High-rate Li4Ti5O12/porous activated graphene nanoplatelets composites using LiOH both as lithium source and activating agent. (1st February 2018)

• Record Type: Journal Article
• Authors: Wang, Dongdong; Shan, Zhongqiang; Liu, Xiaoyan; Na, Ren; Wang, Juan; Liu, Huitian; Tian, Jianhua
• Is Part Of: Electrochimica acta. Volume 262(2018)
• Page Start: 9
• Page End: 17
• Publication Date: 2018-02-01
• Subjects: Low-cost and green -- Hydrothermal activation -- LiOH solution -- Li4Ti5O12 nanoparticles -- Lithium-ion batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.12.185
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The Li4 Ti5 O12 /activated graphene nanoplatelets (Li4 Ti5 O12 /a-GNPs) composites are prepared via a low-cost, green, one-pot hydrothermal process by using LiOH both as lithium source and activating agent for the first time. The LiOH solution concentration and hydrothermal time are optimized to obtain the pure Li4 Ti5 O12 /a-GNPs. The synergistic effects of the nanosized Li4 Ti5 O12 and the three-dimensional porous a-GNPs endow the composites with convenient lithium ion diffusion channels and efficiently conductive structures for electron and ion transport. As anticipated, the Li4 Ti5 O12 /a-GNPs deliver an outstanding rate capability of 125 and 113 mA h g −1 at 80 and 100 C, respectively, and an excellent cycling stability with 90.21% capacity retention after 2000 cycles at 10 C. These results are much better than those of the Li4 Ti5 O12 /GNPs and pure Li4 Ti5 O12, demonstrating Li4 Ti5 O12 /a-GNPs are promising anode materials for lithium-ion batteries of high current density applications.