Journal article
Vanadium-Substituted LiCoPO4 Core with a Monolithic LiFePO4 Shell for High-Voltage Lithium-Ion Batteries
ACS energy letters, Vol.2(1), pp.64-69
01/13/2017
DOI: 10.1021/acsenergylett.6b00496
Abstract
High-voltage lithium-ion cathodes are a promising solution for achieving higher energy density batteries. However, the use of high-voltage cathodes is presently limited by the irreversible chemical reactions occurring between the cathode and the electrolyte at the high operating voltages. Metal-oxide coatings on micrometer-sized high-voltage cathode materials have been employed to improve the electrochemical performance, but it is often difficult to achieve a robust, durable, monolithic coating on nanoparticles. This study presents a low-temperature microwave-assisted solvothermal process for realizing a robust, monolithic coating of LiFePO4 on the high-voltage (∼4.8 V) LiCo1–3x/2Vx□x/2PO4 (x = 0, 0.02, and 0.04) nanoparticles, offering a stable cathode–electrolyte interface. The core–shell cathode obtained exhibits enhanced electrochemical performance compared to the uncoated sample with an initial discharge capacity of 145 mAh/g. A lower operating voltage of LiFePO4 (∼3.4 V) raises the Fermi energy of the cathode surface above the energy of the highest occupied molecular orbital of the electrolyte, offering a chemically stable cathode–electrolyte interface analogous to the stable solid electrolyte interphase layer formed on carbon anodes.
Details
- Title: Subtitle
- Vanadium-Substituted LiCoPO4 Core with a Monolithic LiFePO4 Shell for High-Voltage Lithium-Ion Batteries
- Creators
- Karl J Kreder - Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United StatesArumugam Manthiram - Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States
- Resource Type
- Journal article
- Publication Details
- ACS energy letters, Vol.2(1), pp.64-69
- DOI
- 10.1021/acsenergylett.6b00496
- ISSN
- 2380-8195
- eISSN
- 2380-8195
- Grant note
- DOI: 10.13039/100006151, name: Basic Energy Sciences, award: DE-SC0005397
- Language
- English
- Date published
- 01/13/2017
- Academic Unit
- Obstetrics and Gynecology; Urology
- Record Identifier
- 9984051712302771
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