Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 12, Pages 6719-6724Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01551
Keywords
Li-ion batteries; layered cathodes; Na2Mn3O7; capacity; insertion mechanism
Funding
- Shell Technology Centre (STC) Bangalore
- Department of Science and Technology (DST, Govt. of India)
- Science and Engineering Research Board (SERB, Govt. of India) [PDF/2015/00217]
- SERB [ECR/2015/000525]
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Exploring Mn-based battery insertion materials, layered Na2Mn3O7 was synthesized via single pot solid-state method. Rietveld analysis confirmed the formation of triclinic structured Na2Mn3O7 with P-1 symmetry. With no further optimization, the as-synthesized Na2Mn3O7 was found to be an efficient host for Li+ (de)intercalation. Na2Mn3O7 delivered a discharge capacity of similar to 160 mA h g(-1) by altering the redox couple Mn(IV)/Mn(III) with a nominal voltage of 3.12 V (vs Li/Li+). Interestingly, the first discharge of pristine Na2Mn3O7 led to the formation of LixNa2Mn3O7 (2 < x < 3) having completely different phase similar to the LiCoO2 structure. Lithiation triggered phase transformation from triclinic (P-1) to trigonal (R-3m) structure. This electrochemically reformed structure imparts stability to [Mn3O7](infinity)(-2) building layers, preventing irreversible capacity loss. Underlying a single-phase (solid-solution) redox mechanism, Na2Mn3O7 acts as a robust cathode material for Li-ion batteries.
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