α-MnO2 nanowire catalysts with ultra-high capacity and extremely low overpotential in lithium-air batteries through tailored surface arrangement
α-MnO2 nanowire catalysts with ultra-high capacity and extremely low overpotential in lithium-air batteries through tailored surface arrangement
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DOI：
10.1039/c3cp53754d
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发表时间：
2013-01-01
影响因子：
3.3
通讯作者：
Kang, Yong-Mook
中科院分区：
文献类型：
--
作者：
Song, Kyeongse;Jung, Jaepyeong;Kang, Yong-Mook
我们报道了使用α-MnO2 NW催化剂的锂空气电池的极高容量(11000 mA h g(-1))、极高的倍率能力(4500 mA h g(-1)在5000 mA g(-1)下)和高可逆性，这主要与它们在NW表面暴露出较多的Mn3+和独特的放电产物沉积机制有关。我们的研究发现，由于α-MnO2纳米粒子表面排列的改变，锂离子的传输速度空前快，放电产物的形成-分解可逆，这表明了一种结合纳米结构定制实现高功率锂空气电池的策略。
We here report on very high capacity (11 000 mA h g(-1)), superb rate capability (4500 mA h g(-1) at 5000 mA g(-1)) and high reversibility of Li-air batteries using alpha-MnO2 NW catalysts mainly associated with their relatively large amount of Mn3+ exposed on the NW surface and a unique mechanism for deposition of discharge products. Our findings of the unprecedentedly fast Li ion transport and reversible formation-decomposition of discharge products attributed to the modified surface arrangement of alpha-MnO2 NWs suggest a strategy for achieving high-power Li-air batteries in combination with nano-architecture tailoring.