ACS Applied Energy Materials · 2019 · 23 citations · 29 references
EngineeringUltrahigh Rate CapabilityNa0.44mno2 ParticlesChemical EngineeringSodium BatterySodium-ion BatteriesMaterials ScienceMaterials EngineeringBattery Electrode MaterialsSurface ElectrochemistryAdvanced Electrode MaterialEnergy StorageSolid-state BatteryElectrochemistryLi-ion Battery MaterialsSurface ScienceApplied PhysicsCathode MaterialsSurface EngineeringTunnel-type Na0.44mno2Electrochemical Energy StorageBatteriesCycling StabilityManganese Dissolution
The tunnel-type Na0.44MnO2 as a potential cathode for sodium-ion batteries suffers from issues of manganese dissolution and surface layer outgrowth during cycling, which lead to poor electrochemical performances. It is found by ex situ scanning and transmission electron microscopies that applying a coating of NASICON-type NaTi2(PO4)3 (NTP) on the surface of Na0.44MnO2 particles can markedly suppress the surface layer growth phenomenon and improve the cycling stability and rate capability of this cathode material. The 2 wt % NTP-coated sample delivers a capacity retention of 99.0% after 100 cycles at 1C and a capacity of 82.2 mAh g–1 at 20C (71% of 0.1C capacity).
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