lifepo4 battery calb 200ah 3.2v.Research on volume expansion of lithium battery electrolyte

　　Currently, the development of electric vehicles is facing a problem, that is, due to the low mass energy density of the battery, the batteries on electric vehicles are large and heavy. Therefore, the number of batteries installed in each electric vehicle is very limited. For example, the battery pack of Tesla's Model S is laid flat on the car floor and is about 2 meters long and 1.2 meters wide. In top-level configuration models, such a large power battery can only provide a driving range of about 300 miles (482 kilometers), and then it needs to be plugged into a charging pile for charging. The Nissan Leaf can only run about 80 miles (128 kilometers) on a single charge. In addition, the charging process of lithium batteries is much slower than refueling of traditional cars. Therefore, scientists hope to develop a new type of battery with higher energy density. From a current technical point of view, the two systems with the highest theoretical energy density are lithium-sulfur batteries and lithium-air batteries. The mass energy density of these two types of batteries exceeds 500Wh/kg, which can significantly improve the mileage of electric vehicles. However, sulfur has shortcomings such as non-conductivity, the core product lithium polysulfide being dissolved in the electrolyte, and serious volume expansion. These problems make the large-scale use of lithium-sulfur batteries face many challenges, including safety, double duty performance and cycle stability. In order to overcome these problems, the Functional Polymer Materials Research Center of the Institute of Physics and Chemistry of the Chinese Academy of Sciences developed a new method of in-situ preparation and loading of sulfur in a three-dimensional porous carbon (3DPGC) structure. Under the premise of maintaining nanodispersion of sulfur, the loading capacity is Reaching 90%, setting a record for the highest loading of sulfur, and the initial specific capacity of the electrode is as high as 1382mAhg-1; the in-situ loading of sulfur also forms carbon-sulfur bonds, which significantly improves the charge-discharge cycle stability of the electrode material. After 1,000 cycles Finally, the average capacity attenuation per cycle was only 0.039%, reaching the current highest cycle stability. Therefore, this material not only improves the loading and utilization efficiency of sulfur, but also improves the charge and discharge cycle stability of the electrode material. Relevant research results were published in the international journal "Nature Communications" (Nature Communications 2016, 7, 10601). Subsequently, Professor Rodney Ruoff, an internationally renowned carbon material scientist, and Ji Xingxing, a professor at the University of Science and Technology of China, wrote highlight articles (ActaPhys.Chim.Sin.2016, 32,797) in the journal Acta Physics. Evaluation was held. Previously, Nanjing University of Technology cooperated with universities in Singapore to improve lithium-sulfur batteries, so that their use cycles can be increased to 800 times and their cruising range is at least 600 kilometers. As the important technologies of lithium-sulfur batteries have successively achieved breakthroughs, especially as major domestic and overseas automobile manufacturers continue to increase their investment in lithium batteries, their industrialization process will be further accelerated. It is estimated that the total annual market size of global lithium batteries and related industries will reach 3.1 trillion yuan in the next five years. With the support of national policies, lithium-sulfur batteries have a bright future. At present, my country has three listed companies testing the lithium-sulfur battery field. Chengfei Integration: The company once stated on the interactive platform that the company is in the experimental research stage of graphene lithium-sulfur batteries. Tibet Urban Investment: The products of subsidiary Shaanxi Guoneng New Materials are applied in cutting-edge technology fields such as supercapacitors and lithium-sulfur batteries. Baotailong: The cooperation project with Tsinghua University includes the preparation of graphene/sulfur composite electrode materials for high-energy lithium-sulfur batteries.

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