细化颗粒固相法合成锂离子电池正极材料LiNi_(0.80)Co_(0.15)Al_(0.05)O_2及其结构和电化学性能研究  

Solid Synthesis of Li Ni_(0.80)Co_(0.15)Al_(0.05)O_2 Cathode with Fine-Sized Materials and its Structure and Electrochemical Properties

作　　者：夏书标[1,2] 张英杰[1] 董鹏[1] 张雁南[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]曲靖师范学院化学化工学院,云南曲靖655011

出　　处：《高校化学工程学报》2015年第2期425-431,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51164017)

摘　　要：利用超细旋转盘式砂磨机细化颗粒固相烧结法,合成锂离子电池正极材料Li Ni0.80Co0.15Al0.05O2。原料经过砂磨后,混合均匀,粒径达到纳米级。根据塔曼定理,混合均匀的微小粒径可以在相同的烧结温度下,提高烧结的强度。SEM、XRD分别表征NCA材料的颗粒形貌和晶形结构。结果显示,通过细化颗粒烧结后的样品具有良好的形貌和层状结构。CV法测试样品的氧化还原性能,电池测试系统测试样品的电化学性能。测试结果显示,经过细化颗粒,在720℃合成的NCA材料具有良好的层状结构,018/110峰分裂明显。样品的电化学性能优良,0.2C下,首次放电容量达到182 m Ah?g?1,30次循环后容量保持率99.9%。1C下,首次放电容量153 m Ah?g?1,100次循环后容量保持率92.6%。A Li Ni0.80Co0.15Al0.05O2 cathode was synthesized by a solid phase method using a superfine rotating disc sand-mill. Raw materials were mixed and milled into nano-scale. Taman theorem indicates that fine-sized particles can increase sinter strength. The morphology and structure of the prepared material were characterized by SEM and XRD. Results show that the prepared samples have desired morphology and layered structure. A CV method and battery testing system were used to test the oxidation reduction properties and electrochemical performance of the sample, and the results indicate that the NCA cathode materials synthesized at 720 ha℃ ve obvious 018/110 peak splitting. Samples have good electrochemical properties and the initial discharge capacity is 182 mAh·g^1 at 0.2 C with capacity retention of 99.9% after thirty cycles. Moreover, the initial discharge capacity is 153 mAh·g^1 at 1C and the capacity retention of the sample is 92.6% after 100 cycles.

关 键 词：细化颗粒 锂离子电池 正极材料 LI Ni0.80Co0.15Al0.05O2 

分 类 号：TQ173[化学工程—搪瓷工业]