Lithium iron phosphate/carbon composite material preparation method
A carbon composite material, lithium iron phosphate technology, which is applied in the preparation/purification of carbon, phosphorus compounds, chemical instruments and methods, etc., can solve the problems of high energy consumption, high raw material cost, and large production investment of lithium iron phosphate materials. Achieve the effects of excellent electrochemical performance, simple and practical preparation process, and low equipment operating cost
Inactive Publication Date: 2018-07-20
CONTEMPORARY AMPEREX TECH CO
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Problems solved by technology
However, the production cost of this preparation method is relatively high, which limits its development. Specifically, it is manifested in: 1) the raw material belongs to the finely processed product in a specific field, and the bulk product in the non-chemical application field, and the raw material cost is relatively high; 2) the existing wet grinding method The energy consumption of preparing lithium iron phosphate materials is relatively high, but the production capacity is relatively low; 3) The equipment and auxiliary materials used in the existing wet grinding process are wearing parts and consumables, and the production investment is large
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Embodiment 1
[0029] Add 77.18g of fine iron powder with a D50 of 10 μm, 1.3g of manganese dioxide, 115.29g of concentrated phosphoric acid (85%), 3.86g of oxalic acid and 57.65g of deionized water into a three-necked flask in sequence, and disperse at a speed of 400rpm to obtain a suspension;
[0030] Place the three-necked bottle in an oil bath, heat it to 50°C, and acidify and reflux at this temperature for 4 hours;
[0031] Add 42.78g of lithium hydroxide monohydrate and 3.86g of maltose to the three-necked flask, disperse at 1500rpm for 1 hour, and close the cooling reflux after the reaction is over;
[0032] Stirring and evaporating the mixture to obtain a lithium iron phosphate precursor compounded by an organic carbon source;
[0033] The collected precursor was sintered at 650° C. for 4 hours, crushed and sieved to obtain a low-cost lithium iron phosphate / carbon composite material.
[0034] figure 1 It is the X-ray diffraction (XRD) figure of lithium iron phosphate / carbon composi...
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The invention discloses a lithium iron phosphate / carbon composite material preparation method, which comprises: 1) weighing iron fine powder, phosphoric acid and an acidification additive, and dispersing in deionized water; 2) heating, and carrying out an acidification reflux reaction; 3) after completing the acidification reflux reaction, adding a lithium-containing compound and an organic carbonsource, and carrying out mixing dispersing; 4) carrying out stirring evaporation on the mixture to obtain an organic carbon source composite lithium iron phosphate precursor; and 5) sintering the collected precursor, crushing, and screening to obtain the lithium iron phosphate / carbon composite material. Compared to the preparation method in the prior art, the preparation method of the present invention has the following advantages that the raw materials have characteristics of wide source and low cost, the product has advantages of good crystal structure, less impurities, uniform particle size and ideal electrochemical performance, and the method has advantages of simple and practical preparation process and low equipment operation cost, and is suitable for large-scale industrial production.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically, the invention relates to a lithium iron phosphate / carbon composite material and a preparation method thereof. Background technique [0002] As a positive electrode material for lithium-ion batteries, lithium iron phosphate material has the advantages of rich raw material sources, low price, green environmental protection, high theoretical specific capacity (about 170mAh / g), long life, safety and good thermal stability, etc., and is currently commercialized The preferred cathode material for automotive power batteries. [0003] At present, the preparation of lithium iron phosphate materials mainly uses high-energy wet grinding equipment to grind and pulverize iron orthophosphate and lithium salts, so as to realize the nanometerization of lithium iron phosphate materials. However, the production cost of this preparation method is relatively high, which limits its develop...
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Patent Timeline
Login to View More IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B25/45C01B32/05
CPCC01B25/45C01P2002/72C01P2004/03H01M4/362H01M4/5825H01M4/625H01M10/0525C01B32/05H01M4/36H01M4/58H01M4/62Y02E60/10
Inventor 陈立鹏汪龙柳娜
Owner CONTEMPORARY AMPEREX TECH CO