Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 25, Pages 15089-15100Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta02565k
Keywords
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Funding
- National Natural Science Foundation of China [51604177]
- State Key Basic Research Program of PRC [2013CB934001]
- Research Grants Council of the Hong Kong Special Administrative Region, China [GRF PolyU152174/17E]
- Hong Kong Scholars Program [XJ2014045, G-YZ67]
- China Postdoctoral Science Foundation [2015M570784]
- International S&T Cooperation and Exchange Program of Sichuan Province [2017HH0068]
- Scientific Research Fund of Sichuan Provincial Department of Education [16ZB0002]
- Experimental Technology Project of Sichuan University [20170133]
- 1000 Talents Plan of Sichuan Province
- Fundamental Research Funds for the Central Universities
- Talent Introduction Program of Sichuan University [YJ201410]
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Structural deterioration and low conductivity are key factors that give rise to severe capacity fading of transition metal oxides as anodes for lithium-ion batteries (LIBs). An effective way to overcome this challenge is to construct nanosized metal oxide heterostructures integrated with a 3D nanoarchitectured metal matrix to buffer volume variation, reinforce structural stability and improve electronic conductivity. Herein, a facile and effective underpotential oxidation (UPO) assisted dealloying protocol has been developed successfully to synthesize freestanding monolithic 3D nanoporous copper@1D cuprous oxide nanowire network (3D NPC@1D Cu2O NWN) heterostructures. Based on their dealloying behavior, the evolution law can be well established, sequentially described as dealloying of (Mn, Cu) accompanying Cu2O NW germination, growth of Cu2O NWs accompanying (Mn, Cu) re-dealloying and Cu2O NWN coarsening. Compared to other CuxO-based electrode materials with different structural designs reported in the literature, the unique nanocomposites as an anode for LIBs exhibit far superior Li storage performance including an ultrahigh initial reversible capacity of 2.71 mA h cm(-2), good cycling stability with 60.2% capacity retention after 150 cycles (just 0.007 mA h per cm(2) per cycle for capacity fading), and excellent rate capability with reversible capacity as high as 1.64 mA h cm(-2) after 55 high-rate cycles. This mainly originates from effectively accommodating huge volume changes during charge/discharge processes, providing abundant reaction active sites, shortening electron/ion transport paths, and building a reliable 3D/1D composite nano-configuration without additional binders and conductive agents, indicative of a considerably promising anode candidate for high-performance LIBs.
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