Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 26, Issue 13, Pages 2198-2206Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201504849
Keywords
anode; high-rate battery; lithium storage; MnO; pseudocapacitance
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Funding
- National Natural Science Foundation of China [21373184]
- Public Projects of Zhejiang Province [2015C31039]
- Fundamental Research Funds for the Central Universities
- Automotive CRC [1-111]
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Lithium ion batteries have attained great success in commercialization owing to their high energy density. However, the relatively delaying discharge/charge severely hinders their high power applications due to intrinsically diffusion-controlled lithium storage of the electrode. This study demonstrates an ever-increasing surface redox capacitive lithium storage originating from an unique microstructure evolution during cycling in a novel RGO-MnO-RGO sandwich nanostructure. Such surface pseudocapacitance is dynamically in equilibrium with diffusion-controlled lithium storage, thereby achieving an unprecedented rate capability (331.9 mAh g(-1) at 40 A g(-1), 379 mAh g(-1) after 4000 cycles at 15 A g(-1)) with outstanding cycle stability. The dynamic combination of surface and diffusion lithium storage of electrodes might open up possibilities for designing high-power lithium ion batteries.
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