Low-temperature synthesis of α-MnO2 hollow urchins and their application in rechargeable Li+ batteries
Low-temperature synthesis of α-MnO2 hollow urchins and their application in rechargeable Li+ batteries
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DOI：
10.1021/ic0606274
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发表时间：
2006-08-07
影响因子：
4.6
通讯作者：
Feng, Chuanqi
中科院分区：
文献类型：
--
作者：
Li, Benxia;Rong, Guoxin;Feng, Chuanqi
新型α-MnO 2空心海胆是通过一种简单有效的低温（60 ℃）温和还原路线大规模合成的，系统中没有模板剂或表面活性剂。通过跟踪不同反应阶段产物的结晶和形貌，证实了空心海胆的形成机理是奥斯特瓦尔德熟化过程。所制备的空心海胆样品具有132 m2/g的高Brunauer-Emmett-Teller比表面积和介孔结构，有望有助于改善Li+电池的电化学性能。当α-MnO 2空心海胆用作锂电池的正极材料时，它们的性能优于其他α-MnO 2样品（实心海胆和分散的纳米棒），表明电极材料的电化学性能对其形貌敏感。这种合成方法简单且廉价，因此有利于α-MnO 2空心海胆的大规模生产。
Novel alpha-MnO2 hollow urchins were synthesized on a large scale by a facile and efficient low-temperature (60 degrees C) mild reduction route, without templates or surfactants in the system. The formation mechanism for the hollow urchins was proved to be the Ostwald ripening process by tracking the crystallization and morphology of the product at different reaction stages. The as-prepared hollow-urchin sample has a high Brunauer-Emmett-Teller surface area of 132 m(2)/g and a mesoporous structure, which were expected to help improve the electrochemical property in Li+ batteries. When the alpha-MnO2 hollow urchins were used as the cathode material in Li batteries, they performed better than the other alpha-MnO2 samples (solid urchins and dispersed nanorods), indicating that the electrochemical performance of the electrode material is sensitive to its morphology. This synthetic procedure is straightforward and inexpensive and thus facilitates mass production of alpha-MnO2 hollow urchins.