In recent years, nano-silicon-based anode materials have attracted great attention due to their high specific capacity. We developed a low-temperature molten-salt thermal system, which obtained high-performance nano-Si composite materials by reducing SiCl4 and SiO2; porous Si materials were prepared by chemical dealloying reaction. In order to further alleviate the problem of silicon volume expansion, we used molten salt to thermally reduce the silicon-rich biomass bamboo leaves to obtain high-performance Si @ C composite materials, and prepared Si @ C and Si-Ge composite materials using redox reactions. Through the polymer-assisted self-assembly process, micro-nano structure Si / graphene, Si / graphene / graphite and other composite anode materials were prepared.
Li-S (Se) series batteries have higher energy density, but how to solve the dissolution of S is the key point. We obtained microporous carbon through controlled pyrolysis to achieve physical limitation of sulfur fixation; the use of a variety of sulfide and sulfur molecules to bond to achieve chemical sulfur fixation; the formation of S-Se solid solution, SP molecules can effectively inhibit Sulfur dissolves.
In addition, the hybrid ion water battery we studied (LiMnO2 / NaTi2 (PO4) 3) as a representative of clean energy, its energy density is slightly higher than lead-acid batteries, no pollution, fast charge and discharge speed, has the potential to replace lead-acid batteries .
Summary: 1.Si. How to reduce the cost of preparing nanometer silicon powder, and preparing nanometer silicon powder, graphite and "binder" amorphous carbon into a uniformly distributed Wiener structure composite material are problems that need to be studied and solved. 2. Li-S (Se). In addition to the dissolution of lithium sulfide, the dendrite problem of the metal negative electrode needs to be solved to ensure safety. 3. Water-based battery. The water-based ion battery uses a neutral saline solution as the electrolyte, which has high safety performance and is more environmentally friendly (non-polluting) than the traditional water-based battery lead-acid battery. Lead-acid batteries. (Professor Qian Yitai, Academician of Chinese Academy of Sciences and Professor of University of Science and Technology of China)
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