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Anode material for lithium ion batteries, preparation method and battery containing anode material

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, secondary batteries, etc., can solve the problems of large BET, poor carbon surface modification effect, and inability to industrialize, etc., to achieve Effects that enhance fit and enhance finishing effects

Inactive Publication Date: 2017-04-26
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and overcome the existing problems such as uneven dispersion of nano-silicon and the matrix, weak binding force, poor carbon surface modification effect, large BET, and inability to be industrialized.

Method used

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  • Anode material for lithium ion batteries, preparation method and battery containing anode material
  • Anode material for lithium ion batteries, preparation method and battery containing anode material
  • Anode material for lithium ion batteries, preparation method and battery containing anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Take 1Kg of silicon powder and use ethanol as the medium, wet-grind in a sand mill until the D50 particle size is 150nm, to obtain a silicon slurry containing 5wt% silicon;

[0042] (2) dissolving the polyvinyl butyral powder in ethanol to obtain a polyvinyl butyral resin alcohol solution with a concentration of 10 wt %;

[0043] (3) Take an appropriate amount of silicon slurry, resin alcohol solution, natural graphite with a particle size of 15 μm, and conductive carbon black, and the added amount is calculated according to the converted amount. Calculate the percentage of the total mass of the pure powder. After conversion, the addition ratio of silicon powder is 30wt%, the addition ratio of resin powder is 9wt%, the addition ratio of graphite powder is 60wt%, and the addition ratio of conductive agent powder is 1wt%, and then the mixed solution is stirred evenly , placed in a rotary evaporator to evaporate ethanol to obtain the precursor;

[0044] (4) Fully mix ...

Embodiment 2

[0051] (1) Take 1Kg of silicon powder and use ethanol as the medium, wet-grind in a sand mill until the D50 particle size is 100nm, to obtain a silicon slurry containing 10wt% silicon;

[0052] (2) dissolving the phenolic resin in ethanol to obtain a phenolic resin alcohol solution with a concentration of 30% by weight;

[0053] (3) Take appropriate amounts of silicon slurry, resin alcohol solution, natural graphite with a particle size of 9 μm, and nano-carbon fiber, and the added amount is calculated according to the converted amount. When converting, it is based on the four types of silicon powder, resin powder, natural graphite powder, and conductive agent. Calculate the percentage of the total mass of pure powder. After conversion, the addition ratio of silicon powder is 15%, the addition ratio of resin powder is 13%, the addition ratio of graphite powder is 70%, the addition ratio of conductive agent powder is 2%, and then the mixed solution is stirred evenly. Ethanol is...

Embodiment 3

[0059] (1) Take 1Kg of silicon powder and use ethanol as the medium, and wet-grind in a sand mill until the D50 particle size is 50nm to obtain a silicon slurry containing 15wt% silicon;

[0060] (2) dissolving the urea-formaldehyde resin in ethanol to obtain a urea-formaldehyde resin alcohol solution with a concentration of 20% by weight;

[0061] (3) Take appropriate amounts of silicon slurry, resin alcohol solution, natural graphite with a particle size of 6 μm, and nano-carbon fiber, and the amount added is calculated according to the converted amount. When converting, it is based on the four types of silicon powder, resin powder, natural graphite powder, and conductive agent. Calculate the percentage of the total mass of pure powder. After conversion, the proportion of silicon powder is 10%, the proportion of resin powder is 7%, the proportion of graphite powder is 80%, the proportion of conductive agent powder is 3%, and then the mixed solution is stirred evenly. Ethanol...

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Abstract

The invention relates to the technical field of anode materials for lithium ion batteries, and specifically relates to an anode material for lithium ion batteries, a preparation method of the anode material and a battery containing the anode material. The preparation method is characterized by comprising the following steps in sequence: preparing 5wt% to 15wt% of a silicon sizing agent; preparing 10wt% to 50wt% of a resinol solution; after uniformly mixing the silicon-containing sizing agent, the resinol solution, spherical graphite and a conductive agent, vaporizing a solvent through pressure reduction to obtain a precursor; after mixing the precursor and high-temperature asphalt in a weight ratio of (10: 1) to (2: 1) at a high speed, carrying out mechanical fusion for 1 to 30 min to obtain a fused material; putting the fused material in a cladding kettle, stirring while heating for pyrolysis; then sintering for carbonization in an inert atmosphere, and then sieving to obtain the anode material for the lithium ion batteries. Compared with the prior art, the prepared anode material for the lithium ion batteries has the advantages of small specific surface area, high first efficiency, good circulation, high rate capability and the like, nanometer silicon is uniformly dispersed on the surface of a basal body, and a stable SEI film can be formed on the surface of the material.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to negative electrode materials for lithium ion batteries, a preparation method and batteries containing the materials. Background technique [0002] The theoretical capacity of graphite is only 372mAh / g, while the theoretical capacity of silicon reaches 4200mAh / g. In order to improve the energy density of lithium-ion batteries, there have been more and more researches on silicon-containing negative electrode materials at home and abroad in recent years, and most of the research has focused on On the volume expansion generated during charging and discharging of silicon. [0003] In solving the problem of silicon expansion during charging and discharging, one of the more researches is silicon nano-silicon, silicon and substrate bonding to buffer expansion and other means; in the research, methods such as mechanical fusion are used to enh...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 董爱想沈龙吴志红
Owner SHANGHAI SHANSHAN TECH CO LTD
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