Boron doping at P-site to improve electrochemical performance of LiMnPO4 as cathode for lithium ion battery

Abstract To improve the electrochemical performance of LiMnPO 4 cathode for lithium ion battery, many efforts focus on cation doping/substitution on Mn-site. Here we synthesize a boron doped LiMnPO 4 on P-site, LiMn(P 0.9 B 0.1 O 4− δ ), by a simple solid-state method. It is characterized by X-ray diffraction, scan electron microscopy, cyclic voltammograph, electrochemical impedance spectroscopy and capacity testing. Results show that its electrochemical performance is improved compared with the virginal LiMnPO 4 . It delivers a capacity of about 130 mAh g −1 at 0.1 C and remains 71% of the capacity at high discharge rate of 2 C. After 50 cycles at 0.2 C, there is no evident capacity fading.