Surface Spinel-Coated and Polyanion-Doped Co-Free Li-Rich Layered Oxide Cathode for High-Performance Lithium-Ion Batteries - Details

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Abstract：

Li-rich　layered　oxides　(LLOs)　are　supposed　to　be　the　most　competitive　cathode　materials　for　lithium-ion　batteries　(LIBs),　because　of　the　high　theoretical　specific　capacities　(>250　mAh　g-1).　However,　there　are　some　inherent　inferiorities,　such　as　the　low　initial　Coulombic　efficiency　(ICE)　and　the　rapid　capacity/voltage　decay,　that　hinder　the　large-scale　commercial　applications　of　LLOs.　Herein,　we　successfully　obtained　spinel-coated　and　phosphate-doped　Co-free　Li-rich　layered　oxides　(Co-free　LLOs)　by　cotreatment　methods,　using　weakly　acidic　and　alkalinity　(NH4H2PO4solution),　which　could　effectively　improve　the　electrochemical　performance.　The　spinel　coating　could　not　only　accelerate　the　movement　of　Li+but　also　restrain　O2release,　while　the　doping　PO43-could　inhibit　the　transition-metal　(TM)　migration　between　the　oxygen　octahedral　site　and　the　oxygen　tetrahedral　site.　The　optimized　Co-free　LLOs　cathode　treated　with　3%　NH4H2PO4solution　could　deliver　a　high　ICE　of　88%　and　a　high　discharge　capacity　up　to　159.5　mAh　g-1after　500　cycles　at　1C　(1C　=　250　mA　g-1).　Moreover,　the　voltage　fading　decreases　from　0.64　mV　to　0.32　mV　per　cycle　during　cycling.　This　work　provides　new　insights　for　developing　high-performance　Co-free　LLOs　cathode　materials.　©　2022　American　Chemical　Society.　All　rights　reserved.

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[ 1 ] [Chang, Z.]College of Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, China
[ 2 ] [Zhang, Y.]Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
[ 3 ] [He, W.]College of Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, China
[ 4 ] [Wang, J.]Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
[ 5 ] [Zheng, H.]College of Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, China
[ 6 ] [Qu, B.]Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China
[ 7 ] [Qu, B.]Shenzhen Research Institute, Xiamen University, Shenzhen, 518000, China
[ 8 ] [Wang, X.]College of Physics and Information Engineering, Institute of Micro-Nano Devices and Solar Cells, Fuzhou University, Fuzhou, 350108, China
[ 9 ] [Xie, Q.]College of Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, China
[ 10 ] [Xie, Q.]Shenzhen Research Institute, Xiamen University, Shenzhen, 518000, China
[ 11 ] [Peng, D.-L.]College of Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, Xiamen University, Xiamen, 361005, China

Reprint 's Address：

[Xie, Q.]College of Materials, China; ; College of Materials, China; 电子邮件: dlpeng@xmu.edu.cn Qu, B.; Pen-Tung Sah Institute of Micro-Nano Science and Technology, China; 电子邮件: bhqu@xmu.edu.cn

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xieqsh@xmu.edu.cn Peng, D.-L.

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Industrial and Engineering Chemistry Research

ISSN： 0888-5885

Year： 2022

Issue： 22

Volume： 61

Page： 7464-7473

4 . 2

JCR@2022

3 . 8 0 0

JCR@2023

ESI HC Threshold：74

JCR Journal Grade：2

CAS Journal Grade：3

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ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 3

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