Three Technologies Improve Lithium Battery Cathode Material Performance!
2016-08-23
5.2 V is the highest charge and discharge voltage, because has not yet been developed to match the electrolyte, so there is no reports of LiNiPO4 anode material of lithium battery performance, reports of LiCoPO4 material more, but under the existing electrolytic liquid is concluded LiCoPO4 material circulation charge and discharge performance is poor.
Class peridot crystal structure under the condition of high voltage showed the side effects of the three: 1, the anode material can react with the electrolyte, formation of solid liquid interface layer; 2, the electrolyte will be partly dissolved Co ion, greatly deteriorated lithium battery circulation charge and discharge performance; 3, conductive performance is poor, low conductivity. Therefore, using high voltage class peridot crystal structure must impose necessary means to improve its performance, there are three kinds of these means.
1, the nano. Active substances using nano-sized particles large particles has less than a micron grade lithium ions and electrons transfer diffusion path.
2, doping. With the class spinel crystal structure can also can be doped anion of different doping cation, class peridot crystal structure only doping cation conductivity of the anode material.3, the coating. Amorphous carbon coating can form interconnected electronic high-speed transmission channel, so as to improve performance, especially the first discharge capacity and improve the charge and discharge cycle performance.
Class, in general, peridot crystal structure of LiMPO4 (M = Co, Ni) than class spinel crystal structure has more theoretical capacity, but because of the low conductivity, loop performance is poor, which makes the anode material of lithium ion battery research and development has no class spinel crystal structure of lithium ion battery research and development results, and entered the stage of theindustrialization will need to have more advanced performance improvement techniques, this mainly refers to the electric vehicle power lithium batteries.
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