Layered perovskite LiEuTiO4 as a 0.8 V lithium intercalation electrode

作者：Huang, Jun; Yang, Kaihua; Zhang, Zhengxi^*; Yang, Li^*; Hirano, Shin-ichi

来源：Chemical communications, 2017, 53(55): 7800-7803.

DOI：10.1039/c7cc03933f

• LONG CYCLE LIFE
• ION BATTERIES
• STORAGE
• CAPACITY
• ORIGIN
• OXIDES
• LN
• MAGNETORESISTANCE
• CHALLENGES
• SPECTRA

similar to 1 V lithium intercalation materials are promising anodes for lithium-ion batteries, because such materials give consideration to both the tolerance of lithium plating (e.g., graphite with similar to 0.1 V versus Li+/Li easily results in lithium plating due to a too low potential) and the energy density of the batteries (e.g., Li4Ti5O12 with similar to 1.55 V decreases the battery voltage, and thus reduces the energy density). Herein, the layered perovskite compound LiEuTiO4 with a 0.8 V lithium intercalation/deintercalation potential plateau was successfully synthesized by the ion-exchange reaction with NaEuTiO4 prepared via a sol-gel method. LiEuTiO4 can deliver a high capacity of 219.2 mA h g (1) (2nd discharge) at a rate of 100 mA g (1). Even after 500 cycles, the discharge capacity remains at similar to 217 mA h g(-1) and the Coulombic efficiency is 99.2%. To our knowledge, the cycle stability of LiEuTiO4 exceeds all previous similar to 1 V electrodes. Different from the common lithium intercalation Ti-based electrodes (such as Li4Ti5O12) based on the reduction of the Ti4+ to Ti3+, electrochemical lithium intercalation into LiEuTiO4 leads to the reduction of the Eu3+ to Eu2+.

• 出版日期2017-7-14
• 单位上海交通大学