A pre-lithiation treatment process and device for a silicon-based negative electrode

A technology of silicon-based negative electrode and processing technology, which is applied in the field of lithium-ion batteries, can solve the problems of low initial charge and discharge efficiency of silicon-carbon negative electrodes, and achieve the effects of improving initial charge and discharge efficiency, avoiding precipitation, and eliminating potential safety hazards

Active Publication Date: 2018-02-13
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of low initial charge and discharge efficiency of silicon-carbon negative electrodes of lithium-ion batteries, we have proposed a pre-lithiation treatment process and device for silicon-based negative electrodes. The present invention can effectively improve the initial charge-discharge efficiency of silicon-carbon negative electrodes, which can improve Cycle life of silicon carbon anode

Method used

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  • A pre-lithiation treatment process and device for a silicon-based negative electrode

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Embodiment 1

[0031] A pre-lithiation treatment device for a silicon-based negative electrode, comprising an electrolytic cell 1, a working electrode 2, a counter electrode 3 and a wire 4, wherein the working electrode 2 (silicon-based negative electrode) is vertically located in the middle of the electrolytic cell 1, and the left side is connected to the side of the electrolytic cell The upper side is connected to the wire 4; the counter electrode 3 (metal lithium sheet) is two pieces, which are respectively vertically attached to the front and rear walls of the electrolyte, the right side is attached to the side wall of the electrolytic tank, and the upper side is connected to the same wire. Wire 4 is connected.

[0032] A pre-lithiation treatment process for a silicon-based negative electrode, the steps are as follows:

[0033] (1) Homogenize 650mAh / g silicon carbon powder, conductive agent SP, hydroxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) according to the mass ratio o...

Embodiment 2

[0045] A pre-lithiation treatment device for a silicon-based negative electrode, the structure of which is basically the same as that of Example 1.

[0046] A pre-lithiation treatment process for a silicon-based negative electrode, the steps are as follows:

[0047] (1) Homogenize 650mAh / g silicon carbon powder, conductive agent SP, hydroxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) according to the mass ratio of 90:5:5:5. Coating on copper foil, one side coating surface density is 2mg / cm 2 , made of silicon-based negative electrode;

[0048] (2) In a glove box where the water vapor content is controlled to be less than 1ppm and the oxygen content is less than 1ppm, use an electrolysis device equipped with a lithium-intercalated electrolyte, use a metal lithium sheet as a counter electrode, and a silicon-based negative electrode as a working electrode. Electrodeposit lithium metal;

[0049] (3) Electrodeposition of lithium metal: In lithium intercalation elect...

Embodiment 3

[0059] A pre-lithiation treatment device for a silicon-based negative electrode, the structure of which is basically the same as that of Example 1.

[0060] A pre-lithiation treatment process for a silicon-based negative electrode, the steps are as follows:

[0061] (1) Homogenize 650mAh / g silicon carbon powder, conductive agent SP, hydroxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) according to the mass ratio of 90:5:1:1. Coating on copper foil, one side coating surface density is 2mg / cm 2 , made of silicon-based negative electrode;

[0062] (2) In a glove box where the water vapor content is controlled to be less than 1ppm and the oxygen content is less than 1ppm, use an electrolysis device equipped with a lithium-intercalated electrolyte, use a metal lithium sheet as a counter electrode, and a silicon-based negative electrode as a working electrode. Electrodeposit lithium metal;

[0063] (3) Electrodeposition of lithium metal: In lithium intercalation elect...

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Abstract

The invention provides a silicon-based negative electrode pre-lithiation treatment process, including homogenization, coating, two-step constant current pulse deposition method electrodeposition lithium metal, DMC soaking, drying and other steps, the invention also provides a silicon-based The pre-lithiation treatment device of the negative electrode includes an electrolytic cell, a working electrode, a counter electrode and a wire, wherein the counter electrode is two pieces. The invention can effectively improve the first charge and discharge efficiency of the silicon-carbon negative electrode, and can improve the cycle life of the silicon-carbon negative electrode.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a pre-lithiation treatment process and device for a silicon-based negative electrode. Background technique [0002] Silicon is the anode material with the highest theoretical lithium storage capacity (Li 22 Si 5 , 4200mAh / g), its specific capacity is much higher than the current commercialized graphite anode material. The lithium intercalation potential of silicon is between 0-0.4V, and the voltage platform of silicon is very stable at the first discharge, which is due to the two-phase transition from crystalline silicon to amorphous silicon in the first discharge of silicon. In the subsequent cycles, the silicon has maintained an amorphous structure, so the voltage plateau is also different from the first time. [0003] However, under the condition of high intercalation / delithiation of silicon anode materials, there is a serious volume effect, which will lead to the colla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/1393H01M10/058
CPCY02E60/10Y02P70/50
Inventor 石先兴王慧敏冯筱峰严红吕豪杰陈瑶
Owner WANXIANG 123 CO LTD
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