Method for synthesizing lithium ferrous phosphate in solution
A lithium ferrous phosphate solution technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of harsh liquid phase control conditions, avoid product impurity, avoid segregation, and reduce production costs Effect
Inactive Publication Date: 2010-04-21
TSINGHUA UNIV
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However, the liquid phase control conditions are strict
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[0029] 1) Under the protection of 1-10L / mim N2, mix 0.1mol phosphoric acid and ferric oxide at 70°C for 1 hour; then add reduced iron powder and react for 4 hours; where phosphoric acid: ferric oxide: moles of reduced iron powder Ratio = 3.05:1:1.03.
[0030] 2) Under the protection of N2, add a phenolic resin with a carbon content of 5 wt% in the lithium ferrous phosphate powder material to a lithium hydroxide solution with a concentration of 0.1 mol; react at 90° C. for 4 hours;
[0031] 3) The reaction solution is cooled to room temperature, vacuum filtered to obtain lithium iron phosphate wet material, and then dried in vacuum
[0032] Dry in an oven at 120°C for 12 hours;
[0033] 4) Under the protection of 1-10L / mim N2, heat in a tube furnace at 200°C for 3h, and sinter at 700°C for 4h to obtain lithium iron phosphate powder.
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The invention discloses a method for synthesizing lithium ferrous phosphate in a solution, which relates to an anode material of a lithium ion battery, and the method belongs to the technical field of chemical material preparation. The method comprises the following steps: reacting phosphoric acid, iron trioxide with reduced iron powder at a certain temperature, adding a lithium source and a carbon source, continuing the reaction to obtain a mixing solution, and filtering, drying and calcining the mixing solution to obtain the lithium ferrous phosphate. Compared with a synthetic method of using the reduced iron powder as an iron source, the method adopts the iron trioxide as most of iron sources so as to reduce the cost of raw materials greatly; the obtained product is uniform in component and good in batch stability, and the synthesized lithium ferrous phosphate material serving as the anode material of the lithium ion battery has the excellent electrochemistry performance; 3C multiplying power discharging specific capacity is more than 130mAh/g at room temperature; the synthesized lithium ferrous phosphate material is suitable for being used as power lithium ion batteries; and the method has short sintering period, simple production process, less energy consumption and no pollution, such as tail gas and waste liquor, and is suitable for mass industrial production.
Description
technical field [0001] The invention belongs to the technical field of chemical material preparation, and in particular relates to a method for synthesizing lithium iron phosphate in a solution of lithium iron phosphate (LFP), a cathode material of a lithium ion battery. Background technique [0002] Lithium ferrous phosphate is an emerging cathode material for lithium-ion batteries. It has the advantages of stable structure, good safety performance, abundant resources, low cost, good cycle performance, and good overcharge resistance, which is conducive to the combined use of batteries. Lithium iron phosphate power battery has the following characteristics. High-efficiency output: standard discharge is 2-5C, continuous high-current discharge can reach 10C, and instantaneous pulse discharge (10S) can reach 20C; high-temperature performance is good: when the external temperature is 65°C, the internal temperature is as high as 95°C, and the temperature at the end of battery dis...
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IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 谢晓峰杨裕生王要武尚玉明王树博王金海
Owner TSINGHUA UNIV
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