Nano-Micro Letters

Waste Copper Wires to Dendritic Nanostructure for High-Energy Wire-Type Alkaline Battery

Nilesh R. Chodankar1, 2, Su-Hyeon Ji1, Young-Kyu Han2, Do-Heyoung Kim1, *

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Nano-Micro Lett. (2020) 12: 1

First Online: 12 December 2019 (Article)

DOI:10.1007/s40820-019-0337-2

*Corresponding author. E-mail: kdhh@chonnam.ac.kr (Do-Heyoung Kim)

 

Abstract

 


Toc

Rechargeable alkaline batteries (RABs) have received remarkable attention in the past decade for their high energy, low cost, safe operation, facile manufacture, and eco-friendly nature. To date, expensive electrode materials and current collectorswere predominantly applied for RABs, which have limited their real-world efficacy. In the present work, we have proposed a scalable process to utilize electronic waste (e-waste) Cu wires as a cost-effective current collector for high-energy wire-type RABs. Initially, the vertically aligned CuO nanowires are prepared over the waste Cu wires via in situ alkaline corrosion. Later, both atomic-layer-deposited NiO and NiCo-hydroxide are applied to the CuO nanowires to form a uniform dendritic-structured NiCo-hydroxide/NiO/CuO/Cu electrode. When the prepared dendritic-structured NiCo-hydroxide/NiO/CuO/Cu electrode is applied to the RAB, it shows excellent electrochemical features, namely, high energy density (82.42 Wh kg-1), excellent specific capacity (219 mAh g-1), and long-term cycling stability (94% capacity retention over 5000 cycles). The presented approach and material meet the requirements of a cost‐effective, abundant, and highly efficient electrode for advanced eco-friendly RABs. More importantly, the present method provides an efficient path to recycle e-waste for value-added energy-storage applications.


 

Keywords

Alkaline batteries; Dendritic nanostructure; NiCo-hydroxide; Electronic waste; Energy density

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