A Carbonyl Compound-Based Flexible Cathode with Superior Rate Performance and Cyclic Stability for Flexible Lithium-Ion Batteries
A Carbonyl Compound-Based Flexible Cathode with Superior Rate Performance and Cyclic Stability for Flexible Lithium-Ion Batteries
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DOI：
10.1002/adma.201703868
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发表时间：
2018-01-25
影响因子：
29.4
通讯作者：
Wei, Zhixiang
中科院分区：
文献类型：
--
作者：
Amin, Kamran;Meng, Qinghai;Wei, Zhixiang
合成了一种硫键羰基聚(2，5-二羟基-1，4-苯醌硫化物)化合物(PDHBQS)，并将其用作锂离子电池正极材料。然后利用单壁碳纳米管真空过滤法制备了柔性无粘结剂单壁碳纳米管复合阴极。电化学测试表明，PDHBQS-SWCNTs正极在50 mA g(-1)电流下的放电容量为182 mA h g(-1)(0.9 mA h cm(-2))，在1.5 V-3.5 V的电位窗口下放电容量为75 mA h g(-1)(0.47 mA h cm(-2))，这证实了其在大电流密度下具有良好的倍率性能。PDHBQS-SWCNTs柔性正极在500次充放电循环后，在250 mA g(-1)下仍保持初始容量的%。此外，还组装了基于PDHBQS-SWCNTs正极和锂箔负极的大面积(28 cm(2))柔性电池。柔性电池在连续弯曲条件下表现出良好的电化学活性，经2000次弯曲循环后仍保持88%的初始放电容量。这种材料具有显著的容量、高倍率性能、优越的循环性能和良好的柔韧性，使其成为未来柔性锂离子电池应用的有前途的候选材料。
A sulfur-linked carbonyl-based poly(2,5-dihydroxyl-1,4-benzoquinonyl sulfide) (PDHBQS) compound is synthesized and used as cathode material for lithium-ion batteries (LIBs). Flexible binder-free composite cathode with single-wall carbon nanotubes (PDHBQS-SWCNTs) is then fabricated through vacuum filtration method with SWCNTs. Electrochemical measurements show that PDHBQS-SWCNTs cathode can deliver a discharge capacity of 182 mA h g(-1) (0.9 mA h cm(-2)) at a current rate of 50 mA g(-1) and a potential window of 1.5 V-3.5 V. The cathode delivers a capacity of 75 mA h g(-1) (0.47 mA h cm(-2)) at 5000 mA g(-1), which confirms its good rate performance at high current density. PDHBQS-SWCNTs flexible cathode retains 89% of its initial capacity at 250 mA g(-1) after 500 charge-discharge cycles. Furthermore, large-area (28 cm(2)) flexible batteries based on PDHBQS-SWCNTs cathode and lithium foils anode are also assembled. The flexible battery shows good electrochemical activities with continuous bending, which retains 88% of its initial discharge capacity after 2000 bending cycles. The significant capacity, high rate performance, superior cyclic performance, and good flexibility make this material a promising candidate for a future application of flexible LIBs.