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Unlocking Fast Potassium Ion Kinetics: High‐Rate and Long‐Life Potassium Dual‐Ion Battery for Operation at −60 °C

Yang XiaState Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 ChinaFu‐Da YuEngineering Research Center of Environment-Friendly Functional Materials Ministry of Education Institute of Materials Physical Chemistry Huaqiao University Xiamen 361021 ChinaDan NieCollege of Materials Science and Engineering Shenzhen University Shenzhen 518071 ChinaYunshan JiangState Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 ChinaMei‐Yan SunState Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 ChinaLan‐Fang QueEngineering Research Center of Environment-Friendly Functional Materials Ministry of Education Institute of Materials Physical Chemistry Huaqiao University Xiamen 361021 ChinaLiang DengState Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 ChinaLei ZhaoState Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 ChinaLei ZhaoState Key Laboratory of Space Power-Sources MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 ChinaQianyu ZhangCollege of Materials Science and Engineering Sichuan University Chengdu 610064 ChinaQianyu ZhangCollege of Materials Science and Engineering Sichuan University Chengdu 610064 ChinaZhen‐Bo WangCollege of Materials Science and Engineering Shenzhen University Shenzhen 518071 China

2024en

ABI

Annotatsiya

Abstract Energy storage devices operating at low temperatures are plagued by sluggish kinetics, reduced capacity, and notorious dendritic growth. Herein, novel potassium dual‐ion batteries (PDIBs) capable of superior performance at −60 °C, and fabricated by combining MXenes and polytriphenylamine (PTPAn) as the anode and cathode, respectively, are presented. Additionally, the reason for the anomalous kinetics of K + (faster at low temperature than at room temperature) on the Ti 3 C 2 anode is investigated. Theoretical calculations, crossover experiments, and in situ XRD at room and low temperatures revealed that K + tends to bind with solvent molecules rather than anions at subzero temperatures, which not only inhibits the participation of PF 6 − in the formation of the solid electrolyte interphase (SEI), but also guarantees co‐intercalation behavior and suppresses undesirable K + storage. The advantageous properties at low temperatures endow the Ti 3 C 2 anode with fast K + kinetics to unlock the outstanding performance of PDIB at ultralow temperatures. The PDIBs exhibit superior rate capability and high capacity retention at −40 °C and −60 °C. Impressively, after charging‐discharging for 20,000 cycles at −60 °C, the PDIB retained 86.7 % of its initial capacity. This study reveals the influence of temperatures on MXenes and offers a unique design for dual‐ion batteries operating at ultralow temperatures.

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Identifikatorlar

DOI: 10.1002/anie.202406765

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