Next generation Li-ion batteries with high specific energy for space application

Layered Li[Li_0.133Mn_0.467Ni_0.2Co _0.2]O₂ cathodes, with the uniform primary particle, were prepared by the PAAM(Polyacrylamide)-assisted carbonate co-precipitation method. The microstructure and electrochemical properties were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and charge-discharge tests. In comparison with the normal carbonate co-precipitation method, the capacity and cyclability were improved. The capacity was increased from and the capacity retention was from 92% to 95% after 50 cycles. The improved properties can be ascribed to the uniform primary particle distribution, less lattice parameters, the special surface layer, more defect structures and Mn³⁺ concentration. At last, the high specific energy soft-packed Li-ion cells of 240 Wh/kg with Li-rich cathode/graphite were prepared.