氧化还原
材料科学
锐钛矿
锂(药物)
X射线光电子能谱
电解质
阳极
拉曼光谱
无机化学
法拉第效率
磷酸钒锂电池
化学工程
电极
催化作用
化学
物理化学
有机化学
光催化
光学
物理
工程类
内分泌学
医学
冶金
作者
Feng Pan,Jing Yang,Qizhao Huang,Xingzhu Wang,Hui Huang,Qing Wang
标识
DOI:10.1002/aenm.201400567
摘要
Anatase TiO 2 is an extensively studied anode material for lithium‐ion batteries because of its superior capability of storing Li + electrochemically. Here reversible lithium storage of TiO 2 is achieved chemically using redox targeting reactions. In the presence of a pair of redox mediators, bis(pentamethylcyclopentadienyl)cobalt (CoCp * 2 ) and cobaltocene (CoCp 2 ) in an electrolyte, TiO 2 and its lithiated form Li x TiO 2 can be reduced and oxidized by CoCp * 2 and CoCp 2 + , respectively, which accompany Li + insertion and extraction, albeit without attaching the TiO 2 onto the electrode. The reversible chemical lithiation/delithiation and the involved phase transitions are unambiguously confirmed using density functional theory (DFT) calculations, UV‐vis spectroscopy, X‐ray photoelectron spectoscopy (XPS), and Raman spectroscopy. A redox flow lithium‐ion battery (RFLB) half‐cell is assembled and evaluated, which is a critical step towards the development of RFLB full cells.
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