AI Article Synopsis
- Solid-state metallic potassium batteries (SSMPBs) are gaining attention as alternatives to lithium batteries, but face challenges like low ionic conductivity and high interfacial resistance.
- Researchers achieved improved performance by using in situ ring-opening polymerization with a plasticizer and catalyst, resulting in short-chain polyether electrolytes that significantly enhance ionic conductivity.
- The developed SSMPBs show a high discharge capacity of 69 mAh/g at 100 mA/g and 88.8% capacity retention after 100 cycles, outperforming previous SSMPB studies.
Article Abstract
Solid-state metallic potassium batteries (SSMPBs) afresh have attracted incremental attention because of their potential to supplement solid-state metallic lithium batteries. However, SSMPBs suffer poor electrochemical performances due to the low ionic conductivity of solid electrolytes and huge electrode/electrolyte interfacial resistance. Herein, high-rate SSMPBs are achieved by in situ ring-opening polymerization of 1,3-dioxolane with succinonitrile as a plasticizer and Al(OTf) as the catalyst, where the succinonitrile enables short-chain polyether electrolytes. The in situ polymerized electrolytes deliver a high ionic conductivity of 4.5 × 10 S cm at room temperature and excellent stabilities at high oxidation potentials (4.2 V vs K/K) and against metallic K anodes. All these result in SSMPBs with a discharge capacity of 69 mAh g under a high rate of 100 mA g and a retention of 88.8% after 100 cycles, and the rate and capacity retention are higher than those in previous work on SSMPBs.
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| http://dx.doi.org/10.1021/acs.nanolett.4c04164 | DOI Listing |
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