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Organic-inorganic composite silicon-based negative electrode material, and preparation method and application thereof

A composite silicon-based and negative electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of limiting the endurance of instruments or tools, the loss of active materials, and the deterioration of cycle performance, so as to improve the first-time efficiency, low cost, and improve the infiltration effect. Effect

Inactive Publication Date: 2021-01-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the vast majority of lithium-ion anode materials are made of graphite, but the theoretical specific capacity of graphite is only 372mAh / g, which is difficult to improve, which greatly limits the battery life of instruments or tools.
[0003] The theoretical specific capacity of silicon is as high as 4200mAh / g, and its delithiation potential is less than 0.5V, which is slightly higher than the voltage platform of graphite, and it is difficult to cause lithium precipitation on the surface, which has better safety performance. The expansion is as high as 300%. On the one hand, the silicon particles themselves will gradually pulverize and collapse due to the huge stress. On the other hand, there will be large gaps between the active material particles and between the active material and the current collector. loss, the cycle performance will be seriously deteriorated

Method used

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  • Organic-inorganic composite silicon-based negative electrode material, and preparation method and application thereof
  • Organic-inorganic composite silicon-based negative electrode material, and preparation method and application thereof
  • Organic-inorganic composite silicon-based negative electrode material, and preparation method and application thereof

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Effect test

Embodiment 1

[0030] A method for preparing an organic-inorganic composite silicon-based negative electrode material, comprising the steps of:

[0031] S1. Taking 1000g, the median particle size is 12.5μm, and the tap density is 1.02g / m 3 , the specific surface area is 1.08m 2 / g, capacity of 430mAh / g silicon-based material (composite material of silicon and graphite) put into 3kg acidic aqueous solution (acidic aqueous solution is hydrochloric acid with concentration of 1mol / L, sulfuric acid of 1mol / L, hydrogen of 1mol / L mixed aqueous solution of hydrofluoric acid) for acid etching for 3 hours, and then cleaned with deionized water for 5 times; then 80 g of pitch was fully mixed with the acid-etched silicon-based material, and carbonized at 900 ° C for 3 hours under the protection of N2 to obtain carbon Coated acid etched silicon-based materials;

[0032] S2. Soak the carbon-coated acid-etched silicon-based material in a mixed aqueous solution of sodium dodecylbenzenesulfonate and a sila...

Embodiment 2

[0034] A method for preparing an organic-inorganic composite silicon-based negative electrode material, comprising the steps of:

[0035] S1. Take 1000g, the median particle size is 6.3μm, and the tap density is 0.98g / m 3 , the specific surface area is 1.15m 2 The silicon-based material (composite material of silicon oxide and graphite) with a capacity of 420mAh / g is put into 3 kg of acidic aqueous solution (the acidic aqueous solution is hydrochloric acid with a concentration of 1mol / L, sulfuric acid with a concentration of 1mol / L, and 1mol / L mixed aqueous solution of hydrofluoric acid) for acid etching for 5 hours, and then cleaned with deionized water for 5 times; then fully mixed 100g of asphalt with the silicon-based material after acid etching, and carbonized at 900°C for 3 hours under the protection of N2 Obtain carbon-coated acid-etched silicon-based materials;

[0036] S2. Soak the carbon-coated acid-etched silicon-based material in a mixed aqueous solution of sodiu...

Embodiment 3

[0038] A method for preparing an organic-inorganic composite silicon-based negative electrode material, comprising the steps of:

[0039] S1, take 1000g of median particle size of 8.4μm, tap density of 1.0g / m 3 , the specific surface area is 1.10m 2 / g, capacity of 420mAh / g silicon-based material (composite material of silicon and graphite) put into 3kg acidic aqueous solution (acidic aqueous solution is hydrochloric acid with concentration of 1mol / L, sulfuric acid of 1mol / L, hydrogen of 1mol / L mixed aqueous solution of hydrofluoric acid) for acid etching for 5 hours, and then cleaned with deionized water for 5 times; then fully mixed 90 g of asphalt with the silicon-based material after acid etching, and carbonized at 900 ° C for 3 hours under the protection of N2 to obtain carbon Coated acid etched silicon-based materials;

[0040] S2. Soak the carbon-coated acid-etched silicon-based material in a mixed aqueous solution of sodium dodecylbenzenesulfonate and a silane coupli...

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Abstract

The invention discloses a preparation method of an organic-inorganic composite silicon-based negative electrode material. The method comprises the following steps: S1, carrying out acid pickling etching on a silicon-based material, uniformly mixing the silicon-based material with a carbon source, and carbonizing in an inert atmosphere to obtain a carbon-coated acid-etched silicon-based material; and S2, uniformly mixing the carbon-coated acid-etched silicon-based material with a mixed aqueous solution, soaking, and carrying out spray drying to obtain the organic-inorganic composite silicon-based negative electrode material, wherein a solute of the mixed aqueous solution is sodium dodecyl benzene sulfonate and a silane coupling agent. The invention also discloses an organic-inorganic composite silicon-based negative electrode material which is prepared according to the preparation method of the organic-inorganic composite silicon-based negative electrode material. The invention also discloses an application of the organic-inorganic composite silicon-based negative electrode material in a lithium ion battery. The method is simple in process, stable in performance, low in cost and excellent in cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an organic-inorganic composite silicon-based negative electrode material and a preparation method and application thereof. Background technique [0002] In recent years, lithium-ion batteries have been widely used in mobile phones, tablet computers, drones, battery cars, electric vehicles and other fields. At present, the vast majority of lithium-ion anode materials are made of graphite, but the theoretical specific capacity of graphite is only 372mAh / g, which is difficult to improve, which greatly limits the battery life of instruments or tools. [0003] The theoretical specific capacity of silicon is as high as 4200mAh / g, and its delithiation potential is less than 0.5V, which is slightly higher than the voltage platform of graphite, and it is difficult to cause lithium precipitation on the surface, which has better safety performance. The expansion is as high as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/483H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 王叶林少雄蔡桂凡毕超奇王健陈晨梁栋栋刘盛华
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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