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Nano-tungsten oxide-based materials have become a research hotspot in the field of anode materials for next-generation lithium-ion batteries

wallpapers News 2021-02-05
Although graphite is currently mainly used as a negative electrode material for commercial lithium-ion batteries, nano-tungsten oxide-based materials have become a research hotspot in the field of next-generation lithium-ion battery negative electrode materials.
 
It should be said that power batteries are indeed the "heart" of new energy electric vehicles-accounting for 30 to 40% of the total vehicle cost. Therefore, it is no wonder that power batteries are an emerging industry with a potential market of hundreds of billions of yuan. Speaking of power lithium-ion batteries, it is one of the current research hotspots in the energy field. Because, compared with lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries and other batteries, lithium-ion batteries have the characteristics of smaller volume, higher energy density, no memory effect, and longer service life. Moreover, it also It has environmental protection characteristics and conforms to the concept of green development.
 
At the same time, many people will think of one of the key components of lithium-ion batteries-anode materials. The quality of the negative electrode material directly affects the overall performance of the lithium-ion battery, because its function is to realize the insertion and extraction of lithium ions during the charging and discharging process (when charging, lithium ions are inserted; when discharging, lithium ions are released.).
 
Graphite and modified graphite are currently commercially available anode materials for lithium-ion batteries. Although graphite is currently mainly used as the negative electrode material for commercial lithium-ion batteries, it is undeniable that it has limited the development of lithium-ion batteries because of its low specific capacity (theoretical capacity is only 372 mAh). /g), poor rate performance.
 
Therefore, there are many kinds of anode materials for lithium-ion batteries that are in the research and development stage, such as nano-tungsten oxide-based materials in transition metal oxides—a research hotspot in the field of anode materials for next-generation lithium-ion batteries. This is because transition metal oxides such as nano-tungsten oxide-based materials have the advantages of relatively low price, wide sources, and large specific capacity. For example, purple tungsten oxide nano-powder can make lithium-ion batteries achieve ultra-fast charging and discharging because it helps electronic conductivity and lithium-ion diffusion. However, due to the large volume change of the excessive metal oxide during the process of lithium-ion extraction and insertion, it is easy to cause the electrode to rupture and the electrode material is separated from the current collector, which reduces the service life of the battery. Therefore, if you want to commercialize it, you must solve the lifespan problem. When this problem is solved in the future, the market for nano-tungsten oxide materials will further expand. At present, nano-tungsten oxide, as a functional material, has been used in the production of photocatalytic materials (degradation of organic pollutants, etc.), petroleum catalysts, electrochromic materials (smart glass), gas-sensitive materials (gas-sensitive sensors), etc..

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