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

To improve the electrochemical performance of LiMnPO4 cathode for lithium ion battery, many efforts focus on cation doping/substitution on Mn-site. Here we synthesize a boron doped LiMnPO4 on P-site, LiMn(P0.9B0.1O4−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 LiMnPO4. 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.