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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Preparation of LiFePO4/Li3V2(PO4)(3)/C composite cathode materials and their electrochemical performance analysis
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Preparation of LiFePO4/Li3V2(PO4)(3)/C composite cathode materials and their electrochemical performance analysis

机译：LiFePO4 / Li3V2（PO4）（3）/ C复合阴极材料的制备及其电化学性能分析

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摘要

In this study, 9LiFePO(4)center dot Li3V2(PO4)(3)/C (LFVP-91/C) composite cathode materials (molar ratio of LiFePO4:Li3V2(PO4)(3) = 9:1) were prepared using a sol-gel (SG) technique and spray drying (SP) technique, followed by a calcination process at 650-750 degrees C for 10 h. Oxalic acid and citric acid were used as chelating agents, L-ascorbic acid (AA) was used as a reducing agent, and sucrose (SUC) was used as a carbon source. For improving the electrochemical properties of LFVP-91/C, different conductive carbon materials were used as carbon additives, including graphene oxide (GO), graphene nanosheet (GNS), and carbon nanotube (CNT). The experimental results show that the best discharge capacities of as-prepared SG-LFVP-91/C are approximately 151.1 mAh/g at 0.1C/0.1C, 115.2 mAh/g at 0.2C/5C, and 98.2 mAh/g at 0.2C/10C. The capacity retention after 100 cycles at 1C/1C is 84.0%. After addition of GO, the best discharge capacity retention increases to 91.66% after 100 cycles at 1C/1C. Moreover, after addition of GNS + CNT, the discharge capacity of SP-LFVP-91/C/GNS + CNT composite material increases to 160.1 mAh/g at 0.1C/0.1C, 129.3 mAh/g at 0.2C/5C, and 117.8 mAh/g at 0.2C/10C. No capacity fading is observed after 30 cycles at 0.1C/0.1C. The capacity retentions after 100 cycles and 500 cycles at 1C/1C increase to 97.58% and 85.26%, respectively. This study demonstrates that the prepared SP-LFVP-91/C/GNS + CNT composite cathode materials are excellent candidates for use in lithium-ion power batteries for electric vehicles. (C) 2020 Elsevier B.V. All rights reserved.
机译：在本研究中，使用含有9LifePO（4）中心点Li3v2（3）/ C（3）/ C（LFVP-91 / C）复合阴极材料（LiFePO4：Li3V2（PO4）（3）= 9：1的摩尔比）溶胶 - 凝胶（SG）技术和喷雾干燥（SP）技术，然后在650-750℃下进行煅烧过程10小时。使用草酸和柠檬酸作为螯合剂，使用L-抗坏血酸（AA）作为还原剂，并且使用蔗糖（SUC）作为碳源。为了改善LFVP-91 / C的电化学性质，使用不同的导电碳材料作为碳添加剂，包括石墨烯（GO），石墨烯纳米片（GNS）和碳纳米管（CNT）。实验结果表明，如制备的SG-LFVP-91 / c的最佳放电容量约为151.1mAh / g，0.1℃/ 0.1℃，115.2mAh / g为0.2℃/ 5℃，0.2的98.2mah / g C / 10c。 1C / 1C循环后的容量保留为84.0％。加入后，在1C / 1C的100个循环后，最佳放电容量保持率增加到91.66％。此外，在加入GNS + CNT后，SP-LFVP-91 / C / GNS + CNT复合材料的放电容量在0.1℃/ 0.1℃下增加至160.1mAh / g，129.3mAh / g在0.2℃/ 5℃， 117.8 mah / g为0.2℃/ 10℃。在0.1℃/ 0.1℃下30次循环后，没有观察到能力衰落。在100次循环和1℃/ 1℃下的500次循环后的容量保持分别增加到97.58％和85.26％。该研究表明，制备的SP-LFVP-91 / C / GNS + CNT复合阴极材料是用于电动车辆锂离子电池的优异候选物。 （c）2020 Elsevier B.v.保留所有权利。

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