Flexible, High-Wettability and Fire-Resistant Separators Based on Hydroxyapatite Nanowires for Advanced Lithium-Ion Batteries
Flexible, High-Wettability and Fire-Resistant Separators Based on Hydroxyapatite Nanowires for Advanced Lithium-Ion Batteries
复制标题
用于先进锂离子电池的基于羟基磷灰石纳米线的柔性、高润湿性和阻燃隔膜
DOI：
10.1002/adma.201703548
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发表时间：
2017-11-27
影响因子：
29.4
通讯作者：
Hu, Xianluo
中科院分区：
文献类型：
--
作者：
Li, Heng;Wu, Dabei;Hu, Xianluo
隔膜对锂离子电池的电化学性能和安全性起着至关重要的作用。商用微孔聚烯烃隔膜往往存在电解液润湿性差、热稳定性差、安全隐患严重等问题。本文报道了一种基于羟基磷灰石纳米线(HAP-NWS)的新型高柔韧性多孔隔膜，它具有良好的热稳定性、耐火性和优异的电解液润湿性。HAP-NWS与纤维素纤维(CFs)通过杂化形成层次化的交联网络结构，使分离器具有较高的柔韧性和较强的机械强度。HAP NW网络的高热稳定性使隔膜在高达700摄氏度的温度下仍能保持其结构完整性，而HAP NW的耐火性能确保了电池的高安全性。特别是，由于其独特的组成和高度多孔的结构，所制备的HAP/CF隔膜与液体电解质的接触角接近于零，电解液吸收率高达253%，表明与商业聚烯烃隔膜相比，HAP/CF隔膜具有更好的电解质润湿性。所制备的HAP/CF隔膜具有优异的电解液润湿性、机械稳定性、热稳定性和耐火性等独特优点，有望成为一种性能更好、安全性更高的新型隔膜材料。
Separators play a pivotal role in the electrochemical performance and safety of lithium-ion batteries (LIBs). The commercial microporous polyolefin-based separators often suffer from inferior electrolyte wettability, low thermal stability, and severe safety concerns. Herein, a novel kind of highly flexible and porous separator based on hydroxyapatite nanowires (HAP NWs) with excellent thermal stability, fire resistance, and superior electrolyte wettability is reported. A hierarchical cross-linked network structure forms between HAP NWs and cellulose fibers (CFs) via hybridization, which endows the separator with high flexibility and robust mechanical strength. The high thermal stability of HAP NW networks enables the separator to preserve its structural integrity at temperatures as high as 700 degrees C, and the fire-resistant property of HAP NWs ensures high safety of the battery. In particular, benefiting from its unique composition and highly porous structure, the as-prepared HAP/CF separator exhibits near zero contact angle with the liquid electrolyte and high electrolyte uptake of 253%, indicating superior electrolyte wettability compared with the commercial polyolefin separator. The as-prepared HAP/CF separator has unique advantages of superior electrolyte wettability, mechanical robustness, high thermal stability, and fire resistance, thus, is promising as a new kind of separator for advanced LIBs with enhanced performance and high safety.