Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 20, Pages 9723-9736Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta02863j
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Funding
- Qilu Young Scholar Program in Shandong University
- Natural Science Foundation of Shandong Province [ZR2017BEM018]
- Open Program in Tsinghua University State Key Laboratory of New Ceramic and Fine Processing [KF201717]
- Guangxi Natural Science Foundation of China [2015GXNSFFA139002]
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A MnO@C microcage with a multi-structure and tunable carbon shell was fabricated through a facile bio-inspired synthesis strategy for highly reversible Li storage. Micrometer-sized MnO unit aggregates were covered with a porous carbon shell outside with a thickness of about 0.2 m, and a graphene-analogous carbon network inside the MnO@C microcages. The carbon shell could be tunable by a graphene-base shell. The unique double-carbon-coating structure of the MnO@C microcages enabled realizing the high Li-storage performance of the MnO particles with a micrometer size. The electrode containing the MnO@C microcages delivered a high reversible capacity of 1450.5 mA h g(-1) after 270 cycles at a current density of 0.1 A g(-1), good rate capability, and outstanding cycling stability with a retention capacity of 805 mA h g(-1) after 2000 cycles at a high current density of 1 A g(-1). Quantitative kinetic analysis indicated that around 40% of the charge storage came from the capacitive contribution of the microcage structure. It was found that the tunable graphene-base shell could enhance the Li-ion diffusion rate significantly, and enable a stable ultralong long life cycle performance and enhanced rate performance of the microcages.
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