Institute of Physical and Chemical Technology, Chinese Academy of Sciences of Functional Polymer Materials Research Center developed a three-dimensional porous carbon (3DPGC) structure in situ preparation and sulfur loading method, the premise of the nano-dispersion to maintain the load reached 90%, creating The highest sulfur content of the load record, the electrode initial specific capacity of up to 1382mAhg-1; sulfur in situ load also forms a carbon-sulfur bond, after 1000 cycles, the average capacity of each cycle decay of only 0.039%, reaching the current The highest cycle stability.

Currently, the development of electric vehicles is facing a problem, that is, due to the lower quality of the battery energy density, making the batteries on the electric car big and heavy. As a result, the number of batteries installed in each EV is very limited. Tesla ModelS's battery pack, for example, is tiled on the car floor about 2 meters long and 1.2 meters wide. In the top-of-the-range models, such a large battery pack provides about 300 miles (482 kilometers) of driving range, after which it needs to be plugged in to recharge. The Nissan Leaf wind is charging only run 80 miles (128 km) or so. In addition, lithium battery charging process is much slower than the traditional car refueling.

Therefore, scientists hope to develop a new battery with a higher energy density. From the current technical point of view, the two systems with the highest theoretical energy density are lithium-sulfur batteries and lithium-air batteries. Both of these batteries have a mass energy density of more than 500 Wh / kg, which can better promote the mileage of electric vehicles.

Lithium sulfur battery is sulfur as a positive battery, lithium metal as a lithium battery, is a lithium battery. The specific capacity of up to 1675mAh / g, much higher than the commercial lithium cobalt oxide battery capacity (<150mAh / g). At the same time, sulfur is an environmentally friendly element, basically no pollution to the environment, is a very promising lithium battery. However, the sulfur has the disadvantages of nonconducting, intermediate polysulfide dissolving in electrolyte and serious volume expansion. These problems make the large-scale application of lithium-sulfur battery face many challenges, including safety, rate performance and cycle stability.

In order to overcome these problems, the Center for Functional Polymer Materials Research and Development, Institute of Physics and Chemistry, Chinese Academy of Sciences has developed a new method for the in-situ preparation and sulfur loading of 3DPGC structures. Under the premise of maintaining the nano-dispersion of sulfur, Reached 90%, creating a record of the maximum sulfur loading, the initial specific capacity of the electrode up to 1382mAhg-1; sulfur in situ load also forms a carbon-sulfur bond, significantly improve the charge-discharge cycle stability of the electrode material, after 1000 cycles , The average capacity of each cycle decay of only 0.039%, reached the current maximum cycle stability. Therefore, this material improves the sulfur load and utilization efficiency, but also improves the charge-discharge cycle stability of the electrode material.

Relevant research results published in the international journal "Nature. Communications" (NatureCommunications2016,7,10601). Subsequently, the internationally renowned carbon material scientist Professor RodneyRuoff and the Chinese University of Science and Technology Professor Ji Hengxing in the "Acta Physica Sinica" magazine highlights article (ActaPhys.Chim.Sin.2016,32,797), the above findings of innovative did an evaluation.

Previously, Nanjing University of Technology and Singapore universities to improve the lithium-sulfur battery, making the life cycle can be increased to 800 times, mileage of at least 600 km.

With the important technologies of lithium-sulfur batteries have been a breakthrough, in particular, major automobile manufacturers at home and abroad continue to increase investment in lithium batteries, the industrialization process will be further accelerated. It is estimated that the global market for lithium batteries and related industries will reach 3.1 trillion yuan annually in the next five years. Under the support of national policy, the lithium sulfur battery has a bright future. At present, China has three listed companies to test the field of lithium-sulfur batteries.

Integration into the fly: the company had interactive platform that the company graphene lithium-sulfur battery in the experimental research stage.

Investment in Tibet: a subsidiary of Shaanxi Guoneng new material products in the super capacitor, lithium-sulfur batteries and other cutting-edge technology applications.

Bao Tyrone: cooperation with Tsinghua University, including high energy lithium-sulfur battery with graphene / sulfur composite electrode material preparation.

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