Na4MnCr(PO4)3 with a Dual Conductive Network for Sodium‐Ion Batteries

Author:

Yu Sijie1,Chen Yuwei1,Huang Yangyang1,Sun Huabin2,Xie Yu1,Du Sihao1,Luo Wei1ORCID

Affiliation:

1. Institute of New Energy for Vehicles School of Materials Science and Engineering Tongji University Shanghai 201804 China

2. Hubei Provincial Collaborative Innovation Center for New Energy Microgrid College of Materials and Chemical Engineering China Three Gorges University Yichang Hubei 443002 China

Abstract

AbstractNASICON (NAtrium Super Ionic CONductor)‐structured Na4MnCr(PO4)3 has attracted attention as a promising cathode for sodium‐ion batteries due to its high operating voltage and specific capacity contributed by multielectron reactions. Unfortunately, its intrinsic low electronic conductivity significantly hinders the release of specific capacity and rate capability, preventing its practical application. Herein, a carbon layer with dual conductive networks connected by chain‐like Ketjen black (KB) is built on the surface of Na4MnCr(PO4)3 material. This novel Na4MnCr(PO4)3/C@KB composite material exhibits improved rate capability of 61.2 mAh g−1 at 2 C compared to 19.5 mAh g−1 of Na4MnCr(PO4)3/C and high reversible capacity of 88.0 mAh g−1 at 1 C with 73% capacity retention after 100 cycles. The enhanced electrochemical performance can be ascribed to an increase of electronic conductivity enabled by the dual conductive 3D network construction and an adequate infiltration of electrolyte by substantial pores existence in carbon layer. A promising dual conductive network design strategy is demonstrated here for improving the performance of NASICON‐structured cathodes.

Funder

National Natural Science Foundation of China

Fundamental Research Funds for the Central Universities

Publisher

Wiley

Subject

General Environmental Science,Renewable Energy, Sustainability and the Environment

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