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Preparation method for modified LiFePO4 lithium ion battery anode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of restricting large-scale industrial production, difficult to control the purity of products, and difficult to mix uniform raw materials, etc., to achieve good electrochemical performance, Good toughness and low production cost

Inactive Publication Date: 2012-02-22
HUNAN ZHONGTIAN NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation technology and process requirements of lithium iron phosphate are relatively high, and there are few countries with large-scale industrialization. At present, only a few companies have achieved mass production, mainly due to the following problems in the preparation process of lithium iron phosphate: (1 )Fe 2+ easily oxidized to Fe 3+ ; (2) low conductivity
The reported carbon source precursors mainly include glucose, lactose, fructose, sucrose and other sugars, polypropylene, polyethylene, polyvinyl alcohol, etc. The disadvantages of the above raw materials as carbon source precursors are: the price is relatively high and most of them are not available regeneration; with LiFePO 4 The precursor raw materials are not easy to mix evenly, resulting in unstable product quality; more grinding and heat treatment are required, the preparation process is complicated, and the product purity is not easy to control
These greatly limit the LiFePO 4 Large-scale industrial production of / C lithium-ion battery cathode materials

Method used

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  • Preparation method for modified LiFePO4 lithium ion battery anode material
  • Preparation method for modified LiFePO4 lithium ion battery anode material
  • Preparation method for modified LiFePO4 lithium ion battery anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 73.82 grams of ethanol solvent in the double-helix mixing mixer, while stirring, add 40.63 grams of lithium carbonate, 179.89 grams of ferrous oxalate, 115.03 grams of ammonium dihydrogen phosphate and 33.55 grams of ammonium lignosulfonate, and continue to stir for 7 hours until fully reacted, Mix evenly to generate Fe-containing 2+ 、PO 4 3- , Li + The liquid phase colloid mixture, and then vacuum-dried at 60°C; the dried material was put into a ball mill container filled with hydrogen or nitrogen atmosphere and ball milled for 5 hours, and the ball milled material was pressed into a disc shape by a powder molding machine, and pressed into shape The material is placed in an atmosphere rotary kiln sintering furnace, in a hydrogen or nitrogen atmosphere, the temperature is raised at a heating rate of 10°C / min, and roasted at a constant temperature of 400°C for 5 hours, and then heated at a heating rate of 10°C / min, and roasted at a constant temperature of 680°C for...

Embodiment 2

[0041] Add 75.03 grams of ethanol solvent to the double-helix mixer, while stirring, add 46.15 grams of lithium hydroxide, 179.89 grams of ferrous oxalate, 115.03 grams of ammonium dihydrogen phosphate and 34.11 grams of ammonium lignosulfonate, and continue to stir for 7 hours until fully reacted , mixed evenly to generate Fe-containing 2+ 、PO 4 3- , Li + The liquid phase colloid mixture, and then vacuum-dried at 60°C; the dried material was put into a ball mill container filled with hydrogen or nitrogen atmosphere and ball milled for 5 hours, and the ball milled material was pressed into a disc shape by a powder molding machine, and pressed into shape The material is placed in an atmosphere rotary kiln sintering furnace, in a hydrogen or nitrogen atmosphere, the temperature is raised at a heating rate of 10°C / min, and roasted at a constant temperature of 400°C for 5 hours, and then heated at a heating rate of 10°C / min, and roasted at a constant temperature of 680°C for 12 ...

Embodiment 3

[0043] Add 77.21 grams of ethanol solvent to the double-helix mixing mixer, while stirring, add 56.03 grams of lithium oxalate, 179.89 grams of ferrous oxalate, 115.03 grams of ammonium dihydrogen phosphate and 35.09 grams of ammonium lignosulfonate, and continue to stir for 7 hours until fully reacted, Mix evenly to generate Fe-containing 2+ 、PO 4 3- , Li + The liquid phase colloid mixture, and then vacuum-dried at 60°C; the dried material was put into a ball mill container filled with hydrogen or nitrogen atmosphere and ball milled for 5 hours, and the ball milled material was pressed into a disc shape by a powder molding machine, and pressed into shape The material is placed in an atmosphere rotary kiln sintering furnace, in a hydrogen or nitrogen atmosphere, the temperature is raised at a heating rate of 10°C / min, and roasted at a constant temperature of 400°C for 5 hours, and then heated at a heating rate of 10°C / min, and roasted at a constant temperature of 680°C for 1...

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Abstract

The invention relates to a preparation method for a modified LiFePO4 lithium ion battery anode material, which belongs to the field of lithium ion battery materials. In the process of preparing a LiFePO4 lithium ion battery cathode material, a modifier is added, and the modifier is cellulose fiber, a lignin salt or a mixture of the two. According to the invention, cheap lignin, a renewable natural high-molecular material, is used as a carbon source precursor for the LiFePO4 lithium ion battery anode material, and lignin is widely available and easy to well mix with lithium source compounds, iron source compounds and phosphor source compounds once and for all; the prepared LiFePO4 lithium ion battery anode material has high purity and good electrochemical performance; a process for the anode material is simple and is easy to control; low production cost is obtained; a lithium ion battery made of the cathode material has a stable quality and 0.2C charge-discharge reversible specific capacity higher than 157 mAh / g, and battery capacity of the prepared lithium ion battery does not attenuate after 50 times of cycle; the method is applicable to large scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, in particular to a modified lithium ion battery LiFePO 4 Cathode material. Background technique [0002] Lithium iron phosphate, a cathode material for lithium-ion batteries, has the characteristics of good safety, excellent cycle performance, environmental friendliness, and wide source of raw materials, and has become the focus of industrialization at home and abroad. However, the preparation technology and process requirements of lithium iron phosphate are relatively high, and there are few countries with large-scale industrialization. At present, only a few companies have achieved mass production, mainly due to the following problems in the preparation process of lithium iron phosphate: (1 )Fe 2+ easily oxidized to Fe 3+ ; (2) low conductivity. Recently, major breakthroughs have been made in these aspects, many new processes have been developed, and LiFePO with good performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/10
Inventor 邓凌峰李华李宫有鲁礼政王良中
Owner HUNAN ZHONGTIAN NEW ENERGY
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