Abstract
Na4Fe3(PO4)2(P2O7)(NFPP)is currently drawing increased attention as a sodium-ion batteries(SIBs)cath-ode due to the cost-effective and NASICON-type structure features.Owing to the sluggish electron and Na+conductivities,however,its real implementation is impeded by the grievous capacity decay and infe-rior rate capability.Herein,multivalent cation substituted microporous Na3.9Fe2.9Al0.1(PO4)2(P2O7)(NFAPP)with wide operation-temperature is elaborately designed through regulating structure/interface coupled electron/ion transport.Greatly,the derived Na vacancy and charge rearrangement induced by trivalent Al3+substitution lower the ions diffusion barriers,thereby endowing faster electron transport and Na+mobility.More importantly,the existing Al-O-P bonds strengthen the local environment and alleviate the volume vibration during(de)sodiation,enabling highly reversible valence variation and structural evolution.As a result,remarkable cyclability(over 10,000 loops),ultrafast rate capability(200 C),and exceptional all-climate stability(-40-60 ℃)in half/full cells are demonstrated.Given this,the rational work might provide an actionable strategy to promote the electrochemical property of NFPP,thus unveiling the great application prospect of sodium iron mixed phosphate materials.
基金项目
国家自然科学基金(52325405)
国家自然科学基金(52261135632)
国家自然科学基金(U21A20284)
Science and Technology Foundation of Guizhou Province(QKHZC[2020]2Y037)
中央高校基本科研业务费专项中南大学项目(2023XQLH070)
中央高校基本科研业务费专项中南大学项目(2023XQLH069)
U19 station in the National Synchrotron Radiation Laboratory(NSRL)()
NETL
NSTL
万方数据