电化学
材料科学
阴极
插层(化学)
水溶液
单排替反应
化学工程
锂(药物)
离子
电极
无机化学
物理化学
有机化学
化学
内分泌学
工程类
医学
作者
Yongjin Fang,Qi Liu,Ling Xiao,Xinping Ai,Hongtao Yang,Yuliang Cao
标识
DOI:10.1021/acsami.5b04691
摘要
Olivine NaFePO4/C microsphere cathode is prepared by a facile aqueous electrochemical displacement method from LiFePO4/C precursor. The NaFePO4/C cathode shows a high discharge capacity of 111 mAh g–1, excellent cycling stability with 90% capacity retention over 240 cycles at 0.1 C, and high rate capacity (46 mAh g–1 at 2 C). The excellent electrochemical performance demonstrates that the aqueous electrochemical displacement method is an effective and promising way to prepare NaFePO4/C material for Na-based energy storage applications. Moreover, the Na2/3FePO4 intermediate is observed for the first time during the Na intercalation process through conventional electrochemical techniques, corroborating an identical two-step phase transition reaction both upon Na intercalation and deintercalation processes. The clarification of the electrochemical reaction mechanism of olivine NaFePO4 could inspire more attention on the investigation of this material for Na ion batteries.
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