Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1283709 | Journal of Power Sources | 2016 | 8 Pages |
Abstract
In this study, a new class of contenders for high-voltage and high-capacity positive electrode materials with the composition NaxLi0.7âxNi1âyMnyO2 (0.03 < x â¤Â 0.25, 0.5 â¤Â y â¤Â 0.8) was synthesized by thermal treatment; these positive electrode materials synthesized by Na+/Li+ exchange using P3Na0.7Ni1âyMnyO2 (0.5 â¤Â y â¤Â 0.8) as the precursor exhibited a mixture of layered and spinel structures. The (dis)charge voltage-capacity curve of materials with these compositions significantly varied according to the residual Na and Mn content. Notably, HT-NaxLi0.7âxNi1âyMnyO2 (x = 0.093, y = 0.67) exhibited a maximum discharge capacity of 261 mA h gâ1 at an average voltage of 3.36 V at 25 °C (between 2.0 and 4.8 V), which translates to an energy density of 943 W h kgâ1. The obtained electrochemical performance is rationalized by the phase fractions of layered and spinel structures, which is triggered by the residual Na and Mn content in NaxLi0.7âxNi1âyMnyO2.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Kazuki Chiba, Noboru Taguchi, Masahiro Shikano, Hikari Sakaebe,