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Method for preparing lithium ion battery anode material lithium ion phosphate

A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as unsuitable industrial production, expensive LiI, etc., achieve easy product formulation, improve product purity, and cycle performance. excellent effect

Inactive Publication Date: 2006-07-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method can produce materials with excellent electrochemical properties, but the LiI used is expensive and not suitable for industrial production.

Method used

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  • Method for preparing lithium ion battery anode material lithium ion phosphate
  • Method for preparing lithium ion battery anode material lithium ion phosphate
  • Method for preparing lithium ion battery anode material lithium ion phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 0.01molFe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O and 0.01mol NH 4 h 2 PO 4 Dissolve in 500ml of deionized water respectively, after mixing the two solutions, add 4mL of 30% H 2 o 2 aqueous solution, stirring was continued for 2 hours. The resulting precipitate was filtered, washed and dried to obtain FePO 4 . 0.02molLiAc·2H 2 O, 0.01mol FePO 4 , 0.01mol ascorbic acid was mixed in 50mL ethanol, stirred and reacted for 10 hours, the solvent was volatilized at 60° C. and the obtained amorphous lithium iron phosphate precipitate was washed, and then the amorphous lithium iron phosphate precipitate was placed in a high-temperature furnace, in a mixed atmosphere ( 95%Ar+5%H 2 ), heating at a heating rate of 5°C / min, roasting at a constant temperature of 600°C for 2 hours, and then cooling to room temperature at a cooling rate of 20°C / min, to obtain lithium iron phosphate powder, a cathode material for lithium-ion batteries in crystal form. figure 1 It is an X-ray diff...

Embodiment 2

[0027] Weigh 0.01molLiAc·2H 2 O, 0.01mol FePO 4 (prepared according to Example 1), 0.005 mol of ascorbic acid was dissolved in 25 mL of ethanol, stirred and reacted for 20 hours, the solvent was evaporated at 60° C. and the obtained lithium iron phosphate precipitate was washed, and finally the lithium iron phosphate precipitate was placed in a high-temperature furnace and heated under argon gas. Raise the temperature at a heating rate of 5°C / min in the atmosphere, bake at a constant temperature of 700°C for 10 hours, and then cool to room temperature at a cooling rate of 10°C / min to obtain lithium iron phosphate powder, a cathode material for lithium-ion batteries. The discharge specific capacity of this material is about 130mAh / g.

Embodiment 3

[0029] Weigh 0.01molLiAc·2H 2 O, 0.01mol FePO 4 (prepared according to Example 1), 0.01mol ascorbic acid was dissolved in 25mL ethanol, after stirring for 20 hours, the precipitate was filtered, washed, dried, and then in a mixed atmosphere (95%Ar+5%H 2 ) at a heating rate of 5 °C / min, roasted at a constant temperature of 650 °C for 15 hours, and then cooled to room temperature at a cooling rate of 10 °C / min to obtain lithium iron phosphate powder, a cathode material for lithium-ion batteries. The discharge specific capacity of this material is about 140mAh / g.

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Abstract

The invention discloses a preparation method for ferrous lithium phosphate as anode material of lithium cell. Wherein, dissolving the ferric iron salt, lithium salt, doped phosphorus salt and reducer into dissolvant to react for 0.5-30h and obtain the amorphous ferric lithium phosphate; heating with 5-30Deg / min speed at nitrogen, argon gas or mixed atmosphere to 450-800Deg; baking for 20-600min; cooling with 1-20Deg / min speed to room temperature, and obtaining the crystal-type product. This invention reduces the ferric iron into ferrous iron and generates the final product with high specific capacity and well cycle performance. Wherein, the first charge / discharge efficiency of the product can achieve 100%.

Description

technical field [0001] The invention belongs to a method for preparing a cathode material of a lithium ion battery, in particular to a method for preparing lithium iron phosphate, an anode material of a lithium ion battery, by using a wet process. Background technique [0002] The cathode material of lithium-ion batteries is the bottleneck restricting the development of lithium-ion batteries, which determines the performance, price and development of lithium-ion batteries. Therefore, the research and development of high-performance cathode materials has become the key to the development of lithium-ion batteries. In 1997, the Goodenough research group [A.K.Padhi, K.S.Nanjundaswarmy,.B.goodenough, J.Electrochem.Soc., 144 (1997))] synthesized lithium iron phosphate for the first time, and found that using this material as a lithium-ion battery cathode material has a high The theoretical specific capacity (170mAh / g), which is larger than the commercialized LiCoO 2 The actual d...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 王保峰杨立邱亚丽
Owner SHANGHAI JIAO TONG UNIV
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