Silicon nickel alloy-graphene electrode material and preparation method and application thereof

A graphene electrode and graphene technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of Si-based anode materials that cannot maintain structural integrity, electrode material pulverization, and cycle performance degradation. Excellent stability, low preparation cost, and excellent electrical conductivity

Inactive Publication Date: 2019-04-12
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large volume change (∼300%) of Si during charge and discharge, Si-based anode materials cannot maintain structural integrity during alloying and dealloying with Li.
These changes will lead to pulverization of electrode materials and a significant decrease in cycle performance

Method used

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  • Silicon nickel alloy-graphene electrode material and preparation method and application thereof
  • Silicon nickel alloy-graphene electrode material and preparation method and application thereof
  • Silicon nickel alloy-graphene electrode material and preparation method and application thereof

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Embodiment 1

[0029] 1. Preparation of a silicon-nickel alloy-graphene electrode material

[0030] The commercial silicon powder and nickel powder are ball milled at a mass ratio of 6:1. The ball mill model is QM-3SP2, the ball milling time is 8 hours, the ball material ratio is 10:1, and the speed is 450r / min. Put the silicon-nickel mixture obtained by ball milling into a φ20mm mold and put it into a spark plasma sintering furnace, apply a pressure of 3MPa to both ends of the grinding tool, and vacuumize the furnace body, and then raise the temperature to 1000°C at a rate of 100°C / min. and keep it warm for 10 minutes, then cool to room temperature to obtain a silicon-nickel alloy block.

[0031] The obtained silicon-nickel block was ball-milled with a ball-to-material ratio of 40:1, a rotational speed of 450 r / min, and a ball-milling time of 3 hours to obtain silicon-nickel alloy powder. Then the silicon-nickel alloy powder and graphene powder were ball-milled and compounded, the mass rat...

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Abstract

The invention discloses a silicon nickel alloy-graphene electrode material and preparation method and application thereof. The electrode material is a silicon nickel alloy-graphene material, wherein graphene is in full contact with silicon nickel alloy, and silicon particle wraps an intermediate phase of the silicon nickel alloy. The preparation method comprises the steps of taking silicon powderand nickel powder as raw materials, and preparing silicon nickel alloy by a plasma discharging sintering (SPS) mode; and pulverizing the silicon nickel powder, performing ball-milling and combinationwith graphene powder to obtain the silicon nickel alloy-graphene electrode material. The invention also provides application of the silicon nickel alloy-graphene electrode material in preparation of alithium ion battery negative electrode. The silicon nickel alloy-graphene electrode material has the advantages of high reversible capacity, good cycle stability and the like, and mass production canbe achieved.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, in particular to a high-capacity, long-life, low-cost silicon-nickel alloy-graphene composite electrode material and its preparation method and application. Background technique [0002] With the emergence of emerging markets such as electric vehicles (EV) and hybrid electric vehicles (HEV), there is a huge demand for lithium-ion batteries (LIB). [0003] At present, the commercial negative electrode materials are mainly graphite carbon-based carbon materials, and their maximum theoretical specific capacity is only 372mAh / g, which restricts the further improvement of lithium battery capacity. Anode materials such as Si or Sn alloys having high specific capacity have been studied. These materials can be alloyed with lithium and have much higher theoretical capacities than graphite. The use of Si is of particular interest because of its high theoretical capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 张耀朱超烨曲翊
Owner SOUTHEAST UNIV
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