title: Aqueous Rechargeable Alkaline CoxNi2-xS2/TiO2 Battery.
abstract: An electrochemical energy storage system with high energy density, stringent safety, and reliability is highly desirable for next-generation energy storage devices. Here an aqueous rechargeable alkaline CoxNi2-xS2 // TiO2 battery system is designed by integrating two reversible electrode processes associated with OH(-) insertion/extraction in the cathode part and Li ion insertion/extraction in the anode part, respectively. The prototype CoxNi2-xS2 // TiO2 battery is able to deliver high energy/power densities of 83.7 Wh/kg at 609 W/kg (based on the total mass of active materials) and good cycling stabilities (capacity retention 75.2% after 1000 charge/discharge cycles). A maximum volumetric energy density of 21 Wh/l (based on the whole packaged cell) has been achieved, which is comparable to that of a thin-film battery and better than that of typical commercial supercapacitors, benefiting from the unique battery and hierarchical electrode design. This hybrid system would enrich the existing aqueous rechargeable LIB chemistry and be a promising battery technology for large-scale energy storage.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.|Energy Research Institute@NTU (ERI@N), Nanyang Technological University , Singapore 639798, Singapore.|Heterogeneous Catalysis, Institute of Chemical Engineering and Sciences, A*Star , 1 Pesek Road, Jurong Island 627833, Singapore.
authors.forename: Jilei
authors.initials: J
authors.lastname: Liu
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.|Energy Research Institute (ERI@N), Interdisciplinary Graduate School, Nanyang Technological University , Singapore 637553, Singapore.
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Ku
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Wang
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.
authors.forename: Shi
authors.initials: S
authors.lastname: Chen
authors.affiliation: Heterogeneous Catalysis, Institute of Chemical Engineering and Sciences, A*Star , 1 Pesek Road, Jurong Island 627833, Singapore.
authors.forename: Lili
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Energy Research Institute@NTU (ERI@N), Nanyang Technological University , Singapore 639798, Singapore.
authors.forename: Jianyi
authors.initials: J
authors.lastname: Lin
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore 637371, Singapore.|Energy Research Institute (ERI@N), Interdisciplinary Graduate School, Nanyang Technological University , Singapore 637553, Singapore.
authors.forename: Ze Xiang
authors.initials: ZX
authors.lastname: Shen
keywords: CoxNi2−xS2/TiO2; alkaline; aqueous; rechargeable