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High-Performance P2-Phase Na2/3Mn0.8Fe0.1Ti0.1O2 Cathode Material for Ambient-Temperature Sodium-Ion Batteries
Chemistry of Materials ( IF 7.2 ) Pub Date : 2015-12-28 00:00:00 , DOI: 10.1021/acs.chemmater.5b03276
Man Huon Han 1 , Elena Gonzalo 1 , Neeraj Sharma 2 , Juan Miguel López del Amo 1 , Michel Armand 1 , Maxim Avdeev 3 , Jose Javier Saiz Garitaonandia 4 , Teófilo Rojo 1, 4
Chemistry of Materials ( IF 7.2 ) Pub Date : 2015-12-28 00:00:00 , DOI: 10.1021/acs.chemmater.5b03276
Man Huon Han 1 , Elena Gonzalo 1 , Neeraj Sharma 2 , Juan Miguel López del Amo 1 , Michel Armand 1 , Maxim Avdeev 3 , Jose Javier Saiz Garitaonandia 4 , Teófilo Rojo 1, 4
Affiliation
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High-performance Mn-rich P2-phase Na2/3Mn0.8Fe0.1Ti0.1O2 is synthesized by a ceramic method, and its stable electrochemical performance is demonstrated. 23Na solid-state NMR confirms the substitution of Ti4+ ions in the transition metal oxide layer and very fast Na+ mobility in the interlayer space. The pristine electrode delivers a second charge/discharge capacity of 146.57/144.16 mA·h·g–1 and retains 95.09% of discharge capacity at the 50th cycle within the voltage range 4.0–2.0 V at C/10. At 1C, the reversible specific capacity still reaches 99.40 mA·h·g–1, and capacity retention of 87.70% is achieved from second to 300th cycle. In addition, the moisture-exposed electrode reaches reversible capacities of more than 130 and 80 mA·h·g–1 for C/10 and 1C, respectively, with excellent capacity retention. The correlation between overall electrochemical performance of both electrodes and crystal structural characteristics are investigated by neutron powder diffraction. The stability of pristine electrode’s crystallographic structure during the charge/discharge process has been investigated by in situ X-ray diffraction, where only a solid solution reaction occurs within the given voltage range except for a small biphasic mechanism occurring at or below 2.2 V during the discharge process. The relatively small substitution (20%) at the transition metal site leads to stable electrochemical performance, which is in part derived from the structural stability during electrochemical cycling. Therefore, the small cosubstitution (e.g., with Ti and Fe) route suggests a possible new scope for the design of sodium-ion battery electrodes that are suitable for long-term cycling.
中文翻译：
适用于环境温度钠离子电池的高性能P2相Na 2/3 Mn 0.8 Fe 0.1 Ti 0.1 O 2阴极材料
通过陶瓷法合成了高性能的富Mn的P2相Na 2/3 Mn 0.8 Fe 0.1 Ti 0.1 O 2，并证明了其稳定的电化学性能。23 Na固态NMR证实了过渡金属氧化物层中Ti 4+离子的取代和层间空间中Na +的快速迁移。原始电极的第二次充电/放电容量为146.57 / 144.16 mA·h·g –1，并且在C / 10的4.0–2.0 V电压范围内，在第50个循环时可保持95.09％的放电容量。在1C时，可逆比容量仍达到99.40 mA·h·g –1，从第二个周期到第300个周期，容量保持率达到了87.70％。此外，湿气电极的可逆容量达到130和80 mA·h·g –1以上C / 10和1C分别具有出色的容量保持能力。通过中子粉末衍射研究了两个电极的整体电化学性能与晶体结构特征之间的相关性。原始电极的晶体结构在充电/放电过程中的稳定性已通过原位X射线衍射进行了研究，其中在给定电压范围内仅发生固溶反应，但在2.2 V或更低电压下会发生小的双相机理。放电过程。在过渡金属位点的相对较小的取代（20％）导致稳定的电化学性能，这部分源于电化学循环过程中的结构稳定性。因此，小的共同替代（例如，
更新日期：2015-12-28
中文翻译：
适用于环境温度钠离子电池的高性能P2相Na 2/3 Mn 0.8 Fe 0.1 Ti 0.1 O 2阴极材料
通过陶瓷法合成了高性能的富Mn的P2相Na 2/3 Mn 0.8 Fe 0.1 Ti 0.1 O 2，并证明了其稳定的电化学性能。23 Na固态NMR证实了过渡金属氧化物层中Ti 4+离子的取代和层间空间中Na +的快速迁移。原始电极的第二次充电/放电容量为146.57 / 144.16 mA·h·g –1，并且在C / 10的4.0–2.0 V电压范围内，在第50个循环时可保持95.09％的放电容量。在1C时，可逆比容量仍达到99.40 mA·h·g –1，从第二个周期到第300个周期，容量保持率达到了87.70％。此外，湿气电极的可逆容量达到130和80 mA·h·g –1以上C / 10和1C分别具有出色的容量保持能力。通过中子粉末衍射研究了两个电极的整体电化学性能与晶体结构特征之间的相关性。原始电极的晶体结构在充电/放电过程中的稳定性已通过原位X射线衍射进行了研究，其中在给定电压范围内仅发生固溶反应，但在2.2 V或更低电压下会发生小的双相机理。放电过程。在过渡金属位点的相对较小的取代（20％）导致稳定的电化学性能，这部分源于电化学循环过程中的结构稳定性。因此，小的共同替代（例如，
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