Nano silicon alloy based composite negative pole material and preparation method thereof

A technology of negative electrode material and alloy material, which is applied in the field of nano-silicon alloy-based composite negative electrode material and its preparation, can solve the problem of battery cycle performance decline and the like, achieves damage prevention, simple and easy method, good cycle performance and high current discharge capacity Effect

Active Publication Date: 2016-10-26
威海南海碳材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the deficiencies of the prior art, the present invention proposes a nano-silicon alloy-based composite negative electrode material to solve the problem in the prior art that the silicon-containing negative electrode material is easy to expand and cause the battery cycle performance to decline

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) According to the nano-silicon alloy as Si 1 sn0.5 Ni 0.1 The ratio of each atom, the raw material powders of Si, Sn, M and ball milling beads are added to the ball mill, and the inert gas is introduced into the ball mill to form a nano-silicon alloy material. The ball milling time is 80h, and the ball milling speed is 800rpm;

[0030] (2) Mix the nano-silicon alloy material and nano-carbon material obtained in step (1) with a mass ratio of 1:1 and add them to an ultrasonic machine, add a polyvinyl alcohol solution with a concentration of 10 mM / L, and ultrasonically disperse for 40 minutes. Mix to form a uniformly dispersed mixed powder slurry, add the mixed powder slurry and ball milling beads to the ball mill, mill for 40 minutes, centrifuge, filter, and wash to obtain the mixture; treat the mixture at high temperature for 2 hours under a nitrogen protection atmosphere, and the reaction temperature is 900 ℃ to obtain a nano-silicon alloy coated with a nano-carbon ...

Embodiment 2

[0035] (1) According to the nano-silicon alloy as Si 2 sn 1 Zn 0.2 The ratio of each atom, the raw material powders of Si, Sn, M and ball milling beads are added to the ball mill, and the inert gas is introduced into the ball mill to form a nano-silicon alloy material. The ball milling time is 60h, and the ball milling speed is 1200rpm;

[0036] (2) Mix the nano-silicon alloy material and nano-carbon material obtained in step (1) with a mass ratio of 2:1 and add them to an ultrasonic machine, add a solution of polyvinylpyrrolidone with a concentration of 8 mM / L, and disperse them ultrasonically for 20 minutes. Mix to form a uniformly dispersed mixed powder slurry, add the mixed powder slurry and ball milling beads to the ball mill, mill for 60 minutes, centrifuge, filter, and wash to obtain the mixture; treat the mixture at high temperature for 3 hours under a nitrogen protection atmosphere, and the reaction temperature is 700 ℃ to obtain a nano-silicon alloy coated with a n...

Embodiment 3

[0041] (1) Nano silicon alloy is Si 3 sn 1 Mu 0.5 The ratio of each atom, the raw material powders of Si, Sn, M and ball milling beads are added to the ball mill, and the inert gas is introduced into the ball mill to form a nano-silicon alloy material. The ball milling time is 20h, and the ball milling speed is 1500rpm;

[0042] (2) Mix the nano-silicon alloy material and nano-carbon material obtained in step (1) with a mass ratio of 3:1 and add them to the ultrasonic machine, and add hexadecyl trimethyl chloride at a concentration of 10 mM / L Ammonium solution, ultrasonically dispersed for 20 minutes, mixed to form a uniformly dispersed mixed powder slurry, the mixed powder slurry and ball milling beads were added to the ball mill, ball milled for 50 minutes, centrifuged, filtered, and washed to obtain a mixture; the mixture was treated at high temperature under a nitrogen protection atmosphere 4 hours, the reaction temperature is 500°C, and a nano-silicon alloy coated with ...

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Abstract

The invention discloses a nano silicon alloy based composite negative pole material. The nano silicon alloy based composite negative pole material has a three-shell layer structure, wherein a core layer is a nano carbon material coated nano silicon alloy core layer, and a three-shell layer is of a three-shell layer structure and is a conductive polymer film layer which is prepared by taking Fe3O4 nano-microspheres as sacrificial templates. The invention further discloses a preparation method of the nano silicon alloy based composite negative pole material. According to the preparation method, firstly, a nano silicon alloy material is prepared by a ball milling method and is subjected to wet grinding with a nano carbon material, then, hot coating is carried out so as to form the nano carbon material coated nano silicon alloy core layer, and then, the conductive polymer film layer with the three-shell layer structure is formed on the surface of the core layer by using a sacrificial Fe3O4 microsphere template method, so that the volume expansion of the nano silicon alloy material is effectively buffered. The nano silicon alloy based composite material disclosed by the invention has the advantages of high specific capacity, excellent cycle performance and rate performance, high tap density, and the like. The preparation method of the negative pole material, provided by the invention, is simple, environmentally friendly and pollution-free.

Description

technical field [0001] The invention relates to the technical field of lithium ion negative electrode materials, in particular to a nano-silicon alloy-based composite negative electrode material and a preparation method thereof. Background technique [0002] Due to its small size and high energy density, lithium-ion secondary batteries are widely used as mainstream power sources in electronic products such as mobile communication equipment, digital cameras, and notebook computers. However, with the development needs of miniaturization, high energy, and portability of electronic appliances and the research and development of electric vehicles, there are higher requirements for the performance of lithium-ion batteries. The improvement of lithium-ion battery performance mainly depends on the improvement of energy density and cycle life of lithium-intercalated electrode materials. At present, the theoretical lithium storage capacity of graphite-based carbon anode materials widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆
Owner 威海南海碳材料有限公司
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