After several years of research, materials scientists at home and abroad have indicated that graphene-based composites were prepared by compounding tungsten oxide particles and graphene anode materials to improve the shortcomings of pure graphene anode materials. Nowadays, this method has become a hot spot in the research of lithium batteries and the development direction of lithium electronegative materials.
It is believed that people in the industry know that graphene has several advantages: 1. Super large specific surface area (2630 m2/g) can reduce polarization and energy loss of batteries; 2. Good conductivity and thermal conductivity, i.e. good electronic transmission channels and stability; 3. Slice size is at the micro-nano level, much smaller than bulk graphite, which not only makes Li + diffuse between graphene sheets. The distance is shortened, and it is beneficial to Li + migration, so as to improve the battery power performance.
As the saying goes, everything is not perfect, always missing a corner. The same is true of graphene anode materials, which have some shortcomings, such as: 1. Lamellar structure is easy to collapse, resulting in reduced specific surface area and lithium storage space; 2. The first Coulomb efficiency is low, because of the characteristics of large specific surface area and rich functional groups, electrolyte decomposes on the surface of graphene; 3. The initial capacity decays rapidly.
In order to make up for the shortcomings of graphene anode materials, scientists used transition metal tungsten oxide as complementary material, that is, adding tungsten oxide to graphene. The advantages of the composites can be summarized as follows: 1) graphene can effectively avoid the agglomeration of tungsten oxide in charge-discharge cycle; 2) graphene can improve the conductivity of tungsten oxide materials; flexible and curled lamellar structure can alleviate the volume expansion during the cycle and maintain the stability of the electrode; 3) the addition of tungsten oxide can avoid the accumulation of graphene lamellae and maintain high specific surface area.
In short, tungsten oxide and graphene are good partners.
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