Enhanced electrochemical properties of ZnO-coated LiMnPO4 cathode materials for lithium ion batteries

Abstract

We demonstrated the effect of ZnO (different wt%)-coated LiMnPO 4 -based cathode materials for electrochemical lithium ion batteries. ZnO-coated LiMnPO 4 cathode materials were prepared by the sol-gel method. X-ray diffraction (XRD) analysis indicates that there is no change in structure caused by ZnO coating, and field emission scanning electron microscopy (FESEM) images depict the closely packed particles. Galvanostatic charge-discharge tests show the ZnOcoated LiMnPO 4 sample has an enhanced electrochemical performance as compared to pristine LiMnPO 4 . The 2 wt% of ZnO-based LiMnPO 4 exhibited maximum discharge capacity of 102.2 mAh g −1 than pristine LiMnPO 4 (86.2 mAh g −1 ) and 1 wt% of ZnO-based LiMnPO 4 (96.3 mAh g −1 ). The maximum cyclic stability of 96.3 % was observed in 2 wt% of ZnO-based LiMnPO 4 up to 100 cycles. This work exhibited a promising way to develop a surface-modified LiMnPO 4 using ZnO for enhanced electrochemical performance in device application.

Improved High Temperature Performance of a Spinel LiNi0.5Mn1.5O4 Cathode for High-Voltage Lithium-Ion Batteries by Surface Modification of a Flexible Conductive Nanolayer

“…Universally, it is proved that surface coating using some metal oxides is an appropriate strategy to surmount these deficiencies of LNMO, such as Al 2 O 3 , ZnO, , TiO 2 , Fe 2 O 3 , LaFeO 3 , Li 2 SiO 3 , Li 2 SnO 3 , LiCoO 2 , etc. The results show that these metal oxides, working as a protective layer, could avoid the undesirable interface reactions and reduce the dissolution amounts of the transition metal ions.…”

“…In particular, detrimental reactions may be expedited at elevated temperatures, 20 and it immensely obstructs the commercialized prospect of the high-voltage LNMO cathode for lithium-ion batteries. Universally, it is proved that surface coating using some metal oxides is an appropriate strategy to surmount these deficiencies of LNMO, such as Al 2 O 3 , 21 ZnO, 22,23 The results show that these metal oxides, working as a protective layer, could avoid the undesirable interface reactions and reduce the dissolution amounts of the transition metal ions. To a certain extent, these coating layers have improved the LMNO material performance.…”

Phosphorus‐Based Materials for High‐Performance Alkaline Metal Ion Batteries: Progress and Prospect

“…Besides LiFePO 4 , other phosphate-based materials such as LiMnPO 4, [121,122] LiCoPO 4, [123,124] LiNiPO 4, [125][126][127] and Li 3 V 2 (PO 4 ) 3 [128][129][130] have received research attention due to the high operating voltages that can provide higher energy densities. However, the toxicity of vanadium, high cost of cobalt, low conductivity of manganese-based materials, and high operating voltage (>4.8 V vs Li/Li + ) of nickel-based materials have hampered the commercialization of these materials.…”

Enhancement of Cycling Stability of LiMnPO4 at Elevated Temperature by Fe-Mg co-Substitution

“…During the past two decades, significant efforts have been made to improve LiMnPO 4 material [5][6][7][8][9][10][11][12]. The electrochemical performance of this material was enhanced by conductive additive coating [19][20][21][22], particle size reduction [23][24][25][26][27] and cation doping or subsitution [28][29][30][31][32][33]. Nowadays, LiMnPO 4 -based compounds can achieve nearly theoretical capacity and good high rate capability even at 10 C through optimized synthesis procedures [26][27][28].…”