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High-voltage anode material for lithium ion batteries and method for preparing high-voltage anode material

A technology for lithium-ion batteries and positive electrode materials, applied in the field of high-voltage positive electrode materials and their preparation, to achieve the effects of shortening roasting time, improving electrochemical performance, and simplifying the preparation process

Inactive Publication Date: 2012-08-15
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no organic combination of the two for the preparation of LiCoPO with excellent electrochemical performance. 4 Method for High Voltage Positive Electrode Composites

Method used

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  • High-voltage anode material for lithium ion batteries and method for preparing high-voltage anode material
  • High-voltage anode material for lithium ion batteries and method for preparing high-voltage anode material
  • High-voltage anode material for lithium ion batteries and method for preparing high-voltage anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1mol cobalt oxalate, 2mol citric acid and 1mol LiH 2 PO 4 Sequentially add 650ml of deionized water, mix uniformly under electromagnetic stirring, heat at a constant temperature of 70°C while stirring, until the solution gradually forms a gel, stop heating, and dry the obtained gel at 100°C to form a dry gel. The glue was ground and mixed, and then placed in a tube furnace after tableting, and calcined at 400 °C for 8 hours in a high-purity nitrogen atmosphere. The obtained positive electrode material is pure phase lithium cobalt phosphate, and its structural composition is: LiCoPO 4 , the carbon content is 1.7%, and its initial discharge capacity is 128.0mAh / g.

Embodiment 2

[0022] 1mol lithium nitrate, 0.99mol cobalt nitrate, 0.01mol zinc acetate, 2mol citric acid and 1mol (NH 4 ) 2 HPO 4 Sequentially add 900ml of deionized water, mix uniformly under electromagnetic stirring, heat at a constant temperature of 75°C while stirring, until the solution gradually forms a gel, stop heating, and dry the obtained gel at 120°C to form a dry gel. The glue was ground and mixed uniformly, and then placed in a tube furnace after tableting, and calcined at 600 °C for 6 h in a high-purity argon atmosphere. The obtained positive electrode material has the following structural composition: LiZn 0.01 Co 0.99 PO 4 , the carbon content is 1.3%, and its initial discharge capacity is 145.6mAh / g.

Embodiment 3

[0024] 1mol LiNO 3 , 0.97mol cobalt acetate, 0.03mol zinc nitrate, 2mol citric acid and 1mol NH 4 H 2 PO 4 Sequentially add 850ml of deionized water, mix uniformly under electromagnetic stirring, heat at a constant temperature of 80°C while stirring, until the solution gradually forms a gel, stop heating, and dry the obtained gel at 150°C to form a dry gel. The glue was ground and mixed uniformly, and then placed in a tube furnace after tableting, and calcined at 800 °C for 4 h in a high-purity argon atmosphere. The obtained positive electrode material has the following structural composition: LiZn 0.03 Co 0.97 PO 4 , the carbon content is 0.6%, and its initial discharge capacity is 130.6mAh / g.

[0025] The first charge-discharge curve of the product obtained from Example 2 ( figure 1 ), it can be seen that the first discharge capacity of the sample is as high as 145.6 mAh / g.

[0026] The XRD pattern of the product obtained from Example 2 ( figure 2 ), a small amoun...

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Abstract

The invention discloses a method for preparing a high-voltage anode material for lithium ion batteries. The method includes the steps: firstly, sequentially adding a lithium source, a cobalt source, a zinc source, citric acid and a phosphorus source into deionized water according to the mole ratio of 1:1-0.97:0-0.03:2:1, continuously stirring for well mixing, heating at a constant temperature ranging from 70 DEG C to 80 DEG C, well mixing to form sol-gel and stopping heating, wherein the solid content is about 50%; secondly, drying the gel at 100-150 DEG C to obtain dry gel; and thirdly, grinding and well mixing the dry gel, tabletting, and calcining in inert gas at 400-800 DEG C for four to eight hours to obtain the high-voltage anode material. The method is low in sintering temperature, short in sintering time and simple and feasible in process. Further, LiZnxCo(1-x)PO4 / C(x=0-0.03) prepared by the method has better electrochemical performance and high primary discharge capacity.

Description

technical field [0001] The invention relates to a positive electrode material for lithium ion batteries, in particular to a high voltage positive electrode material and a preparation method thereof. Background technique [0002] With the continuous advancement of science and technology, the traditional lithium-ion battery system has been unable to meet the demand for the continuous improvement of the energy density of lithium-ion batteries in mobile devices, electric vehicles and other fields. Increasing the voltage of the cathode material can effectively improve the energy density of the battery, which is one of the main directions for the development of lithium-ion batteries. Peridot-type LiCoPO 4 As a new generation of high-voltage cathode materials, its discharge platform is 4.8V (vs Li / Li + ), with a theoretical capacity of 167mAh / g, is a promising high-voltage cathode material, but like lithium iron phosphate, pure-phase lithium cobalt phosphate has poor conductivity...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B25/45H01M4/58H01M4/62H01M4/136H01M4/1397C01B32/05
CPCY02E60/122Y02E60/10
Inventor 杨晓亮徐宁孟凡玉吴孟涛
Owner TIANJIN B&M SCI & TECH
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