good conductor) and binder 1.5%, prepare lithium supplement slurry, Mix 45.5mg of lit...

Embodiment 3

[0048] (1) Negative electrode active material (a mixture of graphite and silicon, capacity C 负 =500mAh g -1 , first coulombic efficiency ICE=80%), pre-lithiated design capacity C 设 It is 100% of the irreversible capacity of the silicon carbon negative electrode, and the surface density ρ of the pole piece 负面 = 20 mg cm -2 , pole piece area S 负面 =82cm 2 , the specific capacity of metal lithium powder is C Li =3600mAh g -1 , the mass M of lithium metal powder required can be accurately calculated according to the amount of lithium supplemented in the negative electrode Li = ρ 负面 *S 负面 *C 负 *(100%-ICE)*100% / C Li , namely M Li = 20 mg cm -2 *82cm 2 *500mAh g -1 *(100%-80%)*100% / 3600mAh g -1 = 45.5 mg;

[0049] (2) According to the ratio of 95% lithium metal powder, good electron conductor and lithium ion good conductor compound 3% (2% electron good conductor, 1% lithium ion good conductor) and binder 2%, the lithium supplement slurry is prepared, Mix 45.5mg of lit...

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Abstract

The invention provides a lithium supplementing negative pole piece, which comprises a porous current collector, lithium supplementing coatings respectively positioned on the upper surface and the lower surface of the porous current collector, and an active substance layer positioned on the surfaces of the lithium supplementing coatings, wherein the through holes of the porous current collector arefurther filled with the lithium supplementing coatings, and the lithium supplementing coating comprises the following components in percentage by mass: 90-98% of metal lithium powder, 1-5% of a mixture of an electronic good conductor and a lithium ion good conductor and 1-5% of a binder. According to the invention, uniform and accurate lithium supplement of the silicon-carbon negative electrode can be realized, the first charge-discharge efficiency and the energy density of the battery are improved, and the conductivity of the silicon-carbon negative electrode piece is improved.

Description

technical field [0001] The invention belongs to the field of lithium supplementation for lithium batteries, and in particular relates to a lithium supplementation negative pole piece, a preparation method thereof and a lithium ion battery. Background technique [0002] In the prior art, in the patent CN102610861A, the metal lithium strip is directly pressed on the surface of the negative electrode sheet, and under the infiltration of the electrolyte, the lithium strip is used as the negative electrode sheet for lithium supplementation, which reduces the irreversible capacity loss of the first charge and improves the energy density of the battery . The solid copper and aluminum foil used in the current collector needs to be compounded with lithium sheets on the surface of each negative electrode sheet. Currently, the lithium strips on the market are relatively thick. Due to the soft texture of lithium metal, the lithium strips are rolled into lithium foils. In order to ensure...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M4/80H01M10/42H01M10/0525
CPCH01M4/134H01M4/1395H01M4/0404H01M4/80H01M10/4242H01M10/0525H01M2004/027H01M4/0416H01M4/133H01M4/1393H01M4/587H01M4/661H01M4/70H01M10/058
Inventor 张进李亚东高秀玲崔雪红
Owner TIANJIN ENERGIES
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