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Wrinkled Carbon-Coated NiCo₂O₄ Nanoclusters Constructed by Self-Encapsulation of Cellulose Nanonetwork for Lithium-Ion Batteries

Wang, Hanwei, Wang, Chao, Li, Caicai, Sun, Qingfeng
ACS sustainable chemistry & engineering 2019 v.7 no.12 pp. 10840-10846
active sites, anodes, carbon, cellulose, electrochemistry, electron transfer, lithium batteries, nanocrystals, nanoparticles, nanosheets
Here, we demonstrate the self-encapsulation approach by using a cellulose nanonetwork as an envelope to design and synthesize wrinkled carbon-coated NiCo₂O₄ nanoclusters as an advanced anode for lithium-ion batteries. Based on the self-encapsulation of the cellulose nanonetworks, the NiCo₂O₄ nanosheets are packaged in the wrinkled and porous carbon shell and then transform into plenty of NiCo₂O₄ nanocrystals. This smart design can provide more active sites, accelerate the electron transport and Li-ion diffusion, and buffer the volume change of active materials upon cycling. Benefiting from the features mentioned above, the wrinkled carbon-coated NiCo₂O₄ anode manifests an excellent electrochemical performance, showing a high reversible capacity of 1103 mAh g–¹ at 100 mA g–¹, extraordinary rate performance of 839 mAh g–¹ at 1 000 mA g–¹, and no-loss cycling performance after 500 cycles.