New Nanoconfined Galvanic Replacement Synthesis of Hollow Sb@C Yolk–Shell Spheres Constituting a Stable Anode for High-Rate Li/Na-Ion Batteries

作者：Jun Liu, Litao Yu, Chao Wu, Yuren Wen, Kuibo Yin, Fu‐Kuo Chiang, Renzong Hu, Jiangwen Liu, Litao Sun, Lin Gu, Joachim Maier, Yan Yu, Min Zhu · 发表于：Nano Letters · 年份：2017 · DOI：10.1021/acs.nanolett.7b00083 · 被引用次数：413 · 研究领域：Advancements in Battery Materials、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

In the current research project, we have prepared a novel Sb@C nanosphere anode with biomimetic yolk–shell structure for Li/Na-ion batteries via a nanoconfined galvanic replacement route. The yolk–shell microstructure consists of Sb hollow yolk completely protected by a well-conductive carbon thin shell. The substantial void space in the these hollow Sb@C yolk–shell particles allows for the full volume expansion of inner Sb while maintaining the framework of the Sb@C anode and developing a stable SEI film on the outside carbon shell. As for Li-ion battery anode, they displayed a large specific capacity (634 mAh g –1 ), high rate capability (specific capabilities of 622, 557, 496, 439, and 384 mAh g –1 at 100, 200, 500, 1000, and 2000 mA g –1, respectively) and stable cycling performance (a specific capacity of 405 mAh g –1 after long 300 cycles at 1000 mA g –1 ). As for Na-ion storage, these yolk–shell Sb@C particles also maintained a reversible capacity of approximate 280 mAh g –1 at 1000 mA g –1 after 200 cycles.