Understanding cation doping achieved by atomic layer deposition for high-performance Li-Ion batteries

Gao, Yan; He, Xiaoqing; Ma, Lu; Wu, Tianpin; Park, Jonghyun; Liang, Xinhua

doi:10.1016/j.electacta.2020.135951

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Understanding cation doping achieved by atomic layer deposition for high-performance Li-Ion batteries

Gao, Yan·He, Xiaoqing·Ma, Lu·Wu, Tianpin·Park, Jonghyun·Liang, Xinhua

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Abstract

As Li ion battery (LIB) technology develops, its nanoscale design is attracting more and more interest. Atomic layer deposition (ALD) has emerged as a promising technique to provide conformal and ultrathin coating for LIB materials. In this work, an iron oxide (FeO x ) ALD was performed on LiMn 1.5 Ni 0.5 O-5 4 (LMNO) cathode particles, followed by an annealing process. Here, Fe was doped into LMNO during the ALD process; and it was found that lattice oxygen loss and structural change of LMNO occurred at a reaction temperature of 450 °C under vacuum. Meanwhile, Fe diffused from the surface to the bulk of LMNO. After post-annealing, FeO x -coated LMNO recovered its structure and lattice oxygen under proper annealing conditions, and exhibited significant enhancement of specific capacity, rate capability, and cyclic stability.

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25 ENERGY STORAGE Atomic layer deposition Fe doping LiMn1.5Ni0.5O4 (LMNO)Post-annealing

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Gao, Yan, He, Xiaoqing, Ma, Lu, Wu, Tianpin, Park, Jonghyun, Liang, Xinhua. 2020-03-02. Understanding cation doping achieved by atomic layer deposition for high-performance Li-Ion batteries. https://doi.org/10.1016/j.electacta.2020.135951

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