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Method of preparing Sn-Sb alloy material for negative electrode of lithium ion cell

A technology for lithium-ion batteries and alloy materials, which is applied in the field of preparation of SnSb alloy materials, can solve the problems of harsh process conditions, high cost, and low yield, and achieve the effects of simple preparation process, low cost, and stable cycle performance

Inactive Publication Date: 2005-10-26
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

The method has harsh process conditions, high cost and low yield

Method used

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  • Method of preparing Sn-Sb alloy material for negative electrode of lithium ion cell
  • Method of preparing Sn-Sb alloy material for negative electrode of lithium ion cell

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Embodiment 1

[0016] with SnO 2 (purity 99.9%), Sb 2 o 3 (99.9%) and activated carbon (purity > 99%) are the initial raw materials, and the molar ratio is 2:1:7. The heating rate was raised to 850°C, and the temperature was kept for 2 hours, then the power was turned off, and it was naturally cooled to room temperature. The XRD phase analysis results of the obtained sample show that the synthesized product is a single SnSb phase without any other impurity phases.

[0017] Add 10wt% conductive agent acetylene black to the synthesized material, 8wt% binder PVDF to make a slurry, evenly spread it on copper platinum, after drying, stick it into a circular pole piece, and form a test battery with metal lithium. Carry out constant current charge and discharge experiments, the charge and discharge current is 50mA / g, and the charge and discharge voltage range is controlled between 0.01-1.2V. The initial reversible capacity of the prepared SnSb negative electrode material is 700mAh / g, the specif...

Embodiment 2

[0019] with SnO 2 (purity 99.9%), Sb 2 o 3 (99.9%) and carbon powder (purity > 99%) are the initial raw materials, and the reactants are dosed in a molar ratio of 4:1:11. After the mixture is dry-mixed by ball milling, it is placed under a flowing argon atmosphere at 20 ° C. The heating rate was increased to 900°C at a rate of 1 / min, and the temperature was kept for 3 hours, then the power was turned off, and it was naturally cooled to room temperature. According to the XRD phase analysis of the obtained sample, the synthesized product is two phases of SnSb and Sn, and no other impurity phase exists.

[0020] Add 12wt% conductive agent acetylene black to the synthesized material, 8wt% binder PVDF to make a slurry, evenly spread it on copper platinum, after drying, clamp it into a circular pole piece, and form a test battery with metal lithium. Carry out constant current charge and discharge experiments, the charge and discharge current is 100mA / g, and the charge and dischar...

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Abstract

This invention provides a method for applying carbothermic method to prepare Sn Sb alloy negative material of Li ionic batteries characterizing in matching the oxide of Sn and Sb according to the Sn and Sb proportion in their generated alloy, then introducing a proper proportion of carbon powder as the reducer to get a mixture to be ground and put in N or Ar atmosphere to increase the temperature with the speed of 5-30deg.C / minute to arrive at different temperatures and keep them cut off to be cooled to the room temperature. Compared with the method of liquid phase chemical recovery and powder metallurgy, this invented method costs less, the particles of SnSb alloy powder are fine and uniform and good at crystallinity, the produced negative material has high specific capacity and stable circulation.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a preparation technology of a SnSb alloy material used for a negative electrode of a lithium-ion battery. Background technique [0002] With the rapid development of portable electronic devices, the demand for secondary batteries is increasing day by day, and at the same time, higher and higher requirements are put forward for the performance of secondary batteries. Lithium-ion batteries are the latest generation of rechargeable batteries after MH-Ni batteries since the 1990s. It has the advantages of high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect. Its application has penetrated into aerospace, military and other cutting-edge fields. [0003] At present, most commercial lithium-ion battery anode materials use carbon materials. Although this material has excellent electrochemical performance, its lithium stor...

Claims

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Application Information

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IPC IPC(8): H01M4/04
CPCY02E60/12Y02E60/10
Inventor 赵海雷尹朝丽吴恒亮仇卫华
Owner UNIV OF SCI & TECH BEIJING
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