Distinctive electrochemical performance of novel Fe-based Li-rich cathode material prepared by molten salt method for lithium-ion batteries

作者：Zhao, Taolin^*; Ji, Rixin; Yang, Hedi; Zhang, Yuxia; Sun, Xiuguo; Li, Yanting; Li, Li; Chen, Renjie^*

来源：Journal of Energy Chemistry, 2019, 33(06): 37-45.

DOI：10.1016/j.jechem.2018.08.005

• Lithium-ion batteries
• Fe-based material
• Li-rich cathode
• Molten salt
• High capacity

For constructing next-generation lithium-ion batteries with advanced performances, pursuit of high-capacity Li-rich cathodes has caused considerable attention. So far, the low discharge specific capacity and serious capacity fading are strangling the development of Fe-based Li-rich materials. To activate the extra-capacity of Fe-based Li-rich cathode materials, a facile molten salt method is exploited using an alkaline mixture of LiOH-LiNO3-Li2O2 in this work. The prepared Li-1.09(Fe0.2Ni0.3Mn0.5)(0.91)O-2 material yields high discharge specific capacity and good cycling stability. The discharge specific capacity shows an upward tendency at 0.1 C. After 60 cycles, a high reversible specific capacity of similar to 250 mAh g(-1) is delivered. The redox of Fe3+/Fe4+ and Mn3+/Mn4+ are gradually activated during cycling. Notably, the redox reaction of Fe2+/Fe3+ can be observed reversibly below 2V, which is quite different from the material prepared by a traditional co-precipitation method. The stable morphology of fine nanoparticles (100-300 nm) is considered benefiting for the distinctive electrochemical performances of Li-1.09(Fe0.2Ni0.3Mn0.5)(0.91)O-2. This study demonstrates that molten salt method is an inexpensive and effective approach to activate the extra capacity of Fe-based Li-rich cathode material for high-performance lithium-ion batteries.

• 出版日期2019-6
• 单位石家庄铁道大学; 北京理工大学