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A kind of silicon-carbon composite negative electrode material and its preparation method and application

A composite material, in-situ composite technology, applied in nanotechnology, silicon compounds, chemical instruments and methods for materials and surface science to improve capacity, improve conductivity, and avoid agglomeration

Active Publication Date: 2022-05-03
湖南宸宇富基新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the deficiencies of the prior art, to solve the problems of carbon materials for silicon-carbon composites in terms of shape control, interface improvement, and cost reduction, the first purpose of the present invention is to provide a silicon carbon nano-silicon loaded with nitrogen-rich graphite nanosheets Composite anode active materials, aiming to improve the electrochemical performance of silicon-carbon composite anode materials such as cycle performance and rate performance

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  • A kind of silicon-carbon composite negative electrode material and its preparation method and application

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Embodiment 1

[0077] Use melamine as the precursor, place it in a muffle furnace, raise the temperature to 500°C at a rate of 2°C in an air atmosphere, keep it warm for 2 hours, and obtain a light yellow block-like material after primary sintering after cooling; The material continues to heat up to 550°C at a rate of 2°C under the air atmosphere in the muffle furnace, and is kept for 4 hours. After cooling, a white thin-layered material after secondary sintering is obtained; the material after secondary sintering is 0.1g / The amount of 100mL is evenly dispersed in the reaction solution composed of ammonia water, deionized water, organic dispersion (ethanol) and CTAB (wherein the volume ratio of ammonia water, deionized water and ethanol is 1:50:15, and the amount of CTAB added is 0.2g / 100mL), then slowly add tetraethyl orthosilicate, the addition amount is 5v.t.% (based on the reaction liquid system, the following cases, unless otherwise stated, the addition amount of silicate is based on t...

Embodiment 2

[0081] Use melamine as the precursor, place it in a muffle furnace, raise the temperature to 450°C at a rate of 1°C in an air atmosphere, keep it warm for 3 hours, and obtain a light yellow block-like material after primary sintering after cooling; The material continues to be heated to 500°C at a rate of 1°C under the air atmosphere in the muffle furnace, and is kept for 6 hours. After cooling, a white thin-layered material after secondary sintering is obtained; the material after secondary sintering is 0.05g / The amount of 100mL is evenly dispersed in the reaction solution composed of ammonia water, deionized water, organic dispersion (ethanol) and CTAB, wherein the volume ratio of ammonia water, deionized water and ethanol is 1:70:10, and the amount of CTAB added is 0.3 g / 100mL, then slowly add tetraethyl orthosilicate in an amount of 5v.t.%, react at 50°C for 24 hours, wash the product repeatedly with ethanol and deionized water, and dry at 80°C to obtain a silicon-carbon c...

Embodiment 3

[0084] Use melamine as the precursor, place it in a muffle furnace, raise the temperature to 550°C at a rate of 10°C in an air atmosphere, keep it warm for 1 hour, and obtain a light yellow block-like material after primary sintering after cooling; The material continues to be heated to 600°C at a rate of 10°C in the air atmosphere of the muffle furnace, and is kept for 2 hours. After cooling, a white thin-layered material after secondary sintering is obtained; the material after secondary sintering is 0.5g / The amount of 100mL is evenly dispersed in the reaction solution composed of ammonia water, deionized water, organic dispersion (ethanol) and AOT, wherein the volume ratio of ammonia water, deionized water and ethanol is 1:40:40, and the amount of AOT added is 0.1g / 100mL, then slowly add tetraethyl orthosilicate, the addition amount is 5v.t.%. After reacting at 50°C for 24 hours, the product is washed repeatedly with ethanol and deionized water, and dried at 80°C to obtain ...

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Abstract

A silicon-carbon composite negative electrode material, its preparation method and application. The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and specifically discloses a nitrogen-rich graphite nanosheet / nano-silicon composite material, including nitrogen-rich graphite nanosheets with a two-dimensional structure, and nitrogen-rich graphite nanosheets uniformly compounded in situ Nano-silicon particles on the surface. In addition, the present invention also provides the preparation of the above-mentioned material, using the CN source as the precursor, carrying out the second-stage treatment under an oxygen-containing atmosphere, and then loading silicon and mixing it with a metal reducing agent and a compound salt, and under an inert atmosphere Obtained by two-stage gradient reduction. According to the research of the present invention, thanks to the synergistic effect between the composition of the material and the morphology characteristics, the structural stability can be effectively improved, and the electrochemical performance of the material can be improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode materials, and in particular relates to a silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have high energy density, long cycle life, low self-discharge and no memory effect. They have replaced traditional batteries and occupy the main markets of consumer electronics and electric vehicles. At present, graphite is generally used as the anode material of commercial lithium-ion batteries, but its theoretical lithium storage capacity is low, and lithium precipitation is prone to occur during high-current charging and discharging, which cannot meet the needs of the development of high-performance lithium-ion batteries. As a research hotspot of new anode materials in recent years, silicon is considered to be the most promising anode material for lithium-ion batteries due to its theoretical capacit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/21C01B32/20C01B33/023C01B21/082H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01B32/21C01B32/20C01B33/023C01B21/0605H01M4/386H01M4/625H01M10/0525B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 周昊宸周向清王鹏周进辉
Owner 湖南宸宇富基新能源科技有限公司
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