Eutectic salt-assisted planetary centrifugal deagglomeration for single-crystalline cathode synthesis

Moonsu Yoon, Yanhao Dong, Yimeng Huang, Baoming Wang, Junghwa Kim, Jin-Sung Park, Jaeseong Hwang, Jaehyun Park, Seok Ju Kang, Jaephil Cho () and Ju Li ()
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Moonsu Yoon: Massachusetts Institute of Technology
Yanhao Dong: Massachusetts Institute of Technology
Yimeng Huang: Massachusetts Institute of Technology
Baoming Wang: Massachusetts Institute of Technology
Junghwa Kim: Massachusetts Institute of Technology
Jin-Sung Park: Massachusetts Institute of Technology
Jaeseong Hwang: Ulsan National Institute of Science and Technology (UNIST)
Jaehyun Park: Ulsan National Institute of Science and Technology (UNIST)
Seok Ju Kang: Ulsan National Institute of Science and Technology (UNIST)
Jaephil Cho: Ulsan National Institute of Science and Technology (UNIST)
Ju Li: Massachusetts Institute of Technology

Nature Energy, 2023, vol. 8, issue 5, 482-491

Abstract: Abstract Single-crystalline layered cathodes are often desirable for advanced lithium-ion batteries. However, constrained by the accessible temperature range to prevent lithium evaporation, lattice defects and particle agglomerations, the production of single-crystalline cathodes with high phase purity, good electrochemical performance and scalability remains challenging. Here we invent a new mechanochemical activation process that offers a general solution to the conundrum of synthesizing coarse single-crystal cathodes with Li-/Mn-rich or Ni-rich chemistry, which differs from the equipment- and energy-intense and long-duration mechanochemical routes that are difficult to scale up. Our approach is based on interfacial reactive wetting, mediated by transient eutectic salts in situ melted by moderate mechanical agitations, to form a colloidal suspension of nanosized oxides dispersed in liquified lithium salts. It efficiently deagglomerates the polycrystalline precursors, repacks the crystals and homogenizes the lithium-salt distribution, thus enabling facile particle coarsening later into the single-crystalline morphology with improved electrochemical performance.

Date: 2023
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DOI: 10.1038/s41560-023-01233-8

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