Metal doping method of lithium iron phosphate anode material

A positive electrode material, lithium iron phosphate technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low lithium ion diffusion coefficient and poor conductivity, and achieve good conductivity, high tap density and low price.

Inactive Publication Date: 2012-07-18
江苏东汛锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But LiFePO 4 The material itself still has the disadvantages of poor conductivity and low diffusion coefficient of lithium ions

Method used

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  • Metal doping method of lithium iron phosphate anode material
  • Metal doping method of lithium iron phosphate anode material
  • Metal doping method of lithium iron phosphate anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Step 1, the first grinding and mixing: first add lithium carbonate, ferrous oxalate, and ammonium dihydrogen phosphate into an ethanol dispersant with a purity greater than or equal to 95% at a molar ratio of 1.000:0.854:0.954, and then grind and mix. Grind uniformly after 1 hour, add TiO after grinding 2 And Zn(C 2 H 3 O 2 ) 2 , Lithium carbonate: TiO 2 : Zn(C 2 H 3 O 2 ) 2 The molar ratio is 1:0.02:0.02, then 7% sucrose of the mass of lithium carbonate is added, and after grinding for 1 hour, it is dried at 100°C-120°C under anaerobic conditions;

[0014] Step two, the first sintering: the material obtained by drying in step one is sintered for the first time. The method for the first sintering is to place the material obtained by drying in step one in an iron crucible and use a box-type sintering furnace. Sintering at 300℃-600℃ for 2 hours, and processing under the protection of nitrogen gas;

[0015] Step three, the second grinding and mixing: add the material sintered f...

Embodiment 2

[0020] Step 1, the first grinding and mixing: first add lithium carbonate, ferrous oxalate, and ammonium dihydrogen phosphate into an ethanol dispersant with a purity greater than or equal to 95% at a molar ratio of 1.000:0.854:0.954, and then grind and mix. Grind uniformly after 1 hour, add TiO after grinding 2 And Zn(C 2 H 3 O 2 ) 2 , Lithium carbonate: TiO 2 : Zn(C 2 H 3 O 2 ) 2 The molar ratio is 1:0.03:0.02, then 7% sucrose of the mass of lithium carbonate is added, and the grinding is continued for 1 hour, and then drying is carried out at 100°C-120°C under anaerobic conditions;

[0021] Step two, the first sintering: the material obtained by drying in step one is sintered for the first time. The method for the first sintering is to place the material obtained by drying in step one in an iron crucible and use a box-type sintering furnace. Sintering at 300℃-600℃ for 2 hours, and processing under the protection of nitrogen gas;

[0022] Step three, the second grinding and mixin...

Embodiment 3

[0027] Step 1, the first grinding and mixing: first add lithium carbonate, ferrous oxalate, and ammonium dihydrogen phosphate into an ethanol dispersant with a purity greater than or equal to 95% at a molar ratio of 1.000:0.854:0.954, and then grind and mix. Grind uniformly after 1 hour, add TiO after grinding 2 And Zn(C 2 H 3 O 2 ) 2 , Lithium carbonate: TiO 2 : Zn(C 2 H 3 O 2 ) 2 The molar ratio is 1:0.04:0.02, then 7% sucrose of the mass of lithium carbonate is added, and after grinding for 1 hour, it is dried at 100°C-120°C under anaerobic conditions;

[0028] Step two, the first sintering: the material obtained by drying in step one is sintered for the first time. The method for the first sintering is to place the material obtained by drying in step one in an iron crucible and use a box-type sintering furnace. Sintering at 300℃-600℃ for 2 hours, and processing under the protection of nitrogen gas;

[0029] Step three, the second grinding and mixing: add the material sintered f...

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Abstract

The invention discloses a metal doping method of a lithium iron phosphate anode material. The method comprises the following steps of: (1) first grinding and mixing; (2) first sintering: carrying out first sintering on a dried material obtained in the step (1), wherein the sintering temperature is 300-600 DEG C; (3) second grinding and mixing: adding the material obtained after the first sintering in the step (2) to an ethanol dispersing agent with purity of not less than 85%; carrying out the second grinding and mixing in a grinding machine; adding a carbon source compound, which accounts for 20% of the mass of a Li source compound in the step (1) to the grinder; and continuing to grind the mixture for 2 hours; and then drying the mixture under an oxygen free condition at 100-120 DEG C so as to finish the second adding of the carbon source compound; (4) second sintering: carrying out the second sintering on the dried material obtained in the step (3); and (5) third sintering: carrying out the third sintering on the sintered material obtained in the step (4) so as to obtain Zn and Ti doped lithium iron phosphate anode material.

Description

Technical field [0001] The invention relates to a metal doping method for lithium iron phosphate cathode materials. Background technique [0002] With the increasing pressure of human beings on environmental pollution and the limitation of primary energy, there is an urgent need for high-energy, low-polluting, sustainable green new energy. [0003] Since the commercialization of lithium-ion batteries in the 1980s, people have noticed its potential as a new energy source for sustainable development. However, due to the high price of the main raw materials of the original lithium-ion batteries and the immature production process, it has restricted Its development. At the same time, urban automobile exhaust has become the first major factor in urban environmental pollution. As a pollution-free new energy-powered electric vehicle, it has become the main method to solve automobile pollution. The power source of electric vehicles is mainly lithium-ion batteries, while lithium iron phos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李东南
Owner 江苏东汛锂业有限公司
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