Direct Ink Writing of Polymer Composite Electrolytes with Enhanced Thermal Conductivities
Direct Ink Writing of Polymer Composite Electrolytes with Enhanced Thermal Conductivities
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DOI：
10.1002/adfm.202006683
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发表时间：
2020-10-16
影响因子：
19
通讯作者：
Shahbazian-Yassar, Reza
中科院分区：
文献类型：
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作者：
Cheng, Meng;Ramasubramanian, Ajaykrishna;Shahbazian-Yassar, Reza
导热纳米材料在聚合物电池中的适当分布为减轻与电池中的局部热点和安全问题相关的性能下降提供了新的机会。本文中，利用直接油墨写入（DIW）方法来制造嵌入有硅烷处理的六方氮化硼（S-hBN）片晶且不含任何挥发性有机溶剂的聚环氧乙烷（PEO）复合聚合物电解质（CPE）。观察到在DIW过程期间，S-hBN片晶在印刷的CPE中很好地排列。具有取向的S-hBN片晶的印刷CPE的面内热导率为1.031 W-1 K-1，其为具有随机分散的S-hBN片晶的原始CPE（0.612 W-1 K-1）的约1.7倍。热成像显示，印刷的电解质的峰值温度（摄氏度）比不含S-hBN的CPE的峰值温度低24.2%，并且比具有随机分散的S-hBN的CPE的峰值温度低10.6%，表明上级热传输性质。用印刷CPE和LiFePO（4）阴极制成的锂离子半电池在室温下表现出146.0mAh g（-1）的高放电比容量和91%的稳定库仑效率，100次循环。这项工作有助于开发可印刷的导热聚合物，以实现更安全的电池操作。
Proper distribution of thermally conductive nanomaterials in polymer batteries offers new opportunities to mitigate performance degradations associated with local hot spots and safety concerns in batteries. Herein, a direct ink writing (DIW) method is utilized to fabricate polyethylene oxide (PEO) composite polymers electrolytes (CPE) embedded with silane-treated hexagonal boron nitride (S-hBN) platelets and free of any volatile organic solvents. It is observed that the S-hBN platelets are well aligned in the printed CPE during the DIW process. The in-plane thermal conductivity of the printed CPE with the aligned S-hBN platelets is 1.031 W-1K-1, which is about 1.7 times that of the pristine CPE with the randomly dispersed S-hBN platelets (0.612 W-1K-1). Thermal imaging shows that the peak temperature (degrees C) of the printed electrolytes is 24.2% lower than that of the CPE without S-hBN, and 10.6% lower than that of the CPE with the randomly dispersed S-hBN, indicating a superior thermal transport property. Lithium-ion half-cells made with the printed CPE and LiFePO(4)cathode displayed high specific discharge capacity of 146.0 mAh g(-1)and stable Coulombic efficiency of 91% for 100 cycles at room temperature. This work facilitates the development of printable thermally-conductive polymers for safer battery operations.