Method for pre-lithiation of silicon-based negative electrode material

A silicon-based negative electrode material and pre-lithiation technology, applied in battery electrodes, electrochemical generators, structural parts, etc., can solve the problems of low initial charge and discharge efficiency and affect the popularization and application of silicon-based negative electrode materials, etc., to improve the initial efficiency , the reaction is uniform and sufficient, and the preparation environment is not demanding

Inactive Publication Date: 2021-03-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inactive materials such as lithium oxide and lithium silicate will be generated during the lithium intercalation process of silicon-based negative electrode materials, resulting in low initial charge and discharge efficiency, which affects the popularization and application of silicon-based negative electrode materials.

Method used

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  • Method for pre-lithiation of silicon-based negative electrode material

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Embodiment 1

[0018] A method for pre-lithiation of silicon-based negative electrode materials, dissolving aromatic hydrocarbon organic substances in organic ethers, preparing a solution containing aromatic hydrocarbons, putting lithium flakes into the solution, and using aromatic hydrocarbons to react with lithium flakes Obtain the precursor solution of aromatic hydrocarbon lithium salt, then, add the silicon-based negative electrode material into the precursor solution, obtain the suspension, carry out the pre-lithiation reaction, after standing for a period of time, put the suspension under the protection of an inert atmosphere Calcining after drying to obtain a pre-lithiated silicon-based negative electrode material, as follows:

[0019] Step 1: disposing biphenyl and ethylene glycol dimethyl ether into a solution A with a biphenyl concentration of 1M;

[0020] Step 2: Put the lithium flakes into the solution A prepared in step 1 for full reaction, the molar ratio of lithium flakes to b...

Embodiment 2

[0025] A method for pre-lithiation of silicon-based negative electrode materials, similar to the steps in Example 1, as follows:

[0026] Step 1: Prepare biphenyl and tetrahydrofuran into a solution A with a biphenyl concentration of 1M;

[0027] Step 2: Put lithium flakes into solution A for full reaction, the molar ratio of lithium flakes to biphenyl is 2:1, thereby obtaining solution B;

[0028] Step 3: Soak the silicon-based negative electrode material in solution B and stir to form a suspension, and let it stand for 24 hours;

[0029] Step 4: The suspension is filtered, dried, and calcined at 700° C. to obtain the target product, the pre-lithiated silicon-based negative electrode material.

Embodiment 3

[0031] A method for pre-lithiation of silicon-based negative electrode materials, similar to the steps in Example 1, as follows:

[0032] Step 1: Prepare biphenyl and tetrahydrofuran into a solution A with a biphenyl concentration of 1M;

[0033] Step 2: Put lithium flakes into solution A for full reaction, the molar ratio of lithium flakes to biphenyl is 1.2:1, thereby obtaining solution B;

[0034] Step 3: Soak the silicon-based negative electrode material in solution B and stir to form a suspension, and let it stand for 12 hours;

[0035] Step 4: The suspension is filtered, dried and calcined at 800° C. to obtain the target product, the pre-lithiated silicon-based negative electrode material.

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Abstract

The invention discloses a method for pre-lithiation of a silicon-based negative electrode material. The method comprises the following steps: dissolving aromatic hydrocarbon organic matters in organicether to prepare an aromatic hydrocarbon-containing solution, putting a lithium sheet into the solution, and reacting aromatic hydrocarbon with the lithium sheet to obtain a precursor solution of aromatic hydrocarbon lithium salt; then adding the silicon-based negative electrode material into the precursor solution to obtain a turbid liquid, and carrying out a pre-lithiation reaction; and standing for a period of time, drying the turbid liquid under the protection of an inert atmosphere, and calcining to obtain the pre-lithiated silicon-based negative electrode material. The method has the advantages that the preparation is simple, the silicon-based material can be effectively pre-lithiated, and the first efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of pre-lithiation of lithium ion batteries, in particular to a method for pre-lithiation of silicon-based negative electrode materials. Background technique [0002] At present, the traditional lithium-ion battery negative electrode is mainly graphite negative electrode material, and its theoretical specific capacity is only 372mAh / g, which is increasingly unable to meet the needs of various industries. Therefore, it is imperative to develop new lithium-ion battery negative electrode materials. The theoretical specific capacity of silicon-based anode materials is as high as 2680~4200mAh / g, and at the same time, it has the advantages of large reserves and easy availability, so it has attracted widespread attention. However, inactive materials such as lithium oxide and lithium silicate will be generated during the lithium intercalation process of silicon-based negative electrode materials, resulting in low initial charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M10/058H01M10/0525H01M10/42
CPCH01M4/1395H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 崔大祥阳靖峰张芳卢玉英葛美英张放为王亚坤焦靖华
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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