Silicon-carbon composite negative electrode material and preparation method and application thereof

A composite material and in-situ composite technology, applied in the direction of nanotechnology, silicon compounds, chemical instruments and methods for materials and surface science, to achieve high thermal and chemical stability, improve binding force, and solve the effect of agglomeration

Active Publication Date: 2020-12-04
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

Method used

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  • Silicon-carbon composite negative electrode material and preparation method and application thereof
  • Silicon-carbon composite negative electrode material and preparation method and application thereof
  • Silicon-carbon composite negative electrode material and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0077] Using melamine as the precursor, it was placed in a muffle furnace, and in an air atmosphere, the temperature was raised to 500 °C at a rate of 2 °C, and the temperature was maintained for 2 hours. After cooling, a pale yellow bulk material after primary sintering was obtained; Continue to raise the temperature to 550°C at a rate of 2°C under the air atmosphere in the muffle furnace, keep the temperature for 4 hours, and obtain a white thin-layered material after secondary sintering after cooling; The amount of 100mL is uniformly dispersed in the reaction solution composed of ammonia water, deionized water, organic dispersion liquid (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), and then slowly add ethyl orthosilicate in an amount of 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] Using melamine as the precursor, it was placed in a muffle furnace, and in an air atmosphere, the temperature was raised to 450°C at a rate of 1°C, and the temperature was maintained for 3 hours. After cooling, a pale yellow bulk material was obtained after primary sintering; materials, continue to heat up to 500 ℃ at a rate of 1 ℃ under the air atmosphere in the muffle furnace, keep for 6 hours, and obtain white thin-layered materials after secondary sintering after cooling; The amount of 100mL is uniformly dispersed in the reaction solution composed of ammonia water, deionized water, organic dispersion liquid (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 ethyl orthosilicate in an amount of 5 v.t.%. After reacting at 50 °C for 24 hours, the product was repeatedly washed with ethanol and deionized water, and dried at 80 °C to obtain a silicon-carbon compo...

Embodiment 3

[0084] Using melamine as the precursor, it was placed in a muffle furnace, and in an air atmosphere, the temperature was raised to 550°C at a rate of 10°C, and kept for 1 hour. After cooling, a pale yellow bulk material after primary sintering was obtained; materials, continue to heat up to 600 ℃ at a rate of 10 ℃ under the air atmosphere in the muffle furnace, keep for 2 hours, and obtain a white thin-layered material after secondary sintering after cooling; The amount of 100mL is evenly dispersed in the reaction solution composed of ammonia water, deionized water, organic dispersion liquid (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 ethyl orthosilicate, the addition amount is 5v.t.%, after 24 hours of reaction at 50 °C, the product is repeatedly washed with ethanol and deionized water, and dried at 80 °C to obtain a silicon-carbon composite precursor. The sil...

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Abstract

The invention discloses a silicon-carbon composite negative electrode material and a preparation method and application thereof. The invention belongs to the technical field of lithium ion battery negative electrode materials, and particularly discloses a nitrogen-rich graphite nanosheet / nano-silicon composite material which comprises a nitrogen-rich graphite nanosheet with a two-dimensional structure and nano-silicon particles uniformly compounded on the surface of the nitrogen-rich graphite nanosheet in situ. Besides, the invention further provides preparation of the material, a CN source isused as a precursor, two-stage treatment is performed in an oxygen-containing atmosphere, then silicon is loaded and mixed with a metal reducing agent and compound salt, and two-stage gradient reduction is performed in an inert atmosphere. Research finds that the structural stability can be effectively improved and the electrochemical performance of the material can be improved due to the synergistic effect between the components and the morphological characteristics of the material.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrode materials, and particularly relates to a silicon-carbon composite negative electrode material and a preparation method thereof. Background technique [0002] With high energy density, long cycle life, low self-discharge and no memory effect, lithium-ion batteries have replaced traditional batteries and dominated the consumer electronics and electric vehicle industries. At present, graphite is generally used as the negative electrode material for 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 advantages of ...

Claims

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Application Information

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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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