材料科学
阴极
硫黄
电化学
多硫化物
纳米技术
化学工程
纳米颗粒
储能
电解质
碳纤维
电极
复合材料
化学
冶金
物理化学
复合数
物理
工程类
功率(物理)
量子力学
作者
Zhuosen Wang,Jiadong Shen,Jun Liu,Xijun Xu,Zhengbo Liu,Renzong Hu,Lichun Yang,Yuezhan Feng,Jun Liu,Zhicong Shi,Liuzhang Ouyang,Yan Yu,Min Zhu
标识
DOI:10.1002/adma.201902228
摘要
Abstract Lithium–sulfur (Li–S) batteries have attracted much attention in the field of electrochemical energy storage due to their high energy density and low cost. However, the “shuttle effect” of the sulfur cathode, resulting in poor cyclic performance, is a big barrier for the development of Li–S batteries. Herein, a novel sulfur cathode integrating sulfur, flexible carbon cloth, and metal–organic framework (MOF)‐derived N‐doped carbon nanoarrays with embedded CoP (CC@CoP/C) is designed. These unique flexible nanoarrays with embedded polar CoP nanoparticles not only offer enough voids for volume expansion to maintain the structural stability during the electrochemical process, but also promote the physical encapsulation and chemical entrapment of all sulfur species. Such designed CC@CoP/C cathodes with synergistic confinement (physical adsorption and chemical interactions) for soluble intermediate lithium polysulfides possess high sulfur loadings (as high as 4.17 mg cm –2 ) and exhibit large specific capacities at different C‐rates. Specially, an outstanding long‐term cycling performance can be reached. For example, an ultralow decay of 0.016% per cycle during the whole 600 cycles at a high current density of 2C is displayed. The current work provides a promising design strategy for high‐energy‐density Li–S batteries.
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