Achieving high capacity and rate capability in layered lithium transition metal oxide cathodes for lithium-ion batteries
| Autor: | Jae Kyo Noh, Ghulam Ali, Jong Hak Kim, Si Hyoung Oh, Juhyeon Ahn, Byung Won Cho, Kyung Yoon Chung, Dieky Susanto |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Cathode 0104 chemical sciences Ion law.invention chemistry.chemical_compound chemistry Transition metal Chemical engineering Structural stability law Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry Absorption (chemistry) 0210 nano-technology |
| Zdroj: | Journal of Power Sources. 360:575-584 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2017.06.042 |
| Popis: | In this study, we target to find a new composition for a layered mixed metal oxide, which has a high structural stability and a good electrochemical performance. Our strategy is to alter the transition metal composition focusing on the relative amounts of redox active Ni and Co to the inactive Mn, based on highly-stabilized LiNi 1/3 Co 1/3 Mn 1/3 O 2 . X-ray absorption near-edge structure and X-ray diffraction analyses show that the degree of cation disorder decreases on increasing the ratio of Ni and Co to Mn, by the presence of Ni 3+ , suggesting that slightly higher Ni and Co contents lead to improved structural stability. Electrochemical studies demonstrate that LiNi 0.4 Co 0.4 Mn 0.2 O 2 cathodes exhibit considerable improvements in both the reversible capacity and the rate capabilities at a voltage range of 2.5–4.6 V. In situ XRD measurements reveal that LiNi 0.4 Co 0.4 Mn 0.2 O 2 maintains a single-phase and undergoes lesser structural variations compared to controlled compositions during a delithiation process up to 4.6 V, while achieving a high reversible capacity over 200 mAh g −1 . As a result, LiNi 0.4 Co 0.4 Mn 0.2 O 2 experiences fewer structural degradations during electrochemical cycling, which explains the excellent long-term cycling performance. |
| Databáze: | OpenAIRE |
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