Constructing Li-Rich Artificial SEI Layer in Alloy-Polymer Composite Electrolyte to Achieve High Ionic Conductivity for All Solid-State Lithium Metal Batteries
作者:Liu, YX (Liu, Yuxuan)[ 1 ] ; Hu, RZ (Hu, Renzong)[ 1 ] ; Zhang, DC (Zhang, Dechao)[ 1 ] ; Liu, JW (Liu, Jiangwen)[ 1 ] ; Liu, F (Liu, Fang)[ 2 ] ; Cui, J (Cui, Jie)[ 3 ] ; Lin, ZP (Lin, Zuopeng)[ 1 ] ; Wu, JS (Wu, Jinsong)[ 2 ] ; Zhu, M (Zhu, Min)[ 1 ]
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ADVANCED MATERIALS
卷: 33 期: 11
文献号: 2004711
DOI: 10.1002/adma.202004711
出版年: MAR 2021
在线发表日期: JAN 2021
文献类型:Article
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摘要
To achieve high ionic conductivity for solid electrolyte, an artificial Li-rich interface layer of about 60 nm thick has been constructed in polymer-based poly(ethylene oxide)-lithium bis(trifluoromethanesulfonyl)imide composite solid electrolyte (briefly noted as PEOm) by adding Li-based alloys. As revealed by high-resolution transmission electron microscopy and electron energy loss spectroscopy, an artificial interface layer of amorphous feature is created around the Li-based alloy particles with the gradient distribution of Li across it. Electrochemical analysis and theoretical modeling demonstrate that the interface layer provides fast ion transport path and plays a key role in achieving high and stable ionic conductivity for PEOm-Li21Si5 composite solid electrolyte. The PEOm-5%Li21Si5 composite electrolyte exhibits an ionic conductivity of 3.9 x 10(-5) S cm(-1) at 30 degrees C and 5.6 x 10(-4) S cm(-1) at 45 degrees C. The LiFePO4 | PEOm-5%Li21Si5 | Li all-solid-state batteries could maintain a stable capacity of 129.2 mA h g(-1) at 0.2 C and 30 degrees C after 100 cycles, and 111.3 mA h g(-1) after 200 cycles at 0.5 C and 45 degrees C, demonstrating excellent cycling stability and high-rate capability.
关键词
作者关键词:all solid-state lithium ion battery; artificial solid electrolyte interface; composite polymer electrolytes; lithium metal batteries; lithium-silicon alloys; poly(ethylene oxide)
作者信息
通讯作者地址:
South China University of Technology South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.
通讯作者地址: Hu, RZ; Zhu, M (通讯作者)
显示更多 South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.
地址:
显示更多 [ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
显示更多 [ 2 ] Wuhan Univ Technol, Nanostruct Res Ctr, Wuhan 430070, Peoples R China
显示更多 [ 3 ] South China Univ Technol, Anal & Test Ctr, Guangzhou 510640, Peoples R China
电子邮件地址:msrenzonghu@scut.edu.cn; memzhu@scut.edu.cn
基金资助致谢
基金资助机构显示详情 授权号
National Natural Science Foundation of China (NSFC)
51621001
51822104
51831009
National Key Research and Development Program
2016YFA0202603
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出版商
WILEY-V C H VERLAG GMBH, POSTFACH 101161, 69451 WEINHEIM, GERMANY
期刊信息
Impact Factor (影响因子): Journal Citation Reports
类别 / 分类
研究方向:Chemistry; Science & Technology - Other Topics; Materials Science; Physics
Web of Science 类别:Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter