Guo-Zhen Wei

Crystal Habit-Tuned Nanoplate Material of Li[Li1/3-2x/3NixMn2/3-x/3]O-2 for High-Rate Performance Lithium-Ion Batteries

A cathode for high-rate performance lithium-ion batteries (LIBs) has been developed from a crystal habit-tuned nanoplate Li(Li(0.17)Ni(0.25)Mn(0.58))O₂ material, in which the proportion of (010) nanoplates (see figure) has been significantly increased. The results demonstrate that the fraction of the surface that is electrochemically active for Li(+) transportation is a key criterion for evaluating the different nanostructures of potential LIB materials.

Three-dimensional nanoarchitecture of Sn-Sb-Co alloy as an anode of lithium-ion batteries with excellent lithium storage performance

A novel nanoarchitectured Sn–Sb–Co alloy electrode is reported, which was prepared by direct electrodeposition on a Cu nanoribbon array in order to target the rapidly fading capacity and the poor rate-capability issues of Sn based materials for Li-ion batteries. The SEM images indicate a three-dimensional (3D) nanoarchitectured Sn–Sb–Co alloy with an array structure. Electrochemical measurements show that the 3D nanoarchitectured Sn54Sb41Co5 alloy electrode exhibits a reversible capacity as high as 512.8 mA h g−1 at 0.2 C (1 C = 650 mA g−1) after 150 cycles. Furthermore, the 3D nanoarchitectured Sn54Sb41Co5 anode can deliver a high reversible capacity (275 mA h g−1) up to the 80th cycle at a high discharge–charge rate of 23 C (∼15 A g−1). These outstanding electrochemical properties are attributed to the unique nanoarchitectures of the Sn54Sb41Co5 electrodes, making them an excellent anode material.