A Zn–NiO rechargeable battery with long lifespan and high energy density

Abstract

A Zn-NiO rechargeable battery comprising a NiO nanosheet anchored to CNTs as the positive electrode, a zinc plate as the negative one and an alkaline solution of 1 M KOH and 10 mM Zn(Ac) 2 as the electrolyte is reported. It delivers a voltage of $1.75 V and a high energy density of 228 W h kg À1 (based on the mass of the positive electrode composite and zinc) with good cycling. It has great promise for practical energy storage applications. † Electronic supplementary information (ESI) available: The preparation of NiO-CNTs and NiO, CV curves of NiO-CNTs and NiO, X-ray diffraction patterns of NiO-CNTs during charge-discharge process, Nyquist plots of NiO-CNTs and NiO, cycling behaviour of NiO-CNTs and NiO, and TEM micrograph of NiO-CNTs aer 4000 full cycles. See

Critical Role of pH Evolution of Electrolyte in the Reaction Mechanism for Rechargeable Zinc Batteries

“…For zinc metal, an additional advantage exists in that an aqueous electrolyte can be employedt oa chieveahighly reversible electrodeposition/stripping reactiono nt he negative electrode without dendrite formation. [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] The detailed reactionm echanism of these manganese dioxide structures with zinc ions in aqueous solution is still cryptic but wasc onventionally explained by the intercalation of zinc ions into the tunnelstructures. This is certainly advantageous compared to conventional cells employing Zn metal and alkaline electrolytes, which suffer from poor coulombic efficiency and dangerousd endrite formation,a lthough many advances have been made recently.…”

Co(OH)2 Nanosheets Coupled With CNT Arrays Grown on Ni Mesh for High-Rate Asymmetric Supercapacitors with Excellent Capacitive Behavior

“…Intensive researches have been carried out on cobalt/nickel-based materials, including Co(OH) 2 /graphene [19,20], Co 3 O 4 @MWCNT [21], NiO-Zn [22] …”

Metal Phosphides and Phosphates‐based Electrodes for Electrochemical Supercapacitors

“…Both Ni 2 P and Ni 5 P 4 nanoparticles were investigated as supercapacitor electrode materials, where Ni 2 P was shown with better electrochemical performance, including a higher specific capacitance, better rate capability and stability . For the nickel phosphides prepared in powder forms, binders and carbon black were required to enhance the physical contact of active materials and as the current collector . There have also been considerable efforts in developing binder‐free electrodes with these metal phosphides .…”

“…A foamy and porous product was finally obtained, owing to the gradual release of gases accompanied with the decomposition process. Similarly, Na 4 Ni 3 (PO 4 ) 2 P 2 O 7 was also developed by SCS method . In some of these previously reported works, samples were prepared by using different fuels, such as glycine and hexamine.…”