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Stabilizing Nickel‐Rich Cathodes in Aqueous Process through Nanocellulose as Water Barrier

Journal Article · · Advanced Functional Materials
 [1];  [2];  [1];  [1];  [3];  [4];  [4];  [2];  [1]
  1. Department of Mechanical and Industrial Engineering Northeastern University Boston MA 02115 USA
  2. Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh PA 15260 USA
  3. X‐Ray Science Division Argonne National Laboratory Lemont IL 60439 USA
  4. Department of Chemical and Paper Engineering Western Michigan University Kalamazoo MI 49008 USA

Abstract Nickel‐rich LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NMC 811) cathode offers high voltage and high specific capacity, making it promising for high energy density batteries. However, large‐scale manufacturing of aqueous‐processed NMC 811 electrodes remains challenging due to proton exchange causing material decomposition and capacity loss. This work addresses this issue by constructing an in situ nanocellulose protective layer for NMC 811 particles via electrostatic interactions during the slurry preparation. For the first time, the interatomic spacing between inter‐chains of nanocellulose is measured through wide‐angle X‐ray scattering and demonstrate the ability to effectively confine interlayer water using atomistic simulations. Moreover, this nanocellulose coverage simultaneously minimizes Li + surface segregation and mitigates water infiltration. Owing to less material decomposition during the aqueous processing, nanocellulose‐protected NMC electrodes exhibit higher initial coulombic efficiency (83% vs 62% at 0.1C) and capacity (133 vs 59 mAh g −1 at 6C) than unprotected electrodes. Additionally, optimized aqueous‐processed NMC electrodes offer comparable or even superior electrochemical properties compared to the electrodes fabricated using the conventional toxic organic solvent, N‐methyl‐2‐pyrrolidone. Consequently, the developed approach enables affordable, sustainable aqueous processing for Nickel‐rich NMC 811 cathodes with excellent electrochemical performances.

Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0009111; SC0012704
OSTI ID:
2440939
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 35 Journal Issue: 3; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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