期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 9, 页码 3538-3545出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta07764h
关键词
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资金
- NSF
- X-tend Energy LLC [0928964]
- Nano Research Facility (NRF)
- National Science Foundation [ECS-0335765]
- Department of Energy, Environmental, and Chemical Engineering
- WUSTL
Lithium ion batteries have revolutionized portable electronics and have the potential to electrify the transportation sector. Lithium-rich cathode materials with the composition xLi(2)MnO(3)(1-x) Li(Ni1/3Mn1/3Co1/3)O-2 have received considerable attention as candidates for Plug-in Hybrid Electric Vehicles (PHEVs) and Electric Vehicles (EVs). Cathodes made from these materials display high capacity (>200 mAhg(-1)) and good cycling stability, offering twice the energy density of currently available intercalation materials. Unfortunately, their performance is plagued by voltage fade due to a layered-spinel phase transformation. Herein, using spray pyrolysis, we show that certain inexpensive trace level (<= 1%) dopants can help in mitigating voltage fade, when the material is cycled between 2.0-4.6 V. The dopants lead to greater capacity loss than what would be expected from a capacity that is strictly based on a change in the transitional-metal oxidation state. The results imply that a portion of the capacity of these materials comes from reversible oxygen chemistry. These findings could put a different perspective on fade mechanism prevention.
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