The effects of methylene methanedisulfonate（MMDS） on the high-temperature（0℃） cycle performance of LiMnO/graphite cells are investigated.By addition of 2 wt%MMDS into a routine electrolyte,the high-temperature cy...The effects of methylene methanedisulfonate（MMDS） on the high-temperature（0℃） cycle performance of LiMnO/graphite cells are investigated.By addition of 2 wt%MMDS into a routine electrolyte,the high-temperature cycling performance of LiMn204/graphite cells can be significantly improved.The analysis of differential capacity curves and energy-dispersive X-ray spectrometry（EDX） indicates that MMDS decomposed on both cathode and anode.The three-electrode system of pouch cell is used to reveal the capacity loss mechanism in the cells.It is shown that the capacity fading of cells without MMDS in the electrolytes is due to irreversible lithium consumption during cycling and irreversible damage of LiMnOmaterial,while the capacity fading of cell with 2 wt%MMDS in electrolytes mainly originated from irreversible lithium consumption during cycling.展开更多
In this work the surface of LiNi0.5Mn1.5O4(LMN)particles is modified by Mn3O4 coating through a simple wet grinding method,the electronic conductivity is significantly improved from 1.53×10^-7 S/cm to 3.15×1...In this work the surface of LiNi0.5Mn1.5O4(LMN)particles is modified by Mn3O4 coating through a simple wet grinding method,the electronic conductivity is significantly improved from 1.53×10^-7 S/cm to 3.15×10^-5 S/cm after 2.6 wt%Mn3O4 coating.The electrochemical test results indicate that Mn3O4 coating dramatically enhances both rate performance and cycling capability(at 55℃)of LNM.Among the samples,2.6 wt%Mn3O4-coated LNM not only exhibits excellent rate capability(a large capacity of 108 m Ah/g at 10 C rate)but also shows 78%capacity retention at 55 ℃ and 1 C rate after 100 cycles.展开更多
基金supported by the Key Project of the National Natural Science Foundation of China(Grant No.21233004)
文摘The effects of methylene methanedisulfonate（MMDS） on the high-temperature（0℃） cycle performance of LiMnO/graphite cells are investigated.By addition of 2 wt%MMDS into a routine electrolyte,the high-temperature cycling performance of LiMn204/graphite cells can be significantly improved.The analysis of differential capacity curves and energy-dispersive X-ray spectrometry（EDX） indicates that MMDS decomposed on both cathode and anode.The three-electrode system of pouch cell is used to reveal the capacity loss mechanism in the cells.It is shown that the capacity fading of cells without MMDS in the electrolytes is due to irreversible lithium consumption during cycling and irreversible damage of LiMnOmaterial,while the capacity fading of cell with 2 wt%MMDS in electrolytes mainly originated from irreversible lithium consumption during cycling.
基金the National Key R&D Program of China(No.2018YFB0905400)the Fundamental Research Funds for the Central Universities(No.JZ2019HGBZ0140)+2 种基金the National Natural Science Foundation of China(No.U1630106No.51577175)China Postdoctoral Science Foundation(No.172731)。
文摘In this work the surface of LiNi0.5Mn1.5O4(LMN)particles is modified by Mn3O4 coating through a simple wet grinding method,the electronic conductivity is significantly improved from 1.53×10^-7 S/cm to 3.15×10^-5 S/cm after 2.6 wt%Mn3O4 coating.The electrochemical test results indicate that Mn3O4 coating dramatically enhances both rate performance and cycling capability(at 55℃)of LNM.Among the samples,2.6 wt%Mn3O4-coated LNM not only exhibits excellent rate capability(a large capacity of 108 m Ah/g at 10 C rate)but also shows 78%capacity retention at 55 ℃ and 1 C rate after 100 cycles.
