Single-crystalline LiMn₂O₄ nanorods as cathode material with enhanced performance for Li-ion battery synthesized via template-engaged reaction

详细信息    查看全文

• 作者：Dan Zhan ; Qinggang Zhang ; Xiaohong Hu ; ^{xhhu88@126.com} ; Guozhu Zhu ; Tianyou Peng ; ^{typeng@whu.edu.cn}
• 关键词：LiMn2O4 ; Single-crystalline nanorod ; Transformation ; Electrochemical property
• 刊名：Solid State Ionics
• 出版年：2013
• 出版时间：15 May, 2013
• 年：2013
• 卷：239
• 期：Complete
• 页码：8-14
• 全文大小：1305 K

文摘

Single-crystalline LiMn₂O₄ nanorods with a diameter of ~ 100 nm were synthesized via a template-engaged reaction by using tetragonal ¦Â-MnO₂ nanorods as starting material. The investigations on the structures and morphologies of both the precursor and the final product reveal that a minimal structure reconstruction can be responsible for the chemical transformation from tetragonal ¦Â-MnO₂ nanorods to cubic LiMn₂O₄ nanorods. The obtained LiMn₂O₄ nanorods as cathode material for Li-ion battery exhibit superior high-rate capability and good cycling stability in a potential range of 3.5-4.3 V vs. Li⁺/Li, which can deliver an initial discharge capacity of 125 mAh g^? 1 (> 84 % of the theoretical capacity of LiMn₂O₄) at a current rate of 0.5 C, and about 75 % of its initial capacity can be remained after 500 charge-discharge cycles at a current rate of 3 C. Importantly, the rod-like nanostructure and single-crystalline nature are also well preserved after prolonging the charge/discharge cycling time at a relatively high current rate, indicating good structural stability of the single-crystalline nanorods during the lithium intercalation/deintercalation processes, and such high-rate capacity and cycling performance can be ascribed to the favorable morphology and the high crystallinity of the obtained LiMn₂O₄ nanorods.