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
- Authors
- Lim, Byung-Beom; Myung, Seung-Taek; Yoon, Chong S.; Sun, Yang-Kook
- Issue Date
- Jul-2016
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS ENERGY LETTERS, v.1, no.1, pp.283 - 289
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS ENERGY LETTERS
- Volume
- 1
- Number
- 1
- Start Page
- 283
- End Page
- 289
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/5555
- DOI
- 10.1021/acsenergylett.6b00150
- ISSN
- 2380-8195
- Abstract
- 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 boundaries upon cycling.
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