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Title: Effect of Cobalt and Nickel Contents on the Performance of Lithium Rich Materials Synthesized in Glycerol Solvent

Abstract

Lithium-rich cathode materials in the form of Li 1.2Mn 0.51N i0.145+xCo 0.145-xO 2 (x = 0 (LR2), 0.0725 (LR1)) have been successfully synthesized by a sol-gel method using glycerol as solvent. These materials were characterized by X-ray diffractions (XRD), scanning electron microscopy (SEM), and electrochemical measurements. XRD patterns showed that both materials have typical diffraction peaks of Li-rich material with a well-crystallized structure, but the LR1 sample with less Co has a well-distinguished Li2MnO3 peak between 20°–25°. SEM images demonstrate that LR1 also has a more uniform particle distribution. Electrochemical measurements revealed that LR2 with more Co has a higher initial discharge capacity of 223 mAh/g than LR1 of 185 mAh/g at 0.1 C between 2 and 4.8 V. However, LR1 was observed to have an increasingly improved capacity over several dozens of cycles. The specific discharge capacity of LR1 increased from 185 to 213 mAh/g after 20 cycles. This is ascribed to a gradual activation of the Li-rich phase from the surface of the particles. It is shown that the smaller Co/Mn ratio (1:7.134) of LR1 plays an important role in its continuous activation. Its capacity retention is 98% at 100 cycles at 1C rate, better than that ofmore » LR2 and most previously reported lithium-rich materials.« less

Authors:
 [1]; ORCiD logo [1]
  1. Univ. of Missouri, Columbia, MO (United States)
Publication Date:
Research Org.:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1509881
Grant/Contract Number:  
EE0007282
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 11; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Glycerol solvent; Lithium-rich material; Sol-gel synthesis

Citation Formats

Hamad, Khaleel I., and Xing, Yangchuan. Effect of Cobalt and Nickel Contents on the Performance of Lithium Rich Materials Synthesized in Glycerol Solvent. United States: N. p., 2018. Web. doi:10.1149/2.0311811jes.
Hamad, Khaleel I., & Xing, Yangchuan. Effect of Cobalt and Nickel Contents on the Performance of Lithium Rich Materials Synthesized in Glycerol Solvent. United States. doi:10.1149/2.0311811jes.
Hamad, Khaleel I., and Xing, Yangchuan. Sat . "Effect of Cobalt and Nickel Contents on the Performance of Lithium Rich Materials Synthesized in Glycerol Solvent". United States. doi:10.1149/2.0311811jes. https://www.osti.gov/servlets/purl/1509881.
@article{osti_1509881,
title = {Effect of Cobalt and Nickel Contents on the Performance of Lithium Rich Materials Synthesized in Glycerol Solvent},
author = {Hamad, Khaleel I. and Xing, Yangchuan},
abstractNote = {Lithium-rich cathode materials in the form of Li1.2Mn0.51Ni0.145+xCo0.145-xO2 (x = 0 (LR2), 0.0725 (LR1)) have been successfully synthesized by a sol-gel method using glycerol as solvent. These materials were characterized by X-ray diffractions (XRD), scanning electron microscopy (SEM), and electrochemical measurements. XRD patterns showed that both materials have typical diffraction peaks of Li-rich material with a well-crystallized structure, but the LR1 sample with less Co has a well-distinguished Li2MnO3 peak between 20°–25°. SEM images demonstrate that LR1 also has a more uniform particle distribution. Electrochemical measurements revealed that LR2 with more Co has a higher initial discharge capacity of 223 mAh/g than LR1 of 185 mAh/g at 0.1 C between 2 and 4.8 V. However, LR1 was observed to have an increasingly improved capacity over several dozens of cycles. The specific discharge capacity of LR1 increased from 185 to 213 mAh/g after 20 cycles. This is ascribed to a gradual activation of the Li-rich phase from the surface of the particles. It is shown that the smaller Co/Mn ratio (1:7.134) of LR1 plays an important role in its continuous activation. Its capacity retention is 98% at 100 cycles at 1C rate, better than that of LR2 and most previously reported lithium-rich materials.},
doi = {10.1149/2.0311811jes},
journal = {Journal of the Electrochemical Society},
number = 11,
volume = 165,
place = {United States},
year = {2018},
month = {8}
}

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Works referenced in this record:

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