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In Situ Studies of Li/Cu‐Doped Layered P2 NaxMnO2 Electrodes for Sodium‐Ion Batteries
Small Methods ( IF 10.7 ) Pub Date : 2018-06-12 , DOI: 10.1002/smtd.201800092 Divya Sehrawat 1 , Jiaolong Zhang 2 , Denis Y. W. Yu 2 , Neeraj Sharma 1
Small Methods ( IF 10.7 ) Pub Date : 2018-06-12 , DOI: 10.1002/smtd.201800092 Divya Sehrawat 1 , Jiaolong Zhang 2 , Denis Y. W. Yu 2 , Neeraj Sharma 1
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By understanding how structural transitions affect the electrochemical performance of a battery, better electrode materials for reversible Na+ insertion/extraction can be developed. Here, the structural evolution of the recently synthesized P2 phases of Na0.7Li0.1Mn0.9O2 and Na2/3Cu1/3Mn2/3O2 using high‐resolution in situ synchrotron X‐ray diffraction experiments is reported and the evolution relative to the parent P2 Na0.7MnO2 is directly compared. All electrodes feature solid solution and two‐phase reactions during charge/discharge/charge processes. Using a simplified single‐phase evolution for comparative purposes, the P2 Na0.7Li0.1Mn0.9O2 and P2 Na2/3Cu1/3Mn2/3O2 show volume changes of 1.909(1) and 1.13(3) Å3 of the major phase, respectively, during charge/discharge while the parent P2 Na0.7MnO2 shows an overall volume change of 0.67(0) Å3 for P2 and 61.9(1) Å3 for orthorhombic phase. The maximum volume for P2 Na0.7Li0.1Mn0.9O2 of 81.094(6) Å3 is observed at 2.35 V during discharge while for P2 Na2/3Cu1/3Mn2/3O2 of 81.753(6) Å3 is observed at the discharged state (1.5 V). Compared to the P2 Na0.7MnO2 the number of phase transitions experienced by the P2 Na0.7Li0.1Mn0.9O2 and P2 Na2/3Cu1/3Mn2/3O2 are significantly smaller. Li/Cu‐doped samples generally show better cycle performance, and these results illustrate the structural response such substitutions have on the Na+ insertion/extraction of P2 Na0.7MnO2 during cycling.
中文翻译：
用于钠离子电池的锂/铜掺杂层状P2 NaxMnO2电极的原位研究
通过了解结构转变如何影响电池的电化学性能，可以开发出用于可逆Na +插入/提取的更好的电极材料。在这里，使用高分辨率原位同步加速器X射线衍射实验报道了最近合成的Na 0.7 Li 0.1 Mn 0.9 O 2和Na 2/3 Cu 1/3 Mn 2/3 O 2的P2相的结构演化，并且相对于母体P2 Na 0.7 MnO 2的演化直接比较。在充电/放电/充电过程中，所有电极均具有固溶体和两相反应。为了进行比较，使用简化的单相演化，P2 Na 0.7 Li 0.1 Mn 0.9 O 2和P2 Na 2/3 Cu 1/3 Mn 2/3 O 2的体积变化为1.909（1）和1.13（3）埃3主相的，分别，在充电期间/放电而父P2的Na 0.7的MnO 2所示的0.67（0）的总体积的变化的3对P2和61.9（1）埃3为斜方晶相。P2 Na的最大体积0.7栗0.1锰0.9 ø 2的81.094（6）3被在放电期间在2.35V时观察到，而对于P2的Na 2/3的Cu 1/3的Mn 2/3 ø 2的81.753（6）3设置在放电观察状态（1.5 V）。与P2 Na 0.7 MnO 2相比，P2 Na 0.7 Li 0.1 Mn 0.9 O 2和P2 Na 2/3 Cu 1/3 Mn 2/3 O 2经历的相变数都小得多。Li / Cu掺杂的样品通常显示出更好的循环性能，这些结果说明了这种取代对循环过程中P2 Na 0.7 MnO 2的Na +插入/萃取的结构响应。
更新日期：2018-06-12
中文翻译：
用于钠离子电池的锂/铜掺杂层状P2 NaxMnO2电极的原位研究
通过了解结构转变如何影响电池的电化学性能，可以开发出用于可逆Na +插入/提取的更好的电极材料。在这里，使用高分辨率原位同步加速器X射线衍射实验报道了最近合成的Na 0.7 Li 0.1 Mn 0.9 O 2和Na 2/3 Cu 1/3 Mn 2/3 O 2的P2相的结构演化，并且相对于母体P2 Na 0.7 MnO 2的演化直接比较。在充电/放电/充电过程中，所有电极均具有固溶体和两相反应。为了进行比较，使用简化的单相演化，P2 Na 0.7 Li 0.1 Mn 0.9 O 2和P2 Na 2/3 Cu 1/3 Mn 2/3 O 2的体积变化为1.909（1）和1.13（3）埃3主相的，分别，在充电期间/放电而父P2的Na 0.7的MnO 2所示的0.67（0）的总体积的变化的3对P2和61.9（1）埃3为斜方晶相。P2 Na的最大体积0.7栗0.1锰0.9 ø 2的81.094（6）3被在放电期间在2.35V时观察到，而对于P2的Na 2/3的Cu 1/3的Mn 2/3 ø 2的81.753（6）3设置在放电观察状态（1.5 V）。与P2 Na 0.7 MnO 2相比，P2 Na 0.7 Li 0.1 Mn 0.9 O 2和P2 Na 2/3 Cu 1/3 Mn 2/3 O 2经历的相变数都小得多。Li / Cu掺杂的样品通常显示出更好的循环性能，这些结果说明了这种取代对循环过程中P2 Na 0.7 MnO 2的Na +插入/萃取的结构响应。
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