Thermally Assisted Alkali/Zinc Ion Hybrid Battery for High Roundtrip Efficiency
ACS APPLIED ENERGY MATERIALS(2022)
摘要
The growth of renewable energy generation has necessitated electric energy storage (EES) systems. Batteries are the most promising small-scale EES system, given their portability, quick response time, and high compatibility with electrical devices. We present a thermally assisted K/Zn ion hybrid battery for high roundtrip efficiency. The battery contains a copper hexacyanoferrate (CuHCFe) cathode and a zinc metal anode with a discharging voltage of 1.75 V in a K/Zn ion hybrid aqueous electrolyte. The battery's roundtrip efficiency improved by 2.1-4.5% when cycled between 10 and 30 degrees C. Its discharging voltage and temperature coefficient improved dramatically when the K ion was replaced with a Rb ion. The proposed thermally assisted battery cycle can be used with various conventional batteries to reduce EES energy loss during charge/discharge cycles.
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关键词
low-grade heat harvesting,electrochemical system,Zn ion battery,Prussian blue analogues,high roundtrip efficiency
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