1 research outputs found
Low-Temperature Carbon Coating of Nanosized Li<sub>1.015</sub>Al<sub>0.06</sub>Mn<sub>1.925</sub>O<sub>4</sub> and High-Density Electrode for High-Power Li-Ion Batteries
Despite their good intrinsic rate
capability, nanosized spinel
cathode materials cannot fulfill the requirement of high electrode
density and volumetric energy density. Standard carbon coating cannot
be applied on spinel materials due to the formation of oxygen defects
during the high-temperature annealing process. To overcome these problems,
here we present a composite material consisting of agglomerated nanosized
primary particles and well-dispersed acid-treated Super P carbon black
powders, processed below 300 °C. In this structure, primary particles
provide fast lithium ion diffusion in solid state due to nanosized
diffusion distance. Furthermore, uniformly dispersed acid-treated
Super P (ASP) in secondary particle facilitates lower charge transfer
resistance and better percolation of electron. The ASPLMO material
shows superior rate capability, delivering 101 mAh g<sup>–1</sup> at 300 C-rate at 24 °C, and 75 mAh g<sup>–1</sup> at
100 C-rate at −10 °C. Even after 5000 cycles, 86 mAh g<sup>–1</sup> can be achieved at 30 C-rate at 24 °C, demonstrating
very competitive full-cell performance