Citation: Weijie Cheng, Qi Feng, Zhanglin Guo, Guanjun Chen, Yong Wang, Lixiong Yin, Jiayin Li, Xingang Kong. Electrochemical reaction mechanism of porous Zn₂Ti₃O₈ as a high-performance pseudocapacitive anode for Li-ion batteries[J]. Chinese Chemical Letters, ;2022, 33(11): 4776-4780. doi: 10.1016/j.cclet.2022.01.002 shu

Electrochemical reaction mechanism of porous Zn₂Ti₃O₈ as a high-performance pseudocapacitive anode for Li-ion batteries

Weijie Cheng ^a ,
Qi Feng ^{a, c, *,} ,
Zhanglin Guo ^b ,
Guanjun Chen ^a ,
Yong Wang ^a ,
Lixiong Yin ^a ,
Jiayin Li ^a ,
Xingang Kong ^{a, *,}

a.
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
b.
Graduate School of Engineering, Toin University of Yokohama, Kanagawa 225-8503, Japan
c.
Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu-shi 761-0396, Japan

feng@eng.kagawa-u.ac.jp

yezhu_1983@163.com

Received Date: 29 September 2021
Revised Date: 9 December 2021
Accepted Date: 4 January 2022
Available Online: 8 January 2022

Figures(4)

Zn₂Ti₃O₈, as a new type of anode material for lithium-ion batteries, is attracting enormous attention because of its low cost and excellent safety. Though decent capacities have been reported, the electrochemical reaction mechanism of Zn₂Ti₃O₈ has rarely been studied. In this work, a porous Zn₂Ti₃O₈ anode with considerably high capacity (421 mAh/g at 100 mA/g and 209 mAh/g at 5000 mA/g after 1500 cycles) was reported, which is even higher than ever reported titanium-based anodes materials including Li₄Ti₅O₁₂, TiO₂ and Li₂ZnTi₃O₈. Here, for the first time, the accurate theoretical capacity of Zn₂Ti₃O₈ was confirmed to be 266.4 mAh/g. It was also found that both intercalation reaction and pseudocapacitance contribute to the actual capacity of Zn₂Ti₃O₈, making it possibly higher than the theoretical value. Most importantly, the porous structure of Zn₂Ti₃O₈ not only promotes the intercalation reaction, but also induces high pseudocapacitance capacity (225.4 mAh/g), which boosts the reversible capacity. Therefore, it is the outstanding pseudocapacitance capacity of porous Zn₂Ti₃O₈ that accounts for high actual capacity exceeding the theoretical one. This work elucidates the superiorities of porous structure and provides an example in designing high-performance electrodes for lithium-ion batteries.
- Zn₂Ti₃O₈,
- Lithium-ion battery,
- Electrochemical reaction mechanism,
- Theoretical capacity,
- Pseudocapacitance
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Electrochemical reaction mechanism of porous Zn2Ti3O8 as a high-performance pseudocapacitive anode for Li-ion batteries

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Electrochemical reaction mechanism of porous Zn₂Ti₃O₈ as a high-performance pseudocapacitive anode for Li-ion batteries