This technology starts from low-cost silica nanoparticles, improves the magnesiothermic reduction technology, and prepares a silicane material with a micro-nano superstructure in the shape of hydrangea on a large scale. When it is applied to lithium-ion batteries, it exhibits excellent comprehensive lithium storage properties (ACS Nano2017, 11, 7476). On this basis, the research team proposed and developed a "skin grafting" two-dimensional covalent encapsulation strategy to prepare silicon-oxide-carbon bonded hydrange-shaped covalent diene, which showed excellent comprehensive lithium storage properties: even at a current density of 20000 mA/g, the weight specific capacity is still as high as 810 mAh g-1, and the volume specific capacity is 1358% and 1442% higher than that of non-covalent encapsulated and unencapsulated materials respectively; It is more than 40% higher than the specific energy and energy density of current commercial lithium-ion batteries.

 (This achievement was released by the Qingdao Joint Office of Technology Transfer of Universities and Institutions)