钒
X射线光电子能谱
锂(药物)
氧化还原
纳米片
化学
反应机理
电化学
材料科学
分析化学(期刊)
化学工程
离子
无机化学
阳极
电极
纳米技术
物理化学
催化作用
工程类
内分泌学
有机化学
医学
生物化学
色谱法
作者
Yameng Yin,Cunyuan Pei,Xiaobin Liao,Fangyu Xiong,Wei Yang,Biaobiao Xiao,Yan Zhao,Zijie Ren,Longhua Xu,Qinyou An
出处
期刊:Chemsuschem
[Wiley]
日期:2021-06-16
卷期号:14 (14): 2984-2991
被引量:10
标识
DOI:10.1002/cssc.202100880
摘要
Abstract Na 3 V 2 O 2 (PO 4 ) 2 F (NVOPF) as an attractive electrode material has received much attention based on the one‐electron reaction of V 4+ /V 5+ . However, the electrochemical reactions involving lower vanadium valences were not investigated till now. Herein, a composite of graphene decorated nanosheet‐assembled NVOPF microflowers (NVOPF/G) was synthesized and the multi‐electron reaction of NVOPF/G was conducted by controlling the operation voltage windows. The reaction mechanism, structural changes, and vanadium valences during the insertion/extraction of Li ions (from 2 to 6) were elucidated clearly by in‐situ X‐ray diffraction and ex‐situ X‐ray photoelectron spectroscopy. Theoretical computations also revealed the Li‐ion locations in the structure of NaV 2 O 2 (PO 4 ) 2 F. Due to the additional redox couple of V 3+ /V 4+ , NVOPF/G displayed a much higher initial capacity of 183.3 mAh g −1 in the wider voltage window of 1.0–4.8 V than that of 2.5–4.8 V (129.3 mAh g −1 ). Moreover, excellent Li‐storage performance of NVOPF/G at a lower voltage (≤2.5 V) with the active reaction of V 2+ /V 3+ /V 4+ was obtained for the first time, demonstrating the high potential of NVOPF/G as an anode material for Li ion storage.
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