Lei Zheng, Ao Tang, Xiaofei Gong, Chaoqun Shang, Pu Hu
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引用次数: 0
摘要
Na4MnV(PO4)3 (NMVP)阴极材料因其独特的结构和较高的理论容量而作为电网应用的潜在候选材料备受关注。然而，它们的电子导电性不足，影响了循环稳定性和速率能力，给实际应用带来了挑战。为了解决这个问题，我们采用了掺杂 Zr4+ 和双碳涂层的策略来提高 NMVP 的电化学性能。通过全面的动力学评估，Na3.8MnV0.8Zr0.2(PO4)3/C/rGO 复合材料显著提高了速率能力（60 °C 时为 71.9 mAh g-1）和持续的循环稳定性（1000 次循环后在 2 C 下的保持率为 84.8%）。性能的提高可归因于大尺寸离子掺杂促进了纳离子通路的扩展，以及双层涂层提高了电子导电性。
Na3.8MnV0.8Zr0.2(PO4)3/C/rGO composite cathode for sodium-ion battery with enhanced cycling stability and rate capability
Na4MnV(PO4)3 (NMVP) cathode materials have attracted significant attention as potential candidates for grid applications due to their distinctive structure and high theoretical capacity. However, their inadequate electronic conductivity compromises both cycling stability and rate capability, presenting a challenge for practical implementation. To address this issue, we employed a strategy involving Zr4+ doping and dual-carbon coating to enhance the electrochemical performance of NMVP. The resulting Na3.8MnV0.8Zr0.2(PO4)3/C/rGO composite demonstrated markedly improved rate capability (71.9 mAh g−1 at 60 °C) and sustained cyclic stability (84.8% retention at 2 C after 1000 cycles), as validated through comprehensive kinetics assessments. The enhanced performance can be attributed to the expanded Na-ion pathways facilitated by large size ion doping and the improved electronic conductivity enabled by the dual-layer coating.
期刊介绍：
Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.
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