A typical oxide of acicular violet tungsten powder metal tungsten, with unique crystal structure and particle morphology, moderate band gap, high chemical activity, large specific surface area and good thermochemical stability, etc. , suitable as one of the important additives for high-performance cobalt-free battery anode materials. From a macro point of view, compared with ordinary energy storage batteries, cobalt-free lithium-ion batteries containing purple tungsten oxide materials have the advantages of stronger battery life, longer cycle life and better charge and discharge performance.
Judging from the current market, common anode materials include graphite and silicon-based materials. The advantages of graphite anode materials include a wide range of graphite sources, relatively stable electrochemical performance, and the available energy density is close to the limit, while the disadvantages include insufficient gram capacity, low purity, poor layered structure stability, and low charge-discharge platform; silicon-based materials The advantages include low lithium intercalation potential, low atomic mass, and high energy density, while the disadvantages are large volume expansion coefficient.
Because, in order to improve the deficiencies of existing negative electrode materials, researchers often make up for the defects of materials by doping other chemical compounds or improving the original structure of materials. It is worth mentioning that the overall performance of graphite materials modified with transition metal compounds has been significantly improved. The transition metal compound may be tungsten oxide, tungsten disulfide, titanium oxide, molybdenum disulfide and the like.
Taking the acicular violet tungsten ultrafine powder as an example, due to the characteristics of acicular particle shape, small particle size and high purity, the prepared cobalt-free battery negative electrode material can accommodate more charged ions and have a wider range. ion transport channels and a more stable layered structure.
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