Abstract
Spinel LiMn2O4-based cathode material has been successfully commercialized for power lithium ion batteries for large-scale applications in pure electric vehicles. However, pure LiMn2O4 suffers from poor rate performance and fast capacity fading especially at elevated temperatures derived from Mn dissolution and structural distortion. Herein, a study on the rate and cycle performance of single/double-cation doped porous LiMn2O4 microspheres, which was prepared by an easy method using porous MnCO3 microspheres as a self-supporting template, was performed. The as-synthesized porous Li1.02Co0.05Mn1.90Li0.05O4 (LMO-S4) microspheres constructed with nanometer-sized primary particles show an obvious enhancement of cyclability over other LiMn2O4-based materials such as Li1.02Mn2O4 (LMO-S1), Li1.02Mn1.95Li0.05O4 (LMO-S2) and Li1.02Co0.05Mn1.95O4 (LMO-S3), especially at an elevated temperature (55 °C). The obtained LMO-S4/lithium half cells deliver capacities of 113.1 and 109.0 mAh g−1 at 1.0 and 5 C, respectively, with the corresponding capacity retentions of 88.9 and 90.2% for up to 1000 cycles. Meanwhile, it can deliver an initial capacity of 114.0 mAh g−1 at 5 C with a capacity retention of 80.1% after 1000 cycles at 55 °C. Furthermore, it displays superior rate performance and cycle performance at 0 °C with a specific capacity of 106 mAh g−1, and the capacity retention is 79.6% after 1000 cycles at 5 C. These results reveal that a dual-doping strategy and porous structure design play synergistic roles in the preparation of high performance LiMn2O4-based spinel cathode material. The cation co-doped strategy can maintain the crystal structural stability and provide interfacial stability while preserving fast Li+ diffusion during the long-time cycling at elevated temperatures. Furthermore, the porous structure favors fast Li+ intercalation/deintercalation kinetics by allowing electrolyte insertion through the nanoparticles during the reversible electrochemical process.
Graphical Abstract
Lithium and cobalt co-doped LiMn2O4 with a nominal composition of Li1.02Co0.05Mn1.90Li0.05O4 exhibits an obviously improved cycle performance at high temperature than that of single-doped LiMn2O4.
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Acknowledgements
This work was supported by the Guangzhou Scientific and Technological Planning Project (201704030061), the NSFC/RGC Joint Research Scheme (Grant No. 21661162002 and N_HKUST601/16) and the linked project of Natural Science Foundation of China (U1407124) and Qinghai Province.
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Deng, Y., Wang, S., Zhou, Y. et al. The enhancement of rate and cycle performance of LiMn2O4 at elevated temperatures by the synergistic roles of porous structure and dual-cation doping. J Appl Electrochem 48, 1083–1094 (2018). https://doi.org/10.1007/s10800-018-1200-8
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DOI: https://doi.org/10.1007/s10800-018-1200-8