Volume 21, Issue 9 2410350
Research Article

Unveiling Aqueous Potassium-Ion Batteries with Prussian Blue Analogue Cathodes

Xu Tan

Xu Tan

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Chenyang Gao

Chenyang Gao

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Zhifen Luo

Zhifen Luo

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Weijia Fan

Weijia Fan

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Xiaosong Xiong

Xiaosong Xiong

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Zezhong Shi

Zezhong Shi

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Ningxun Zhang

Ningxun Zhang

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Zheng Yang

Zheng Yang

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Yuan Ma

Yuan Ma

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Xin-Bing Cheng

Xin-Bing Cheng

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Yiren Zhong

Yiren Zhong

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Jiarui He

Jiarui He

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Zhi Zhu

Zhi Zhu

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Faxing Wang

Faxing Wang

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

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Tao Wang

Corresponding Author

Tao Wang

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

E-mail: [email protected]; [email protected]

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Bingan Lu

Bingan Lu

School of Physics and Electronics, Hunan University, Changsha, 410082 P. R. China

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Yuping Wu

Corresponding Author

Yuping Wu

Confucius Energy Storage Lab, Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Z Energy Storage Center & School of Energy and Environment, Southeast University, Nanjing, 211189 P. R. China

E-mail: [email protected]; [email protected]

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First published: 19 January 2025
Citations: 4

Abstract

Aqueous rechargeable potassium-ion batteries have considerable advantages and potentials in the application of large-scale energy storage systems, owing to its high safety, abundant potassium resources, and environmental friendliness. However, the practical applications are fraught with numerous challenges. Identification of suitable cathode materials and potassium storage mechanisms are of great significance. Herein, an aqueous potassium-ion battery comprising Prussian blue analogs cathode (K1.15Fe[Fe(CN)6]·1.36H2O) and perylene-3,4,9,10-tetracarboxylic anode is designed, which delivers a high energy density of 52.0 Wh kg−1 and excellent cycling stability with high capacity retention of 84.5% after 4000 cycles. Importantly, a synergistic study of the relationships among crystal structure, spin state, kinetics, and electrochemical performances is thoroughly conducted. By employing in situ and ex situ characterizations, the potassium storage mechanism is comprehensively elucidated from multiple perspectives.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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