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Pre-lithiated silicon-based negative electrode plate as well as preparation method and application thereof

A technology of pre-lithiated silicon base and negative pole piece, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of unstable SEI formation

Inactive Publication Date: 2021-09-07
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the obtained pre-lithiated silicon-based negative electrode sheet is made into a lithium-ion battery, it can effectively reduce the consumption of electrolyte and effective Li in the battery, and can also reduce the amount of electrolyte injection required for the production of lithium-ion batteries and the working time of lithium-ion batteries. Gas generation, thereby simplifying the production process and formation process of lithium-ion batteries, and solving the problem of unstable SEI formation in conventional lithium batteries

Method used

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  • Pre-lithiated silicon-based negative electrode plate as well as preparation method and application thereof
  • Pre-lithiated silicon-based negative electrode plate as well as preparation method and application thereof

Examples

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Embodiment 1

[0058] This embodiment provides a pre-lithiated silicon-based negative electrode sheet, and the preparation method of the pre-lithiated silicon-based negative electrode sheet is as follows:

[0059] (1) Mix silicon oxide and graphite at a ratio of 1:10 to make a negative electrode material with a specific capacity of 464mAh / g, and mix the negative electrode active material, conductive agent SP, and binder at a mass ratio of 80:12:8 , add an appropriate amount of deionized water, apply the mixed slurry on the upper surface of the copper foil and dry it. The electrode surface density is 20mg / cm 2 , the compacted density is 1.6g / cm 3; Micropores are formed on the surface of the silicon-oxygen inorganic sheet by laser etching, the opening size of the micropores is 20 μm, the depth is 100 μm, and the spacing between the micropores is 200 μm;

[0060] (2) In the glove box, make a Li-4,4'-DMBP complex with a concentration of 1.0mol / L as a chemical pre-lithiation reagent;

[0061] ...

Embodiment 2

[0063] This embodiment provides a pre-lithiated silicon-based negative electrode sheet, and the preparation method of the pre-lithiated silicon-based negative electrode sheet is as follows:

[0064] (1) Mix silicon oxide and graphite at a ratio of 1:10 to make a negative electrode material with a specific capacity of 464mAh / g, and mix the negative electrode active material, conductive agent SP, and binder at a mass ratio of 80:12:8 , add an appropriate amount of deionized water, apply the mixed slurry on the upper surface of the copper foil and dry it. The surface density of pole piece is 8mg / cm 2 , the compacted density is 1.6g / cm 3 ; Micropores are formed on the surface of the silicon-oxygen inorganic sheet by laser etching, the opening diameter of the micropores is 25 μm, the depth is 120 μm, and the spacing between the micropores is 300 μm;

[0065] (2) In the glove box, make a Li-4,4'-DMBP complex with a concentration of 1.0mol / L as a pre-lithiation reagent;

[0066] (...

Embodiment 3

[0068] The only difference between this embodiment and embodiment 1 is that the areal density of the pole piece described in step (1) is 25 mg / cm 2 , other conditions and parameters are exactly the same as in Example 1.

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Abstract

The invention provides a pre-lithiated silicon-based negative electrode plate and a preparation method and application thereof. The preparation method comprises the following steps of: (1) mixing a silicon-based negative electrode material, a conductive agent and a binder, coating a current collector with the mixture to obtain a silicon-based negative electrode plate, and arranging a micro-porous structure on the surface of the silicon-based negative electrode plate; (2) mixing lithium metal, aromatic hydrocarbon and an organic solvent to obtain a Li-aromatic hydrocarbon compound; and (3) carrying out pre-lithiation on the silicon-based negative electrode plate with a micro-porous structure obtained in the step (1) by using the Li-aromatic compound obtained in the step (2), and carrying out post-treatment to obtain the pre-lithiated silicon-based negative electrode plate. According to the pre-lithiated negative electrode plate prepared by the method disclosed by the invention, the initial coulombic efficiency of the negative electrode of a battery can be improved while the high specific capacity of the negative electrode is ensured, and the electrochemical performance of the battery is also improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a pre-lithiated silicon-based negative pole piece and a preparation method and application thereof. Background technique [0002] Due to the frequent mileage anxiety in the experience of using electric vehicles in the current consumer market, the research and development of power batteries is increasingly developing in the direction of high energy density and fast charging. However, high energy density and fast charging are two research and development directions, and thick electrodes required by high energy density are fatal to fast charging. On the other hand, the energy density of fast-charging batteries achieved by reducing areal density and compaction density is low, which is an unacceptable result for the electric vehicle consumer market. If the current negative electrode material is changed from simply using graphite to using silicon-based materials and graphite composi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/48H01M4/62H01M10/0525
CPCH01M4/483H01M4/13H01M4/139H01M4/625H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 邱昭政梁世硕李文龙赵育松
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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