Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 16, Pages 14854-14861Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b04006
Keywords
Ni-Zn battery; Ni nanoparticles; N-doped carbon; composite; stable
Funding
- National Natural Science Foundation of China [21822509, U1810110, 11602088, 31530009]
- Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program [2015TQ01C205]
- Pearl River Nova Program of Guangzhou [201610010080]
- Technology Planning Project of Guangdong Province [2016A010103039]
- Technology Planning Project of Guangdong Province (110th file of 2015)
- opening project of the State Key Laboratory for Strength and Vibration of Mechanical Structures (Xi'an Jiaotong University) [SV2018-KF-33]
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Aqueous rechargeable nickel-zinc batteries are highly attractive for large-scale energy storage for their high output voltage, low cost, and excellent safety; however, their inferior cycling durability due to the degradation of the Ni-based cathode is a major obstacle for their applications. In this context, we develop a new kind of porous electrochemically activated Ni nanoparticle/nitrogen-doped carbon (Ni/NC) composite material as ultrastable cathodes for advanced aqueous rechargeable nickel-zinc batteries. The in situ formation of a highly active NiOx(OH)(y) layer on Ni nanoparticles and a unique hydrophilic porous architecture endow the activated Ni/NC composite with high accessible area, abundant active sites, easy electrolyte permeation, and shortened charge/ion transport pathway. Consequently, a high capacity of 381.2 mu Ah cm(-3) with an outstanding rate capability is achieved by the Ni-Zn battery using the optimized activated Ni/NC composite as the cathode (about 30-fold enhancement compared to that with the pristine Ni/NC composite as the cathode). More impressively, the as-assembled Ni-Zn battery achieves an unprecedented cyclic stability with no capacity loss after 36 000 charge/discharge cycles. This is the highest cyclic durability ever for Ni-Zn batteries and other aqueous rechargeable batteries. This novel efficient electrochemical activation strategy to achieve a high-performance cathode and demonstration of an ultrastable aqueous rechargeable Ni-Zn battery may open up new vistas on the development of more advanced and reliable energy storage materials and devices.
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