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Silicon monoxide negative pole piece pre-lithiation method

A negative pole piece and silicon oxide technology, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of unfavorable large-scale commercialization, poor economic benefits, high equipment requirements, etc., and achieve the pre-lithiation time Short, easy to operate, high economic value effect

Inactive Publication Date: 2020-06-09
SHANGHAI ELECTRICGROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preconditioning process, high-temperature hot-melt coating is used to obtain preconditioned lithium battery negative electrode materials. The process is complicated, the equipment requirements are high, and the economic benefits are poor, which is not conducive to large-scale commercialization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for pre-lithiation of a silicon oxide negative electrode sheet, comprising the steps of:

[0034] S1: Put 2g of naphthalene in 50mL of tetrahydrofuran, shake to dissolve, then add 10g of lithium tablets, shake vigorously for 5-10min to dissolve until the solution develops color, and stand for 12-24h to obtain the pre-lithiation reagent;

[0035] S2: absorb the obtained pre-lithiation test with a straw, and add it dropwise to the prepared silicon oxide negative electrode sheet;

[0036] S3: drying the silicon oxide negative pole piece in a muffle furnace at a temperature of 100° C. for 5 minutes, that is, to realize the preconditioning of the pole piece.

Embodiment 2

[0038] A method for pre-lithiation of a silicon oxide negative electrode sheet, comprising the steps of:

[0039] S1: Put 2g of biphenyl in 50mL of tetrahydrofuran, shake to dissolve, then add 10g of lithium tablet, shake vigorously for 5-10min to dissolve until the solution develops color, and let stand for 12-24h to obtain the pre-lithiation reagent;

[0040] S2: absorb the obtained pre-lithiation test with a straw, and add it dropwise to the prepared silicon oxide negative electrode sheet;

[0041] S3: drying the silicon oxide negative pole piece in a muffle furnace at a temperature of 100° C. for 5 minutes, that is, to realize the preconditioning of the pole piece.

Embodiment 3

[0043] A method for pre-lithiation of a silicon oxide negative electrode sheet, comprising the steps of:

[0044] S1: Put 3g of biphenyl in 80mL of ethylene glycol dimethyl ether, shake to dissolve it, then add 12g of lithium tablets, shake vigorously for 5-10min to dissolve until the solution develops color, and let stand for 12-24h to obtain the pre-lithiation reagent;

[0045] S2: absorb the obtained pre-lithiation test with a straw, and add it dropwise to the prepared silicon oxide negative electrode sheet;

[0046] S3: drying the silicon oxide negative pole piece in a muffle furnace at a temperature of 100° C. for 5 minutes, that is, to realize the preconditioning of the pole piece.

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PUM

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Abstract

The invention discloses a silicon monoxide negative pole piece pre-lithiation method, which comprises the steps of S1, putting weighed aromatic organic matters into a certain amount of organic solvent, oscillating to dissolve the aromatic organic matters, adding a weighed lithium sheet, oscillating to dissolve the lithium sheet until a solution develops color, and standing to obtain a pre-lithiation reagent; S2, dropwise adding the pre-lithiation reagent obtained in the step S1 onto a prepared silicon monoxide negative pole piece; and S3, drying the silicon monoxide negative pole piece to realize the pre-physicochemical treatment of the pole piece. According to the pre-lithiation method disclosed by the invention, the initial Coulombic efficiency of the silicon monoxide material can be improved from 64% to 75-80%; and the method is simple and convenient to operate, short in pre-lithiation time, low in equipment requirement and high in economic value, and can be popularized on a large scale.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium batteries, in particular to a method for pre-lithiation of silicon oxide negative pole pieces. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, no pollution, no memory effect, and long life. They are widely used in portable electrical devices such as mobile phones, digital cameras, and notebook computers. At the same time, they are used as an alternative energy source for petroleum in electric vehicles. And hybrid vehicles will also be applied on a large scale. Silicon anode has a large lithium storage capacity and is abundant in the earth, making it an ideal anode material for lithium-ion batteries. [0003] Patent CN108417814A provides an organic lithium salt pre-lithiated lithium battery negative electrode material and its preparation method. The lithium-rich organic matter is obtained by re...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M10/0525
CPCH01M4/1391H01M10/0525Y02E60/10
Inventor 万玲玉周兰陈福平曾乐才黄奔
Owner SHANGHAI ELECTRICGROUP CORP