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首页> 外文期刊>Advanced energy materials >Viscoelastic and Nonflammable Interface Design–Enabled Dendrite-Free and Safe Solid Lithium Metal Batteries
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Viscoelastic and Nonflammable Interface Design–Enabled Dendrite-Free and Safe Solid Lithium Metal Batteries

机译：粘弹性和非易燃接口设计-启用无枝晶且安全的固态锂金属电池

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摘要

Herein, a composite polymer electrolyte with a viscoelastic and nonflammable interface is designed to handle the contact issue and preclude Li dendrite formation. The composite polymer electrolyte (cellulose acetate/polyethylene glycol/Li1.4Al0.4Ti1.6P3O12) exhibits a wide electrochemical window of 5 V (vs Li+/Li), a high Li+ transference number of 0.61, and an excellent ionic conductivity of above 10(-4) S cm(-1) at 60 degrees C. In particular, the intimate contact, low interfacial impedance, and fast ion-transport process between the electrodes and solid electrolytes can be simultaneously achieved by the viscoelastic and nonflammable layer. Benefiting from this novel design, solid lithium metal batteries with either LiFePO4 or LiCoO2 as cathode exhibit superior cyclability and rate capability, such as a discharge capacity of 157 mA h g(-1) after 100 cycles at C/2 and 97 mA h g(-1) at 5C for LiFePO4 cathode. Moreover, the smooth and uniform Li surface after long-term cycling confirms the successful suppression of dendrite formation. The viscoelastic and nonflammable interface modification of solid electrolytes provides a promising and general strategy to handle the interfacial issues and improves the operative safety of solid lithium metal batteries.
机译：在本文中，具有粘弹性和不易燃界面的复合聚合物电解质被设计来处理接触问题并防止锂枝晶的形成。复合聚合物电解质（醋酸纤维素/聚乙二醇/Li1.4Al0.4Ti1.6P3O12）具有5 V的宽电化学窗口（相对于Li + / Li），0.6 +的高Li +迁移率和高于10的优异离子电导率（-4）在60摄氏度时为S cm（-1）。尤其是，电极和固体电解质之间的紧密接触，低界面阻抗以及快速的离子传输过程可以通过粘弹性和不可燃层同时实现。得益于这种新颖的设计，以LiFePO4或LiCoO2为阴极的固态锂金属电池表现出出色的循环能力和倍率能力，例如在C / 2和97 mA hg（-）下循环100次后的放电容量为157 mA hg（-1）。 1）在5C下使用LiFePO4阴极。此外，经过长时间循环后，光滑且均匀的锂表面证实了成功抑制枝晶形成。固体电解质的粘弹性和不易燃界面改性为解决界面问题和提高固体锂金属电池的操作安全性提供了一种有前途的通用策略。

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  • 来源
    《Advanced energy materials》 |2019年第13期|1803854.1-1803854.7|共7页
  • 作者

    Ma Qiang; Zeng Xian-Xiang; Yue Junpei; Yin Ya-Xia; Zuo Tong-Tong; Liang Jia-Yan; Deng Qi; Wu Xiong-Wei; Guo Yu-Guo;

  • 作者单位

    Hunan Agr Univ, Coll Agron, Coll Sci, Changsha 410128, Hunan, Peoples R China|Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China;

    Hunan Agr Univ, Coll Agron, Coll Sci, Changsha 410128, Hunan, Peoples R China;

    Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China;

    Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China;

    Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China;

    Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China;

    Hunan Agr Univ, Coll Agron, Coll Sci, Changsha 410128, Hunan, Peoples R China|Hunan Prov Yin Feng New Energy Co LTD, Changsha 410000, Hunan, Peoples R China;

    Hunan Agr Univ, Coll Agron, Coll Sci, Changsha 410128, Hunan, Peoples R China|Chinese Acad Sci, CAS Res Educ Ctr Excellence Mol Sci, Inst Chem, CAS Key Lab Mol Nanostruct & Nanotechnol, Beijing 100190, Peoples R China|Hunan Prov Yin Feng New Energy Co LTD, Changsha 410000, Hunan, Peoples R China;

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  • 关键词

    composite polymer electrolytes; dendrite-free; lithium metal batteries; viscoelastic and nonflammable interfaces;

    机译：复合聚合物电解质;无树突;锂金属电池;粘弹性和不易燃界面;

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