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Anode material for lithium battery and lithium battery

A negative electrode material, lithium battery technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem of low coulombic efficiency in the first week

Active Publication Date: 2020-01-14
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

[0006] The object of the present invention is to provide a negative electrode material for a lithium battery and a lithium battery. The negative electrode material has a multi-layer core-shell structure, and the problem caused by the volume change in the charging and discharging process is alleviated through the shell coating layer, and the high specific surface area is improved. The resulting low Coulombic efficiency in the first week makes the silicon-carbon composite material have the advantages of long cycle and high stability, while the silicon oxide material guarantees high capacity and Coulombic efficiency in the first week at the same time.

Method used

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  • Anode material for lithium battery and lithium battery
  • Anode material for lithium battery and lithium battery
  • Anode material for lithium battery and lithium battery

Examples

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Effect test

Embodiment 1

[0047] This example provides a method for preparing a silicon-carbon composite material with a multilayer core-shell structure, including:

[0048] Step 1: Take 100mL of a mixed solvent of ethanol and water (volume ratio 1:4), add 20g of glucose to form a glucose solution. Take 10 g of a silicon oxide sample and add it to the glucose solution, and stir to form a uniform slurry. Add 30 g of spherical graphite (average particle size: 10 μm) to the slurry and continue to stir evenly.

[0049] The second step: drying the above slurry at 120° C. for 12 hours to remove the solvent. The resulting product was heated in a tube furnace at 600°C with high-purity N 2 Under pyrolysis for 8 hours, after cooling, grind and sieve (400 mesh).

[0050] Step 3: Put the sieved sample into a tube furnace with argon gas and heat it up to 900°C, then switch the argon gas to a gas mixed with argon and natural gas (volume ratio is 2:1), at 700°C After heating for 12 hours, the composite material w...

Embodiment 2

[0057] This example provides a method for preparing a silicon-carbon composite material with a multilayer core-shell structure, including:

[0058] Step 1: Take 100mL of a mixed solvent of ethanol and water (volume ratio 1:4), add 30g of dextrin to form a starch solution. Take 10g of siloxane sample and 1g of acetylene black (average particle size: 30nm) into the starch solution, and stir for 2 hours to form a uniform slurry. Add 30 g of spherical graphite (average particle size: 10 μm) to the slurry and continue to stir evenly.

[0059] Step 2: Dry the above slurry at 120° C. for 8 hours to completely remove the solvent. The obtained product was heated in a tube furnace at 600 °C with high-purity N 2 Under pyrolysis for 5 hours, after cooling, grind and sieve (400 mesh).

[0060] Step 3: put the sieved sample into a tube furnace with argon and heat up to 900°C, then switch the argon to a gas mixed with argon and toluene (volume ratio is 4:1), at 900°C The composite materi...

Embodiment 3

[0062] This example provides a method for preparing a silicon-carbon composite material with a multilayer core-shell structure, including:

[0063] Step 1: Take 8g of siloxane sample, 5g of carbon hard balls (average particle size of 5μm) and 1g of asphalt, and ball mill for 2 hours.

[0064] The second step: the mixture after ball milling is put in a tube furnace at 600°C, high-purity N 2 Under pyrolysis for 5 hours, after cooling, grind and sieve (400 mesh).

[0065] Step 3: Put the sieved sample into a tube furnace with argon gas and heat it up to 900°C, then switch the argon gas to a gas mixed with argon and acetylene (volume ratio is 2:1), at 900°C The composite material with multi-layer core-shell structure of the present invention was obtained by heating at low temperature for 8 hours. The data are recorded in Table 1.

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Abstract

The embodiment of the invention relates to an anode electrode material for a lithium battery and a lithium battery. The anode material is a silicon-carbon composite material with a core-shell structure, wherein the inner core of the anode material is carbon particles, a first coating layer is a coating layer composed of silylene oxide or a composite material of silylene and a buffer material, anda second coating layer is a dot-shaped coated carbon particle layer or a continuously coated carbon coating layer; the mass ratio of the carbon particles of the inner core to the anode material is (0,95%); the mass ratio of the first coating layer to the anode material is [10%, 95%]; the mass ratio of the second coating layer to the anode material is [0, 10%]; in the Raman spectrum of the anode material, the anode material has amorphous 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 exist at 1360+ / -20 cm-1 and 1580+ / -20 cm-1.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a lithium battery negative electrode material and the lithium battery. Background technique [0002] Carbon-based negative electrode materials have the advantages of good thermal stability, high equilibrium potential, and high first-week Coulombic efficiency. However, the theoretical capacity of carbon-based negative electrode materials is only 372mAh / g, and the application of carbon-based negative electrode materials in lithium-ion batteries is limited. Certain restrictions. [0003] As the anode material of lithium-ion batteries, silicon has a theoretical reversible capacity of up to 4200mAh / g. However, due to the huge volume effect of silicon materials in the process of deintercalating lithium, the electrode material structure collapses and the solid electrolyte interface (SEI) film is unstable. The battery cycle is greatly reduced. In order to improve silicon-based anode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/628H01M4/587H01M4/366H01M4/386H01M10/0525H01M2004/027H01M2004/021Y02E60/10
Inventor 罗飞刘柏男李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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