Preparation of lithium iron phosphate positive electrode material for lithium ion power cell

A technology of lithium iron phosphate and positive electrode materials, applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of potential safety hazards, flammability, and difficulty in industrial production, and achieve improved safety, stable performance, Effect of improving electrical conductivity and tap density

Inactive Publication Date: 2009-01-07
中国兵器工业第二一三研究所
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Problems solved by technology

However, this preparation method uses alcohol as a dispersant, which is easy to burn and has potential safety hazards; at the same time, this method uses microwave heating, which is not easy for industrial production

Method used

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  • Preparation of lithium iron phosphate positive electrode material for lithium ion power cell

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with preferred embodiments.

[0021] The specific process steps of the first preferred embodiment of the present invention to prepare lithium iron phosphate cathode material are:

[0022] (1) Lithium carbonate with a content of 99.5%, ammonium dihydrogen phosphate with a content of 99%, and ferrous oxalate with a content of 99% are weighed according to the material ratio of Li:P:Fe=1:1:1 , and add nanoscale titanium dioxide (TiO2) with rutile structure to the ingredients 2 ), weighing 0.2% of the total mass of the ingredient, thus constituting the adulterated ingredient;

[0023] (2) Add the doping ingredients into the SX premix ball mill, and make the mass ratio of the balls in the premix ball mill to the doping ingredients be 1.5:1, and the diameter of the balls in the SX premix ball mill is 5-7mm; then Weigh the same quality of deionized water 3 to 5 times and add it to the SX premixed b...

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Abstract

The invention discloses a preparation method of a lithium iron phosphate anode material used in a lithium-ion power battery. The preparation method takes ammonium dihydrogen phosphate and lithium carbonate or lithium hydroxide or lithium acetate and ferrous oxalate or ferrous acetate or takes the lithium dihydrogen phosphate and the ferrous oxalate or ferrous acetate as raw materials, the raw materials are prepared according to the ratio of Li, P and Fe of 1:1:1 or the ratio of LiH2PO4 to Fe of 1:1, and is added with micro amount of nano-metallic oxide or metal salt. After the process of mixing by a water wet method, spraying, drying, rolling and prilling, the mixture is pre-sintered for 10 minus or plus 2 hours at the constant temperature of 300-400 DEG C and is clad with carbon for prilling after being cooled; and then after the process of mixing by the water wet method, spraying, drying, rolling and prilling, the mixture is sintered for 10 minus or plus 2 hours at the temperature of 650-800 DEG C and then is cooled to obtain the lithium iron phosphate which is made after being crashed by gas stream and being compacted. The preparation method has the prominent advantages of safe preparation process, simple operation procedure, easy realization of industrialization and stable material performance of the product.

Description

technical field [0001] The invention belongs to the field of energy materials, and mainly relates to a positive electrode material of a lithium ion power battery, in particular to a preparation method of a lithium iron phosphate positive electrode material for a lithium ion battery. technical background [0002] Lithium-ion battery, as an environment-friendly high-performance rechargeable battery, has been used more and more in various electronic products and communication tools. Concerns about the environment and thinking about energy shortages have led people to make new plans for the future of fuel vehicles. Electric vehicles (Electric Vehicle, EV) powered by high-energy secondary batteries and hybrid electric vehicles (Hybrid Electric Vehicle, HEV) powered by fuel and batteries have received more and more attention, which proposes high-performance lithium-ion batteries. Requirements such as low cost and low cost have also promoted the research on various new electrode m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/10
Inventor 李节宾王婷王红刚
Owner 中国兵器工业第二一三研究所
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