High-Rate and Long-Life Sodium-Ion Batteries Based on Sponge-like Three-Dimensional Porous Na-Rich Ferric Pyrophosphate Cathode Material
journal contributionposted on 14.01.2019, 00:00 by Renming Zhan, Youquan Zhang, Hao Chen, Qiuju Xu, Qianru Ma, Wei Gao, Tingting Yang, Jian Jiang, Shujuan Bao, Maowen Xu
Sponge-like three-dimensional porous carbon-encapsulated Na3.32Fe2.34(P2O7)2 nanoparticles (labeled to NFPO@SC) were manufactured by a sol–gel method followed by multistage calcinations and utilized as the cathode material for sodium-ion batteries. The excellent electrochemical performance of the NFPO@SC cathode can be attributed to its unique porous structure, which facilitates electrolyte penetration, reduces the diffusion path of sodium ions, and increases electronic conductivity. In addition, the full battery is assembled by NFPO@SC and hard carbon, which are employed as cathode and anode electrodes, respectively. The full battery delivers a high discharge capacity (112.2 mA h g–1 at 0.5 C) and maintains 93.9% stable capacity over 1000 cycles at 5 C.
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1000 cyclescarbon-encapsulated Na 3.32 Fe 2.34sodium-ion batteriessodium ionscapacitydiffusion path2 nanoparticlesP 2 O 7NFPOanode electrodeselectrolyte penetrationLong-Life Sodium-Ion BatteriesSponge-like Three-Dimensional Porous Na-Rich Ferric Pyrophosphate Cathode Material Sponge-like0.5 Celectrochemical performancecathode material5 C