Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 34, Pages 18830-18837Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202106857
Keywords
atomically thin; cobalt vacancies; intercalation; pseudocapacitance; sodium-ion batteries
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Funding
- Australian Research Council (ARC) [DP210103266, DE210101102]
- Griffith University
- Australian Research Council [DE210101102] Funding Source: Australian Research Council
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Engineering the electronic structure of electrode materials by introducing Co vacancies can enhance the pseudocapacitive Na+ intercalation, leading to high-capacity and high-rate energy storage. The optimized electrode exhibits excellent cycling stability and rate performance.
Electronic structure engineering on electrode materials could bring in a new mechanism to achieve high energy and high power densities in sodium ion batteries. Herein, we design and create Co vacancies at the interface of atomically thin CoSe2/graphene heterostructure and obtain Co1-xSe2/graphene heterostructure electrode materials that facilitate significant Na+ intercalation pseudocapacitance. Density functional theory (DFT) calculation suggests that the Na+ adsorption energy is dramatically increased, and the Na+ diffusion barrier is remarkably reduced due to the introduction of Co vacancy. The optimized electrode delivers a superior capacity of 673.6 mAh g(-1) at 0.1 C, excellent rate capability of 576.5 mAh g(-1) at 2.0 C and ultra-long life up to 2000 cycles. Kinetics analysis indicates that the enhanced Na+ storage is mainly attributed to the intercalation pseudocapacitance induced by Co vacancies. This work suggests that the creation of cation vacancy could bestow heterostructured electrode materials with pseudocapacitive Na+ intercalation for high-capacity and high-rate energy storage.
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