| Autor: |
Ramalinga Kuruba, Ayyakkannu Manivannan, Sung Jae Chung, Rigved Epur, Prasad Prakash Patel, Moni Kanchan Datta, Prashanth H. Jampani, Prashant N. Kumta, Partha Saha, Bharat Gattu, Karan Kadakia |
| Rok vydání: |
2014 |
| Předmět: |
|
| Zdroj: |
Materials Science and Engineering: B. 188:1-7 |
| ISSN: |
0921-5107 |
| Popis: |
Nanocrystalline NaMn 2 O 4 with a crystallite size of ∼8–10 nm exhibiting a new close packed hexagonal crystalline form, different from the known stable orthorhombic ( Pbam or Pmnm symmetry) or monoclinic structures common to the Na–Mn–O system, has been synthesized by a high energy mechano-chemical milling process (HEMM) using Na 2 O 2 and Mn 2 O 3 as starting materials. The newly synthesized structure of NaMn 2 O 4 has been studied as a cathode for sodium ion rechargeable batteries. The HEMM derived NaMn 2 O 4 shows a 1st cycle discharge capacity ∼75 mAh/g, ∼86 mAh/g and ∼95 mAh/g when cycled at a rate of ∼40 mA/g in the potential window ∼2.0–4.0 V, ∼2–4.2 V and ∼2–4.5 V, respectively. The nanostructured NaMn 2 O 4 shows a fade in capacity of 0.3% per cycle and a moderate rate capability when cycled in the potential window 2–4 V. However, electrolyte decomposition occurring during charging of the electrode above ∼3.8 V needs to be resolved in order utilize the full capacity of NaMn 2 O 4 as well as improve the stability of the electrode. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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