材料科学
插层(化学)
阴极
阳极
氧化还原
电化学
电池(电)
介电谱
电极
钠离子电池
离子
储能
分析化学(期刊)
无机化学
物理化学
化学
法拉第效率
有机化学
功率(物理)
物理
量子力学
冶金
作者
Ping Hu,Ting Zhu,Congcong Cai,B. Mai,Chen Yang,Jianmin Ma,Liang Zhou,Hong Jin Fan,Liqiang Mai
标识
DOI:10.1002/adfm.202208051
摘要
Abstract To enhance the energy density of batteries and explore intrinsic charge storage mechanism of the active materials, it is important to reduce or eliminate the use of non‐active materials in electrodes, such as binder and conductive additives. Herein, free‐standing Na 4 MnV(PO 4 ) 3 @C (F‐NMVP@C) fiber membrane is fabricated and directly used as a sodium‐ion battery (SIB) cathode. In situ X‐ray diffraction reveals that the V 3+ /V 4+ redox reaction occurs through a solid‐solution reaction while a two‐phase Mn 2+ /Mn 3+ redox reaction is identified, and both are highly reversible. Meanwhile, ex situ electrochemical impedance spectroscopy reveals that both the ion diffusion coefficient and charge transfer resistance of F‐NMVP@C change reversibly during the Na + intercalation/de‐intercalation. Battery full cells are assembled based on the free‐standing F‐NMVP@C cathodes and F‐Sb@C anodes, which manifests a high energy density (293 Wh kg −1 ) and good cyclability (87.5% after 100 cycles at 1 C). The high‐performance free‐standing cathodes and anodes shed light on the development of flexible SIBs.
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