Li_4Mn_5O_(12)型尖晶石的合成与电化学性能研究  

Study on Synthesis and Electrochemical Performance of Li_4Mn_5O_(12)-type Spinel

作　　者：童庆松[1] 林素英[1] 连锦明[1] 

机构地区：[1]福建师范大学化学与材料学院,福建福州350007

出　　处：《福建师范大学学报（自然科学版）》2006年第1期60-63,共4页Journal of Fujian Normal University：Natural Science Edition

基　　金：教育部重点基金资助项目(03065);福建省教育厅重点基金资助项目(JA02159);福建自然科学基金资助项目(E0510014);福建省科技厅基金资助项目(2005K012)

摘　　要：以L iOH.H2O和M n(CH3COO)2.2H2O为原料,用微波烧结和固相烧结相结合的方法合成了L i4M n5O12型尖晶石正极材料.XRD分析、非原位XRD分析、差示量热分析(DTA)和充放电循环实验表明,用300 W微波烧结30 m in,在380℃下后处理48 h可获得具有纯L i4M n5O12物相的样品.该样品的初始放电容量达到176 mA h.g-1,40循环的放电容量为123 mA h.-g 1.5个充放电循环后,样品的循环稳定性得到明显的提高.在放电过程中样品的尖晶石结构具有较好的稳定性.The positive material Li4Mn5O12 can be prepared by using LiOH · H2O and Mn （CH3COO）2 · 2H2O as the starting materials and by combined methods consisted of microwave sintering process and solid-state-sintering one. XRD, Ex-situ XRD, DTA and charge-discharge cycle were employed to study the electrochemical performance of as-prepared samples. It can be found that the sample with pure Li4Mn5O12 phase, which prepared by sintered in the microwave with a power of 300W for 30 min and solid-state sintered for 48 h at 380℃, exhibited a capacity of 176 mAh · g^-1 at the 1st cycle and a capacity of 123 mAh · g^-1 at the 40 th cycle, which structure kept stable in the discharge process. After 5 charge discharge cycles, the cycle stability of the sample was obviously improved.

关 键 词：锂锰氧化物 微波烧结 可充性 

分 类 号：O646[理学—物理化学]