标题：Hydrazine-hydrothermal synthesis of pure-phase O-LiMnO2 for lithium-ion battery application
作者：Zhao, C.;Kang, W.;Zhao, S.;Shen, Q.
作者机构：[Zhao, C] Key Laboratory for Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, 更多
通讯作者地址：[Zhao, CH]Shandong Univ, Sch Chem & Chem Engn, Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.
来源：Micro & nano letters
摘要：Submicron-sized orthorhombic LiMnO2 (O-LiMnO2) crystals with clear edges can be successfully prepared by a hydrothermal route using LiOH and porous Mn2O3 as precursors at 180°C for 16 h. As a reducing agent, hydrazine hydrate (N2H4.H2O) was introduced into the hydrothermal reaction systems of dark-green O-LiMnO2 at a N2H4.H2O:Mn2O3 molar ratio of 10.6:100, inhibiting the common impurity formation of red Li2MnO3 therein. At room temperature, the relatively purified O-LiMnO2 gives a high reversible capacity and good cyclability, showing a maximum discharge capacity of 216 mAh g-1 and a retention value of 200 mAh g-1 over 30 cycles at 0.1 C between 2.0 and 4.3 V, whereas the unpurified O-LiMnO2 showed a maximum discharge capacity of 200 mAh g-1, and fast decayed to 165 mAh g-1 during the 30th cycle. Moreover, cyclic voltammetry measurements and X-ray diffraction patterns of the cycled electrode materials prove the irreversible phase transformation of O-LiMnO2 to spinel LiMn24 upon cycling, suggesting that the easily Mn(IV)-doped synthesis of O-LiMnO2 hinder its potential application as lithium-ion battery cathodes.