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首页> 外文期刊>Advanced energy materials >Ethylene Carbonate-Free Propylene Carbonate-Based Electrolytes with Excellent Electrochemical Compatibility for Li-Ion Batteries through Engineering Electrolyte Solvation Structure
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Ethylene Carbonate-Free Propylene Carbonate-Based Electrolytes with Excellent Electrochemical Compatibility for Li-Ion Batteries through Engineering Electrolyte Solvation Structure

机译：通过工程电解质溶剂化结构具有优异的锂离子电池的碳酸亚碳酸亚丙烯碳酸酯基电解质

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摘要

Propylene carbonate (PC) -based electrolytes have many desirable advantageous properties compared to the currently used ethylene carbonate (EC) -based electrolytes for lithium ion batteries, however, their poor compatibility with the graphite anode hinders its applications. Here, a facile and effective strategy to make electrochemically compatible PC-based electrolytes by use of a weakly coordinating diethyl carbonate co-solvent to induce PF6- anions into the solvation shell of Li+ to form an anion-induced ion-solvent-coordinated (AI-ISC) structure is reported. Such an AI-ISC structure can lead to an increase of the lowest unoccupied molecular orbital energy level of the electrolyte, therefore considerably improving the reduction tolerance of the PC solvent. Furthermore, by using the film-forming additive (fluoroethylene carbonate, FEC), an electrochemically stable, EC-free PC-based electrolyte, which enables reversible Li+ intercalation on the graphite electrode is obtained. The graphite/LiNi0.5Mn0.3Co0.2O2 pouch cells using this PC-based electrolyte exhibit very similar room-temperature electrochemical performance to those using conventional EC-based electrolytes and excellent low-temperature performance. This work provides a new approach to make EC-free electrolytes with a similar AI-ISC structure but without the need for a high concentration of Li salt of highly concentrated electrolytes, which may bring new insights in the development of advanced electrolyte systems for wide battery applications.
机译：与当前使用的乙烯碳酸酯（EC）用于锂离子电池的电解质相比，基于碳酸丙烷（PC）的电解质具有许多所需的有利性质，然而，它们与石墨阳极的差相当阻碍其应用。这里，通过使用弱协调的碳酸二乙酯共溶剂来制备电化学相容的基于PC电解质，以诱导PF6 - 阴离子的Li +的溶剂化壳，形成阴离子诱导的离子溶剂 - 协调（AI报告了-isc结构。这种AI-ISC结构可以导致电解质的最低未占用的分子轨道能级的增加，因此显着提高了PC溶剂的降低耐受性。此外，通过使用成膜添加剂（氟碳酯，FEC），获得电化学稳定的EC-PC基电解质，其能够在石墨电极上实现可逆的Li +嵌入。使用该基于PC的电解质的石墨/ LINI0.5MN0.3CO0.2O2袋细胞对使用常规EC基电解质和优异的低温性能具有非常相似的室温电化学性能。这项工作提供了一种新方法，使具有类似的AI-ISC结构的无菌电解质，但不需要高浓度的高度浓缩电解质的Li盐，这可能会带来新的洞察电池技术的开发中的新见解应用程序。

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  • 来源
    《Advanced energy materials》 |2021年第19期|2003905.1-2003905.9|共9页
  • 作者

    Liu Xingwei; Shen Xiaohui; Li Hui; Li Peng; Luo Laibing; Fan Haiman; Feng Xiangming; Chen Weihua; Ai Xinping; Yang Hanxi; Cao Yuliang;

  • 作者单位

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    ShenZhen SaiJiaoYang Energy & Sci Technol Co Ltd Baolong 2nd Rd Shenzhen 518116 Peoples R China;

    Zhengzhou Univ Coll Chem & Mol Engn Zhengzhou 450001 Peoples R China;

    Zhengzhou Univ Coll Chem & Mol Engn Zhengzhou 450001 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

    Wuhan Univ Coll Chem & Mol Sci Hubei Key Lab Electrochem Power Sources Wuhan 430072 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    EC-free; graphite anodes; ion-solvent-coordinated structure; lithium ion batteries; propylene carbonate electrolytes;

    机译：无EC;石墨阳极;离子溶剂 - 协调结构;锂离子电池;碳酸亚丙酯电解质;

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