Tree root-inspired structural electrolyte for laminated carbon fiber reinforced composites with high energy density and mechanically-robust properties
Tree root-inspired structural electrolyte for laminated carbon fiber reinforced composites with high energy density and mechanically-robust properties
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DOI：
10.1016/j.cej.2022.137828
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发表时间：
2022
影响因子：
15.1
通讯作者：
X. Liu;Qigang Han;Jiahui Wang;Mingdi Shi;C. Liu
中科院分区：
文献类型：
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作者：
X. Liu;Qigang Han;Jiahui Wang;Mingdi Shi;C. Liu
具有高离子电导率的机械坚固的电解质是结构储能装置的先决条件，其可以同时储存电化学能和承受机械负载。然而，合适的结构电解质很少被利用。本文受树根网络的启发，结合聚（偏氟乙烯-共-六氟丙烯）（PVHF）基聚合物的高离子导电性和玻璃纤维织物的高机械强度，设计并制备了用于结构锌离子电池的结构电解质GF/PVHF/KL-Z。该结构电解质显示出4.4*10-4S cm− 1的离子电导率和优异的机械性能（拉伸强度为110 MPa），能够实现快速Zn 2+传输和有效抑制锌枝晶。当用结构电解质GF/PVHF/KL-Z制造碳纤维增强层压结构锌离子电池时，结构装置提供高机械强度（584.5 MPa的弯曲强度）和159.0 Wh kg-1的能量密度。在500次循环后，容量保持率约为94.6%，库仑效率（CE）接近100%。重要的是，现场机械-电化学测试进一步验证了结构电池的多功能性能。总的来说，这项工作开辟了一条途径，开发安全，低成本的纤维增强仿生结构电解质的结构储能装置具有优异的机械和电化学性能。
Mechanically sturdy electrolytes with high ionic conductivity are the prerequisite for structural energy storage devices, which can store electrochemical energy and withstand mechanical loads, simultaneously. However, suitable structural electrolytes are rarely exploited. Herein, inspired by a tree root network, integrated with high ionic conductivity of poly(vinylidene fluoride-co-hexafluoropropylene) (PVHF) based polymer and high mechanical strength of glass fiber fabric, the structural electrolyte GF/PVHF/KL-Z is designed and fabricated for structural Zn-ions batteries. The structural electrolyte demonstrates the ionic conductivity of 4.4*10-4S cm−1and excellent mechanical properties (110 MPa in tensile strength), enabling fast Zn2+transmission and effective suppression of zinc dendrites. When carbon fiber reinforced laminated structural Zn-ion batteries were fabricated with structural electrolyte GF/PVHF/KL-Z, the structural devices delivered high mechanical strength (bending strength of 584.5 MPa) and energy density of 159.0 Wh kg−1. And after 500 cycles, the capacity retention of about 94.6% is also realized with Coulombic efficiency (CE) of nearly 100%. Importantly, the in situ mechanical-electrochemical tests further verify the multifunctional performance of the structural batteries. Overall, this work opens a pathway to developing safe, low-cost fiber reinforced biomimetic structural electrolytes for structural energy storage devices with excellent mechanical and electrochemical properties.