Concurrently Approaching Volumetric and Specific Capacity Limits of Lithium Battery Cathodes via Conformal Pickering Emulsion Graphene Coatings

Journal Article · 17 May 2020 · Advanced Energy Materials

DOI: https://doi.org/10.1002/aenm.202001216 · OSTI ID:1630156

Park, Kyu‐Young ^[1]; Lim, Jin‐Myoung ^[1]; Luu, Norman S. ^[1]; Downing, Julia R. ^[1]; Wallace, Shay G. ^[1]; Chaney, Lindsay E. ^[1]; Yoo, Hocheon ^[1]; Hyun, Woo Jin ^[1]; Kim, Hyeong‐U ^[2]; Hersam, Mark C.  ^[3]

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1. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
2. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA, SKKU Advanced Institute of Nanotechnology Sungkyunkwan University (SKKU) Suwon Gyeonggi‐do 16419 Korea
3. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA, Department of Chemistry Northwestern University Evanston IL 60208 USA, Department of Electrical and Computer Engineering Northwestern University Evanston IL 60208 USA

Abstract To achieve the high energy densities demanded by emerging technologies, lithium battery electrodes need to approach the volumetric and specific capacity limits of their electrochemically active constituents, which requires minimization of the inactive components of the electrode. However, a reduction in the percentage of inactive conductive additives limits charge transport within the battery electrode, which results in compromised electrochemical performance. Here, an electrode design that achieves efficient electron and lithium‐ion transport kinetics at exceptionally low conductive additive levels and industrially relevant active material areal loadings is introduced. Using a scalable Pickering emulsion approach, Ni‐rich LiNi _0.8 Co _0.15 Al _0.05 O ₂ (NCA) cathode powders are conformally coated using only 0.5 wt% of solution‐processed graphene, resulting in an electrical conductivity that is comparable to 5 wt% carbon black. Moreover, the conformal graphene coating mitigates degradation at the cathode surface, thus providing improved electrochemical cycle life. The morphology of the electrodes also facilitates rapid lithium‐ion transport kinetics, which provides superlative rate capability. Overall, this electrode design concurrently approaches theoretical volumetric and specific capacity limits without tradeoffs in cycle life, rate capability, or active material areal loading.

• Sponsoring Organization: USDOE
• OSTI ID: 1630156
• Journal Information: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 25 Vol. 10; ISSN 1614-6832
• Publisher: Wiley Blackwell (John Wiley & Sons)Copyright Statement
• Country of Publication: Germany
• Language: English