Production method of high-capacity high-compaction lithium iron phosphate anode material

A real lithium iron phosphate, cathode material technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of poor cycle stability, low tap density, poor thermal stability, etc., achieve regular particle distribution, improve The effect of compaction density and improved electrical conductivity

Active Publication Date: 2014-03-05
HENAN FUSEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cathode materials are an important part of lithium-ion batteries. At present, the widely used cathode materials for lithium-ion batteries include metal oxides such as LiMO with a layered structure. 2 (M=Co Ni) and spinel lithium manganese oxide (LiMn 2 o 4 ), of which lithium cobaltate (LiCoO 2 ) are expensive, resource-poor and highly toxic, lithium nickelate (LiNiO 2 ) is difficult to prepare and has poor thermal stability, LiMn 2 o 4 The capacity is low and the cycle sta

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example one

[0022] A method for producing high-capacity and high-pressure lithium iron phosphate cathode material includes the following steps:

[0023] (1) Raw meal mixing: take 500 kg of ferrous oxalate, take lithium dihydrogen phosphate at a molar ratio of lithium to iron of 1.00, and mix with a high-speed mixer for 10 minutes to mix uniformly to obtain raw meal;

[0024] (2) Tablet pressing and sintering: Nitrogen should be continuously added during the following sintering processes, and carbon dioxide should be discharged in time to ensure sufficient chemical reactions;

[0025] a. One-time tableting and sintering: use a lithium iron phosphate tableting machine to press the raw material at 150T, and use a mesh belt kiln to sinter the compressed raw material at a sintering temperature of 500°C for 12 hours;

[0026] b. Secondary tableting and sintering: The sintered lithium iron phosphate semi-finished product is crushed and crushed by a mechanical crusher. The crushing p...

Example Embodiment

[0032] Example two

[0033] A method for producing high-capacity and high-pressure lithium iron phosphate cathode material includes the following steps:

[0034] (1) Raw meal mixing: Take 500 kg of ferrous oxalate, take lithium dihydrogen phosphate at a molar ratio of lithium to iron of 1.02, and mix it with a high-speed mixer. The mixing time is 50 minutes, and the raw meal is evenly mixed;

[0035] (2) Tablet pressing and sintering: Nitrogen should be continuously added during the following sintering processes, and carbon dioxide should be discharged in time to ensure sufficient chemical reactions;

[0036] a. One-time tableting and sintering: use a lithium iron phosphate tableting machine to press the raw material at 120T, and use a mesh belt kiln to sinter the compressed raw material at a sintering temperature of 520°C for 10 hours;

[0037] b. Secondary tableting and sintering: crush the semi-finished lithium iron phosphate sintered once and crush it with a mechanical crusher. Th...

Example Embodiment

[0043] Example three

[0044] A method for producing high-capacity and high-pressure lithium iron phosphate cathode material includes the following steps:

[0045] (1) Raw meal mixing: Take 600 kg of ferrous oxalate, take lithium dihydrogen phosphate at a molar ratio of lithium to iron of 0.96, and mix it with a high-speed mixer. The mixing time is 80 minutes, and the raw meal is evenly mixed;

[0046] (2) Tablet pressing and sintering: Nitrogen should be continuously added during the following sintering processes, and carbon dioxide should be discharged in time to ensure sufficient chemical reactions;

[0047] a. One-time tableting and sintering: use lithium iron phosphate tableting machine to press the raw material at 200T pressure, and use the mesh belt kiln to perform primary sintering of the pressed material at a sintering temperature of 450°C for 12 hours;

[0048] b. Secondary tableting and sintering: the primary sintered lithium iron phosphate semi-finished product is crushed,...

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PUM

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Abstract

The invention discloses a production method of a high-capacity high-compaction lithium iron phosphate anode material. The high-capacity high-compaction lithium iron phosphate anode material is prepared by adopting a multi-time compaction and sintering method, a purpose for improving the compaction density, the electrochemical gram capacity and cycling performance of the lithium iron phosphate can be effectively realized, a lithium iron phosphate primary crystalline phase is formed through the primary sintering, titanium, magnesium and manganese crystals are fused into the lithium iron phosphate crystalline structure through the secondary doping sintering, the lithium iron phosphate nanometer crystal is completely coated with carbon through the tertiary sintering after the carbon-cladding, and the conductivity of the lithium iron phosphate monocrystal is improved. A produced lithium iron phosphate lithium-ion battery has the advantages of high charging-discharging efficiency, good cycling stability, high compaction density, large electrochemical gram capacity, good cycling performance and the like, the production cost of a power battery can be greatly reduced, and the lithium iron phosphate is enabled to be an optimal anode material for the power lithium-ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode material processing, in particular to a lithium iron phosphate (LiFePO 4 ) A method for producing a high-capacity and high-compression lithium iron phosphate cathode material by compacting and sintering the cathode material. Background technique [0002] Cathode materials are an important part of lithium-ion batteries. At present, the widely used cathode materials for lithium-ion batteries include metal oxides such as LiMO with a layered structure. 2 (M=Co Ni) and spinel lithium manganese oxide (LiMn 2 o 4 ), of which lithium cobaltate (LiCoO 2 ) are expensive, resource-poor and highly toxic, lithium nickelate (LiNiO 2 ) is difficult to prepare and has poor thermal stability, LiMn 2 o 4 The capacity is low and the cycle stability is poor. The development of high-performance and low-cost lithium-ion battery cathode materials has become a hot topic in the field of lithium-i...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45
CPCH01M4/5825H01M4/62H01M4/625Y02E60/10
Inventor 曹长城高云
Owner HENAN FUSEN NEW ENERGY TECH
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