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Lithium iron phosphate/carbon composite material for power battery, and preparation method and application of lithium iron phosphate/carbon composite material

A carbon composite material, lithium iron phosphate technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor rate performance and high temperature cycle performance, and achieve the effect of alleviating side reactions and improving high temperature performance

Inactive Publication Date: 2017-03-22
BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature rate performance and high-temperature cycle performance are poor, which cannot meet the needs of practical applications.

Method used

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  • Lithium iron phosphate/carbon composite material for power battery, and preparation method and application of lithium iron phosphate/carbon composite material
  • Lithium iron phosphate/carbon composite material for power battery, and preparation method and application of lithium iron phosphate/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Mix lithium carbonate, iron phosphate, and titanium dioxide according to the molar ratio of 1.05:1:0.01, then Li:Fe:P:Ti=1.05:1:1:0.01, and add water to 40% of the total mass of the mixed material for ball milling , take out the slurry after 3 hours, dry it with a closed spray dryer, set the temperature of the air inlet to 250°C, and set the temperature of the air outlet to 90°C to obtain material A, crush the material A, control D50 to 5±1.0μm, and obtain the material B. Raise the temperature of material B at 2°C / min in an atmosphere of Ar gas, and feed methane gas at a flow rate of 5L / min. After the temperature rises to 600°C, it is kept for 15 hours to obtain material C, which is pulverized and controlled D50 is 2.0±1.0μm, get material D, put material D in N 2 In an atmosphere of gas, the temperature was raised at 10°C / min, and methane gas was introduced at a flow rate of 0.5L / min. After the temperature was raised to 750°C, it was kept for 8 hours to obtain a lithium...

Embodiment 2

[0048] Lithium hydroxide, ferrous oxalate, and phosphoric acid are mixed according to the molar ratio of 0.95:1:0.95, then Li:Fe:P=0.95:1:0.95, and 40% of the total mass of the material obtained by mixing is added with acetone for ball milling, After 3 hours, take out the slurry, dry it with a closed spray dryer, set the air inlet temperature at 220°C, and set the air outlet temperature at 70°C to obtain material A, crush material A, control D50 to 7±1.0μm, and obtain material B , put material B in N 2 Raise the temperature at 20°C / min in an air atmosphere, and feed ethylene gas at a flow rate of 0.5L / min. After the temperature rises to 700°C, keep it warm for 10 hours to obtain material C, which is pulverized, and the D50 is controlled to be 5.0±1.0μm , to get material D, put material D in N 2 In an atmosphere of gas, the temperature was raised at 5°C / min, and methane gas was introduced at a flow rate of 2L / min. After the temperature was raised to 800°C, it was kept for 3 ho...

Embodiment 3

[0050] Lithium dihydrogen phosphate, ferric oxide, and manganese acetate are mixed according to the molar ratio of 1:0.95:0.05, then Li:Fe:P:Mn=1:0.95:1:0.05, and the total mass of the material obtained by mixing Add 50% ethanol for ball milling, take out the slurry after 5 hours, and dry it with a closed spray dryer, set the air inlet temperature to 220°C, and the air outlet temperature to 70°C to obtain material A, and crush material A to control D50 to 4 ±1.0μm, to obtain material B, raise the temperature of material B at 10°C / min in the atmosphere of Ar gas, and pass in propane gas according to the flow rate of 8L / min, the temperature rises to 800°C and keep it for 3h, and obtain material C, put The material C is pulverized, and the D50 is controlled to be 2.0±1.0 μm to obtain the material D. The temperature of the material D is raised at 10°C / min under the atmosphere of Ar gas, and cyclopropane gas is passed in according to the flow rate of 10L / min, and the temperature ris...

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Abstract

The invention discloses a lithium iron phosphate / carbon composite material, and a preparation method and application thereof. The lithium iron phosphate / carbon composite material is formed by lithium iron phosphate and a complete and compact carbon film coating the surface of the lithium iron phosphate. The method comprises the steps of (1) mixing a lithium source, an iron source, a carbon source and an optional doping element source and adding a solvent for grinding and drying to obtain a precursor; (2) crushing the precursor until the particle sizes D50 are 2-8 microns; (3) carrying out roasting under the condition of introducing a gaseous organic carbon source and an inert gas to obtain a first coated product; (4) crushing the first coated product until the particle sizes D50 are 1-6 microns; and (5) carrying out roasting under the condition of introducing the gaseous organic carbon source and the inert gas to obtain a second coated product, namely the lithium iron phosphate / carbon composite material. Through coordination of process steps and control of parameters, the complete and compact carbon film can be formed on the surfaces of lithium iron phosphate particles, side reaction of the particles and an electrolyte is effectively relieved and the high-temperature performance of a battery is significantly improved.

Description

technical field [0001] The invention belongs to the field of electrode material synthesis, and relates to a positive electrode material, its preparation method and application, in particular to a lithium iron phosphate / carbon composite material, its preparation method and its application in power batteries. Background technique [0002] China has become the world's largest automobile producer and consumer. It is estimated that by 2030, the number of passenger cars in China will reach 250 million. However, with energy conservation and emission reduction, reducing energy dependence has gradually become the development trend of the international automobile industry and environmental protection industry, coupled with the pressure from rising oil prices on the automobile industry, the Chinese government has formulated corresponding energy conservation and new energy vehicle development in recent years. strategy. As an important part of the development of alternative energy and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/628H01M10/0525H01M2220/20Y02E60/10
Inventor 席小兵张怀文赵玉萌庞钧友黄友元
Owner BTR (TIANJIN) NANO MATERIAL MFG CO LTD
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