Work

Scalable and Effectual Preparation of MnO2 from Spent Alkaline Batteries for Zn-Ion Batteries

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Recycling Mn compounds from spent alkaline batteries (SABs) not only follows the ongoing trend of circular economy but also conserves nature without disposal of hazardous battery wastes. Both pyrometallurgical and hydrometallurgical techniques were included to aim for a low-cost, environmental-contaminant-minimized, and mass-production process. The SAB-electrode powder mainly consisted of Mn(III) compounds by X-ray diffraction (XRD), together with ca. 6 wt % carbon by X-ray fluorescence (XRF). Heat treatment under N 2 gas was executed on the powder at a temperature from 650 to 950 °C for 2 h. At 950 °C, XRD revealed only crystalline MnO, yet other components were amorphous/nanocrystalline C- and Zn-based substances from XRF. Leaching the heated SAB powder was tried with stoichiometric volume +20 vol % excess of 2 M H 2 SO 4 to receive MnSO 4 solution─the best leaching efficiency of 98%. The leachate was well-mixed with the stoichiometric KMnO 4 mass at 30, 60, or 90 °C for 1 h, giving the 99% yield SAB-MnO 2 . SAB-MnO 2 was electrochemically tested (rate and long-cycling tests) as a Zn-ion battery (ZIB). Both tests show promising results: especially for the long cycling at 5 mA/g, good capacity retention of the ZIB using SAB-MnO 2 was recognized when the ZIB with commercial MnO 2 was a reference.

Source: ACS Omega

DOI: 10.1021/acsomega.4c10293

Authors: Kanyanut Konkate, Nattaporn Tonanon, Rojana Pornprasertsuk, Nisit Tantavichet, Jitti Kasemchainan

Institutions: Chulalongkorn University, Petromat

Language: English

Topic: Advanced battery technologies research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Responsible consumption and production, Affordable and clean energy

Open Access status: gold

Estimated APC paid: $1,935