Journal
ACS APPLIED ENERGY MATERIALS
Volume 4, Issue 9, Pages 9758-9765Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.1c01832
Keywords
energy storage; sodium-ion batteries; cathode materials; intercalation cathode; Prussian blue analogue; sodium-vanadium hexacyanoferrate
Funding
- Swiss Science Foundation SNSF [200021_175745]
- SCCER network (Swiss Competence Centre for Heat and Electricity Storage)
- Swiss National Science Foundation (SNF) [200021_175745] Funding Source: Swiss National Science Foundation (SNF)
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Sodium-vanadium hexacyanoferrate shows high and stable working potential in a liquid organic electrolyte, achieving excellent capacity retention after 200 cycles. Vanadium substitution in the Prussian blue crystal structure improves cycle life and represents progress in developing cathode materials for Na-ion batteries.
Sodium-ion (Na-ion) batteries have been attracting great interest because of a wide range of potential applications and sodium abundance. Yet, the performance of Na-ion electrode materials needs improvement to be able to compete with lithium-ion electrode materials. Here, sodium-vanadium hexacyanoferrate (NaVHCF) is investigated as a cathode active material in rechargeable Na-ion batteries. We explore the electrochemical performance of NaVHCF in a liquid organic electrolyte and demonstrate a high and very stable working potential of around 3.3 V vs Na+/Na, achieving excellent capacity retention of 73% after 200 cycles. Vanadium substitution in a Prussian blue crystal structure can improve the cycle life by acting as a pillar in interstitial spaces. These results represent a step forward in the development of cathode materials for Na-ion batteries.
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