Journal
ACS APPLIED ENERGY MATERIALS
Volume 3, Issue 6, Pages 5728-5733Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00669
Keywords
operando; XRD; Prussian blue; Jahn-Teller distortion; manganese; synchrotron radiation; batteries; Li ion
Funding
- Initiative and Networking Fund of the Helmholtz Association within the Network of Excellence on post-Lithium batteries [ExNet-0035]
- Helmholtz Association
- [20180360]
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Manganese hexacyanoferrate (MnHCF) has received increasing attention as a positive electrode for either lithium- or sodium-ion storage owing to its high specific capacity among the Prussian blue analogues (PBAs). During ion release, the material undergoes the Jahn-Teller distortion arising from the oxidation of manganese to its trivalent state. Typically, the Jahn-Teller distortion is reported to destabilize the host structure of electrode materials based on layered and spinel manganese oxides, resulting in volume changes in the order of 10-20%, which deteriorate the cycle performance. Herein, the effect of such a distortion on MnHCF via operando, synchrotron powder diffraction is reported. Surprisingly, only a minor volume change (about 2%) is recorded upon cycling the electrode material against lithium, highlighting the major role of the PBA framework in stabilizing the PBAs' structures.
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