Improving the Performance at Elevated Temperature of High Voltage Graphite/LiNi 0.5Mn 1.5O 4 Cells with Added Lithium Catechol Dimethyl Borate
Performance of LiNi 0.5Mn 1.5O 4/graphite cells cycled to 4.8 V at 55°C with the 1.2 M LiPF 6 in EC/EMC (3/7, STD electrolyte) with and without added lithium catechol dimethyl borate (LiCDMB) has been investigated. The incorporation of 0.5 wt% LiCDMB to the STD electrolyte results in an improved capacity retention and coulombic efficiency upon cycling at 55°C. Ex-situ analysis of the electrode surfaces via a combination of SEM, TEM, and XPS reveals that oxidation of LiCDMB at high potential results in the deposition of a passivation layer on the electrode surface, preventing transition metal ion dissolution from the cathode and subsequent deposition on the anode. NMR investigations of the bulk electrolyte stored at 85°C reveals that added LiCDMB prevents the thermal decomposition of LiPF 6.
- Authors:
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- Univ. of Rhode Island, Kingston, RI (United States). Dept. of Chemistry
- Publication Date:
- Grant/Contract Number:
- SC0007074
- Type:
- Accepted Manuscript
- Journal Name:
- Journal of the Electrochemical Society
- Additional Journal Information:
- Journal Volume: 164; Journal Issue: 2; Journal ID: ISSN 0013-4651
- Publisher:
- The Electrochemical Society
- Research Org:
- Brown Univ., Providence, RI (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 25 ENERGY STORAGE; Electrolyte; High Voltage; Lithium Ion Battery; surface film
- OSTI Identifier:
- 1425633
- Free Publicly Accessible Full Text
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Accepted Manuscript (DOE)
- Publisher's Version of Record
- https://doi.org/10.1149/2.0331702jes