Electric vehicle battery new research, carbon nanospheres can improve charge and discharge cycle stability

(Article Source: Electronic Engineering World) Currently widely used lithium ion batteries can achieve 265 WH / kg energy density and capacity of 185 mAh / g, while lithium sulfur batteries have 2,600 WH / kg energy density and capacity of 1,675 mAh / g. . In other words, the performance of the lithium sulfur battery is 10 times better than the current lithium-ion battery. The application prospect is very optimistic, but the conversion of sulfur during the charge and discharge process is slow, resulting in low utilization rate of sulfur, and is serious from the Chinese Academy of Sciences. Professor Liu Jian, a Professor of the Institute of Chemical Physics, and Professor Wu Zhongshu recently seems to have found solutions: carbon nanospheres lithium sulfur battery positive. This study was issued on April 16th International Top Journal Advanced Energy Materials (Advanced Energy Material). These nanospheres are similar to the battery cathode nano reactor, which can solve the key problems of polyulfide (LiPs) in lithium sulfur cells by FE1-XS electrocatalysts. To know that the battery is dissolved, the battery will lose Sulfur and charge and discharge cycle stability. These nanospheres have high porosity, adsorbing up to 75% high sulfur load, thereby avoiding dissolution of polysulfide. According to the researchers, the capacity of nano balls remains stable after 200 charge cycles at a current density of 0.5 C, and is almost no attenuation from the initial value of 1070 mAh / g. It is worth mentioning that electric vehicles may face a larger current density, and the fast charge can reach 4C. If scientists can prove that these carbon nanospheres can resist such high current density, the lithium sulfur battery made thereby may be 10 times higher than the current electric vehicle battery, or the battery size is less than half. But get a 5-degree mileage. In addition, lithium sulfur batteries have an unhakable cost advantage. The material used by lithium sulfur batteries is much cheaper than the lithium ion battery, and sulfur is very rich in nature. Therefore, the price is much lower than the lithium-ion battery, and it is expected to achieve 100 US dollars of the electric car to the lifeline of the lifeline. . In fact, LPP phosphate cells have recently have a gratifying development, but there is still a distance from the above-mentioned cost line. With the continuous development of battery technology, electric cars have bright future, just take a long time to finally arrive. (Editor: fqj), read full text

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