Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 3, Pages 2780-2785Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c03368
Keywords
low-grade heat harvesting; electrochemical system; Zn ion battery; Prussian blue analogues; high roundtrip efficiency
Funding
- Academic Research Fund Tier 2 from the Ministry of Education, Singapore [MOE2019-T2-1-122]
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Batteries are the most promising small-scale energy storage (EES) system due to their portability, quick response time, and high compatibility with electrical devices. A thermally assisted K/Zn ion hybrid battery is proposed, which shows improved roundtrip efficiency at different temperatures. Applying this research to conventional battery cycles can reduce energy loss.
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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