Electroactive ZnO: Mechanisms, Conductivity, and Advances in Zn Alkaline Battery Cycling
Journal Article
·
· Advanced Energy Materials
- The City College of New York, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Zinc oxide is of great interest for advanced energy devices because of its low cost, wide direct bandgap, non-toxicity, and facile electrochemistry. In zinc alkaline batteries, ZnO plays a critical role in electrode passivation, a process that hinders commercialization and remains poorly understood. Here, novel observations of an electroactive type of ZnO formed in Zn-metal alkaline electrodes are disclosed. The electrical conductivity of battery-formed ZnO is measured and found to vary by factors of up to 104, which provides a first-principles-based understanding of Zn passivation in industrial alkaline batteries. Simultaneous with this conductivity change, protons are inserted into the crystal structure and electrons are inserted into the conduction band in quantities up to ≈1020 cm–3 and ≈1 mAh gZnO–1. Electron insertion causes blue electrochromic coloration with efficiencies and rates competitive with leading electrochromic materials. The electroactivity of ZnO is evidently enabled by rapid crystal growth, which forms defects that complex with inserted cations, charge-balanced by the increase of conduction band electrons. Furthermore, this property distinguishes electroactive ZnO from inactive classical ZnO. Knowledge of this phenomenon is applied to improve cycling performance of industrial-design electrodes at 50% zinc utilization and the authors propose other uses for ZnO such as electrochromic devices.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Electricity (OE); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- NA0003525; SC0012704
- OSTI ID:
- 1855819
- Alternate ID(s):
- OSTI ID: 1846221
OSTI ID: 1890430
- Report Number(s):
- BNL-223523-2022-JAAM; SAND2022-3146J; 704218
- Journal Information:
- Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 15 Vol. 12; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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