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Pre-lithiated negative electrode material as well as preparation method and application thereof

A negative electrode material and pre-lithiation technology, which is applied in the field of pre-lithiation negative electrode materials and its preparation, can solve the problems of uncertain influence on battery stability, increased pre-lithiation cost, and reduced pre-lithiation efficiency

Inactive Publication Date: 2020-08-25
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above technical solutions, additional elements will be introduced during the pre-lithiation process, which will have an uncertain impact on the stability of the battery
Pre-lithiation in the electrolyte will increase the cost of pre-lithiation, and the way of applying external voltage will reduce the efficiency of pre-lithiation, which is not convenient for large-scale production and application
Therefore, the existing methods for preparing pre-lithiated anode materials still need to be improved

Method used

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  • Pre-lithiated negative electrode material as well as preparation method and application thereof
  • Pre-lithiated negative electrode material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Dissolving 1g of metal lithium element into 100g of polyaniline to obtain lithium element solution;

[0048] (2) Disperse 50g of silicon-carbon negative electrode material in 500g of ethanol under stirring conditions to obtain a negative electrode material dispersion;

[0049] (3) With a flow rate of 10g / min, the above-mentioned lithium elemental solution is added dropwise to the negative electrode material dispersion to obtain a mixed solution;

[0050] (4) Vacuum drying the above mixed solution to obtain a pre-lithiated silicon carbon negative electrode material.

Embodiment 2

[0052] (1) Dissolving 1g of metallic lithium elemental substance in 500g of toluene to obtain lithium elemental substance solution;

[0053] (2) Disperse 50g of silicon-carbon negative electrode material in 500g of ethylene glycol under stirring conditions to obtain a negative electrode material dispersion;

[0054] (3) With a flow rate of 10g / min, the above-mentioned lithium elemental solution is added dropwise to the negative electrode material dispersion to obtain a mixed solution;

[0055] (4) Vacuum drying the above mixed solution to obtain a pre-lithiated silicon carbon negative electrode material.

Embodiment 3

[0057] (1) Dissolving 1g of metallic lithium elemental substance in 100g of ethylene glycol to obtain lithium elemental substance solution;

[0058] (2) Disperse 100g of silicon-carbon negative electrode material into 500g of biphenyl under stirring conditions to obtain a negative electrode material dispersion;

[0059] (3) With a flow rate of 10g / min, the above-mentioned lithium elemental solution is added dropwise to the negative electrode material dispersion to obtain a mixed solution;

[0060] (4) Vacuum drying the above mixed solution to obtain a pre-lithiated silicon carbon negative electrode material.

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Abstract

The invention discloses a pre-lithiated negative electrode material and a preparation method thereof. The method for preparing the pre-lithiated negative electrode material comprises the following steps: mixing a lithium elementary substance with a first solvent to obtain a lithium elementary substance solution; mixing a negative electrode material with a second solvent to obtain a negative electrode material dispersion liquid; adding the lithium elementary substance solution into the negative electrode material dispersion liquid to obtain a mixed solution; and carrying out vacuum drying on the mixed solution to obtain the pre-lithiated negative electrode material. According to the method, the lithium elementary substance solution is in full and uniform contact with the negative electrodematerial dispersion liquid, and the lithium elementary substance can be uniformly separated out of the negative electrode material in an extraction manner, so that the pre-lithiation of the negative electrode material is realized.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular, the invention relates to a pre-lithiated negative electrode material and a preparation method and application thereof. Background technique [0002] As new energy becomes more and more popular in daily life, new energy battery materials account for an increasing proportion of modern industrial production. On the one hand, the improvement of battery performance is inseparable from the positive electrode material with excellent performance, on the other hand, the negative electrode material also ultimately restricts the overall performance of the battery. At present, artificial graphite is the mainstream anode material. Power batteries with high performance and long battery life put forward higher requirements for anode materials. Traditional artificial graphite shows many shortcomings under the new era of battery technology. With the maturity of high-end battery technolog...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/587H01M10/0525
CPCH01M4/362H01M4/382H01M4/483H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 于刘涛齐士博吕豪杰吴光麟
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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