Drying and melting process of preparing LiMn2O4 latex as positive electrode material for lithium ion battery

Abstract

The latex drying and melting process of preparing LiMn2O4 is suitable for production of the positive pole film for power type lithium ion battery. The positive pole LiMn2O4 powder of the present invention is prepared with MnCO3 and LiCH3COO as material and through mixing in certain ratio, dopping with small amount of ions, mixing with PVDF and PVA to form emulsion, drying, smelting at 850 deg.c and powdering treatment. The battery with the positive pole of the said positive pole LiMn2O4 powder has operating potential of 3.7-4.15 V, specific capacity over 135 mA.h / g and discharge capacity over 128 mA.h / g.

Description

(1) Technical field [0001] The invention relates to LiMn, an anode material suitable for a power type lithium-ion battery 2 o 4 The preparation method belongs to the technical fields of electrochemistry, inorganic synthesis and electronic products. (2) Background technology [0002] With the development of society, rechargeable batteries are widely used in home appliances, transportation and other fields, and lithium-ion batteries are recognized as the most promising future due to their advantages such as light weight, high power, long life, no memory effect, and no pollution. One of the potential electric energy supplies. However, at present, ordinary lithium-ion batteries have high cost, high current, and poor high and low temperature performance, and are not easy to be popularized and used in electric vehicles. The preparation of positive electrode materials is one of the key technologies. Many companies and research institutions study various positive electrode materia...

AI Technical Summary

Problems solved by technology

However, at present, ordinary lithium-ion batteries have high cost, high current, and poor high and low temperature performance, and are not easy to be popularized and used in electric vehicles. The preparation of positive electrode materials is one of the key technologies. Many companies and research institutions study various positive electrode materials and preparation methods. Some materials are already mature products. According to literature reports, the developed synthetic methods include: ① high temperature solid phase method (TARASCON JM, MCKINNOM W R, COOWAR F, et al.Synthesis condition and oxygenstoichiometry effects on Li insertion into spinel LiMn 2 o 4 [J].JElectrochem Soc, 1994,141(6):1421.) ②Sol-gel method (BACH S, HENRY M, BAFFIER N, et al.SOL-gel synthesis of manganese oxides[J].State Chem, 1990 , 88: 325.) ③ hydrothermal synthesis (HUANG Haitao. BRUCE Peter G.A 4 V lithium manganese oxidecathode for rocking-chair lithium-ion cells [J]. J ElectrochemSoc, 1994, 141 (9): L 106.) ④ Rechini Method (LIU W, KOWALK, FARRINGTONK G C. Synthesis and electrochemical studies of spine phase LiMn 2 o 4 cathode material prepared by the pechini process [J]. J Electrochem Soc, 1996, 143 (3): 879.), etc., LiMn prepared by the current conventional method 2 o 4 (Lithium manganese oxide) Due to its short cycle life, low capacity, and poor high-current discharge performance, its use is limited

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