Comparative Study of Ni-Rich Layered Cathodes for Rechargeable Lithium Batteries: Li[Ni0.85Co0.11Al0.04]O2 and Li[Ni0.84Co0.06Mn0.09Al0.01]O2 with Two-Step Full Concentration Gradients
| Autor: | Chong Seung Yoon, Byung Beom Lim, Yang-Kook Sun, Seung-Taek Myung |
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| Rok vydání: | 2016 |
| Předmět: |
Morphology (linguistics)
Materials science Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences law.invention law Materials Chemistry Surface layer Renewable Energy Sustainability and the Environment respiratory system 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Fuel Technology chemistry Chemical engineering Chemistry (miscellaneous) Degradation (geology) Particle Lithium 0210 nano-technology Concentration gradient |
| Zdroj: | ACS Energy Letters. 1:283-289 |
| ISSN: | 2380-8195 |
| DOI: | 10.1021/acsenergylett.6b00150 |
| Popis: | Compositionally graded Li[Ni0.84Co0.06Mn0.09Al0.01]O2 (TSFCG-Al) with two-step concentration gradients was prepared as a high-capacity cathode for Li batteries. The concentration gradients were introduced within a single particle to maximize the Ni fraction; this increased the discharge capacity while ensuring cyclic stability with a Mn-enriched surface layer. The concentration gradients also produced a unique morphology, in which rod-shaped primary particles were radially aligned in a spoke-like pattern. The fundamental electrochemical performance of TSFCG-Al is compared against that of commercial Li[Ni0.85Co0.11Al0.04]O2 (NCA). The TSFCG-Al cathode exhibits a higher discharge capacity and better cycling stability than the NCA cathode, even when they are charged to 4.5 V. Structural analysis of the cycled TSFCG-Al and NCA cathodes shows that the TSFCG-Al keeps its original structural integrity, while the NCA particles undergo serious particle degradation due to the accumulation of strain in the grain bou... |
| Databáze: | OpenAIRE |
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