In recent years, nano-silicon-based anode materials have attracted great attention due to their high specific capacity. We have developed a low-temperature molten salt heat system, which reduces the SiCl by reduction. 4, SiO 2High-performance nano-Si composites were obtained; porous Si materials were prepared by chemical de-alloying reaction. To further alleviate the volume expansion of silicon, we obtained high-performance Si@C composite by using molten salt to thermally reduce silicon-rich biomass bamboo leaves. Materials, Si@C and Si-Ge composites were prepared by redox reaction. Si/graphene, Si/graphene/graphite composite anode materials were prepared by polymer-assisted self-assembly process.
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 by controlled pyrolysis, realizing physical limitation of sulfur fixation; using various sulfides Bonding with sulfur molecules to achieve chemical sulfur fixation; using S-Se solid solution, SP molecules can effectively inhibit sulfur dissolution.
In addition, we have studied the hybrid ion water battery (LiMnO 2 /NaTi 2(PO 4)3As a representative of clean energy, its energy density is slightly higher than that of lead-acid batteries, no pollution, fast charge and discharge, and has the potential to replace lead-acid batteries.
Summary: 1.Si. How to reduce the cost of preparing nano-silica powder, and preparing nano-silica powder, graphite and 'adhesive' amorphous carbon into a uniformly distributed Wiener structural composite material, which needs to be solved. 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 battery. The water-based ion battery uses a neutral salt solution as an electrolyte, and has high safety performance. Traditional water-based battery lead-acid batteries are more environmentally friendly (no pollution), and can replace lead-acid batteries in large energy storage technologies and electric bicycles, low-speed electric vehicles and electric buses.
