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Silicate framework-containing silicon-based negative electrode material, negative plate and lithium battery

A silicon-based negative electrode material, silicate technology, applied in the direction of negative electrodes, battery electrodes, circuits, etc., can solve the problems of poor cycle performance of silicon-based negative electrodes, achieve the effect of improving cycle performance and reducing deformation stress

Active Publication Date: 2020-12-29
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of poor volume expansion and large cycle performance of silicon-based negative electrodes has not been truly and effectively solved

Method used

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  • Silicate framework-containing silicon-based negative electrode material, negative plate and lithium battery
  • Silicate framework-containing silicon-based negative electrode material, negative plate and lithium battery
  • Silicate framework-containing silicon-based negative electrode material, negative plate and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] (1) Mix silicon oxide powder, magnesium metasilicate powder, and magnesium silicate powder evenly according to the mass ratio of 3:0.3:0.7, and place them in a vacuum furnace;

[0060] (2) At 1400°C, the mixture was heat-treated for 2 hours under vacuum, and after cooling, it was crushed and sieved;

[0061] (3) Mix the sieved sample with petroleum asphalt at a mass ratio of 20:1, place it in a high-temperature furnace, and heat-treat it at 900°C for 2 hours in a nitrogen atmosphere to obtain a silicon base containing magnesium metasilicate and a magnesium silicate skeleton. negative electrode.

[0062] In the solid-solid mixture used in the present invention, the silicate first adheres to the surface of the silicon oxide particles, and then undergoes high-temperature treatment. Driven by its own concentration difference, the silicate can quickly diffuse into the interior of the silicon oxide particles to form a skeleton structure.

[0063] (4) Prepare the negative ele...

Embodiment 2

[0067] (1) Mix silicon oxide powder and magnesium metasilicate powder evenly according to a mass ratio of 3:1, and place in a vacuum furnace;

[0068] (2) At 1400°C, the mixture was heat-treated for 2 hours under vacuum, and after cooling, it was crushed and sieved;

[0069] (3) Place the sieved sample in a rotary furnace, pass a mixed gas of argon and methane with a volume ratio of 3:1 at 1000°C, and keep it warm for 2 hours to obtain a silicon base containing a magnesium metasilicate skeleton. negative electrode;

[0070] (4) Prepare the negative electrode slurry with silicon-based negative electrode containing magnesium metasilicate skeleton, carbon black (SP) and sodium carboxymethyl cellulose (CMC) according to the ratio of 7:2:1, after coating and drying The negative pole piece is made, and the positive electrode material lithium cobalt oxide (LCO) is used as the counter electrode, and a button battery is assembled in a glove box, and the charge and discharge test is ca...

Embodiment 3

[0073] (1) Mix silicon oxide powder and nickel silicate powder evenly according to the mass ratio of 3:1, and place them in a vacuum furnace;

[0074] (2) At 1400°C, the mixture was heat-treated for 2 hours under vacuum, and after cooling, it was crushed and sieved;

[0075] (3) Place the sieved sample in a rotary furnace, pass a mixed gas of argon and acetylene with a volume ratio of 2:1 at 950°C, and keep it warm for 2 hours to obtain a silicon-based negative electrode containing a nickel silicate skeleton ;

[0076] (4) Prepare the negative electrode slurry with silicon-based negative electrode containing nickel silicate skeleton, carbon black (SP) and sodium carboxymethyl cellulose (CMC) according to the ratio of 7:2:1, after coating and drying The negative electrode sheet was formed, and the ternary positive electrode material nickel-cobalt lithium manganese oxide NCM 523 was used as the counter electrode, and a button battery was assembled in a glove box, and the charge...

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Abstract

The invention relates to a silicon-based negative electrode material containing a silicate framework, a negative plate and a lithium battery. The silicon-based negative electrode material comprises amodified silicon monoxide material in which a silicate material is dispersedly distributed, the general formula of the modified silicon monoxide material with the silicate material dispersed inside isMxSiOy, X is larger than or equal to 1 and smaller than 6, y is larger than or equal to 3 and smaller than 6, and the element M comprises one or more of Mg, Ni, Cu, Zn, Al, Na, Ca, K, Li, Fe and Co.wherein the grain size is 0.5 nm to 100 nm; in the modified silicon monoxide material, the content of the silicate material accounts for 5%-60% of the total mass of the modified silicon monoxide material; the dispersedly distributed silicate material forms a framework structure of the silicon-based negative electrode material, does not generate a physicochemical reaction along with lithium removaland lithium intercalation of the silicon-based negative electrode material in the circulation process, and keeps the original structure unchanged after multiple times of circulation.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a silicon-based negative electrode material containing a silicate skeleton, a negative electrode sheet and a lithium battery. Background technique [0002] The pursuit of long mileage of new energy vehicles puts forward higher requirements on the energy density of batteries. In order to achieve the best cost performance of electric vehicles, the energy density of a single battery needs to reach 350Wh / Kg (750Wh / L). In order to improve the energy density of batteries, domestic and foreign battery material factories are committed to developing positive and negative active materials with higher capacity densities. [0003] Silicon-based anode is currently the most commercially developed high-energy-density anode material. The theoretical capacity of metal silicon is as high as 4200mAh / g, but when intercalating lithium to form Li 22 Si 5 The process of alloying is accomp...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/136H01M4/58H01M4/48
CPCH01M4/1397H01M4/136H01M4/5825H01M4/483H01M2004/027Y02E60/10H01M4/366H01M4/36H01M4/386H01M4/485H01M4/364H01M4/625H01M4/48H01M10/0525H01M4/131H01M4/62H01M4/1395H01M10/052H01M4/134H01M2004/021
Inventor 殷营营刘柏男罗飞李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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