Enhance electrochemical performance of LiFePO4 cathode material by Al-doped Li7La3Zr2O12 and carbon co-coating surface modification

被引：31

作者：

Bai, Yu-Xuan ^{[1
]}

Zhang, Jing ^{[1
]}

Yang, Yu-Bing ^{[1
]}

Yang, Rong ^{[2
]}

Yan, Ying-Lin ^{[2
]}

Wang, Juan ^{[1
]}

机构：

[1] Xian Univ Architecture & Technol, Sch Mech & Elect Engn, Shaanxi Key Lab Nanomat & Nanotechnol, Xian 710055, Peoples R China

[2] Xian Univ Technol, Inst Chem Power Sources, Int Res Ctr Composite & Intelligent Mfg Technol, Xian 710048, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 843卷

关键词：

Solid electrolyte; Al-doped; LiFePO4; Electrochemical performance; Diffusion rate; LITHIUM ION CONDUCTIVITY; SOLID-ELECTROLYTE; GARNET; BATTERY; DENSIFICATION; ADDITIVES;

D O I：

10.1016/j.jallcom.2020.154915

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A composite solid electrolyte based on Al-doped Li7-3xAlxLa3Zr2O12 (LALZO) was synthesized by the sol-gel method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were used to characterize Li7La3Zr2O12 (LLZO) precursors with different Al doping concentrations. The results show that LLZO precursor doped with 0.4 mol% Al (LALZO-4) has high stability and good crystallinity. Further, this composite solid electrolyte was co-coated with carbon to optimize the LiFePO4 battery. Electrochemical performance tests show that the LiFePO4/C battery with 5% LALZO-4 precursor (LFP-5) exists in the form of uniformly dispersed spherical particles, and exhibits excellent cycling stability and high rate performance. In addition, the LALZO-4 coating layer can increase the diffusion rate by reducing the charge transfer resistance. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：10

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