With the rapid development of the market scale of portable electronic devices and electric vehicles, the demand for high energy density and low cost secondary batteries is increasingly urgent. Currently, commercial lithium-ion batteries mostly use graphite-based anode materials, which have low specific capacity and compacted density, which limits the further improvement of the energy density of lithium-ion batteries. Through the alloying /dealloying reaction with lithium ions, high-capacity anodes usually have a larger specific capacity, which is expected to obtain higher energy density. However, high-capacity anodes have a certain volume expansion during the battery reaction process, thus affect the cycle stability of the battery.
Based on the above considerations, the research team successfully developed a high-capacity anode electrode material with a hollow interface microstructure, and at the same time, integrated design of active material and current collector was applied to the dual-ion battery. The interface design of the hollow microstructure limits the alloyed region to the hollow interface, thereby effectively alleviating the volume expansion of the high-capacity anode during the alloying process and obtaining a highly stable SEI film. The research results show that the new battery circulates 1500 cycles at a half-hour charge and discharge rate (2C), the capacity retention rate is as high as 99%, and has excellent rate performance. The related research result "Bubble-sheet-like Interface Design with an Ultrastable Solid Electrolyte Layer for High-Performance Dual-Ion Batteries" has been published online in the material's top journal "Advanced Materials", and has been reported by the New Energy Network and other media.
New Energy Network and other media reports on related achievements
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