Fabrication of Low-Tortuosity Ultrahigh-Area-Capacity Battery Electrodes through Magnetic Alignment of Emulsion-Based Slurries

Li, Linsen; Erb, Randall M.; Wang, Jiajun; Wang, Jun; Chiang, Yet -Ming

doi:10.1002/aenm.201802472

Fabrication of Low-Tortuosity Ultrahigh-Area-Capacity Battery Electrodes through Magnetic Alignment of Emulsion-Based Slurries

Journal Article · Tue Nov 27 23:00:00 EST 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201802472· OSTI ID:1498274

Li, Linsen ^[1]; Erb, Randall M. ^[2]; Wang, Jiajun ^[3]; Wang, Jun ^[3]; ^[4]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Shanghai Jiao Tong Univ., Shanghai, (China); Shanghai Electrochemical Energy Devices Research Center, Shanghai (China)
Northeastern Univ., Boston, MA (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

High energy–density, low–cost batteries are critically important to a variety of applications ranging from portable electronics to electric vehicles (EVs) and grid–scale storage. While tremendous research effort has been focused on new materials or chemistries with high energy–density potential, design innovations such as low–tortuosity thick electrodes are another promising path toward higher energy density and lower cost. Growing demand for fast–charging batteries has also highlighted the need for negative electrodes that can accept high rate charging without metal deposition; low tortuosity can be a benefit in this regard. However, a general and scalable fabrication method for low–tortuosity electrodes is currently lacking. Here an emulsion–based, magnetic–alignment approach to producing thick electrodes (>400 µm thickness) with ultrahigh areal capacity (up to ≈14 mAh cm^–2 vs 2–4 mAh cm^–2 for conventional lithium ion) is reported. The process is demonstrated for LiCoO₂ and meso–carbon microbead graphite. The LiCoO₂ cathodes are confirmed to have low tortuosity via DC–depolarization experiments and deliver high areal capacity (>10 mAh cm^–2) in galvanostatic discharge tests at practical C–rates and model EV drive–cycle tests. Lastly, this simple fabrication method can potentially be applied to many other active materials to enable thick, low–tortuosity electrodes.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1498274

Alternate ID(s):: OSTI ID: 1483709
OSTI ID: 1493798

Report Number(s):: BNL--211313-2019-JAAM

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 2 Vol. 9; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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