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Electrolyte Study for High-Nickel LiNi0.9Mn0.05Co0.05O2 Cathodes

Journal Article · · Journal of the Electrochemical Society
 [1];  [2];  [2];  [2];  [2];  [2];  [3];  [2];  [2];  [4]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Connecticut, Storrs, CT (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States)
  3. Univ. of Connecticut, Storrs, CT (United States)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States). Joint Center for Energy Storage Research (JCESR)
+ Show Author Affiliations
With an increasing demand for intermittent renewable energy and electric vehicles, it is imperative to develop lithium-ion batteries with Earth-abundant cathode materials. Cobalt (Co) is preferred to be kept at a minimum because of its high cost and limited mining options, yet it has played an essential role in the high-performance transition metal oxides (TMOs). Herein, we report work from Argonne National Laboratory, conducted under the U.S. DoE's Vehicle Technologies Office, Deep Dive consortium on Next-Generation Cathodes, to optimize electrolytes for LiNi0.9Mn0.05Co0.05O2. LiNi0.9Mn0.05Co0.05O2 is a high-Ni TMO benchmark as it outperforms most other TMOs under standard cycling conditions. In this study, we use the figure-of-merit approach to optimize electrolytes for this novel cathode material. Dual-salt carbonate electrolytes containing lithium difluorooxyphosphate and hexafluorophosphates were found to be the best for capacity retention and slowing the impedance rise. Importantly, transition metal dissolution and lithium inventory losses in the solid electrolyte interface were found to be the major causes for capacity fade.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Vehicle Technologies Office (VTO); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2290281
Journal Information:
Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 170; ISSN 0013-4651
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (13)

Scheme 1(p. 10)figure Scheme 1
Table 1(p. 11)table Table 1
Figure 1(p. 12)figure Figure 1
Figure 2(p. 13)figure Figure 2
Figure 3(p. 14)figure Figure 3
Figure 4(p. 15)figure Figure 4
Figure 5(p. 15)figure Figure 5
Figure 6(p. 16)figure Figure 6
Figure 7(p. 17)figure Figure 7
Figure 8(p. 18)figure Figure 8
Figure 9(p. 19)figure Figure 9
Figure 10(p. 20)figure Figure 10
Table 2(p. 20)table Table 2

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Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ni-rich cathodes
additives
impedance rise
solvents
transesterification
transition metal dissolution