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A kind of lithium-ion battery silicon-carbon composite negative electrode material and preparation method thereof

A silicon-carbon composite and negative electrode material technology, applied in the field of lithium-ion batteries, can solve problems such as the decrease in cycle performance of electrode materials, the reduction of the capacity of silicon-based composite materials, and the easy agglomeration of nano-silicon to achieve rapid electronic conduction and thermal evacuation. Performance and Conductivity Mitigation, Cost-Effective Effects

Active Publication Date: 2020-08-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Chinese patent CN201510252804.5 discloses a method for preparing a graphene-based silicon-carbon composite negative electrode material. The steps of the preparation method are: first prepare three-dimensional graphene particles, and then deposit nano-silicon on the surface of graphene by deposition, not only The process is complex, the cost is high, and the deposited nano-silicon is prone to agglomeration during the sintering process, resulting in a decrease in the cycle performance of the electrode material
[0007] Chinese patent CN201710544133.9 discloses a preparation method of graphene-silicon-carbon lithium-ion battery anode material. The preparation method steps are: graphene coating of nano-silicon particles, carbon coating primary composite material, carbonization and mixing; However, the sanding process of graphene and silicon in this method easily leads to the oxidation of silicon into silicon dioxide, thereby reducing the capacity of silicon-based composites.

Method used

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  • A kind of lithium-ion battery silicon-carbon composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery silicon-carbon composite negative electrode material and preparation method thereof
  • A kind of lithium-ion battery silicon-carbon composite negative electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Dissolve 1g of sucrose and 10g of ammonium carbonate in 30mL of deionized water and stir for 30 minutes, then add 3g of graphite with a D50 of 10μm and 0.5g of nano-silicon with a D50 of 50nm and stir for 1h, then place in a blast drying oven at 90°C and dry After 12 hours, a lump was obtained, and the above-mentioned lump solid was compacted into a green body by a film forming equipment, the pressure used was 8 mPa, and the pressure was maintained for 3 minutes. The above green body is placed in the constant temperature zone of the tube furnace, and under the protection of nitrogen, the temperature is raised to 300°C at a heating rate of 2°C / min for 3 hours, and then the temperature is continued to rise to 1000°C for 3 hours, and finally the temperature is naturally cooled to room temperature, and the sample is taken out. The sample is crushed and sieved to obtain a silicon-carbon composite negative electrode material with a median particle size D50 of 12.5 μm

Embodiment 2

[0058] 1g of sucrose and 10g of ammonium nitrate were dissolved in 30mL of water and stirred for 30 minutes, then 3g of graphite with a D50 of 10μm and 0.5g of nano-silicon with a D50 of 80nm were added and stirred for 1h, then placed in a blast drying oven and dried at 85°C to obtain Lumpy body, the above-mentioned lumpy solid is compacted into a green body by a film forming equipment, the pressure used is 10mPa, and the pressure is maintained for 6min. The above green body was placed in the constant temperature zone of the tube furnace, and under the protection of nitrogen, the temperature was raised to 120°C at a heating rate of 2°C / min for 3 hours, and then the temperature was continued to rise to 1000°C for 3 hours, and finally the temperature was naturally cooled to room temperature, and the samples were taken out. The sample was crushed and sieved to obtain a silicon-carbon composite negative electrode material with a median particle diameter D50 of 12.5 μm.

Embodiment 3

[0060] Dissolve 2g of glucose and 10g of ammonium bisulfate in 30mL of water and stir for 30min, then add 3g of 10μm graphite and 0.5g of nano-silicon with a D50 of 80nm and stir for 2h, then dry the above solution in a blast drying oven at 90°C to obtain a block. The body is compacted into a green body by a film forming equipment, the pressure used is 10mPa, and the pressure is maintained for 3min. The above green body is placed in the constant temperature zone of the tube furnace, and the above green body is placed in the constant temperature zone of the tube furnace. Under the protection of nitrogen, the temperature is raised to 220°C at a heating rate of 2°C / min and kept for 3h, and then continued to heat up to 1000°C for 3h. Finally, the temperature was naturally lowered to room temperature, and the sample was taken out. The above sample was crushed and sieved to obtain a silicon-carbon composite negative electrode material with a median particle size D50 of 12.5 μm.

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Abstract

The invention belongs to the field of energy storage study, and particularly relates to a lithium ion battery silicon carbon composite negative electrode material and a preparation method thereof. Thepreparation method comprises the following steps of (1) uniformly mixing graphene precursors, foam blowing agents, graphite and nanometer silicon; performing drying to obtain a solid material; (2) tightly compacting the solid materials into a blank body through film pressing shaping equipment; (3) performing heat treatment on the compacted blank body; performing high-temperature sintering to obtain the silicon carbon composite negative electrode material. When the silicon carbon composite negative electrode material prepared by the preparation method provided by the invention is applied to alithium ion battery, higher charging specific volume and excellent circulation stability are realized.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular, the invention relates to a silicon-carbon composite negative electrode material for a lithium-ion battery and a preparation method thereof Background technique [0002] At present, the anode materials of commercial lithium-ion batteries are mainly graphite anode materials. However, with the increase of battery energy density requirements for electric vehicles and large equipment, graphite anode materials can no longer meet the actual needs due to their low theoretical capacity (372mAh / g). , so it is urgent to develop an anode material with high energy density. [0003] Since silicon has a high theoretical capacity (4200mAh / g) and a low potential for intercalating lithium (<0.05V), and the voltage platform is slightly higher than that of graphite, it is difficult to cause lithium precipitation on the silicon surface during charging and discharging, and the safety performance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 贺艳兵李成飞康飞宇何中林蒋克林武洪彬李宝华程光春林平
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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