Distinct electrochemical behavior of P3 and P2 polytypes of Mn/Ni-based Na-ion battery cathode

被引：3
|
作者：
Dagar, Neha [1 ]
Saxena, Samriddhi [1 ]
Vasavan, Hari Narayanan [1 ]
Das, Asish Kumar [1 ]
Gami, Pratiksha [1 ]
Deswal, Sonia [2 ]
Kumar, Pradeep [2 ]
Kumar, Sunil [1 ]
机构：
[1] Indian Inst Technol Indore, Dept Met Engn & Mat Sci, Simrol 453552, India
[2] Indian Inst Technol Mandi, Sch Phys Sci, Mandi 175005, India
来源：
MATERIALS LETTERS | 2024年 / 369卷
关键词：
Sol -gel preparation; X-ray techniques; Electrical properties; Energy storage and conversion;
D O I：
10.1016/j.matlet.2024.136768
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A layered sodium-ion battery cathode Na3/4Mn11/16Ni3/16Al2/16O2 (NMNA) prepared in P3 and P2 polytype structures by varying the calcination temperature is systematically investigated for its structural and electrochemical behavior. P3-phase prepared at 650 degrees C delivered a higher initial capacity of 164 mAh/g (similar to 148 mAh/g for P2-phase calcined at 850 degrees C) at 0.1C. In contrast, the P2-phase sample exhibited better rate performance (87 mAh/g vs. 70 mAh/g for P3-phase at 4C) and capacity retention of similar to 47 % after 200 cycles (only similar to 26 % for P2-phase). Electrochemical impedance measurements before and after cycling confirmed that the increase in charge transfer resistance is responsible for the poor rate performance of the P3 phase.
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页数：5
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