锂-空气电池的高性能空气电极的性能研究

摘要

锂-空气电池是比能量最高的二次电池，已成为当今化学电源领域的研究热点。在锂-空气电池的各个组件中，空气电极的设计和制备是进一步提高锂-空气电池性能的关键。以简单的合成方法制备了一种具有高催化活性的镍酸镧（LaNiO₃）催化剂，利用Super P作为催化剂载体制备了一种新型空气电极。实验结果表明，含有LaNiO₃催化剂的锂-空气电池具有良好的充放电性能，放电电压平台为2.59 V，放电容量达到1 109 mAh·g^-1。比较了2种碳材料（Super P和GNS）作为催化剂载体的空气电极对电池充放电性能的影响，发现多孔性的空气电极结构更有利于电池性能的提高。此外，还分析了控制电解液（1 mol·L^-1 LiTFSI/TEGDME）中水含量的必要性。由Super P、LaNiO₃及水含量小于1×10^-5的电解液（1 mol·L^-1 LiTFSI/TEGDME）组装成的锂-空气电池具有良好的循环性能，循环第五圈的容量保持率为96.21%，且不出现电压平台的明显变化。

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	徐迁
	徐强
	桑林
	丁飞
	刘兴江

关键词：锂-空气电池空气电极碳载体催化剂

Abstract：

Lithium-air batteries with the highest specific energy has become a hot research topic in the field of chemical power source. Among the components of lithium-air batteries, design and preparation of air electrode is a key factor for improving the performance of lithium-air batteries. A new catalyst of LaNiO₃ with high catalytic activity is prepared by a simple synthetic method. The experimental results show that the lithium-air battery with LaNiO₃ catalyst has a good charge-discharge performance, which discharge capacity is 1 109 mAh·g^-1 and discharge voltage platform is 2.59 V. The impact of two kinds of carbon materials (Super P and GNS) as the catalyst carrier on the charge-discharge performance of lithium air battery is studied in detail. It can be found that the porous structure of electrode is more advantageous to the improvement of performance of lithium-air battery. Furthermore, the necessity of controlling water content in the electrolyte(1 mol·L^-1 LiTFSI/TEGDME)is also discussed. A good cyclic performance of lithium air batteries with LaNiO₃/Super P air electrode can be obtained in an electrolyte (water content < 1×10^-5). The capacity retention of lithium air batteries after the fifth cycle is 96.21%. There is no obvious change for the voltage platform.

Keywords： lithium-air battery； air electrode； carbon carrier； catalyst

Received 2015-04-14;

Corresponding Authors: 徐强,E-mail:xuqiang@tju.edu.cn。 Email: xuqiang@tju.edu.cn

About author: 徐迁(1990-),男,硕士,主要研究方向为先进化学电源。

引用本文:

徐迁, 徐强, 桑林, 丁飞, 刘兴江.锂-空气电池的高性能空气电极的性能研究[J]. 化学工业与工程, 2017,34(4): 44-49

Xu Qian, Xu Qiang, Sang Lin, Ding Fei, Liu Xingjiang.High-Performance Air Electrode for Li-Air Batteries[J]. Chemcial Industry and Engineering, 2017,34(4): 44-49

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