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Design and synthesis of high-energy-density heterostructure Na0.7MnO2–Li4Mn5O12 cathode material for advanced lithium batteries.
- Source :
- New Journal of Chemistry; 11/28/202, Vol. 46 Issue 44, p21350-21355, 6p
- Publication Year :
- 2022
-
Abstract
- The heterostructures, xNa<subscript>0.7</subscript>MnO<subscript>2</subscript>–yLi<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript>(0 < x < 1, 0 < y ≤ 1), were synthesized by a solid-phase method. X-Ray diffraction (XRD) analyses revealed that the as-prepared samples were heterostructures Na<subscript>0.7</subscript>MnO<subscript>2</subscript> and Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript>. Electron microscopy was used to study the lattice fingerprint area of 0.6Na<subscript>0.7</subscript>MnO<subscript>2</subscript>–0.4Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript> that showed (111) crystal surface of Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript> and (002) crystal surface of Na<subscript>0.7</subscript>MnO<subscript>2</subscript>. With different molar ratios of lithium and sodium, Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript> and Na<subscript>0.7</subscript>MnO<subscript>2</subscript> in the formed heterostructure will change accordingly, during the synthesis process. The XPS data also showed that Mn<superscript>3+</superscript>/Mn<superscript>4+</superscript> in the materials presented different ratios. The heterostructure, 0.6Na<subscript>0.7</subscript>MnO<subscript>2</subscript>–0.4Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript>, exhibits superior high-rate capability and excellent cycle performance. The rate discharge capacity of 0.6Na<subscript>0.7</subscript>MnO<subscript>2</subscript>–0.4Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript> was maintained at 163.25 mA h g<superscript>−1</superscript> at 500 mA g<superscript>−1</superscript>. When cycled at 100 mA g<superscript>−1</superscript>, the discharge capacity was maintained at 189.80 mA h g<superscript>−1</superscript> after 50 cycles. The construction of heterostructure can take the advantage of the high capacity of the layered structure of Na<subscript>0.7</subscript>MnO<subscript>2</subscript> and the stable spinel structure of Li<subscript>4</subscript>Mn<subscript>5</subscript>O<subscript>12</subscript>, which can form a synergistic effect and improve the electrochemical performance of cathode materials. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 46
- Issue :
- 44
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 160203417
- Full Text :
- https://doi.org/10.1039/d2nj03731a