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Exploration of Spinel LiCrTiO 4 as Cathode Material for Rechargeable Mg‐Li Hybrid Batteries
Author(s) -
Yao Ye,
Zhang Lu,
Bie Xiaofei,
Chen Hong,
Wang Chunzhong,
Du Fei,
Chen Gang
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201702075
Subject(s) - spinel , electrolyte , cathode , electrochemistry , materials science , lithium (medication) , dendrite (mathematics) , salt (chemistry) , ion , chemical engineering , electrode , metal , chemistry , metallurgy , medicine , geometry , mathematics , organic chemistry , engineering , endocrinology
Abstract Mg‐Li hybrid batteries have attracted wide interest in recent years because of their potential safety as well as their cost benefit and high volumetric capacity. However, slow kinetic properties strongly hinder their commercial application. In this study, we have prepared spinel LiCrTiO 4 by a solid‐state reaction and have conducted a comprehensive study aimed at improving the performance of Mg‐Li hybrid batteries by optimizing the dual‐salt electrolyte. LiCrTiO 4 has been found to show reversible discharge/charge capacities of 178 and 169 mA h g −1 in electrolytes of 1 m LiCl and 0.3 m APC (all‐phenyl‐complex), respectively. When the concentration of APC was increased to 0.4 m , LiCrTiO 4 showed a high capacity retention of 95 % after 30 cycles. In addition, no phase transition could be observed for an LiCrTiO 4 electrode in a dual‐salt system, suggesting high electrochemical reversibility. Ex situ EDX and SEM studies have indicated that only Li + ions are inserted into the cathode side, while Mg 2+ ions are reversibly deposited on the surface of Mg metal without dendrite‐like growth, indicative of good safety of the Mg‐Li hybrid batteries.