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Negative pole piece and preparation method thereof, soft pack lithium-ion battery and preparation method thereof

A technology for lithium-ion batteries and negative pole pieces, which is applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve problems such as easy excessive lithiation and lithium analysis, achieve saving processing costs, reduce the probability of lithium analysis, and eliminate The effect of the lithium ion concentration gradient difference

Active Publication Date: 2022-02-25
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the present invention aims to propose a negative pole piece and a preparation method thereof, a soft-packed lithium-ion battery and a preparation method thereof, so as to solve the problem that the existing pre-lithiation method is prone to excessive lithiation and lithium precipitation occurs

Method used

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  • Negative pole piece and preparation method thereof, soft pack lithium-ion battery and preparation method thereof

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preparation example Construction

[0051] A preparation method for a soft pack lithium-ion battery, comprising the steps of:

[0052] (1) Preparation of the negative electrode sheet to be pre-lithiated: apply the silicon-carbon negative electrode slurry to the front and back surfaces of the negative electrode current collector, dry and then perform rolling to obtain the negative electrode sheet to be pre-lithiated.

[0053] (2) Pre-lithiation capacity design: Calculate the pre-lithiation capacity according to the irreversible capacity of the silicon-carbon anode, calculate the parameters of the porous lithium foil according to the obtained pre-lithiation capacity, and prepare the porous lithium foil.

[0054] Wherein, the shape of the porous lithium foil is circular, elliptical, rhombus, triangular, quadrangular or pentagonal, etc., and the preparation method of the pores of the porous lithium foil is piercing, pressing, corrosion, electrolysis or electroplating, etc. . The thickness of the porous lithium foil...

Embodiment 1

[0081] A preparation method for a soft pack lithium-ion battery, comprising the steps of:

[0082] Preparation of the negative electrode sheet to be pre-lithiated: the mixture of the negative electrode active material graphite and silicon (capacity C 负 =500mAh g -1 , the first Coulombic efficiency ICE=80%), the conductive agent Super P, the binder SBR and the thickener CMC are mixed according to the ratio of 90:4:3:3 to make a slurry, and the slurry is coated on a porous copper foil The positive and negative sides of the formed negative electrode current collector are dried, rolled, and cut to obtain a negative electrode sheet, and the surface density of the negative electrode sheet is ρ 负面 = 20 mg cm -2 , the area of ​​the negative pole piece S 负面 =82cm 2 .

[0083] Pre-lithiation capacity design: pre-lithiation capacity C 设 It is designed to be 90% of the irreversible capacity of the silicon carbon negative electrode, and there is one negative electrode piece, C 设 = ρ...

Embodiment 2

[0091] A preparation method for a soft pack lithium-ion battery, comprising the steps of:

[0092] Preparation of the negative electrode sheet to be pre-lithiated: the mixture of the negative electrode active material graphite and silicon (capacity C 负 =500mAh g -1, the first Coulombic efficiency ICE=80%), the conductive agent Super P, the binder SBR and the thickener CMC are mixed according to the ratio of 90:4:3:3 to make a slurry, and the slurry is coated on a porous copper foil The positive and negative sides of the formed negative electrode current collector are dried, rolled, and cut to obtain a negative electrode sheet, and the surface density of the negative electrode sheet is ρ 负面 = 20 mg cm -2 , the area of ​​the negative pole piece S 负面 =82cm 2 .

[0093] Pre-lithiation capacity design: pre-lithiation capacity C 设 It is designed to be 90% of the irreversible capacity of the silicon carbon negative electrode, and there is one negative electrode piece, C 设 = ρ ...

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Abstract

The invention provides a negative pole piece and a preparation method thereof, a soft-packed lithium-ion battery and a preparation method thereof, wherein the negative pole piece includes at least one composite negative pole piece, and the composite negative pole piece includes a silicon carbon negative pole piece and The porous lithium foil is press-bonded on at least one surface of the silicon-carbon negative electrode sheet. The present invention uses a lithium foil with a porous structure for pre-lithiation, and can accurately control the use of the lithium foil according to the required pre-lithiation capacity, greatly reducing the probability of lithium precipitation due to excessive lithiation of the silicon-carbon negative electrode.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a negative pole piece and a preparation method thereof, a soft-pack lithium ion battery and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, the contradiction between the growing economic development and the energy environment has become more and more acute. The traditional automobile technology using fossil energy has gradually failed to meet the requirements of people's environmental protection in the new century. Diversification of clean energy sources. Vigorously developing new energy vehicles is a concentrated expression of the implementation of new development concepts. It is not only an inevitable choice to effectively deal with energy and environmental challenges and realize the sustainable development of China's auto industry, but also the only way for my country to move from a big car country ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/66H01M4/80H01M10/0525H01M10/0585
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/661H01M4/80H01M10/0525H01M10/0585H01M2004/027Y02E60/10Y02P70/50
Inventor 张进高秀玲李文文从长杰王驰伟
Owner TIANJIN ENERGIES
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