阳极
杂原子
氮气
材料科学
碳纤维
储能
阴极
化学工程
自行车
离子
化学
电极
复合材料
功率(物理)
有机化学
复合数
戒指(化学)
物理化学
物理
量子力学
考古
工程类
历史
作者
Gongrui Wang,Wentao Wang,Xiaoyue He,Jie Li,Lai Yu,Bo Peng,Rong Liu,Suyuan Zeng,Genqiang Zhang
出处
期刊:Small
[Wiley]
日期:2022-07-01
卷期号:18 (30)
被引量:11
标识
DOI:10.1002/smll.202203288
摘要
Abstract Carbon materials, as promising anode candidates for K + storage due to their low cost, abundant sources, and high physicochemical stability, however, encounter limited specific capacity and unfavorable cycling stability that seriously hinder their practical applications. Herein, a feasible strategy to tailor and stabilize the nitrogen species in unique P/N co‐doped disk‐like carbon through the Sn incorporation (P/N Sn –CD) is presented, which can largely enhance the specific capacity and cycling capability for K + storage. Specifically, it delivers a high specific capacity of 439.3 mAh g ‐1 at 0.1 A g ‐1 and ultra‐stable cycling capability with a capacity retention of 93.5% at 5000 mA g ‐1 over 5000 cycles for K + storage. The underlying mechanism for the superior K + storage performance is investigated by systematical experimental data combined with theoretical simulation results, which can be derived from the increased edge‐nitrogen species, improved content and stability of P/N heteroatoms, and enhanced ionic/electronic kinetics. After coupling P/N Sn –CD anode with activated carbon cathode, the KIHCs can deliver a high energy density of 171.7 Wh kg ‐1 at 106.8 W kg ‐1 , a superior power density (14027.0 W kg ‐1 with 31.2 Wh kg ‐1 retained), and ultra‐stable lifespan (89.7% retention after 30 K cycles with cycled at 2 A g ‐1 ).
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