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- 저자 : Ranganathan Gaddam, R. (검색결과 1 건)
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Pre-sodiated nickel cobaltite for high-performance sodium-ion capacitors
Yang, D.,Sun, X.,Lim, K.,Ranganathan Gaddam, R.,Ashok Kumar, N.,Kang, K.,Zhao, X.S. Elsevier Sequoia 2017 Journal of Power Sources Vol.362 No.-
Sodium-ion capacitors (NICs) are a hybrid energy storage system that store energy via both charge adsorption at the cathode/electrolyte interface and charge intercalation in the bulk of the anode, thereby possessing a higher energy density than supercapacitors and a higher power density than batteries. In this work, nickel cobaltite (NiCo<SUB>2</SUB>O<SUB>4</SUB>) hollow spheres with a chestnut shell morphology have been solvothermally synthesized and tested in a sodium half-cell. The NiCo<SUB>2</SUB>O<SUB>4</SUB> material exhibits a reversible capacity of 313 mAh g<SUP>-1</SUP> at 1 A g<SUP>-1</SUP>. Pre-sodiation of NiCo<SUB>2</SUB>O<SUB>4</SUB> is found to significantly improve its energy density. A NIC fabricated with pre-sodiated NiCo<SUB>2</SUB>O<SUB>4</SUB> as the anode and an activated carbon (AC) as the cathode delivers an energy density of 60 Wh kg<SUP>-1</SUP> at the power density of 10,000 W kg<SUP>-1</SUP>. Ex-situ X-ray diffraction (XRD) and transmission electron microscopy (TEM) results reveal that NiCo<SUB>2</SUB>O<SUB>4</SUB> is converted to metallic nickel and cobalt and Na<SUB>2</SUB>O phases during the pre-sodiation. The metallic nickel and cobalt phases are kinetically favourable for the electrolyte diffusion and electrochemical reactions, thus significantly improving the performance of the pre-sodiated NiCo<SUB>2</SUB>O<SUB>4</SUB> electrode.
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