Rb掺杂Li4Ti5O12作为锂离子电池负极材料的合成及电化学性能  

Synthesis and Electrochemical Performances of Rb-Doped Li4Ti5O12 as Anode Material for Lithium-Ion Batteries

作　　者：SMOLIANOVA Inna 张聪聪 赵欣悦[1,2] 张灵志[1,2] SMOLIANOVA Inna;ZHANG Cong-cong;ZHAO Xin-yue;ZHANG Ling-zhi(Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;CAS Key Laboratory of Renewable Energy,Guangzhou 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院广州能源研究所,广州510640 [2]中国科学院可再生能源重点实验室,广州510640 [3]中国科学院大学,北京100049

出　　处：《新能源进展》2020年第3期192-199,共8页Advances in New and Renewable Energy

基　　金：国家自然科学基金项目(21573239);广州市科技计划项目(201509010018)。

摘　　要：合成了不同Rb掺杂量的钛酸锂(Li4-xRbxTi5O12;x=0.010,0.015,0.020)作为锂离子电池的负极材料。测试结果显示,Rb离子掺杂有效增强了钛酸锂的电子电导率。相同的测试条件下,相比于未掺杂样品和高Rb含量掺杂样品(x=0.015,0.020),适量的Rb掺杂钛酸锂(Li3.99Rb0.01Ti5O12;x=0.010)表现出最优的电化学性能。Li3.99Rb0.01Ti5O12材料表现出161.2 mA∙h/g的初始容量,且在1 C下经过1000次循环后容量保持率可达90.9%。此外,全电池Li3.99Rb0.01Ti5O12//LiFePO4在0.5 C条件下首次放电容量为144 mA∙h/g,经过150次循环后,容量保持率为78.8%。Rb-doped lithium titanates with different doping levels(Li4-xRbxTi5O12;x=0.010,0.015,0.020)as anode materials for lithium-ion batteries were synthesized.Results showed that the electronic conductivity of lithium titanates was enhanced by Rb doping.The low Rb-doping level sample(Li3.99Rb0.01Ti5O12;x=0.010)showed better electrochemical performances than those with higher doping levels(x=0.015,0.020)and neat lithium titanate prepared under the same conditions.Li3.99Rb0.01Ti5O12 with the optimized Rb-doping level delivered an initial capacity of 161.2 mA∙h/g with capacity retention of 90.9%after 1000 cycles at 1 C.The full cell of Li3.99Rb0.01Ti5O12//LiFePO4 delivered a discharge capacity of 144 mA∙h/g,retaining 78.8%of the initial capacity after 150 cycles at 0.5 C.

关 键 词：钛酸锂 Rb掺杂 循环稳定性 阳极材料 锂离子电池 全电池 

分 类 号：TK02[动力工程及工程热物理]