Low-temperature synthesized Li4Mn5O12-like cathode with hybrid cation- and anion-redox capacities

• Main Authors: Liu, Yang (Author), Liu, Guang (Author), Xu, Hui (Author), Zheng, Yuheng (Author), Huang, Yunhui (Author), Li, Sa (Author), Li, Ju (Author)
• Other Authors: Massachusetts Institute of Technology. Department of Materials Science and Engineering (Contributor)
• Format: Article
• Language: English
• Published: Royal Society of Chemistry (RSC), 2020-03-30T19:32:06Z.
• Subjects: Article
• Online Access: Get fulltext

The Li-rich spinel Li4Mn5O12 (Li(Mn5/3Li1/3)O4) historically only shows a reversible cation-redox reaction, with a theoretical capacity of 135.5 mA h g-1. However, we found that a simple 400 °C solid-state synthesis method gives a Li4Mn5O12-like nanoparticulate cathode that yields significant reversible hybrid cation- and anion-redox capacities. A high specific capacity of 212 mA h g-1 was achieved. The reversible anion-redox contribution is attributed to the tiny particle size (<10 nm), which facilitates electron tunneling, and a possible random solid-solution in the Li(Mn5/3Li1/3)O4 lattice due to the low synthesis temperature. ©2019