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NaV_3O_8/poly(3,4-ethylenedioxythiophene) composites as high-rate and long-lifespan cathode materials for reversible sodium storage
Sodium-ion batteries have received a surge of interests for the alternatives to lithium-ion batteries due to their abundant reserves and low cost.The quest of reliable and high-performance cathode materials is crucial to future Na storage technologies.Herein,poly(3,4-ethylenedioxythiophene)(PEDOT) was successfully introduced to NaV_3O_8 via in situ oxidation polymerization,which can effectively enhance electron conductivity and ionic diffusion of NaV_3O_8 material.As a result,these NaV_3O_8@-PEDOT composites exhibit a significantly improved electrochemical performance including cycle stability and rate performance.In particular,NaV_3O_8@20 wt% PEDOT composite demonstrates better dispersibility and lower charge transfer resistance compared with bare NaV_3O_8,which delivers the first discharge capacity of 142 mAh-g~(-1)and holds about 128.7 mAh·g~(-1) after 300 cycles at a current density of 120 mA·g~(-1).Even at a high current density of 300 mA·g~(-1),a high reversible capacity of 99.6 mAh·g~(-1) is revealed.All these consequences suggest that NaV_3O_8@20 wt% PEDOT composite may be a promising candidate to serve as a high-rate and long-lifespan cathode material for sodium-ion batteries.
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Rare Metals
2020年08期

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