Negative electrode material for lithium battery and preparation method of negative electrode material

A negative electrode material, lithium battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of not having sufficient mechanical strength, porous silicon is difficult to coat, and is easy to be damaged, and achieves excellent cycle stability and rate Performance, improvement of interface contact performance, effect of suppressing volume effect

Inactive Publication Date: 2016-08-10
周志才
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Problems solved by technology

However, in the actual application process, the nano-silicon material is difficult to disperse evenly due to agglomeration, and it will also react with the electrolyte, resulting in an increase in the irreversible capacity.
Carbon materials have high electronic conductivity and ion conductivity, which can improve the rate performance of silicon-based materials and suppress the volume effect of silicon in the cycle process. However, when silicon materials are combined with carbon materials, the interface contact between the two materials is poor. Covering Incomplete Issues
The application number is 201310548457.1 "A Lithium Battery Anode Material Carbon-Coated Silicon Graphite and Its Preparation Method" discloses a silicon-carbon composite lithium battery anode material. This invention improves the first cycle Coulombic efficiency of lithium batteries, but due to the coating Carbon does not have sufficient mechanical strength. When the silicon material expands, it is easily damaged and cannot suppress the volume effect of the silicon material.
[0005] Based on the existing problems of nano-silicon materials and carbon-silicon composites, the present invention provides a silicon negative electrode material for lithium batteries and a preparation method thereof. The method uses nano-scale porous graphene to coat nano-porous silicon to solve the problem of agglomeration and Difficult to cover the inside of porous silicon, the lithium battery anode material prepared by this method has excellent cycle stability and rate performance, and is suitable for the production of high-power lithium battery anode

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  • Negative electrode material for lithium battery and preparation method of negative electrode material
  • Negative electrode material for lithium battery and preparation method of negative electrode material
  • Negative electrode material for lithium battery and preparation method of negative electrode material

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preparation example Construction

[0028] A preparation method of a negative electrode material for a lithium battery, comprising the steps of:

[0029] (a) adding nanoporous silicon into nitric acid with a concentration of 16 mol / L, and stirring until completely dissolved to obtain a nanoporous silicon solution;

[0030] (b) adding nano-graphene and sodium lignosulfonate into water, and stirring until the nano-graphene is completely dissolved to obtain a nano-graphene solution;

[0031] (c) Add 0.1mol / L NaOH solution to neutralize nitric acid in the nanoporous silicon solution, and gradually add until no precipitation occurs;

[0032] (d) filtering and washing the precipitate in step (c) to neutrality, and then adding it to the graphene nano-solution in step (b), and oscillating with ultrasonic waves to completely disperse the precipitate in the graphene nano-solution to obtain mixture;

[0033] (e) Heat the mixed solution to 80°C for 2 hours, then lower it to room temperature, add 10% hydrochloric acid to t...

Embodiment 1

[0045] The lithium battery negative electrode material in this embodiment has a three-layer structure: the inner layer is nanoporous silicon, the outer layer is nanographene, and the middle layer is graphite. Among them, the nanoporous silicon has a particle size of 100nm and a pore size of 25nm; the nanographene has a particle size of 3nm; and the graphite is sintered graphite.

[0046] A preparation method of lithium battery negative electrode material is as follows:

[0047] (a) adding nanoporous silicon into nitric acid with a concentration of 16 mol / L, and stirring until completely dissolved to obtain a nanoporous silicon solution;

[0048](b) adding nano-graphene and sodium lignosulfonate into water, and stirring until the nano-graphene is completely dissolved to obtain a nano-graphene solution;

[0049] (c) Add 0.1mol / L NaOH solution to neutralize nitric acid in the nanoporous silicon solution, and gradually add until no precipitation occurs;

[0050] (d) filtering an...

Embodiment 2

[0054] The lithium battery negative electrode material in this embodiment has a three-layer structure: the inner layer is nanoporous silicon, the outer layer is nanographene, and the middle layer is graphite. The nanoporous silicon has a particle size of 200nm and a pore size of 35nm; the nanographene has a particle size of 8nm; and the graphite is sintered graphite.

[0055] A preparation method of lithium battery negative electrode material is as follows:

[0056] (a) adding nanoporous silicon into nitric acid with a concentration of 16 mol / L, and stirring until completely dissolved to obtain a nanoporous silicon solution;

[0057] (b) adding nano-graphene and sodium lignosulfonate into water, and stirring until the nano-graphene is completely dissolved to obtain a nano-graphene solution;

[0058] (c) Add 0.1mol / L NaOH solution to neutralize nitric acid in the nanoporous silicon solution, and gradually add until no precipitation occurs;

[0059] (d) filtering and washing t...

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Abstract

The invention provides a negative electrode material for a lithium battery and a preparation method of the negative electrode material. The negative electrode material for the lithium battery has the structure as follows: the inner layer is nanometer porous silicon; the outer layer is nano graphene; and the middle layer is graphite. The lithium battery manufactured by the negative electrode material for the lithium battery has the advantages of good rate capability and stable cycle performance; the method provided by the invention is simple to operate; and industrial production is easy to achieve.

Description

technical field [0001] The invention relates to a lithium battery electrode, in particular to a negative electrode material suitable for a high-power lithium battery and a preparation method thereof. Background technique [0002] Compared with the traditional graphite anode, silicon has an ultra-high theoretical specific capacity (4200 mAh / g) and a lower delithiation potential (<0.5 V), and the voltage plateau of silicon is slightly higher than that of graphite, which makes it difficult to cause surface Lithium analysis, better safety performance. Silicon has become one of the potential choices for upgrading carbon-based anodes of lithium-ion batteries. However, silicon also has disadvantages as an anode material for lithium-ion batteries. Silicon is a semiconductor material with low electrical conductivity. During the electrochemical cycle, the intercalation and extraction of lithium ions will cause the volume of the material to expand and shrink by more than 300%, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/36H01M4/38
CPCH01M4/133H01M4/1393H01M4/366H01M4/38Y02E60/10
Inventor 唐林
Owner 周志才
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