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Stannum oxide/stannum-carbon composite material, and preparation method and application thereof

A technology of tin oxide and composite materials, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of unobtainable cycle performance, electrode failure, etc., and achieve the effect of high capacity, less parameters, and large powder output

Inactive Publication Date: 2012-04-25
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that when a single metal Sn or Sn oxide is used as the negative electrode material of lithium-ion batteries, good cycle performance cannot be obtained due to the failure of the electrode due to the huge volume expansion of Sn.

Method used

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  • Stannum oxide/stannum-carbon composite material, and preparation method and application thereof
  • Stannum oxide/stannum-carbon composite material, and preparation method and application thereof
  • Stannum oxide/stannum-carbon composite material, and preparation method and application thereof

Examples

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preparation example Construction

[0019] The preparation of the composite materials in each embodiment of the present invention adopts the dielectric barrier discharge plasma-assisted high-energy ball milling method introduced in the patent ZL200510036231.9.

[0020] The specific steps of the dielectric barrier discharge plasma-assisted high-energy ball milling method are:

[0021] (1) Install the front cover plate and electrode rod of the ball mill, and connect the iron core in the front cover plate and the electrode rod to the positive and negative stages of the plasma power supply respectively, wherein the iron core in the electrode rod is connected to the plasma The positive pole of the power supply, the front cover is connected to the negative pole of the plasma power supply;

[0022] (2) Load grinding balls and the original powder of proportioning in the ball mill jar;

[0023] (3) Vacuumize the ball mill tank through a vacuum valve, and then fill the discharge gas medium O 2 , so that the pressure val...

Embodiment 1

[0027] After mixing the tin raw material and the graphite raw material powder, the mass ratio of the graphite raw material to the tin raw material is 0.3:1. Obtain the tin oxide / tin-carbon composite material after ball milling according to above-mentioned ball milling method, described discharge gas medium is oxygen, vacuum tightness is 0.1Mpa, the ball powder mass ratio of ball and tin-carbon mixed powder is 50: 1, ball milling time for 2.5h; then carry out the charge and discharge test according to the above battery test conditions and steps to obtain the prepared SnSnO x The / C composite material has an initial discharge capacity of 627mAhg -1 .

Embodiment 2

[0029] Preparation of SnSnO by Dielectric Barrier Discharge Plasma-Assisted Ball Milling x / C composite material, its steps are basically the same as in Example 1, except that the raw materials are proportioned according to Sn:C=1:X, wherein the value of X is X=0.5, and the ball milling time is 5h. The above-mentioned powders were made into negative electrode sheets of lithium-ion batteries, and the batteries were assembled for charge and discharge tests. Prepared SnSnO x / C composite material, its initial discharge capacity is 583mAhg -12 , the capacity remains at 320mAhg after 40 cycles -1 .

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Abstract

The invention provides a stannum oxide / stannum-carbon composite material, and a preparation method and application thereof. The preparation method comprises the following steps of: mixing stannum powder and carbon powder according to the mass ratio of 1:0.3 to 1:0.7, performing vacuumizing, charging oxygen, and performing ball-milling by adopting a dielectric barrier discharge plasma-aided high-energy ball-milling method to obtain the stannum oxide / stannum-carbon composite material which is a Sn and SnOx / C composite material, wherein oxygen pressure in a ball milling process is ensured to be 0.1 to 0.12MPa. The structure of the composite material is that: amorphous-nanocrystalline stannum oxide is coated on the surface of stannum to form a core shell structure, and the core shell structure is uniformly distributed in a graphite substrate. When used as an anode material for a lithium ion battery, the Sn and SnOx / C composite material has high capacity and high cycle performance. The preparation method is simple, high in powder yield and pollution-free.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, in particular to a tin oxide / tin-carbon composite material and a preparation method and application thereof. technical background [0002] Lithium-ion batteries have great strategic significance in the field of new energy and are a hot technology at the current stage. The selection of the negative electrode material system and its performance are one of the key factors determining the performance of the new generation of lithium-ion batteries. The capacity of traditional commercialized carbon anode materials has reached the limit, and the fundamental problem is that the theoretical capacity of carbon materials is low (372mAhg -1 ). Among the many non-carbon anode material systems that have been studied, the high-capacity metal Sn system is a lithium-ion battery anode material that has been applied and sustainably developed in a small range, and is a research hotspot for ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62
CPCY02E60/12Y02E60/10
Inventor 朱敏刘辉胡仁宗刘江文曾美琴
Owner SOUTH CHINA UNIV OF TECH
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