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A si/cnt/graphite@c composite silicon-carbon anode material and its preparation and application

A negative electrode material, graphite technology, applied in the preparation/purification of carbon, nanotechnology for materials and surface science, silicon, etc., can solve problems such as unsatisfactory performance and chemical performance, and achieve excellent electrochemical performance. Effect

Active Publication Date: 2021-11-23
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

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problem of the unsatisfactory electrochemical performance of existing silicon-carbon materials, especially the unsatisfactory fast charging performance, the first purpose of the present invention is to provide a Si / CNT / graphite@C composite silicon with a new morphology Carbon negative electrode material (the present invention is also referred to as negative electrode active material or silicon-carbon composite material), aims to improve the capacity, rate performance, cycle performance and service life of lithium-ion batteries, especially to improve the stability of fast charging

Method used

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  • A si/cnt/graphite@c composite silicon-carbon anode material and its preparation and application
  • A si/cnt/graphite@c composite silicon-carbon anode material and its preparation and application
  • A si/cnt/graphite@c composite silicon-carbon anode material and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] 1 take 0.05gAgno 3 In an HF solution dissolved in a 50 ml concentration of 10 m, 1 g Nano-silica particles were added to the mixture and stirred for 0.5 h, and 10 ml of oxygen (30% h) was added. 2 O 2 The aqueous solution was continued for 1 h, filtered, washed, and dried in an oven at 120 ° C;

[0086] 2 The obtained porous silicon (0.8 g), 0.05 g of cobalt chloride was added to 20 ml of water, 10 ml of ethanol, stirred and dissolved, dried in an oven at 80 ° C;

[0087] 3 The resulting material (0.85 g), ball-type graphite (0.5 g), polyvinylidene fluoride (0.05 g), 0.2 g asphalt was placed in a mixer, and the mixed material was supplied into the kneader. Perform granulation;

[0088] 4 Place the material from the upper step in a nitrogen gas, vacuum, retaining the inner pressure 200Pa, heat treatment, the heat treatment temperature is 750 ° C, the holding time is 2 h;

[0089] 5 Place the above-processed material in a hydrogen gas, heat treatment under normal pressure con...

Embodiment 2

[0094] 1 take 0.05gAgno 3 In an HF solution dissolved in a 50 ml concentration of 10 m, 1 g Nano-silica particles were added to the mixture and stirred for 0.5 h, and 10 ml of oxygen (30% h) was added. 2 O 2 The aqueous solution was continued for 1 h, filtered, washed, and dried in an oven at 120 ° C;

[0095] 2 The obtained porous silicon (0.75 g; porosity is 22%), 0.1 g of iron nitrate is added to 20 ml of water, and after stirring, drying is dried in an oven at 80 ° C;

[0096] 3 The resulting material (0.85 g), petroleum coke (2 g), polypropylene (0.05 g), 0.2 g of phenolic resin were placed in the mixer, and the mixed material was supplied into the kneading machine and granulated ;

[0097] 4 Place the above-off material in a nitrogen atmosphere, vacuum, retain the inner pressure 500Pa, heat treatment, heat treatment temperature is 800 ° C, the holding time is 3 h;

[0098] 5 Place the above-proceeded material in a hydrogen gas, heat treatment under normal pressure conditions...

Embodiment 3

[0103] 1 take 0.05gAgno 3 In an HF solution dissolved in a 50 ml concentration of 10 m, 1 g Nano-silica particles were added to the mixture and stirred for 0.5 h, and 10 ml of oxygen (30% h) was added. 2 O 2 The aqueous solution was stirred for 1 h, filtered, washed, and dried in an oven at 120 ° C.

[0104] 2 The obtained porous silicon (0.85 g), 0.1 g of oxalate is added to 20 ml of water, and after stirring, drying is dried in an oven at 80 ° C;

[0105] 3 The resulting material, natural graphite (2 g), sodium alginate (0.05 g), 0.2 g of glucose were placed in a mixing machine, and the mixed material was supplied into the kneading machine and granulated;

[0106] 4 Place the above-off material in a nitrogen atmosphere, vacuum, retain the inner pressure 200Pa, heat treatment, heat treatment temperature is 600 ° C, the holding time is 4 h;

[0107] 5 Place the above-processed material in the hydrogen gas, heat treatment under normal pressure conditions, the heat treatment tempera...

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Abstract

The invention belongs to the technical field of lithium-ion battery negative electrode materials, and specifically discloses a Si / CNT / graphite@C composite silicon-carbon negative electrode material, including a core and pyrolytic carbon coated on the surface of the core; the core is Si@CNT Primary particles and secondary particles formed by aggregation of graphite; the Si@CNT primary particles include porous silicon and carbon nanotubes in-situ compounded on the surface of the porous silicon. In addition, the invention also discloses a preparation method of the material. The silicon-carbon composite material prepared by the invention can be used for fast-charging lithium-ion batteries. It has the advantages of good rate performance, good cycle stability, long service life, and controllable specific capacity. The preparation process is simple, and the source of raw materials is wide, which is suitable for large-scale production.

Description

Technical field [0001] The present invention relates to a silicone composite negative electrode for a lithium ion battery and a preparation method thereof, in particular to a fast-charged silicon carbon composite anode material and a preparation method thereof. It belongs to the technical field of composite and electrochemical technology. Background technique [0002] In order to solve the various negative problems brought about by the current fossil energy combustion, the development of new green renewable energy is imminent. Lithium-ion batteries are the most developed green feeding and discharging electrochemical power supplies. Compared to other secondary battery systems, the lithium ion battery has a significant advantage and is widely used in portable electronic devices. With people's demand for pure electric vehicles, hybrid batteries, the energy density and functional density of lithium-ion batteries are increasingly demanding. At present, it is limited to the low theoret...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525C01B32/05C01B32/162C01B32/205C01B33/02B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B33/02C01B2202/22C01B32/05C01B32/162C01B32/205H01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
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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