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A new class of high capacity cation-disordered oxides for rechargeable lithium batteries: Li–Ni–Ti–Mo oxides
| Content Provider | Semantic Scholar |
|---|---|
| Author | Lee, Jin Hyuk Seo, Dong-Hwa Balasubramanian, Mahalingam Twu, Nancy Ceder, Gerbrand |
| Copyright Year | 2015 |
| Abstract | Recent successes with disordered Li-excess materials and applications of percolation theory have highlighted cation-disordered oxides as high capacity and energy density cathode materials. In this work, we present a new class of high capacity cation-disordered oxides, lithium-excess nickel titanium molybdenum oxides, which deliver capacities up to 250 mA h g−1. These materials were designed from percolation theory which predicts lithium diffusion to become facile in cation-disordered oxides as the lithium-excess level increases (x > 1.09 in LixTM2−xO2). The reversible capacity and rate capability in these compounds are shown to considerably improve with lithium excess. In particular, Li1.2Ni1/3Ti1/3Mo2/15O2 delivers up to 250 mA h g−1 and 750 W h kg−1 (∼3080 W h l−1) at 10 mA g−1. Combining in situ X-ray diffraction, X-ray absorption near edge spectroscopy, electron energy loss spectroscopy, and electrochemistry, we propose that first charging Li1.2Ni1/3Ti1/3Mo2/15O2 to 4.8 V occurs with Ni2+/Ni∼3+ oxidation, oxygen loss, and oxygen oxidation in this sequence, after which Mo6+ and Ti4+ can be reduced upon discharge. Furthermore, we discuss how oxygen loss with lattice densification can affect lithium diffusion in the material by decreasing the Li-excess level. From this understanding, strategies for further improvements are proposed, setting new guidelines for the design of high performance cation-disordered oxides for rechargeable lithium batteries. |
| Starting Page | 3255 |
| Ending Page | 3265 |
| Page Count | 11 |
| File Format | PDF HTM / HTML |
| DOI | 10.1039/C5EE02329G |
| Volume Number | 8 |
| Alternate Webpage(s) | http://scholar.harvard.edu/files/lixin/files/2015_lee_li_excess_lntmo.pdf |
| Alternate Webpage(s) | http://scholar.harvard.edu/files/lixin/files/2015_lee_li_excess_lntmo.pdf?m=1446955322 |
| Alternate Webpage(s) | http://web.mit.edu/ceder/publications/2015_Lee_Li_excess_LNTMO.pdf |
| Alternate Webpage(s) | https://doi.org/10.1039/C5EE02329G |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
