Mitigating the Surface Degradation and Voltage Decay of Li 1.2 Ni 0.13 Mn 0.54 Co 0.13 O 2 Cathode Material through Surface Modification Using Li 2 ZrO 3 .

Autor: Prakasha KR; CSIR - Network Institutes of Solar Energy (CSIR - NISE) and Academy of Scientific and Innovative Research (AcSIR), CSIR - Central Electrochemical Research Institute-Chennai Unit, CSIR Madras Complex, Taramani, Chennai 600113, India.; CSIR - Network Institutes of Solar Energy (CSIR - NISE) and Academy of Scientific and Innovative Research (AcSIR), CSIR - Central Electrochemical Research Institute-Chennai Unit, CSIR Madras Complex, Taramani, Chennai 600113, India., Sathish M; Functional Materials Division, CSIR - Central Electrochemical Research Institute, Karaikudi 630003, India., Bera P; Surface Engineering Division, CSIR - National Aerospace Laboratories, Bengaluru 560017, India., Prakash AS; CSIR - Network Institutes of Solar Energy (CSIR - NISE) and Academy of Scientific and Innovative Research (AcSIR), CSIR - Central Electrochemical Research Institute-Chennai Unit, CSIR Madras Complex, Taramani, Chennai 600113, India.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2017 May 25; Vol. 2 (5), pp. 2308-2316. Date of Electronic Publication: 2017 May 25 (Print Publication: 2017).
DOI: 10.1021/acsomega.7b00381
Abstrakt: In the quest to tackle the issue of surface degradation and voltage decay associated with Li-rich phases, Li-ion conductive Li 2 ZrO 3 (LZO) is coated on Li 1.2 Ni 0.13 Mn 0.54 Co 0.13 O 2 (LNMC) by a simple wet chemical process. The LZO phase coated on LNMC, with a thickness of about 10 nm, provides a structural integrity and facilitates the ion pathways throughout the charge-discharge process, which results in significant improvement of the electrochemical performances. The surface-modified cathode material exhibits a reversible capacity of 225 mA h g -1 (at C/5 rate) and retains 85% of the initial capacity after 100 cycles. Whereas, the uncoated pristine sample shows a capacity of 234 mA h g -1 and retains only 57% of the initial capacity under identical conditions. Electrochemical impedance spectroscopy reveals that the LZO coating plays a vital role in stabilizing the interface between the electrode and electrolyte during cycling; thus, it alleviates material degradation and voltage fading and ameliorates the electrochemical performance.
Competing Interests: The authors declare no competing financial interest.
Databáze: MEDLINE
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