Journal
ACS ENERGY LETTERS
Volume 1, Issue 1, Pages 283-289Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00150
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Funding
- Global Frontier R&D Program of Center for Hybrid Interface Materials (HIM) - Ministry of Science, ICT & Future Planning [2013M3A6B1078875]
- National Research Foundation of Korea (NRF) grant - Korean government (MEST) [2014R1A2A1A13050479]
- National Research Foundation of Korea [2014R1A2A1A13050479, 2013M3A6B1078875] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Compositionally graded Li[Ni0.84Co0.06Mn0.09Al0.01]O-2 (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]O-2 (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 upon cycling.
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