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Mesoporous silicon-tin composite electrode material and preparation method thereof, and application thereof

An electrode material, mesoporous silicon technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor high-rate discharge capability, capacity fading, poor conductivity of porous silicon, etc., and achieve high-rate discharge capability and high reversible capacity , good cycle stability

Inactive Publication Date: 2019-04-05
包头市石墨烯材料研究院有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to solve the problems of poor electrical conductivity of porous silicon, poor high-rate discharge capability, and serious capacity decline after multiple cycles in the prior art, the present invention provides a mesoporous silicon-tin composite electrode material , another object of the present invention is to provide its preparation method and application

Method used

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  • Mesoporous silicon-tin composite electrode material and preparation method thereof, and application thereof
  • Mesoporous silicon-tin composite electrode material and preparation method thereof, and application thereof
  • Mesoporous silicon-tin composite electrode material and preparation method thereof, and application thereof

Examples

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Embodiment 1

[0038] A preparation method of a mesoporous silicon-tin composite electrode material is as follows:

[0039] Grind and mix the magnesium powder with a particle size of 325 mesh and the mesoporous silica powder at a mass ratio of 1:1, and take 0.5 g of the mixed powder. Put the powder mixture into a quartz boat, put it into a tube furnace, and raise the temperature to 700°C at a rate of 1°C / min under an argon atmosphere, keep it warm for 5 hours, and cool down with the furnace. Take out the sample in the tube furnace, wash it with 1M HCl solution and 10% HF solution respectively, and the obtained material is the mesoporous silicon material (see figure 1 , figure 2 ).

[0040] The volume ratio of ethanol: deionized water is 1:3 to prepare the mixed solution, then add SnCl 4 ·6H 2 O solid, made into 100g / L concentration of SnCl 4 solution. Pour an appropriate amount of mesoporous silicon (30-50mg added) into 10ml SnCl 4solution, ultrasonic vibration for 60min. After suct...

Embodiment 2

[0047] The charging and discharging performance of the sample in Example 1 was tested on Xinwei charging and discharging equipment. The electrochemical test was carried out in a 2032-type coin cell system, and the electrolyte was 1M LiPF 6 Dissolve in EC / DEC (ethylene carbonate / diethyl carbonate, volume ratio 1:1) solution with 2% VC (vinylene carbonate) added, and the counter electrode is metal lithium sheet. Connect the above-mentioned button battery to Xinwei equipment, and conduct a rate charge and discharge test at room temperature. The specific process is to first discharge to the cut-off potential of 0.01V at a current density of 200mA / g (vs.Li / Li + ), after standing for 2min, then charged to the cut-off potential of 3.0V (vs.Li / Li + ), loop ten times. After that, the current density is changed to 500, 1000, 2000mA / g, and finally returned to 200mA / g. The current density of each level is cycled ten times to obtain the rate performance (see Image 6 ). Sn-Si composit...

Embodiment 3

[0049] The electrochemical impedance spectrum of the sample was tested by the CHI604E electrochemical comprehensive tester of Shanghai Chenhua Instrument Co., Ltd., and the test frequency was from 100kHz to 1Hz to obtain the AC impedance spectrum (see Figure 7 ). The charge transfer resistance of mesoporous silicon is 835.6Ω, and that of mesoporous silicon-tin composite is 117.68Ω.

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Abstract

The invention discloses a mesoporous silicon-tin composite electrode material and a preparation method thereof, and application thereof. The mesoporous silicon-tin composite electrode material has a pore structure of 5 to 40 nm, and the mass fraction of tin accounts for 5 to 20%. The preparation method comprises the steps of: preparing a mesoporous silicon by a magnesium thermal reaction of a mixture of magnesium powder and mesoporous silica; and preparing a mesoporous silicon-tin composite by employing a dipping hydrogen reduction method. The invention also provides the application of the mesoporous silicon-tin composite electrode material in the preparation of the lithium ion battery negative electrode. The mesoporous silicon-tin composite electrode material is high in reversible capacity, good in cycle stability and good in rate performance and can perform large-scale production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and in particular relates to a high-capacity, long-life, low-cost mesoporous silicon-tin 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 still 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. Silicon is considered to be the most promising electrode material with a theoretical capacity as high as 4200mAh / g (Li 4.4 Si alloy). In addition, the lithiation platform voltage of silicon electrodes is higher than that of graphite electrodes, which can effectivel...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M10/0525
CPCH01M4/362H01M4/386H01M4/387H01M10/0525Y02E60/10
Inventor 马志鸿李俊利王宝英曲翊白林瑞刘智君王熇张志强
Owner 包头市石墨烯材料研究院有限责任公司
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