A porous nano silicon-carbon composite material prepared by a magnesium thermal reduction method and a preparation method thereof

A technology of carbon composite materials and nanocomposites, applied in the direction of nanocarbon, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of reducing cycle life, shedding of negative active materials, and reducing the reversible capacity of silicon-carbon composite materials and other problems, to achieve the effect of easy removal, less residue, and improved reversible capacity

Inactive Publication Date: 2019-01-18
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this material does not control the structure of the composite of mesoporous carbon and silicon particles. If the stacked volume of the porous carbon and silicon particle composite is too large, the silicon inside the stacked volume that is deeper from the surface cannot participate in the battery charge-discharge reaction, thus reduc

Method used

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  • A porous nano silicon-carbon composite material prepared by a magnesium thermal reduction method and a preparation method thereof
  • A porous nano silicon-carbon composite material prepared by a magnesium thermal reduction method and a preparation method thereof
  • A porous nano silicon-carbon composite material prepared by a magnesium thermal reduction method and a preparation method thereof

Examples

Experimental program
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Example Embodiment

[0032] Example 1

[0033] (1) Preparation of polystyrene (PS) microsphere emulsion:

[0034] Dissolve 3g of polyvinylpyrrolidone in 180g of water, add 8.5g of styrene, stir and heat to 70℃, then dissolve 0.18g of initiator azobisisobutylamidine hydrochloride in 30g of water and add it to a glass reactor for reaction Within 24 hours, a polystyrene (PS) microsphere emulsion was obtained, and the particle size range of the microspheres was 200 nm;

[0035] (2) Polystyrene / silica core-shell structure composite (PS / SiO 2 ) Preparation:

[0036] Disperse 6g polystyrene microsphere emulsion in 100g water, stir for 10 minutes, continue to add a mixed solution containing 0.6g template cetyltrimethylammonium bromide (CTAB), 39.5g ethanol, 1g ammonia, and stir for 30 In minutes, 1.4g of tetraethyl orthosilicate (TEOS) was slowly added dropwise to the above mixed solution, stirred at 30°C for 6 hours, centrifuged, and dried in a vacuum drying oven at 110°C for 5 hours to obtain polystyrene / dioxi...

Example Embodiment

[0051] Example 2

[0052] (1) Preparation of polystyrene (PS) microsphere emulsion:

[0053] Dissolve 6g of polyvinylpyrrolidone in 180g of water, add 12g of styrene, stir and heat to 70°C, then dissolve 0.7g of initiator azobisisobutylamidine hydrochloride in 30g of water, add it to the reaction system and react for 18 hours , Obtain polystyrene (PS) microsphere emulsion, the particle size range of the microsphere is 100nm;

[0054] (2) Polystyrene / silica core-shell structure composite (PS / SiO 2 ) Preparation:

[0055] Disperse 8.0g polystyrene microsphere emulsion in 100g water, stir for 15 minutes, continue to add a mixed solution containing 3g template cetyltrimethylammonium bromide (CTAB), 50g ethanol, 1g ammonia, and stir for 30 minutes , Add 7.0g of ethyl orthosilicate (TEOS) slowly dropwise to the above mixed solution, keep stirring at 35°C for 4 hours, centrifuge and dry to obtain a polystyrene / silica core-shell structure composite (PS / SiO 2 ) Product, the overall particle s...

Example Embodiment

[0063] Example 3

[0064] (1) Preparation of polystyrene (PS) microsphere emulsion:

[0065] Dissolve 1g of polyvinylpyrrolidone in 180g of water, add 5g of styrene, stir and heat to 70°C, then dissolve 0.1g of initiator azobisisobutylamidine hydrochloride in 30g of water, and add it to a glass reactor for reaction 12 After hours, a polystyrene (PS) microsphere emulsion is obtained, the particle size range of the microspheres is 50nm;

[0066] (2) Polystyrene / silica core-shell structure composite (PS / SiO 2 ) Preparation:

[0067] Disperse 3.0g polystyrene microsphere emulsion in 100g water, stir for 12 minutes, continue to add a mixed solution containing 1g template cetyltrimethylammonium bromide (CTAB), 30g ethanol, 1g ammonia, and stir for 30 minutes , Slowly add 1g of tetraethyl orthosilicate (TEOS) dropwise to the above mixed solution, keep stirring at 25°C for 9 hours, centrifuge, and dry in a vacuum drying oven at 110°C for 5 hours to obtain polystyrene / silica core shell Struc...

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Abstract

The invention relates to a lithium ion battery negative electrode porous nano silicon-carbon composite material and its preparation method. At first, that polystyrene microsphere emulsion is prepared,the template agent, ethanol, ammonia and tetraethyl orthosilicate are added to perform reaction, A polystyrene/silica core-shell structure composite is obtained, Then calcining is performed at high temperature to obtain hollow carbon/silicon dioxide nanocomposite, then magnesium powder is added for reduction reaction to obtain hollow porous carbon/silicon nanocomposite, finally graphite is mixed,spray drying, high temperature heat treatment, crushing, sieving are performed to obtain porous nanosilicon carbon composite. The porous nano silicon-carbon composite material of the negative electrode of the lithium ion battery prepared by the method has high reversible capacity, good electrical conductivity, high energy density and long cycle life.

Description

technical field [0001] The invention belongs to lithium-ion battery negative electrode materials and a preparation method thereof, and relates to a lithium-ion battery negative electrode porous nano-silicon-carbon composite material and a preparation method thereof. Background technique [0002] In the research and application of lithium-ion battery anode materials, the theoretical specific capacity of silicon-based materials is the highest, the alloy formed by it is LixSi, the range of x is 0-4.4, and the theoretical specific capacity of pure silicon is 4200mAh / g, while the current commercial anode materials The theoretical capacity of natural graphite is only 372mAh / g, and silicon has no solvation, its raw materials are abundant, and it has higher stability than other metal materials. It is considered to be the most anticipated high-capacity lithium-ion battery anode material. However, the silicon anode undergoes serious volume expansion and contraction during the lithium ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525C01B33/023C01B32/21C01B32/15B82Y30/00
CPCB82Y30/00C01B33/023C01B32/15C01B32/21H01M4/36H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘祥王奥宁王金培徐晨
Owner NANJING UNIV OF TECH
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