王接喜

冷进论文"A Novel Dried Plum-Like Yolk-Shell Architecture of Tin Oxide Nanodots Embedded into Carbon Matrix: Ultra-Fast Assembly and Superior Lithium Storage Property"被J Mater Chem A接收发表

发布时间：2020-04-25

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Tin oxides as one of the potential candidates for commercial graphite anode suffer from serious challenges of poor electrical conductivity and large volume variation during cycling. Dispersing nanostructured SnO_x into carbon matrix may be an effective strategy to solve these problems. In this work, a novel dried plum-like yolk-shell SnO_x/C architecture with high specific surface area and superior structural stability is constructed by an extremely facile and scalable spray pyrolysis method in ten seconds. The SnO_x nanodots (<10 nm) are uniformly embedded into the in-situ generated carbon matrix. Polyvinylpyrrolidone is introduced here as multifunctional agent to generate dried plum-like yolk-shell morphology as well as to form the carbon matrix. The formation mechanism of such unique morphology is discussed and revealed with in-depth comparison. As anode for lithium ion batteries, the characteristic SnO_x/C yolk-shell microspheres exhibit high reversible capacity of 1142 mAh g^-1 at 0.2 A g^-1, good rate capability of 509 mAh g^-1 at 5 A g^-1, and excellent cycling performance of ~100% capacity retention in 600 cycles. This work provides an ultra-simple route for large scale production of yolk-shell nanomaterials for energy-related as well as other applications.

https://pubs.rsc.org/en/content/articlehtml/2019/ta/c8ta12399c