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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, applied in the field of pre-lithiation negative electrode material and its preparation, can solve problems such as high alkalinity, and achieve the effects of lowering pH value, high degree of operability, and excellent first Coulomb efficiency

Active Publication Date: 2022-07-05
浙江锂宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problems existing in the prior art, the present invention discloses a method for preparing a pre-lithiated negative electrode material, which solves the problem of high alkalinity of traditional pre-lithiated silicon-oxygen materials

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

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1) In a dry environment, the lithium powder is added to the triphenylmethane solution with a concentration of 1 mol / L and mixed uniformly by a magnetic stirrer, wherein the mass ratio of the lithium powder to the mixed solution is 1:5; Lithium tetrafluoroborate is fully mixed and uniform, and the mass ratio of lithium tetrafluoroborate to the solution after mixing is 2%. The mixed solution is spray-dried to obtain a lithium-containing powder as a pre-lithium reagent.

[0031] 2) Put the above powder, silicon oxide powder and binder phenolic resin into a ball mill according to a mass ratio of 25:70:5, and then take it out after ball milling for 1.5 hours to obtain a mixed powder material.

[0032] 3) Get 3kg of the above mixed powder material, place it in a vacuum furnace and roast under an argon atmosphere, the roasting temperature is 750 ° C, and after 5 hours of insulation, the temperature is naturally cooled to room temperature to take out the material, and the mater...

Embodiment 2

[0037] The difference between this example and Example 1 is that in this example, step 1) triphenylmethane is replaced by triphenyl, and the remaining preparation methods and parameters are consistent with those of Example 1.

[0038] The battery assembly and electrochemical performance testing were identical to those in Example 1.

[0039] Scanning electron microscope analysis was performed on the pre-lithiated silicon-oxygen composite material prepared in Example 2, and its SEM image was obtained as shown in the attached figure 2 .

Embodiment 3

[0041] The difference between this example and Example 1 is that in this example, step 1) lithium powder is replaced with lithium amide, and other preparation methods and parameters are consistent with Example 1.

[0042] The battery assembly and electrochemical performance testing were identical to those in Example 1.

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Abstract

The invention discloses a pre-lithiated negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that lithium-containing powder, silicon oxide powder and a binder are mixed and then subjected to ball milling, then roasting is conducted under the protective atmosphere or vacuum condition, crushing and screening are conducted after natural cooling to obtain an intermediate product, then the intermediate product is soaked in an organic solvent B, and the pre-lithiated negative electrode material is obtained; and carrying out solid-liquid separation and vacuum drying to obtain the high-performance pre-lithiated negative electrode material. By adopting a synchronous pre-lithiation and carbon coating mode, the pH value of the pre-lithiated silica composite material is effectively reduced, the problem of poor cycle performance caused by mismatching of an alkaline material and a binder in a traditional pre-lithiation product is solved, meanwhile, a conductive substance and an SEI substance layer are formed on the surface layer of the material, volume expansion of the material in the using process is relieved, and the service life of the material is prolonged. And the continuous generation and decomposition of the SEI film in the use process of the battery material are avoided. When used as a lithium battery negative electrode, the material has the advantages of high first cycle efficiency, good cycle performance, high battery capacity and the like.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a pre-lithiated negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have broad application prospects in energy storage, communications, new energy and other industries. However, with the continuous expansion of market demand, the performance requirements of batteries have also increased. Silicon-based anode materials, including elemental silicon, silicon-oxygen materials, etc. , with the advantages of high energy density and suitable discharge platform, is one of the more potential next-generation anode materials, attracting extensive attention from many enterprises. However, in the application process, it was found that the silicon-based negative electrode material has problems such as a large volume expansion rate, and the material particles are easy to b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/36H01M4/625Y02E60/10
Inventor 杜宁闫允涛刘聪王振程康
Owner 浙江锂宸新材料科技有限公司