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Flexible cathode material of lithium ion battery and preparation method of flexible cathode material

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as electrical conductivity, achieve the effects of simple preparation method, solve the problem of volume expansion, and improve rate performance and cycle performance

Inactive Publication Date: 2017-08-11
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] In order to avoid the problems in the above-mentioned prior art, the present invention provides a flexible negative electrode material for a lithium-ion battery and a preparation method thereof, aiming at solving the conductivity and volume expansion problems of silicon nanomaterials during battery charging and discharging, Improving the rate performance and cycle performance of the battery and enabling its application in flexible lithium-ion batteries

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  • Flexible cathode material of lithium ion battery and preparation method of flexible cathode material
  • Flexible cathode material of lithium ion battery and preparation method of flexible cathode material
  • Flexible cathode material of lithium ion battery and preparation method of flexible cathode material

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Embodiment 1

[0028] This embodiment prepares the lithium-ion battery flexible negative electrode material according to the following steps:

[0029] (1) Disperse 0.07g of silicon nanoparticles (diameter 80nm) uniformly in 40mL of 0.37mg / mL graphene oxide solution, then add 0.035g of hexadecyltrimethylammonium bromide and stir well, room temperature (no more than 30°C) after ultrasonic dissolution for 1 hour, react for 5 hours, so that silicon nanoparticles are evenly distributed on the graphene oxide sheet, and Si@GO suspension is obtained;

[0030] (2) Using polyvinylidene fluoride filter membrane (0.22μm) as the filter membrane, using vacuum filtration technology (at room temperature), use a pipette gun to take 10mL of 0.37mg / mL graphene oxide solution and slowly add it to the suction cup Carry out vacuum filtration in the middle, after the solution is drained (about 8h), form one deck graphene oxide film;

[0031] Then take 7.5mL of the Si@GO suspension obtained in step (1) for vacuum ...

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Abstract

The invention discloses a flexible cathode material of a lithium ion battery and a preparation method of the flexible cathode material. The preparation method is characterized by comprising the steps of uniformly distributing silicon nano particles in a graphene oxide solution, taking an obtained Si@GO suspension as a middle layer solution, taking the graphene oxide solution as a first layer solution and a third layer solution, sequentially performing suction filtration on the three layer solutions by a vacuum suction filtration method to form a GO / Si@GO / GO sandwich structure film, and finally soaking the GO / Si@GO / GO sandwich structure film in hydroiodic acid for reduction to obtain an rGO / Si@rGO / rGO sandwich structure composite material as the flexible cathode material of the lithium ion battery. The flexible cathode material of the charging and discharging lithium ion battery effectively solves volume expansion and conductivity problems of a nano silicon material in charging and discharging processes of the battery, and a stability problem of an SEI (Solid Electrolyte Interface) film, improves the rate performance and the cycle performance of the battery, and is applicable to the flexible lithium ion battery; the preparation method is simple; and mass production can be realized.

Description

technical field [0001] The invention provides a flexible negative electrode material for a rechargeable and dischargeable lithium ion battery and a preparation method thereof. Background technique [0002] Portable smart devices are developing in the direction of wearable, foldable and high energy storage, but their dependence on flexible batteries is becoming more and more urgent. Flexible batteries are one of the indispensable devices in flexible electronic displays, next-generation integrated circuits, smart wearable devices, portable medical devices, ultra-light individual combat devices, smart helmets and virtual reality devices, which can greatly reduce the cost of portable devices. The weight also increases the shape plasticity of the device, showing that it has very broad application prospects in the fields of modern medical treatment, electronic equipment, Internet of Things, emergency energy storage equipment, and military industry. However, the current backwardne...

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/366H01M4/62Y02E60/10
Inventor 张朝峰王涛孙宗强曹骏苟富刚刘曹飞
Owner HEFEI UNIV OF TECH
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