An ultrathin, strong, flexible composite solid electrolyte for high-voltage lithium metal batteries,Journal of Materials Chemistry A

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An ultrathin, strong, flexible composite solid electrolyte for high-voltage lithium metal batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-10 , DOI: 10.1039/d0ta05644h
Ke Liu _{1,

2,

3,

4} , Maochun Wu _{1,

2,

3,

4} , Haoran Jiang _{1,

2,

3,

4} , Yanke Lin _{1,

2,

3,

4} , Tianshou Zhao _{1,

2,

3,

4}

Affiliation

The urgent need for safe, energy-dense electrochemical storage devices calls for high-voltage solid-state lithium metal batteries. However, state-of-the-art solid-state electrolytes are hindered by two critical issues: the narrow electrochemical window, which prevents the pairing of a lithium metal anode with a high-voltage cathode, and the large thickness which leads to a huge internal resistance and a significant sacrifice in energy density. To simultaneously address both the issues, in this work we develop a poly(acrylonitrile) (PAN)–LiClO₄–boron nitrite nanoflake (BNNF) composite electrolyte modified with a BNNF layer (PBCEB). The PAN–LiClO₄–BNNF composite can sustain an oxidation voltage of up to 4.5 V vs. Li/Li⁺ while the BNNF modifying layer prevents the PAN–LiClO₄–BNNF from the reduction reaction with the lithium metal anode. In the meantime, thanks to the BNNFs, the PAN–LiClO₄–BNNF possesses a strong tensile strength (16.0 MPa) and Young's modulus (563.7 MPa), which enables the PBCEB to be as thin as 13.5 μm (12.0 μm for the PAN–LiClO₄–BNNF and 1.5 μm for the BNNF modifying layer). As a result, a Li/PBCEB/LiNi_0.8Co_0.1Mn_0.1O₂ full battery delivers a high specific capacity of 173.6 mA h g⁻¹ at 0.2C and achieves a remarkable capacity retention of 68.1% after 350 cycles at 1C. This work provides an effective approach to develop high-performance composite solid electrolytes for high-voltage lithium metal batteries.

中文翻译：

超薄，坚固，柔性的复合固体电解质，用于高压锂金属电池

对安全，能量密集的电化学存储设备的迫切需求需要高压固态锂金属电池。但是，现有技术的固态电解质受到两个关键问题的阻碍：狭窄的电化学窗口（可防止锂金属阳极与高压阴极配对）以及较大的厚度（导致厚度过大）内部电阻和能量密度的重大牺牲。为了同时解决这两个问题，在这项工作中，我们开发了用BNNF层（PBCEB）改性的聚（丙烯腈）（PAN）-LiClO _4-亚硝酸硼纳米片（BNNF）复合电解质。PAN-LiClO ₄ -BNNF复合材料相对于Li / Li ⁺可以承受高达4.5 V的氧化电压而BNNF修饰层可防止PAN–LiClO ₄ –BNNF与锂金属阳极发生还原反应。同时，由于使用了BNNF，PAN–LiClO ₄ –BNNF具有很强的抗拉强度（16.0 MPa）和杨氏模量（563.7 MPa），这使得PBCEB的厚度可薄至13.5μm（PAN为12.0μm） –LiClO ₄ –BNNF和1.5μm用于BNNF修改层）。结果，Li / PBCEB / LiNi _0.8 Co _0.1 Mn _0.1 O ₂充满电池可提供173.6 mA hg ^-1的高比容量在0.2C的温度下，在1C的温度下经过350次循环后，容量保持率达到了68.1％。这项工作为开发用于高压锂金属电池的高性能复合固体电解质提供了有效的方法。

更新日期：2020-09-22

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