标题：Porous LiNi0.5Mn1.5O4microspheres with different pore conditions: Preparation and application as cathode materials for lithium-ion batteries
作者：Zhu, Xiaobo ;Li, Xiaona ;Zhu, Youngchun ;Jin, Shasha ;Wang, Yan ;Qian, Yitai
作者机构：[Zhu, Xiaobo ;Li, Xiaona ;Zhu, Youngchun ;Jin, Shasha ;Wang, Yan ;Qian, Yitai ] Hefei National Laboratory for Physical Science at Microscale, Departme 更多
来源：Journal of Power Sources
摘要：Here two types of LiNi0.5Mn1.5O4(LNMO) microspheres with different pore conditions are prepared through a facile two-step method. Initially, nickel manganese carbonate microspheres are obtained through a solvothermal reaction, and then they are heated with different lithium sources to obtain the two products. Scanning electron microscopy images clearly disclose that the two types of microspheres are respectively covered with dense tinier pores and sparse larger pores while both of their interiors are constituted by nanoparticles in similar size. Nitrogen adsorption/desorption analyses indicate that their maximum pore diameters are 2.2 nm and 3.5 nm. As cathodes of lithium ion batteries, the LNMO microspheres equipped with larger pores exhibit much more excellent electrochemical performance especially in terms of rate performance, achieving a discharge capacity of 101.7 mAh g-1even at 50C, while their counterparts only receive 14.3 mAh g-1coupled with severe polarization. And the capacities of them respectively maintain at 102.9 and 67 mAh g-1after 100 cycles at 20C. Their distinct performance is suggested due to both the pore parameter and its related surface area. © 2014 Elsevier B.V. All rights reserved.