Advances in Sustain Stable Voltage of Cr-Doped Li-Rich Layered Cathodes for Lithium Ion Batteries

作者：Song, Bohang^*; Zhou, Cuifeng; Wang, Hailong; Liu, Hongwei; Liu, Zongwen; Lai, Man On; Lu, Li

来源：Journal of the Electrochemical Society, 2014, 161(10): A1723-A1730.

DOI：10.1149/2.0461410jes

• NICKEL MANGANESE OXIDES
• RECHARGEABLE BATTERIES
• OXYGEN LOSS
• CAPACITY
• ELECTRODES
• PERFORMANCE
• DESIGN
• PHASE
• DECAY
• NI

A series of Cr doped Li-rich cathodes has been synthesized using a carbonate-assisted coprecipitation method. Structural characterization based on X-ray diffraction (XRD) data and electron dispersive X-ray spectroscopy (EDX) mapping confirms the incorporation of Cr into crystal lattice. The doped cathode can initially deliver discharge a capacity of 219 mAh.g(-1) with average voltage at 3.56 V and 170 mAh.g(-1) with 3.36 V after 133 cycles at 0.2 C. Most importantly, the incorporation of Cr into the Li-rich cathodes is found to be capable of sustaining average voltage to a certain extent, which is believed to be associated with fewer amounts of spinel-domains generated upon deep cycling. The extents of electrochemical and structural evolution as a function of various doping levels are systematically investigated by battery cycling and high-resolution transmission electron microscope (HRTEM).

• 出版日期2014
• 单位宁夏大学