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首页> 外文期刊>Thin Solid Films >Preparation of LiFe_(1-x)Mn_xPO_4/C cathode materials at a pH of 6.5 using a hydrothermal process with high-temperature calcination
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Preparation of LiFe_(1-x)Mn_xPO_4/C cathode materials at a pH of 6.5 using a hydrothermal process with high-temperature calcination

机译：水热法高温煅烧制备pH值为6.5的LiFe_（1-x）Mn_xPO_4 / C正极材料

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摘要

In this study, manganese ion-doped lithium iron phosphate/carbon (LiFe1-xMnxPO4/C, LF1-xMxP/C) composite cathode materials with different Mn2+ doping levels (x = 0,0.03,0.05,0.07, and 0.10) were synthesized using a hydrothermal process combined with high-temperature calcination. Loss during the calcination was compensated for by using 3 at.% of excess lithium. Acetic acid or ammonium hydroxide was used to adjust the initial pH value of the hydrothermal solution to 6.5. The results revealed that the LF0.93M0.07P/C composite cathode material had the most favorable electrochemical performance and delivered the highest discharge capacities at different C-rates: 140.8 mAh/g at 0.2 C, 135.8 mAh/g at 0.5 C, 123.6 mAh/g at 1 C, 101.2 mAh/g at 3 C, 88.1 mAh/g at 5 C, and 69.5 mAh/g at 10 C. In addition, the capacity retention rate of 96.5% for LF0.93M0.07P/C after 100 cycles at 1 C-1 C was higher than the 86.5% for the pristine LiFePO4/C under the same C-rate and cycle number conditions. Moreover, the electrochemical performance of LF0.93M0.07P/C was noticeably improved by adding 1 wt% of graphene. Therefore, an appropriate amount of Mn2+ doping could effectively improve the electrochemical performance of the pristine LiFePO4/C cathode materials, particularly the electrochemical performance at a high C-rate, due to the increase in electronic and ionic transportation attributed to the addition of graphene and substitution of Mn2+ for Fe2+ in LiFePO4/C cathode materials.
机译：在这项研究中，合成了锰离子掺杂的磷酸铁锂/碳（LiFe1-xMnxPO4 / C，LF1-xMxP / C）具有不同Mn2 +掺杂水平（x = 0,0.03,0.05,0.07和0.10）的复合正极材料使用水热工艺结合高温煅烧。煅烧过程中的损失通过使用3 at。％的过量锂来补偿。使用乙酸或氢氧化铵将水热溶液的初始pH值调节至6.5。结果表明，LF0.93M0.07P / C复合阴极材料具有最佳电化学性能，并在不同C速率下具有最高放电容量：0.2 C下为140.8 mAh / g，0.5 C下为135.8 mAh / g，123.6 1 C时的mAh / g，3 C时的101.2 mAh / g，5 C时的88.1 mAh / g和10 C时的69.5 mAh / g。此外，LF0.93M0.07P / C的容量保持率为96.5％在相同的C速率和循环次数条件下，在1 C-1 C下进行100次循环后，原始LiFePO4 / C的86.5％更高。此外，通过添加1重量％的石墨烯，LF0.93M0.07P / C的电化学性能得到显着改善。因此，适当的Mn2 +掺杂量可以有效地改善原始LiFePO4 / C正极材料的电化学性能，尤其是在高C速率下的电化学性能，这归因于石墨烯和石墨烯的添加导致电子和离子传输的增加。在LiFePO4 / C正极材料中用Mn2 +代替Fe2 +。

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