多硫化物
硫黄
溶解
阴极
碳纤维
化学工程
共价键
化学
化学稳定性
储能
工作(物理)
钠
材料科学
纳米技术
电解质
复合材料
有机化学
热力学
冶金
物理化学
物理
电极
功率(物理)
复合数
工程类
作者
Yeyun Zhang,Xinyi Guo,Qi Yang,Yuan Shao,Yadong Du,Jingyao Qi,Ming Zhao,Zhi‐Liang Shang,Yuhan Hao,Yongchao Tang,Lei Ying,Riguang Zhang,Baojun Wang,Jieshan Qiu
标识
DOI:10.1073/pnas.2314408120
摘要
Sodium-sulfur (Na-S) batteries are attracting intensive attention due to the merits like high energy and low cost, while the poor stability of sulfur cathode limits the further development. Here, we report a chemical and spatial dual-confinement approach to improve the stability of Na-S batteries. It refers to covalently bond sulfur to carbon at forms of C-S/N-C=S bonds with high strength for locking sulfur. Meanwhile, sulfur is examined to be S1-S2 small species produced by thermally cutting S8 large molecules followed by sealing in the confined pores of carbon materials. Hence, the sulfur cathode achieves a good stability of maintaining a high-capacity retention of 97.64% after 1000 cycles. Experimental and theoretical results show that Na+ is hosted via a coordination structure (N···Na···S) without breaking the C-S bond, thus impeding the formation and dissolution of sodium polysulfide to ensure a good cycling stability. This work provides a promising method for addressing the S-triggered stability problem of Na-S batteries and other S-based batteries.
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