Simultaneous Enhancement of Interfacial Stability and Kinetics of Single-Crystal LiNi<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> through Optimized Surface Coating and Doping.
basic_science · Level V
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- Record sourced from PubMed, PMID 33237783.
- Also identified by DOI 10.1021/acs.nanolett.0c03778.
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Abstract
Balancing interfacial stability and Li<sup>+</sup> transfer kinetics through surface engineering is a key challenge in developing high-performance battery materials. Although conformal coating enabled by atomic layer deposition (ALD) has shown great promise in controlling impedance increase upon cycling by minimizing side reactions at the electrode-electrolyte interface, the coating layer itself usually exhibits poor Li<sup>+</sup> conductivity and impedes surface charge transfer. In this work, we have shown that by carefully controlling postannealing temperature of an ultrathin ZrO<sub>2</sub> film prepared by ALD, Zr<sup>4+</sup> surface doping could be achieved for Ni-rich layered oxides to accelerate the charge transfer yet provide sufficient protection. Using single-crystal LiNi<sub>0.6</sub>Mn<sub>0.2</sub>Co<sub>0.2</sub>O<sub>2</sub> as a model material, we have shown that surface Zr<sup>4+</sup> doping combined with ZrO<sub>2</sub> coating can enhance both the cycle performance and rate capability during high-voltage operation. Surface doping via controllable postannealing of ALD surface coating layer reveals an attractive path toward developing stable and Li<sup>+</sup>-conductive interfaces for single-crystal battery materials.