高容量 O3 型 NaNi0.4Fe0.2Mn0.4O2 的制备与性能优化

IF 3.1 4区工程技术 Q2 ELECTROCHEMISTRY

Journal of The Electrochemical Society Pub Date : 2024-08-08 DOI:10.1149/1945-7111/ad6cfa

Xiaoning Li, Mengmeng Liu, Wenjuan Zhang, Yanli Zhang, Jiakun Zhou, Wenzhang Zhou, Naixin Wang, Weiwei Xu, KeHua Dai

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引用次数: 0

摘要

O3 型 NaNi0.4Fe0.2Mn0.4O2 阴极材料结构稳定，镍含量高，可实现稳定的高容量输出。然而，它们的性能还需要进一步提高。首先，我们研究了不同钠含量对 NaxNi0.4Fe0.2Mn0.4O2（x=0.85、0.9、0.95、1、1.05）材料的结构、形态和电化学性能的影响。Na0.9Ni0.4Fe0.2Mn0.4O2 材料在 2-4.1 V 和 2-4.2 V 电压范围内的初始放电比容量分别为 148.11 和 181.80 mAh-g-1。为了进一步优化材料的循环性能，我们在 NaNi0.4Fe0.2Mn0.4O2 中掺入了不同含量的钙。Ca2+ 的掺杂大大提高了材料的电化学性能。随后，我们合成了 Na0.96Ca0.02(NMF)0.95Zn0.05O2，双掺杂 NMF-Ca0.02Zn0.05 在 1-4.05 V 电压下可保持约 80% 的容量保持率，而在完整电池中，当截止电压升高到 4.15 V 时，容量保持率约为 70%。

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Preparation and Property Optimization of High Capacity O3-type NaNi0.4Fe0.2Mn0.4O2

O3-type NaNi0.4Fe0.2Mn0.4O2 cathode materials are structurally stable and have a high nickel content, allowing for stable high-capacity output. However, their performance needs further improvement. First, we investigated the effects of different sodium contents on the structure, morphology, and electrochemical performance of NaxNi0.4Fe0.2Mn0.4O2(x=0.85, 0.9, 0.95, 1, 1.05) materials. The Na0.9Ni0.4Fe0.2Mn0.4O2 material exhibited initial discharge specific capacities of 148.11 and 181.80 mAh·g-1 at voltage ranges of 2-4.1 V and 2-4.2 V, respectively. To further optimize the cycling performance of the material, we doped NaNi0.4Fe0.2Mn0.4O2 with different calcium contents. Ca2+ doping significantly enhanced the electrochemical performance of the material. Subsequently, we synthesized Na0.96Ca0.02(NMF)0.95Zn0.05O2, and the dual-doped NMF-Ca0.02Zn0.05 maintains approximately 80% capacity retention at 1-4.05 V, and around 70% as the cut-off voltage increases to 4.15 V in full cells.

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来源期刊

Journal of The Electrochemical Society 工程技术-电化学

CiteScore

7.20

自引率

12.80%

发文量

1369

审稿时长

1.5 months

期刊介绍： The Journal of The Electrochemical Society (JES) is the leader in the field of solid-state and electrochemical science and technology. This peer-reviewed journal publishes an average of 450 pages of 70 articles each month. Articles are posted online, with a monthly paper edition following electronic publication. The ECS membership benefits package includes access to the electronic edition of this journal.