Journal
ACS NANO
Volume 13, Issue 5, Pages 6113-6124Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.9b02928
Keywords
cobalt diselenide; carbon matrix; phase transition; anode; lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51672049, 51871060, 51831009]
- China Postdoctoral Science Foundation [2018M640337]
- CURE (Hui-Chun Chin and Tsung-Dao Lee Chinese Undergraduate Research Endowment) [18928]
- National University Student Innovation Program [201810246085]
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Transition metal chalcogenides (TMCs) have been investigated as promising anodes for high-performance lithium-ion batteries, but they usually suffer from poor conductivity and large volume variation, thus leading to unsatisfactory performance. Although nanostructure engineering and hybridization with conductive materials have been proposed to address this concern, a better performance toward practical device applications is still highly desired. Herein, we report an iron-doping-induced structural phase transition from pyrite-type (cubic) to marcasite-type (orthorhombic) phases in porous carbon/rGO-coupled CoSe2. The dual-carbon-confined orthorhombic CoSe2 (o-FexCo1-xSe2@NC@rGO) composites exhibit dramatically enhanced lithium storage performance (920 mAh g(-1) after 1000 cycles at 1.0 A g(-1)) over cubic CoSe2-based composites (c-CoSe2@NC@rGO). The combined experimental studies and density functional theory calculations reveal that this doping-induced structural phase transformation strategy could create a favorable electronic structure and ensure a rapid charge transfer. These results demonstrate that the phase transformation engineering may provide another opportunity in the design of high-performance TMC-based electrodes.
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