Lithium battery anode material with core-shell structure and lithium battery

A technology of negative electrode material and core-shell structure, which is applied in the field of negative electrode material for lithium battery and lithium battery, can solve the problems of low coulombic efficiency in the first week, etc. The effect of stability

Inactive Publication Date: 2020-01-14
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a lithium battery negative electrode material with a core-shell structure. The negative electrode material has a core-shell structure, and the problem caused by the volume change during the charging and discharging process of the battery is alleviated through the shell coating layer or the particle layer, and the improvement is achieved. The problem of low first-week coulombic efficiency caused by high specific surface area is solved, so that the silicon-carbon composite material has the advantages of long cycle and high stability, while the silicon oxide material guarantees high capacity and first-week coulombic efficiency at the same time

Method used

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  • Lithium battery anode material with core-shell structure and lithium battery
  • Lithium battery anode material with core-shell structure and lithium battery
  • Lithium battery anode material with core-shell structure and lithium battery

Examples

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Embodiment 1

[0045] This example provides a method for preparing a silicon-carbon composite material with a core-shell structure, including:

[0046] Step 1: Take 100 mL of a mixed solvent of ethanol and water (volume ratio 1:2), and add 30 g of sucrose to form a sucrose solution. Take 10 g of silylene oxide sample and 1 g of carbon black (average particle size of 50 nm), add them to the sucrose solution, and stir to form a uniform slurry.

[0047] Step 2: Dry the above slurry at 120°C for 8 hours to completely remove the solvent. Put the obtained product in a tube furnace at 600℃, high purity N 2 Pyrolyze for 8 hours, grind after cooling, and sieve (400 mesh).

[0048] The third step: Put the sieved sample into a tube furnace filled with argon and raise the temperature to 900°C, then switch the argon gas to a mixed gas of argon and acetylene (volume ratio 4:1), at 900°C After heating for 10 hours, the composite material with the core-shell structure of the present invention is prepared.

[0049...

Embodiment 2

[0054] This example provides a method for preparing a silicon-carbon composite material with a core-shell structure, including:

[0055] The first step: Take 10g of silylene oxide sample and mix with 5g pitch, and ball mill for 8 hours.

[0056] Step 2: Put the ball milled product in a tube furnace at 500℃, high purity N 2 Pyrolyze for 2 hours, grind after cooling, and sieve (400 mesh).

[0057] The third step: Put the sieved sample into a tube furnace filled with argon to heat up to 900℃, then switch the argon gas to a mixture of argon and acetylene (volume ratio 3:1), at 900℃ After heating for 8 hours, the composite material with core-shell structure of the present invention is prepared. The data is recorded in Table 1.

Embodiment 3

[0059] This example provides a method for preparing a silicon-carbon composite material with a core-shell structure, including:

[0060] The first step: Take 10g of silylene oxide sample and mix with 5g glucose, and ball mill for 2 hours.

[0061] Step 2: Put the ball milled mixture in a tube furnace at 600℃, high purity N 2 Pyrolyze for 5 hours, grind after cooling, and sieve (400 mesh).

[0062] The third step: Put the sieved sample into a tube furnace filled with argon and raise the temperature to 900°C, then switch the argon gas to a mixed gas of argon and acetylene (volume ratio 4:1), at 900°C After heating for 8 hours, the composite material with core-shell structure of the present invention is prepared. The data is recorded in Table 1.

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Abstract

The embodiment of the invention relates to a lithium battery anode material with a core-shell structure and a lithium battery. The anode material is a silicon-carbon composite material with a core-shell structure, wherein an inner core of the anode material is silylene oxide or a composite material of silylene and a buffer material, and the shell of the anode material is one or more coating layersor particle layers composed of carbon, carbon particles, carbon fibers or carbon nanotubes with a protective effect; the mass ratio of the silylene oxide to the anode material is 5%-95%; the mass ofthe buffer material is 1-300% of the mass of the silylene oxide; the shell accounts for 0.1%-10% of the mass of the anode material; in the Raman spectrum of the anode material, the anode material hasamorphous bumps at 475+/-10 cm-1, and/or has crystalline peaks at 510+/-10 cm-1; and the anode material has characteristic peaks of carbon at 1360+/-20 cm-1 and 1580+/-20 cm-1.

Description

Technical field [0001] The present invention relates to the technical field of batteries, in particular to a lithium battery negative electrode material with a core-shell structure and a lithium battery. Background technique [0002] Carbon-based anode materials are widely used in anode materials due to their excellent electrical conductivity, lower working potential, and small volume change of deintercalated lithium, which enables the high energy density and long cycle life of lithium batteries to be realized, and Commercialization was realized in 1991. However, the theoretical capacity of carbon-based anode materials is only 372mAh / g, which limits the further development of carbon-based anode materials in lithium-ion batteries. [0003] In order to realize the high specific capacity of the negative electrode, people continue to develop new negative electrode materials. The theoretical reversible capacity of silicon as a negative electrode material for lithium-ion batteries is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M10/0525
CPCH01M4/134H01M4/386H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 罗飞刘柏男李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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