Volume 133, Issue 12 pp. 6396-6402
Zuschrift

Locally Ordered Graphitized Carbon Cathodes for High-Capacity Dual-Ion Batteries

Kai Yang

Kai Yang

Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China

Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123 China

These authors contributed equally to this work.

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Dr. Qirong Liu

Dr. Qirong Liu

Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China

These authors contributed equally to this work.

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Dr. Yongping Zheng

Dr. Yongping Zheng

Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China

These authors contributed equally to this work.

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Hang Yin

Hang Yin

Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China

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Prof. Shanqing Zhang

Corresponding Author

Prof. Shanqing Zhang

Center for Clean Environment and Energy School of Environment and Science, Griffith University, Brisbane, Queensland, 4222 Australia

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Prof. Yongbing Tang

Corresponding Author

Prof. Yongbing Tang

Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055 China

Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123 China

Key Laboratory of Advanced Materials Processing & Mold, Ministry of Education, Zhengzhou University, Zhengzhou, 450002 China

School of Chemical Sciences, Ministry of Education, University of Chinese Academy of Sciences, Beijing, 100049 China

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First published: 22 December 2020
Citations: 27

Abstract

Dual-ion batteries (DIBs) inherently suffer from limited energy density. Proposed here is a strategy to effectively tackle this issue by employing locally ordered graphitized carbon (LOGC) cathodes. Quantum mechanical modeling suggests that strong anion–anion repulsions and severe expansion at the deep-charging stage raise the anion intercalation voltage, therefore only part of the theoretical anion storage sites in graphite is accessible. The LOGC interconnected with disordered carbon is predicted to weaken the interlaminar van der Waals interactions, while disordered carbons not only interconnect the dispersed nanographite but also partially buffer severe anion–anion repulsion and offer extra capacitive anion storage sites. As a proof-of-concept, ketjen black (KB) with LOGC was used as a model cathode for a potassium-based DIB (KDIB). The KDIB delivers an unprecedentedly high specific capacity of 232 mAh g−1 at 50 mA g−1, a good rate capability of 110 mAh g−1 at 2000 mA g−1, and excellent cycling stability of 1000 cycles without obvious capacity fading.

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