阳极
单斜晶系
锂(药物)
离子
储能
相(物质)
正交晶系
材料科学
化学
纳米技术
化学工程
结晶学
电极
功率(物理)
晶体结构
物理
工程类
有机化学
物理化学
热力学
内分泌学
医学
作者
Chao Cheng,Yunsheng Yan,Minyu Jia,Yang Liu,Linrui Hou,Changzhou Yuan
出处
期刊:Energy & environmental materials
日期:2023-02-20
卷期号:7 (2)
被引量:12
摘要
The orthorhombic CuNb 2 O 6 (O–CNO) is established as a competitive anode for lithium‐ion capacitors (LICs) owing to its attractive compositional/structural merits. However, the high‐temperature synthesis (>900 °C) and controversial charge‐storage mechanism always limit its applications. Herein, we develop a low‐temperature strategy to fabricate a nano‐blocks‐constructed hierarchical accordional O–CNO framework by employing multilayered Nb 2 CT x as the niobium source. The intrinsic stress‐induced formation/transformation mechanism of the monoclinic CuNb 2 O 6 to O–CNO is tentatively put forward. Furthermore, the integrated phase conversion and solid solution lithium‐storage mechanism is reasonably unveiled with comprehensive in(ex) situ characterizations. Thanks to its unique structural merits and lithium‐storage process, the resulted O–CNO anode is endowed with a large capacity of 150.3 mAh g −1 at 2.0 A g −1 , along with long‐duration cycling behaviors. Furthermore, the constructed O–CNO‐based LICs exhibit a high energy (138.9 Wh kg −1 ) and power (4.0 kW kg −1 ) densities with a modest cycling stability (15.8% capacity degradation after 3000 consecutive cycles). More meaningfully, the in‐depth insights into the formation and charge‐storage process here can promote the extensive development of binary metal Nb‐based oxides for advanced LICs.
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