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A kind of composite negative electrode material and its secondary battery

A negative electrode material and secondary battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of large volume change and poor rate performance, and achieve the effect of simple and convenient process, low cost, and improved charge transfer efficiency

Active Publication Date: 2019-01-08
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, many kinds of secondary battery negative electrode materials have been newly developed, such as silicon-based materials, tin-based materials and metal alloy negative electrodes (Si, Sn, Ge, Mg, Sb, Al, Zn, etc.), these materials have the characteristics of high capacity, but These materials have the problems of large volume change during charge and discharge and poor rate performance.

Method used

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  • A kind of composite negative electrode material and its secondary battery
  • A kind of composite negative electrode material and its secondary battery
  • A kind of composite negative electrode material and its secondary battery

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preparation example Construction

[0058] Optionally, the step in the preparation method provided by the second aspect: the step of subjecting the second mixed solution to an incubation reaction to obtain a black precipitate specifically includes:

[0059] The second mixed solution was incubated at 0 to 5° C. for 1 to 24 hours and then filtered to obtain a black precipitate.

[0060] Optionally, the black precipitate is washed to neutrality and dried, the dried black precipitate is placed in a tube furnace, and the tube furnace where the black precipitate is placed is fed with The mixed gas mixture of heteroelement hydride and inert carrier gas, after sintering, obtains three-dimensional nitrogen-doped carbon materials including:

[0061] Wash the black precipitate with a hydrogen chloride solution to neutrality and dry it at 50 to 100°C for 1 to 24 hours, then place the dried black precipitate in a tube furnace, and place the black precipitate in the A mixed gas of hydride containing doping elements and inert...

Embodiment 1

[0072] Preparation of three-dimensional nitrogen-doped carbon / tin composite anode material: after pyrolysis of polymers with C-N chemical bonds in the main chain, silicon active materials are loaded on the surface by chemical deposition method to obtain three-dimensional nitrogen-doped carbon / silicon composite anode material .

[0073] Specific steps are as follows:

[0074] The first step, cetyltrimethylammonium bromide (CTAB, (C 16 h 33 )N(CH 3 ) 3 Br, 7.3 g) was dissolved in HCl (120 mL, 1 mol / L) solution in an ice-water bath, dispersed uniformly by ultrasonic, then ammonium persulfate (APS, 13.7 g) was added to it, a white suspension was formed immediately, stirred After 0.5 hours, add pyrrole monomer (Py, 8.3 mL), incubate at 0-5 °C for 24 h, then filter, wash the obtained black precipitate with 1 mol / L HCl solution three times, and then wash with pure water Until the solution was colorless and neutral, the precipitate was then dried at 80°C for 24 hours, and finally...

Embodiment 2

[0082] Preparation of three-dimensional nitrogen-doped carbon / tin composite anode materials: after pyrolysis of polymers with C-N chemical bonds in the main chain, nano-SnO is deposited on the surface by hydrothermal method 2 , to obtain a three-dimensional nitrogen-doped carbon / tin composite anode material.

[0083] Specific steps are as follows:

[0084] The first step, cetyltrimethylammonium bromide (CTAB, (C 16 h 33 )N(CH 3 ) 3 Br, 7.3 g) was dissolved in HCl (120 mL, 1 mol / L) solution in an ice-water bath, dispersed uniformly by ultrasonic, then ammonium persulfate (APS, 13.7 g) was added to it, a white suspension was formed immediately, stirred After 0.5 hours, add pyrrole monomer (Py, 8.3 mL), incubate at 0-5 °C for 24 h, then filter, wash the obtained black precipitate with 1 mol / L HCl solution three times, and then wash with pure water Until the solution was colorless and neutral, the precipitate was then dried at 80°C for 24 hours, and finally the dried precipit...

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Abstract

Embodiments of the present invention provide a composite negative electrode material, which comprises a three-dimensional nitrogen-doped carbon skeleton and a tin-based active substance loading substance, wherein the tin-based active substance loading substance is distributed on the three-dimensional nitrogen-doped carbon skeleton surface. The embodiments of the present invention further provide a preparation method of the composite negative electrode material, a lithium ion secondary battery negative electrode sheet containing the composite negative electrode material, and a lithium ion secondary battery containing a lithium ion secondary battery negative electrode active material.

Description

technical field [0001] The invention relates to the field of lithium ion secondary batteries, in particular to a composite negative electrode material and a secondary battery. Background technique [0002] The negative electrode material is one of the key materials for lithium-ion batteries. Common negative electrode materials such as graphite, but graphite has a low theoretical specific capacity (about 372 mAh / g), poor compatibility with the electrolyte, and poor rate characteristics. [0003] The current research on carbon negative electrodes is mainly to improve graphite carbon materials by various methods. In the future, the focus will be on how to make better use of cheap raw materials such as natural graphite and effectively improve them, so as to develop high energy density and high power density. graphitic carbon material. Recently, many kinds of secondary battery negative electrode materials have been newly developed, such as silicon-based materials, tin-based mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/139
CPCY02E60/10
Inventor 谢封超夏圣安李慧乔永民
Owner HUAWEI TECH CO LTD
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