电解质
材料科学
阳极
化学工程
储能
功率密度
微尺度化学
法拉第效率
钾
离子
纳米技术
电极
碳纤维
化学
复合材料
有机化学
功率(物理)
热力学
复合数
物理化学
物理
工程类
数学教育
冶金
数学
作者
Wenjie Feng,Yongpeng Cui,Wei Liu,Houlin Wang,Yuan Zhang,Yu Du,Shuang Liu,Huanlei Wang,Xiang Gao,Tianqi Wang
出处
期刊:ACS Nano
[American Chemical Society]
日期:2020-04-09
卷期号:14 (4): 4938-4949
被引量:67
标识
DOI:10.1021/acsnano.0c01073
摘要
Potassium-ion energy-storage devices are highly attractive in the large-scale energy storage field, but the intercalation of large K ions greatly worsens the stability of electrode structures and solid electrolyte interphase (SEI) films, causing slow reaction dynamics and poor durability. In this Article, inspired by bubble wraps in our life, a bubble-wrap-like carbon sheet (BPCS) with a rigid-flexible coupling porous architecture is fabricated on the microscale, exhibiting strong structural stability and good accommodation for volume expansion. In the meantime, a K2CO3·1.5H2O-dominated SEI is created by an interfacial transfer behavior of carbonate groups. These K2CO3·1.5H2O nanograins not only enhance the stability of the SEI by constructing a stable scaffold but also create more diffusion routes for K ions. On the basis of the above, using the BPCS as the anode of potassium-ion batteries delivers reversible capacities of 463 mAh g–1 at 50 mA g–1 and 195 mAh g–1 at 10 A g–1 with a long cycling life. The assembled BPCS//NPC potassium-ion hybrid capacitor exhibits a high energy density of 167 Wh kg–1 and a superior cycling capability with 80.8% capacity retention over 10 000 cycles with nearly 100% Coulombic efficiency. Even at the higher current density of 10 A g–1, the device could deliver an energy density of 92.9 Wh kg–1 over 5000 cycles at a power density of 9200 W kg–1 with only 0.002% fading per cycle, which can rival lithium-ion hybrid supercapacitors.
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