Graphene's development potential in the field of lithium batteries

by:CTECHi     2021-07-27

Since the establishment of X-ray crystallography in the early 20th century, scientists have been exposed to graphene. In 1918, European scientists V.Kohlschütter and P.Haenni described the properties of graphite oxide paper in detail. In 1948, G. Ruth and F. Vogt published the first few-layer graphene (graphene with the number of layers between 3 and 10) taken with a transmission electron microscope. Graphene, known as black gold, has received worldwide attention since it won the Nobel Prize in 2010. Graphene, as the thinnest and hardest nanomaterial in the world known, has the characteristics of extremely low resistivity and extremely fast electron migration. Since the establishment of X-ray crystallography in the early 20th century, scientists have been exposed to graphene. In 1918, European scientists V.Kohlschütter and P.Haenni described the properties of graphite oxide paper in detail. In 1948, G. Ruth and F. Vogt published the first few-layer graphene (graphene with layers between 3 and 10) taken with a transmission electron microscope. Graphene battery is a new type of battery developed by using the characteristics of lithium ions to shuttle quickly and massively between the graphene surface and electrodes. The world's first graphene polymer battery was jointly developed by the Spanish Graphenano company and the University of Cordoba. Among them, Graphenano is also the world's first company to produce graphene on an industrial scale. Since then, battery companies all over the world have placed extremely high expectations on graphene and have invested heavily in research and development. From 2014 to 2018, the China International Graphene Innovation Conference was successfully held for five consecutive years, showing the world the achievements that represent the top development level of China's graphene industry, learning and absorbing the excellent development experience of the international graphene industry, and the current three common The energy density of primary lithium battery is 180-200mAh/g, while the energy density of graphene polymer battery can exceed 600mAh/g. In other words, if the battery on the Tesla P85 is replaced with a graphene battery of the same weight, its cruising range will reach about 1500km, which is three times the original. However, the production process of graphene is immature and its structure is not stable. As a result, graphene still has certain problems as a negative electrode material. For example, the first discharge efficiency is low, about 65%; cycle performance is poor; the price is higher, which is significantly higher than that of traditional graphite negative . Although graphene is widely used, rich in energy storage, and low in price, it has become the 'MSG' of modern industry. The application prospect is also very broad. However, there is still a long way to go to truly move towards the era of universal access.

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