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Stable Voltage Cutoff Cycle Cathode with Tunable and Ordered Porous Structure for Li‐O2 Batteries
Small ( IF 13.0 ) Pub Date : 2018-10-15 , DOI: 10.1002/smll.201803607 Mingbo Zheng 1, 2 , Jie Jiang 1 , Zixia Lin 1, 2 , Ping He 1 , Yi Shi 1 , Haoshen Zhou 1
Small ( IF 13.0 ) Pub Date : 2018-10-15 , DOI: 10.1002/smll.201803607 Mingbo Zheng 1, 2 , Jie Jiang 1 , Zixia Lin 1, 2 , Ping He 1 , Yi Shi 1 , Haoshen Zhou 1
Affiliation
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Ordered porous RuO2 materials with various pore structure parameters are prepared via a hard‐template method and are used as the carbon‐free cathodes for Li‐O2 batteries under the voltage cutoff cycle mode. The influences of pore structure parameters of porous RuO2 on electrochemical performance are systematically studied. Results indicate that specific surface area and pore size determine the specific capacity and round‐trip efficiency of Li‐O2 batteries. Too small pores cause pore blockage and hinder the diffusion pathways of Li+ and O2, thereby causing small specific capacity and high overpotentials. Too large pores weaken the mechanical property of porous RuO2, thereby causing the rapid decrease in capacity during electrochemical reaction. The Li‐O2 battery based on the RuO2 cathode with an average pore size of 16 nm (RuO2‐16) exhibits a high round‐trip efficiency of ≈75.6% and an excellent cycling stability of up to 70 cycles at 100 mA g−1 with a voltage window of 2.5–4.0 V. The superior performance of RuO2‐16 can be attributed to its optimal pore structure parameters. Furthermore, the in situ differential electrochemical mass spectrometry test demonstrates that RuO2 can effectively reduce parasitic reactions compared with carbon materials.
中文翻译：
具有可调节和有序多孔结构的Li-O2电池的稳定电压截止周期阴极
通过硬模板方法制备了具有各种孔结构参数的有序多孔RuO 2材料，并在电压截止循环模式下用作Li-O 2电池的无碳阴极。系统研究了多孔RuO 2的孔结构参数对电化学性能的影响。结果表明，比表面积和孔径决定了Li-O 2电池的比容量和往返效率。孔太小会导致孔堵塞，并阻碍Li +和O 2的扩散途径，从而导致较小的比容量和较高的超电势。孔太大会削弱多孔RuO 2的机械性能从而引起电化学反应过程中容量的迅速降低。基于RuO 2阴极，平均孔径为16 nm（RuO 2 -16）的Li-O 2电池，具有约75.6％的高往返效率，在100 mA电流下具有出色的循环稳定性，可达70个循环克-1与2.5-4.0 V.的RuO的优异性能的电压窗口2 -16可以归因于它的最佳孔结构参数。此外，原位差分电化学质谱测试表明，与碳材料相比，RuO 2可以有效地减少寄生反应。
更新日期：2018-10-15
中文翻译：
具有可调节和有序多孔结构的Li-O2电池的稳定电压截止周期阴极
通过硬模板方法制备了具有各种孔结构参数的有序多孔RuO 2材料，并在电压截止循环模式下用作Li-O 2电池的无碳阴极。系统研究了多孔RuO 2的孔结构参数对电化学性能的影响。结果表明，比表面积和孔径决定了Li-O 2电池的比容量和往返效率。孔太小会导致孔堵塞，并阻碍Li +和O 2的扩散途径，从而导致较小的比容量和较高的超电势。孔太大会削弱多孔RuO 2的机械性能从而引起电化学反应过程中容量的迅速降低。基于RuO 2阴极，平均孔径为16 nm（RuO 2 -16）的Li-O 2电池，具有约75.6％的高往返效率，在100 mA电流下具有出色的循环稳定性，可达70个循环克-1与2.5-4.0 V.的RuO的优异性能的电压窗口2 -16可以归因于它的最佳孔结构参数。此外，原位差分电化学质谱测试表明，与碳材料相比，RuO 2可以有效地减少寄生反应。
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