Production method for tin-copper-cobalt ternary alloy cathode material of lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, electrical components, circuits, etc., can solve the problems of affecting the charge-discharge cycle stability of electrodes, unsatisfactory cycle stability performance, and damage to the structure of alloy negative electrodes, and achieve large-scale applications. value, improving cycle stability, and the effect of not easy to agglomerate

Inactive Publication Date: 2008-05-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main problem that hinders the commercialization of Sn-based alloy anode materials is that during the process of lithium ion intercalation and extraction, the volume change rate of the material is very large, which easily leads to the destruction of the structure of the alloy anode, thereby affecting the charge-discharge cycle stability of the electrode.
In this material, due to the existence of two active components, Sn and Sb, to participate in the electrode reaction, the volume ex

Method used

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  • Production method for tin-copper-cobalt ternary alloy cathode material of lithium ion battery

Examples

Experimental program
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Example Embodiment

[0020] Example 1:

[0021] Accurately weigh 1g of SnO, 0.1476g of CuO, 0.1391g of CoO, and 0.1338g of activated carbon as the initial raw materials (the molar ratio of raw materials is 4:1:1:10, which is equivalent to the atomic ratio of Sn / Cu / Co 4:1:1), After the mixture is uniformly ground, it is placed in a flowing nitrogen atmosphere and raised to 1000°C at a heating rate of 10°C / min, kept for 3 hours, then cut off the power, and naturally cooled to room temperature to obtain a tin-copper-cobalt alloy.

Example Embodiment

[0022] Example 2:

[0023] Accurately weigh 1g SnO 2 , 0.5279g CuO, 0.1065gCo 3 O 4 , And 0.2604g activated carbon as the initial raw materials (the molar ratio of raw materials is 15:15:1:49, which is equivalent to the atomic ratio of Sn / Cu / Co of 5:5:1). After grinding the mixture uniformly, place it in flowing argon In a gas atmosphere, the temperature is increased to 900°C at a heating rate of 5°C / min, and the temperature is kept for 2 hours, then the power is cut off, and the tin-copper-cobalt alloy is obtained by natural cooling to room temperature. The XRD phase analysis result of the obtained sample shows that the synthesized product is Cu 6 Sn 5 , Sn and Co 3 Sn 2 The alloy composite has no oxide impurity phase.

[0024] The synthesized material is made into slurry with 10wt% conductive agent acetylene black and 10wt% adhesive PVDF, which is evenly coated on the copper foil, and after drying, it becomes a circular pole piece. The lithium sheet is used as the negative elect...

Example Embodiment

[0025] Example 3:

[0026] Accurately weigh 1g SnO 2 , 0.2374g Cu 2 O, 0.2486g CoO, and 0.2192g carbon black are used as the initial raw materials (the molar ratio of raw materials is 4:1:2:11, which is equivalent to the atomic ratio of Sn / Cu / Co 2:1:1). In a flowing argon atmosphere, the temperature is increased to 800°C at a heating rate of 2°C / min, and the temperature is kept for 2 hours, then the power is cut off, and it is naturally cooled to room temperature to obtain a tin-copper-cobalt alloy. The XRD phase analysis result of the obtained sample shows that the synthesized product is Cu6 Sn 5 And Co 3 Sn 2 Alloy composite, without any oxide impurity phase.

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Abstract

The present invention discloses a preparation method of lithium-ion battery by Sn-Cu-Co alloy negative-pole materials, pertaining to the art of lithium-ion battery technology. The method is a carbon thermal reduction method to calculate the amount of Sn, Cu and Co oxides according to the Sn/(Cu+Co) atomic ratio of 3:1-2:3; wherein, the atomic ratio of Cu/Co is 5:1-1:5; the amount of carbon powder is calculated in terms of CO which is reduced from the oxygen in all oxides. After being evenly mixed and ground, the raw material is placed in a flowing protection atmosphere so as to rise to the required target temperature at a heating rate of 2-30 DEG C per minute and after a certain time of insulation, the temperature of the raw material declines to the room temperature with the cooling of furnace. The present invention has the advantages of low material cost, simple preparation process, less time consumption, high yield, good safety, great application value in material preparation and suitability for mass production. The Sn-Cu-Co alloy has the advantages that crystallization is higher; the inside is full of micron particles in a loose structure with a smaller surface, which are difficult to reunite in the electrode cycling process; the existence of the two non-active components Cu and Co greatly releases the volume changes in the electrode cycling process and is conducive to enhancing the stability of the electrode cycling.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation technology for preparing a lithium ion battery tin-copper-cobalt alloy negative electrode material by a carbothermal reduction method. Background technique [0002] Lithium-ion batteries are one of the high-energy batteries that can best meet the sustainable development requirements of the future society, but the capacity of its electrode materials has not been greatly improved, thus restricting the rapid development of high-energy lithium-ion batteries. At present, most commercial lithium-ion batteries use graphite materials as negative electrodes. The theoretical mass specific capacity of graphite carbon materials is 372mAh / g, and the volume specific capacity is 800mAh / mL. After people's continuous improvement, the actual carbon materials are now The specific capacity is very close to its theoretical specific capacity, so the potential for furth...

Claims

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Application Information

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IPC IPC(8): H01M4/38B22F9/20
CPCY02E60/12Y02E60/10
Inventor 赵海雷贾喜娣何见超
Owner UNIV OF SCI & TECH BEIJING
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