Abstract
Realizing high-rate capability and high-efficiency utilization of polyanionic cathode materials is of great importance for practical sodium-ion batteries(SIBs)since they usually suffer from extremely low elec-tronic conductivity and limited ionic diffusion kinetics.Herein,taking Na3.5V1.5Mn0.5(PO4)3(NVMP)as an example,a reinforced concrete-like hierarchical and porous hybrid(NVMP@C@3DPG)built from 3D graphene("rebar")frameworks and in situ generated carbon coated NVMP("concrete")has been devel-oped by a facile polymer assisted self-assembly and subsequent solid-state method.Such hybrids deliver superior rate capability(73.9 mAh/g up to 20 C)and excellent cycling stability in a wide temperature range with a high specific capacity of 88.4 mAh/g after 5000 cycles at 15 C at room temperature,and a high capacity retention of 97.1％after 500 cycles at 1 C(-20 ℃),and maintaining a high reversible capacity of 110.3 mAh/g in full cell.This work offers a facile and efficient strategy to develop advanced polyanionic cathodes with high-efficiency utilization and 3D electron/ion transport systems.
基金项目
国家自然科学基金(52072119)
湖南省自然科学基金(2023JJ50015)
高等学校学科创新引智计划(111计划)(D20015)
Australian Research Council(ARC)(DP230100198)
Echidna at the Australian centre for Neutron Scattering under Merit Programs(beamtime:M13623)
NETL
NSTL
万方数据