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Silicon/activated charcoal composite cathode material and preparation method thereof

A technology of negative electrode material and activated carbon, which is applied in the field of silicon/activated carbon composite negative electrode material and its preparation, can solve the problems of high lithium ion diffusion resistance and low porosity of carbon coating layer, achieve good cycle stability and facilitate rapid diffusion , the effect of good charge and discharge rate performance

Inactive Publication Date: 2017-05-31
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems in the prior art, such as the low porosity of the carbon coating layer in the silicon / carbon composite material, and the high diffusion resistance of lithium ions in the carbon layer during charging and discharging, thereby improving the performance of the silicon / carbon composite material. Electrochemical properties

Method used

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  • Silicon/activated charcoal composite cathode material and preparation method thereof
  • Silicon/activated charcoal composite cathode material and preparation method thereof
  • Silicon/activated charcoal composite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A silicon / activated carbon composite negative electrode material and a preparation method thereof, is characterized in that it comprises the following steps:

[0037] 1) Disperse 1.395g of nano silicon spheres in 250mL of hydrochloric acid solution to obtain a suspension;

[0038] The pH value of the hydrochloric acid solution is 1;

[0039] 2) Add 1.395 g of dispersant polyvinylpyrrolidone (PVP) to the suspension in step 1) to obtain mixture A;

[0040] 3) adding aniline monomer to the mixture A obtained in step 2) to obtain a mixture B;

[0041] The weight ratio of described aniline monomer and nano silicon sphere is 3: 1;

[0042] 4) Under stirring, ammonium persulfate was added dropwise to mixture B, and after 10 hours of polymerization reaction, the product was filtered, washed, and dried to obtain a silicon / polyaniline composite;

[0043] The ratio of the amount of substance of the ammonium persulfate to the aniline monomer in step 2) is 1:1;

[0044] The temp...

Embodiment 2

[0050] Use the silicon porous carbon composite material that obtains in embodiment 1 to carry out the following steps:

[0051] 1) The silicon porous carbon composite material is mixed with the conductive agent acetylene black and the binder CMC respectively according to the mass ratio of 60:20:20, and the mixture is prepared into a slurry with distilled water, and evenly coated on the copper foil, 60 ℃ Vacuum dried for 8 hours to prepare a pole piece for an experimental battery.

[0052] 2) Lithium sheet is used as the counter electrode, and the electrolyte is 1mol / L (volume ratio is 1:1:1) LiPF 6 / EC+DEC+DMC solution, the diaphragm is Celgard 2400 film, and assembled into a LIR2430 button cell in a glove box filled with an argon atmosphere.

[0053] figure 2 The cycle performance curve of the silicon / activated carbon nanocomposite assembled battery provided in this example.

[0054] According to the silicon / activated carbon composite material prepared under the condition...

Embodiment 3

[0057] A silicon / activated carbon composite negative electrode material and a preparation method thereof, is characterized in that it comprises the following steps:

[0058] 1) Disperse 1.395g of nano silicon spheres in 250mL of hydrochloric acid solution to obtain a suspension;

[0059] The pH value of the hydrochloric acid solution is 1;

[0060] 2) Add 2.79 g of dispersant Pluronic F127 (Pluronic F127) to the suspension in step 1) to obtain mixture A;

[0061] 3) adding aniline monomer to the mixture A obtained in step 2) to obtain a mixture B;

[0062] The weight ratio of described aniline monomer and nano silicon ball is 4: 1;

[0063] 4) Add ammonium persulfate dropwise to mixture B under stirring, and after 24 hours of polymerization, filter, wash and dry the product to obtain a silicon / polyaniline composite;

[0064] The ratio of the amount of substance of the ammonium persulfate to the aniline monomer in step 2) is 1:1;

[0065] The temperature in the polymerizati...

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Abstract

The invention discloses a silicon / activated charcoal composite cathode material and a preparation method thereof. The preparation method comprises the following steps: 1) dispersing nanosilicon spheres in a hydrochloric acid solution to obtain a turbid liquid, the concentration of which is 3-11g / L; 2) adding a dispersant into the turbid liquid obtained in the step 1) to obtain a mixture A; 3) adding a phenylamine monomer into the mixture A obtained in the step 2) to obtain a mixture B; 4) in a stirring state, dropwise adding ammonium persulfate into the mixture B to perform a polymerization reaction for 8-24h to obtain a silicon / polyaniline compound; 5) transferring the silicon / polyaniline compound obtained in the step 4) to a tubular furnace to be carbonized under inert gas shielding; and 6) heating the tubular furnace to the activating temperature under inert gas shielding, then introducing activating gas to activate for 0.5-3h, converting the gas in the tubular furnace into inert gas, and cooling the tubular furnace to room temperature to obtain the silicon / activated charcoal compound.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a silicon / activated carbon composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries using graphite as the negative electrode material have been widely used in portable electronic products such as notebook computers, mobile phones and digital equipment. In recent years, the rapid development of the electric vehicle industry has put forward higher requirements on the capacity, life, rate performance, safety and reliability of lithium-ion batteries. Silicon anode materials have attracted much attention because of their high theoretical specific capacity, wide sources, and low price, but the serious volume expansion (~300%) of silicon during charge and discharge causes the destruction of the structure of electrode materials and depletion from the current collector. Falling off leads to rapid declin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 赵朔姚丛羡小超朱伟郭群吴朝锦冉超
Owner CHONGQING UNIV
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