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Na4MnCr(PO4)3 with a Dual Conductive Network for Sodium-Ion Batteries
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2023-07-28 , DOI: 10.1002/adsu.202300233 Sijie Yu 1 , Yuwei Chen 1 , Yangyang Huang 1 , Huabin Sun 2 , Yu Xie 1 , Sihao Du 1 , Wei Luo 1
Advanced Sustainable Systems ( IF 6.5 ) Pub Date : 2023-07-28 , DOI: 10.1002/adsu.202300233 Sijie Yu 1 , Yuwei Chen 1 , Yangyang Huang 1 , Huabin Sun 2 , Yu Xie 1 , Sihao Du 1 , Wei Luo 1
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NASICON (NAtrium Super Ionic CONductor)-structured Na4MnCr(PO4)3 has attracted attention as a promising cathode for sodium-ion batteries due to its high operating voltage and specific capacity contributed by multielectron reactions. Unfortunately, its intrinsic low electronic conductivity significantly hinders the release of specific capacity and rate capability, preventing its practical application. Herein, a carbon layer with dual conductive networks connected by chain-like Ketjen black (KB) is built on the surface of Na4MnCr(PO4)3 material. This novel Na4MnCr(PO4)3/C@KB composite material exhibits improved rate capability of 61.2 mAh g−1 at 2 C compared to 19.5 mAh g−1 of Na4MnCr(PO4)3/C and high reversible capacity of 88.0 mAh g−1 at 1 C with 73% capacity retention after 100 cycles. The enhanced electrochemical performance can be ascribed to an increase of electronic conductivity enabled by the dual conductive 3D network construction and an adequate infiltration of electrolyte by substantial pores existence in carbon layer. A promising dual conductive network design strategy is demonstrated here for improving the performance of NASICON-structured cathodes.
中文翻译：
用于钠离子电池的具有双导电网络的 Na4MnCr(PO4)3
NASICON（NAtrium超离子导体）结构的Na 4 MnCr(PO 4 ) 3由于其高工作电压和由多电子反应贡献的比容量，作为钠离子电池的有前景的正极而引起了人们的关注。不幸的是，其固有的低电子电导率极大地阻碍了比容量和倍率能力的释放，阻碍了其实际应用。在此，在Na 4 MnCr(PO 4 ) 3材料的表面上构建了具有由链状科琴黑(KB)连接的双导电网络的碳层。这种新型Na 4 MnCr(PO 4 ) 3与Na 4 MnCr(PO 4 ) 3 /C的19.5 mAh g -1相比，/C@KB复合材料在2 C下表现出61.2 mAh g -1的改进倍率性能和在1 C下88.0 mAh g -1的高可逆容量100次循环后容量保持率为73%。电化学性能的增强可归因于双导电3D网络结构所实现的电子电导率的增加以及碳层中存在的大量孔使电解质充分渗透。这里展示了一种有前途的双导电网络设计策略，用于提高 NASICON 结构阴极的性能。
更新日期：2023-07-30
中文翻译：
用于钠离子电池的具有双导电网络的 Na4MnCr(PO4)3
NASICON（NAtrium超离子导体）结构的Na 4 MnCr(PO 4 ) 3由于其高工作电压和由多电子反应贡献的比容量，作为钠离子电池的有前景的正极而引起了人们的关注。不幸的是，其固有的低电子电导率极大地阻碍了比容量和倍率能力的释放，阻碍了其实际应用。在此，在Na 4 MnCr(PO 4 ) 3材料的表面上构建了具有由链状科琴黑(KB)连接的双导电网络的碳层。这种新型Na 4 MnCr(PO 4 ) 3与Na 4 MnCr(PO 4 ) 3 /C的19.5 mAh g -1相比，/C@KB复合材料在2 C下表现出61.2 mAh g -1的改进倍率性能和在1 C下88.0 mAh g -1的高可逆容量100次循环后容量保持率为73%。电化学性能的增强可归因于双导电3D网络结构所实现的电子电导率的增加以及碳层中存在的大量孔使电解质充分渗透。这里展示了一种有前途的双导电网络设计策略，用于提高 NASICON 结构阴极的性能。
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