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Sn-C compound electrode material and preparation method and application thereof

A technology of electrode materials and composites, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve problems such as collapsed electrodes, peeling, and sharp drop in battery capacity, and achieve good cycle stability, high energy density, and high reversible capacity. Effect

Inactive Publication Date: 2018-09-21
无锡新锂耀辉能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, previous studies have shown that the tin-based electrode will cause a huge change in the volume of the tin electrode (~300%) during the charge-discharge cycle, that is, the process of lithium ion intercalation and extraction from the electrode, resulting in the collapse of the tin material structure and Electrode peeling, pulverization, and growth of unstable SEI film lead to a sharp drop in battery capacity

Method used

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  • Sn-C compound electrode material and preparation method and application thereof
  • Sn-C compound electrode material and preparation method and application thereof
  • Sn-C compound electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Weigh SnCl 2 . 2H 2 O 2g, dissolve in 1.8g deionized water, add trace hydrochloric acid solution, then weigh 0.5g starch, dissolve in 2.5g deionized water, mix the two solutions and place them in an ultrasonic disperser for ultrasonic dispersion for 30min until the two solutions are uniform mix.

Embodiment 2

[0024] Put the uniformly mixed solution into a vacuum drying oven after suction filtration, and dry it at 100°C for 8-10 hours. After drying, put it into a tubular calciner for carbonization and reduction. o C / min heating up to 900 o C, and keep warm for 6 hours, flow Ar gas into the whole process, and naturally cool to room temperature after the end, to obtain the Sn-C composite (see figure 1 , figure 2 and image 3 ).

[0025] Take out the obtained Sn-C composite powder, conductive carbon black super P and binder PVDF and mix them in a mass ratio of 8:1:1, add an appropriate amount of organic solvent NMP to make a uniform slurry, and coat (thickness about 5 μm) On the current collector copper foil. The copper foil coated with the sample was put into a vacuum drying oven and dried in a vacuum environment for 10 hours. Take out the dried sample, punch the electrode sheet, the diameter of the electrode sheet is 13mm.

[0026] The charging and discharging performance of t...

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Abstract

The invention discloses an Sn-C compound electrode material and a preparation method and application thereof. The Sn-C compound electrode material has a complete C coating structure, the preparation method comprises the steps that SnCl2.2H2O and starch are fully dissolved in deionized water according to a certain ratio, then ultrasonic dispersion is carried out, after dispersing evenly is carriedout, vacuum drying is carried out, and lastly heat treatment is carried out in a tube furnace (argon atmosphere, 900 DEG C) to obtain an Sn-C compound. The invention further provides the application of the Sn-C compound electrode material in preparing a lithium ion battery negative electrode, the Sn-C compound electrode material has the advantages that the reversible capacity is high, the cyclingstability is good, the rate performance is good, and the scale production can be achieved.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a high-capacity, long-life and low-cost Sn-C composite electrode material, and also relates to a preparation method of the electrode material. Background technique [0002] The superior performance of lithium-ion batteries makes them have broad application prospects in portable electronic devices, electric vehicles, and aerospace. [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. Tin is considered as the most promising electrode material with a theoretical capacity as high as 994mAh / g (Li 4.4 Sn alloy), which is much higher than the theoretical specific capacity of carbon anode materials, and using it as the anode of lithium-ion batteries can greatly increase the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/136
CPCH01M4/136H01M4/362Y02E60/10
Inventor 张耀
Owner 无锡新锂耀辉能源科技有限公司
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