Vacuum induced self-assembling nanoporous LiMn2O4 for lithium ion batteries with superior high rate capability. (20th December 2015)

• Record Type: Journal Article
• Authors: Hua, Wei-Bo; Wang, Su-Ning; Guo, Xiao-Dong; Chou, Shu-Lei; Yin, Kui; Zhong, Ben-He; Dou, Shi-Xue
• Is Part Of: Electrochimica acta. Volume 186(2015)
• Page Start: 253
• Page End: 261
• Publication Date: 2015-12-20
• Subjects: lithium ion batteries -- cathode material -- nanoporous -- vacuum induced self-assembly -- rate capability; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2015.10.093
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: A nanoporous spinel LiMn2 O4 cathode material with excellent electrochemical property has been successfully prepared via a simple, low-cost and scalable vacuum induced self-assembling process. Highlights: Nanoporous LiMn2 O4 is prepared by vacuum induced self-assembly reaction. Ammonia molecules play a key role in the formation of the crystals. Nanoporous structure of LMO-A improves its electrochemical properties. Abstract: Spinel LiMn2 O4 is an inexpensive, eco-friendly and highly abundant cathode material for lithium ion batteries. Here, we report a synthesis of nanoporous LiMn2 O4 cathode material using a simple vacuum induced self-assembly reaction. Ammonia molecules play a key role in the formation of the nanoporous structure in our method. The galvanostatic charge/discharge results show that the nanoporous LiMn2 O4 delivers a high specific capacity at high power rates. About 95.9% of its initial capacity (94.5 mAh g −1 ) is retained after 100 cycles at 10 C. The enhanced kinetics of nanoporous LiMn2 O4 with low apparent activation energies indicates that the nanoporous structure provides short Li-ion diffusion paths and a continuous three-dimensional network of pathways for the transport of Li-ions and electrons. These results reveal that the nanoporous spinel LiMn2 O4 material is a promising cathode candidate for next generation of high-power lithium ion battery.