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
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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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