Modified High‐Nickel Cathodes with Stable Surface Chemistry Against Ambient Air for Lithium‐Ion Batteries

Journal Article · 25 April 2018 · Angewandte Chemie

DOI: https://doi.org/10.1002/ange.201801533 · OSTI ID:1439116

You, Ya ^[1]; Celio, Hugo ^[1]; Li, Jianyu ^[1]; Dolocan, Andrei ^[1]; Manthiram, Arumugam  ^[1]

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1. Materials Science and Engineering Program and Texas Materials Institute The University of Texas at Austin Austin TX 78712 USA

Abstract High‐Ni layered oxides are promising next‐generation cathodes for lithium‐ion batteries owing to their high capacity and lower cost. However, as the Ni content increases over 70 %, they have a high dynamic affinity towards moisture and CO ₂ in ambient air, primarily reacting to form LiOH, Li ₂ CO ₃ , and LiHCO ₃ on the surface, which is commonly termed “residual lithium”. Air exposure occurs after synthesis as it is common practice to handle and store them under ambient conditions. The air exposure leads to significant performance losses, and hampers the electrode fabrication, impeding their practical viability. Herein, we show that substituting a small amount of Al for Ni in the crystal lattice notably improves the chemical stability against air by limiting the formation of LiOH, Li ₂ CO ₃ , LiHCO ₃ , and NiO in the near‐surface region. The Al‐doped high‐Ni oxides display a high capacity retention with excellent rate capability and cycling stability after being exposed to air for 30 days.

• Sponsoring Organization: USDOE
• Grant/Contract Number: EE0007762
• OSTI ID: 1439116
• Journal Information: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 130 Journal Issue: 22; ISSN 0044-8249
• Publisher: Wiley Blackwell (John Wiley & Sons)Copyright Statement
• Country of Publication: Germany
• Language: English