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Lithium replenishment method for negative electrode active material of lithium ion battery

A negative electrode active material and lithium-ion battery technology, applied in the direction of active material electrodes, battery electrodes, negative electrodes, etc., can solve the problem of low initial coulombic efficiency of negative electrode active materials, achieve improved electrochemical performance, easy control of lithium supplementation, The effect of improving the initial Coulombic efficiency

Active Publication Date: 2022-02-11
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention can effectively solve the problem of low initial coulombic efficiency of the negative electrode active material of the lithium ion battery, and provides a lithium supplementation method with a mild and simple process and a controllable lithium supplementation amount

Method used

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  • Lithium replenishment method for negative electrode active material of lithium ion battery
  • Lithium replenishment method for negative electrode active material of lithium ion battery
  • Lithium replenishment method for negative electrode active material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] First, weigh 185.1g of biphenyl and 273.3g of 3,3'-dimethylbiphenyl and dissolve them in 1000mL of tetrahydrofuran and 1000mL of ethylene glycol dimethyl ether to obtain biphenyl solution and 3,3'-dimethylbiphenyl solution; then weigh 50g of lithium ingots and add them to biphenyl solution and 3,3'-dimethylbiphenyl solution respectively, after the lithium ingots dissolve Obtain organolithium solution F1 and organolithium solution G1;

[0063] Then, at 30°C, add 200g of silicon oxide into 1000mL of organolithium solution F1, mechanically stir for 14 hours and then filter, then add the filtered product to 800mL of organolithium solution G1, continue stirring for 8 hours, and then filter to obtain Lithium Supplement Silicon oxide J1; then add 150 g of lithium-supplemented silicon oxide J1 into 500 mL of 0.2 mol / L biphenyl solution, stir mechanically for 2.5 hours, filter, and dry to obtain lithium-supplemented silicon oxide K1;

[0064] Then put the obtained lithium-suppl...

Embodiment 2

[0067] First, weigh 1282.1g of naphthalene and 920.2g of 4,4'-dimethylbiphenyl and dissolve them in 1000mL of tetrahydrofuran respectively in a low-humidity -20°C environment filled with argon to obtain naphthalene solution and 4,4 '-dimethylbiphenyl solution; then weigh 350g and 525g of lithium flakes and add them to the naphthalene solution and 4,4'-dimethylbiphenyl solution, and the lithium flakes are dissolved to obtain organolithium solution F2 and organolithium solution G2 ;

[0068] Then at 10°C, add 250g of silicon oxide into 1000mL of organolithium solution F2, mechanically stir for 50h and then filter, then add the filtered product into 800mL of organolithium solution G2, continue stirring for 4h, and then filter to obtain Lithium Supplement Silicon oxide J2; then add 150 g of lithium-enriched silicon oxide J2 to 300 mL of 1 mol / L phenanthrene solution, mechanically stir for 72 hours, filter, and dry to obtain lithium-enriched silicon oxide K2;

[0069] Then put the...

Embodiment 3

[0072] First, weigh 2.3g of p-terphenyl and 2.9g of 3,3',4,4'-tetramethylbiphenyl and dissolve them in 1000mL of tetrahydrofuran and 1000mL In the ethylene glycol dimethyl ether, obtain p-terphenyl solution and 3,3',4,4'-tetramethylbiphenyl solution; Then weigh 35g and 12g of lithium strips and add p-terphenyl solution and 3, In the 3',4,4'-tetramethylbiphenyl solution, the lithium strips are dissolved to obtain organolithium solution F3 and organolithium solution G3;

[0073] Then at 80°C, add 100g of hard carbon into 1000mL of organolithium solution F3, mechanically stir for 20h and then filter, then add the filtered product into 50mL of organolithium solution G3, continue stirring for 0.1h, and then filter to obtain lithium supplement Hard carbon J3; then add 12g of lithium-replenishing hard carbon J3 into 1200mL of 10mol / L anthracene solution, mechanically stir for 0.5h, filter, and dry to obtain lithium-replenishing hard carbon K3;

[0074] Then put the obtained lithium-...

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Abstract

The invention discloses a method for supplementing lithium with negative electrode active materials of lithium ion batteries, belonging to the field of lithium ion batteries. The key to the lithium supplementation method is to add the negative electrode active material into the organic lithium solution in two stages to obtain the second-stage lithium supplementary active material, and then add the second-stage lithium supplementary active material to the organic compound solution for calcination and cleaning , to obtain a lithium supplement active material product. The present invention adopts a two-stage method to supplement lithium, which not only helps to form a dense and good SEI film on the surface of the active material, but also makes the lithium supplementing degree of the active material higher and achieves a higher initial Coulombic efficiency; Lithium supplementation significantly and effectively improves the initial Coulombic efficiency and electrochemical performance of the battery. The invention adopts an organic solution oxidation-reduction method to supplement lithium to the negative electrode active material, the process is mild, the amount of lithium supplementation is controllable, and the accuracy is high, which is suitable for existing equipment and is beneficial to industrial application.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a method for supplementing lithium with negative electrode active materials of lithium ion batteries. Background technique [0002] With the improvement of people's living standards, lithium-ion batteries have been widely used in energy storage systems and energy fields. The development of lithium-ion batteries with the characteristics of good environmental compatibility, low cost, high energy density and long cycle life has become a The most competitive technology for energy demand. The application of advanced electrode active materials has promoted the development of this technology. Due to its high specific capacity, silicon-based materials are considered to be the most potential electrode active materials for lithium-ion batteries with high energy density. However, after charging and discharging, the surface The formation of SEI film causes irreversible loss of active lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/58H01M10/0525
CPCH01M4/04H01M4/5825H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 王凯锋曹新龙田占元薛孟尧杨时峰胥鑫霍林智张长安曹国林
Owner SHAANXI COAL & CHEM TECH INST
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