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Multi-core–shell-structured LiFePO4@Na3V2(PO4)3@C composite for enhanced low-temperature performance of lithium-ion batteries
Rare Metals ( IF 8.8 ) Pub Date : 2021-01-12 , DOI: 10.1007/s12598-020-01669-x Xing-Xing Gu , Shuang Qiao , Xiao-Lei Ren , Xing-Yan Liu , You-Zhou He , Xiao-Teng Liu , Tie-Feng Liu
Rare Metals ( IF 8.8 ) Pub Date : 2021-01-12 , DOI: 10.1007/s12598-020-01669-x Xing-Xing Gu , Shuang Qiao , Xiao-Lei Ren , Xing-Yan Liu , You-Zhou He , Xiao-Teng Liu , Tie-Feng Liu
In this work, a multi-core–shell-structured LiFePO4@Na3V2(PO4)3@C (LFP@NVP@C) composite was successfully designed and prepared to address inferior low-temperature performance of LiFePO4 cathode for lithium-ion batteries. Transmission electron microscopy (TEM) confirms the inner NVP and outer carbon layers co-existed on the surface of LFP particle. When evaluated at low-temperature operation, LFP@NVP@C composite exhibits an evidently enhanced electrochemical performance in term of higher capacity and lower polarization, compared with LFP@C. Even at − 10 °C with 0.5C, LFP@NVP@C delivers a discharge capacity of ca. 96.9 mAh·g−1 and discharge voltage of ca. 3.3 V, which is attributed to the beneficial contribution of NVP coating. NASICON-structured NVP with an open framework for readily insertion/desertion of Li+ will effectively reduce the polarization for the electrochemical reactions of the designed LFP@NVP@C composite.
中文翻译:
多核壳结构LiFePO4@Na3V2(PO4)3@C复合材料增强锂离子电池的低温性能
在这项工作中,成功设计并制备了多核壳结构的 LiFePO4@Na3V2(PO4)3@C (LFP@NVP@C) 复合材料,以解决锂离子电池 LiFePO4 正极低温性能较差的问题。透射电子显微镜 (TEM) 证实内 NVP 和外碳层共存于 LFP 颗粒表面。在低温操作下进行评估时,与 LFP@C 相比,LFP@NVP@C 复合材料在更高的容量和更低的极化方面表现出明显增强的电化学性能。即使在 − 10 °C 和 0.5C 时,LFP@NVP@C 的放电容量也约为 96.9 mAh·g-1 放电电压约 3.3 V,这归因于 NVP 涂层的有益贡献。
更新日期:2021-01-12
中文翻译:
多核壳结构LiFePO4@Na3V2(PO4)3@C复合材料增强锂离子电池的低温性能
在这项工作中,成功设计并制备了多核壳结构的 LiFePO4@Na3V2(PO4)3@C (LFP@NVP@C) 复合材料,以解决锂离子电池 LiFePO4 正极低温性能较差的问题。透射电子显微镜 (TEM) 证实内 NVP 和外碳层共存于 LFP 颗粒表面。在低温操作下进行评估时,与 LFP@C 相比,LFP@NVP@C 复合材料在更高的容量和更低的极化方面表现出明显增强的电化学性能。即使在 − 10 °C 和 0.5C 时,LFP@NVP@C 的放电容量也约为 96.9 mAh·g-1 放电电压约 3.3 V,这归因于 NVP 涂层的有益贡献。