锰
电化学
兴奋剂
材料科学
辅修(学术)
分析化学(期刊)
化学
冶金
电极
环境化学
物理化学
人文学科
光电子学
哲学
作者
Yingying Mi,Chen Yang,Zicheng Zuo,Liya Qi,Tang Chunxia,Weidong Zhang,Henghui Zhou
标识
DOI:10.1016/j.electacta.2015.07.060
摘要
Abstract Uniform minor Mn-doped LiFePO 4 /C cathode materials are synthesized and their electrochemical performances are investigated systematically. Via tuning the doping amount of Mn, it is found that the well crystallized LiFePO 4 /C doped with 11000 ppm Mn gives the highest discharge capacity of 165 mAh g −1 at 0.1 C at room temperature. Remarkably, it holds a quite stable cycling performance at 45 °C, with capacity retention of 97.4% after 200 cycles using a high rate of 3.0 C, and its low-temperature (−20 °C) specific capacity maintains at high up to 131.4 mAh g −1 at 0.1 C, higher than that of the majority reports. The higher or lower Mn-doping amount than 11000 ppm is found to have less positive impact on the performance of LiFePO 4 /C. Such phenomenon may be attributed to the negative cooperative effect of Mn doping, which enlarges the crystal space for improving the Li + transfer under low dose due to the large radius of Mn, but increases the charge transfer resistance and declines the performance under high dose owing to its poor intrinsic kinetics.
科研通智能强力驱动
Strongly Powered by AbleSci AI