Original scientific paper
https://doi.org/10.5599/jese.2951
CoNb2O6 embedded in graphene nanosheets as an advanced intercalation anode for high-energy lithium-ion capacitors
Yaohong Hai
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China
Xu Zhang
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China and Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology, China
*
Fuyan Ma
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China
Yuxuan Chen
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China
Lixiong He
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China
Shiyi Zhang
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China
Chunping Hou
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China and Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology, China
Zhongli Zou
; School of Materials Science and Engineering, North Minzu University, Yinchuan, 750021, China and Ningxia Research Center of Silicon Target and Silicon-Carbon Negative Materials Engineering Technology, China
Kui Cheng
; College of Engineering, Northeast Agricultural University, Harbin, 150030, China
* Corresponding author.
Abstract
Intercalation anode materials are promising candidates for hybrid lithium-ion capacitors (LICs) owing to their excellent lithium storage capacity and cycling stability. In this study, a composite of CoNb2O6 embedded in graphene nanosheets (CoNb2O6@G) was synthesized via a two-step hydrothermal method and demonstrated for the first time as an intercalation anode material for lithium storage. The graphene sheets form a three-dimensional porous framework that provides abundant binding sites for the CoNb2O6 particles, effectively mitigating particle agglomeration and volume expansion during charge-discharge cycles. The composite with the optimal graphene content of 100 mg (CoNb2O6@G-100mg) exhibited a remarkable reversible capacity of 508.5 mA h g-1 at a current density of 50 mA g-1. Furthermore, the CoNb2O6@G-100mg//activated carbon (AC) LIC, in which CoNb2O6@G-100mg and AC are used as the anode and cathode, respectively, exhibited an energy density of 94.1 W h kg-1 and a maximum power density of 8750 W kg-1 within the voltage range of 0.0 to 3.5 V. The device demonstrated outstanding cycling stability, with negligible capacity loss (0.00255% per cycle) over 10,000 charge-discharge cycles. These results demonstrate the potential of CoNb2O6@G as a high-performance anode material for energy-storage devices, particularly in power-oriented applications.
Keywords
Binary metal niobium oxides; long cycle life; high energy density; lithium storage
Hrčak ID:
344855
URI
Publication date:
10.11.2025.
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