材料科学
微观结构
阴极
电池(电)
对偶(语法数字)
离子
电容器
碳纤维
纳米技术
光电子学
复合材料
复合数
电气工程
电压
功率(物理)
艺术
物理
文学类
量子力学
工程类
作者
Qianqian Yao,Pei Song Tang,Shiyin Xie,Y. Chen,Qingyun Dou,Jianxi Zhu,Xingbin Yan
标识
DOI:10.1002/adfm.202314962
摘要
Abstract Hybrid potassium‐ion capacitors (PICs) and potassium dual‐ion batteries (PDIBs) represent two types of potassium‐based electrochemical energy storage devices. Their differences in the microstructure of carbon cathodes enable PICs and PDIBs to possess high power and energy density, respectively. Herein, a hybrid device integrating PIC and PDIB, called as dual‐ion capacitor‐battery hybrid device (DICB), is designed by modifying the microstructure of carbon cathode, to simultaneously acquire high power and energy density. By utilizing the carbon cathode combining highly‐disordered and pseudo‐graphitic microstructures, the resultant DICB demonstrates excellent energy density (320.4 Wh kg −1 ) and power density (15.9 kW kg −1 ) with 1.5‐4.5 V. By utilizing the carbon cathode having both pseudo‐graphitic and highly‐graphitic microstructures, the corresponding DICB can achieve an elevated energy density (351.7 Wh kg −1 ) within a wider voltage range 1.5‐5.0 V. Experiments reveal that in the mixed microstructures of carbon cathodes, highly‐disordered part mainly exhibits capacitive contribution, the pseudo‐graphitic part provides both capacitor‐ and battery‐type energy storage behaviors, and the highly‐graphitic part offers additional capacity through ion insertion/extraction in the higher voltage region. Consequently, the carbon cathode with mixed microstructure can introduce both capacitor‐ and battery‐type energy storage behaviors in a device, thereby regulating the energy and power output characteristics of the DICB.
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