首页|Reinforced concrete-like Na3.5V1.5Mn0.5(PO4)3@graphene hybrids with hierarchical porosity as durable and high-rate sodium-ion battery cathode

Reinforced concrete-like Na3.5V1.5Mn0.5(PO4)3@graphene hybrids with hierarchical porosity as durable and high-rate sodium-ion battery cathode

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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.

Sodium-ion batteryPolyanionic cathodeHybrid structureInterconnected structureEnergy storage

Tao Long、Peng Chen、Bin Feng、Caili Yang、Kairong Wang、Yulei Wang、Can Chen、Yaping Wang、Ruotong Li、Meng Wu、Minhuan Lan、Wei Kong Pang、Jian-Fang Wu、Yuan-Li Ding

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College of Materials Science and Engineering,Hunan University,Changsha 410082,China

Department of Physics,Xiamen University,Xiamen 361005,China

College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China

Institute for Superconducting & Electronic Materials,Faculty of Engineering,University of Wollongong,Wollongong,NSW 2522,Australia

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国家自然科学基金湖南省自然科学基金高等学校学科创新引智计划(111计划)Australian Research Council(ARC)Echidna at the Australian centre for Neutron Scattering under Merit Programs

520721192023JJ50015D20015DP230100198beamtime:M13623

2024

10.1016/j.cclet.2023.109267

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(4)
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