A novel method for preparation of macroposous lithium nickel manganese oxygen as cathode material for lithium ion batteries

• DOI: 10.1016/j.electacta.2010.12.108
• Publication Date: 2011-02-19T09:26:36Z
• Authors: Xiaoya Wang; Hao Hao; Jiali Liu; Tao Huang; Aishui Yu
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract A simple one-step route using gas template method is applied to synthesize macroporous LiNi 0.5 Mn 0.5 O 2 which is characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer–Emmett–Telle (BET) surface area, charge–discharge tests and electrochemical impedance spectroscopy (EIS) measurements. The as-synthesized material shows pure crystalline phase of LiNi 0.5 Mn 0.5 O 2 , while the microstructure is comprised of macrospores ranging from 0.2 to 0.5 μm. The first discharge capacity is of 174 mAh g −1 at 0.1 C rate, which is much higher than that of the material synthesized by the conventional solid state reaction method. Furthermore, the macroporous LiNi 0.5 Mn 0.5 O 2 material shows remarkable rate capacity and cycle stability, which may be attributed to the shorter lithium ion diffusion distance and better electrolyte penetration.