Dual reaction strategy for in-situ conductivity enhancement to enable high-performing aqueous zinc-based micro-batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41690945.
- Also identified by DOI 10.1038/s41467-026-69317-z and PMC identifier 13018627.
- Licence recorded as CC BY-NC-ND.
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Abstract
Micro-batteries are promising candidates for powering various intelligent integrated applications. However, they typically rely on a single-cell reaction during charging and discharging cycles, limiting improvements in capacity and energy density. Here, we show an in situ conductivity enhancement-assisted double-cell reaction strategy to design high-performance Zn | |Bi<sub>2</sub>O<sub>3</sub>@Ag<sub>2</sub>O micro-batteries that integrate two sequential electrochemical reactions within a single microdevice. Unlike simply combining Zn | |Ag<sub>2</sub>O and Zn | |Bi<sub>2</sub>O<sub>3</sub> micro-batteries, this strategy leverages the in situ conductivity enhancement effect from the Ag<sub>2</sub>O conversion reaction in the first step to significantly boost the discharge capacity (an almost order-of-magnitude improvement compared to Zn | |Bi<sub>2</sub>O<sub>3</sub> micro-batteries alone) of the second conversion reaction, resulting in a total capacity 2.1 times the combined discharge capacities of the two individual micro-batteries. Consequently, the constructed microdevice achieves a high energy density of about 19000 μWh cm<sup>-2</sup> and the microdevice also exhibits a micro-supercapacitor-level or higher power density (above 23000 μW cm<sup>-2</sup>). This work challenges conventional micro-battery configurations and offers a strategy for constructing high-performance micro-power sources for intelligent integrated electronics.