Regulating local chemical environment in O3-type layered sodium oxides by dual-site Mg2+/B3+substitution achieves durable and high-rate cathode

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外文摘要：The O3-Na0.85Ni0.2Fe0.4Mn0.4O2 layered oxide cathode material possesses the advantages of high spe-cific capacity,low cost,and simple synthesis.However,sluggish kinetics and complicated phase tran-sition caused by the large size difference between Na+and tetrahedral gaps lead to poor rate and cy-cling performance.Therefore,a scalable and feasible strategy was proposed to modulate local chem-ical environment by introducing Mg2+and B3+into O3-Na0.85Ni0.2Fe0.4Mn0.4O2,which can distinctly improve kinetic transport rate as well as electrochemical performance.The capacity retention of O3-(Na0.82Mg0.04)(Ni0.2Fe0.4Mn0.4)B0.02O2(NFMB)increases from 43.3％and 12.4％to 89.5％and 89.0％at 1 C and 3 C after 200 cycles,respectively.Moreover,the electrode still delivers high rate capacity of 93.9 mAh/g when current density increases to 10 C.Mg2+ions riveted on Na layer act as a"pillar"to stabi-lize crystal structure and inhibit structural change during the desodiumization process.B3+ions entering tetrahedral interstice of the TM layer strengthen the TM-O bond,lower Na+diffusion energy barrier and inhibits the slip of TM layer.Furthermore,the assembled full batteries with the modified cathode ma-terial deliver a high energy density of 278.2 Wh/kg with commercial hard carbon as anode.This work provides a strategy for the modification of high-performance SIB layered oxide materials to develop the next-generation cost-effective energy storage grid systems.

外文关键词：

Sodium-ion batteriesLayered cathode materialDFT calculationLocal chemistry environmentMagnesium/boron co-substitution

作者：

Guangchang Yang、Shenglong Yang、Jinlian Yu、Yishun Xie、Chunlei Tan、Feiyan Lai、Qianqian Jin、Hongqiang Wang、Xiaohui Zhang

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作者单位：

Guangxi Key Laboratory of Low Carbon Energy Materials,Guangxi New Energy Ship Battery Engineering Technology Research Center,Guangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and Devices,School of Chemistry and Pharmaceutical Sciences,Guangxi Normal University,Guilin 541004,China

College of Materials and Chemical Engineering,Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization,Hezhou University,Hezhou 542899,Ch

College of Materials and Chemical Engineering,Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization,Hezhou University,Hezhou 542899,China

School of Civil Engineering and Architecture,Center for the Structure of Advanced Matter,School of Electronic Engineering,Guangxi University of Science and Tech

School of Civil Engineering and Architecture,Center for the Structure of Advanced Matter,School of Electronic Engineering,Guangxi University of Science and Technology,Institute of New Building Materials and Engineering Applications,Liuzhou 545006,China

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出版年：

2024

DOI：

10.1016/j.cclet.2024.109722

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(9)