锂离子电池TiO_(2)-B/Li复合负极的制备及电化学性能研究  

Preparation and Electrochemical Performance of TiO_(2)-B/Li Composite Anode for Li-ion Batteries

作　　者：丁珊修 方苏捷 高洪涛[2] Ding Shanxiu;Fang Sujie;Gao Hongtao(Qingdao Soda Ash Industry Development Co.,Ltd.,Qingdao 266043,China;College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China)

机构地区：[1]青岛碱业发展有限公司,山东青岛266043 [2]青岛科技大学化学与分子工程学院,山东青岛266042

出　　处：《山东化工》2024年第17期42-49,54,共9页Shandong Chemical Industry

基　　金：山东省自然科学基金项目(ZR2021MB049)。

摘　　要：本文探讨了TiO_(2)-B/Li复合负极的合成与电化学性质。锂金属和TiO_(2)-B通过机械搅拌和熔融共混两种方法被制备成不同比例的复合负极。通过对半电池的倍率性能和循环稳定性测试,发现熔融共混法制备的质量比为5∶5的Li/TiO_(2)-B复合负极展现出最优异的电化学性能。该复合负极在电池循环过程中未观察到明显的锂枝晶和“死锂”的形成。在3 mA·cm^(-2)和1.5 mAh·cm^(-2)条件下,由m(TiO_(2)-B)∶m(Li)=5∶5复合负极构成的半电池能够稳定地循环1000圈,且极化电压维持在大约68 mV。此外,还将TiO_(2)-B/Li复合负极与锂离子电池正极材料NCM811和锂硫电池正极材料S@NC配对,构建了全电池,并在1 C和0.5 C的电流密度下进行了循环稳定性测试。TiO_(2)-B/Li-S@NC全电池在0.5 C下循环500圈后,容量保持率为85.37%,容量为640.3 mAh·g^(-1)。同时,TiO_(2)-B/Li-NCM811全电池在1 C下循环500圈后,容量保持率为83.32%。In this study,the synthesis and electrochemical properties of TiO_(2)-B/Li composite anode were investigated.Lithium metal and TiO_(2)-B were prepared into composite anodes with different ratios by both mechanical stirring and melt blending methods.By testing the multiplication performance and cycle stability of the half-cells,we found that the 5∶5 Li/TiO_(2)-B composite anode prepared by the melt blending method exhibited the most excellent electrochemical performance.No obvious lithium dendrites and"dead lithium"formation were observed in this composite anode during the battery cycling.The half-cell composed of m(TiO_(2)-B)∶m(Li)=5∶5 composite anode was able to stably cycle for 1000 cycles at 3 mA·cm^(-2)and 1.5 mAh·cm^(-2),and the polarization voltage was maintained at about 68 mV.In addition,we also paired the TiO_(2)-B/Li composite anode with the lithium-ion battery cathode material,NCM811,and lithium-sulfur battery cathode material,S@NC,and constructed a full-cell,and the full-cell was fabricated at 1.5 mV.The full battery was constructed and tested for cycling stability at current densities of 1 C and 0.5 C.The capacity retention rate was 85.37%and the capacity was 640.3 mAh·g^(-1)after 500 cycles at 1 C.Meanwhile,the capacity retention rate of the full battery of TiO_(2)-B/Li-NCM811 was 83.32%after 500 cycles at 1 C.

关 键 词：TiO_(2)-B/Li复合负极 机械混合法 熔融混合法 长循环性能 容量保持率 

分 类 号：TQ152[化学工程—电化学工业] TM911.3[电气工程—电力电子与电力传动]