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Self-Passivation of a LiNiO2 Cathode for a Lithium-Ion Battery through Zr Doping
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-15 00:00:00 , DOI: 10.1021/acsenergylett.8b00805 Chong S. Yoon 1 , Un-Hyuck Kim 2 , Geon-Tae Park 2 , Suk Jun Kim 3 , Kwang-Ho Kim 4 , Jaekook Kim 5 , Yang-Kook Sun 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-06-15 00:00:00 , DOI: 10.1021/acsenergylett.8b00805 Chong S. Yoon 1 , Un-Hyuck Kim 2 , Geon-Tae Park 2 , Suk Jun Kim 3 , Kwang-Ho Kim 4 , Jaekook Kim 5 , Yang-Kook Sun 2
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A self-passivating Li2ZrO3 layer with a thickness of 5–10 nm, which uniformly encapsulates the surfaces of LiNiO2 cathode particles, is spontaneously formed by introducing excess Zr (1.4 atom %). A thin layer of Li2ZrO3 on the surface is converted into a stable impedance-lowering solid–electrolyte interphase layer during subsequent cycles. The Zr-doped LiNiO2 cathode with an initial discharge capacity of 233 mA·h·g–1 exhibited significantly improved capacity retention (86% after 100 cycles) and thermal stability, compared to the undoped LiNiO2. While the spontaneously formed Zr-rich coating layer provides surface protection, the Zr ions in the LiNiO2 lattice delay the detrimental phase transition occurring in the deeply charged state of LiNiO2 and partially suppress the anisotropic strain emerging from the phase transition. Further optimization of the proposed simultaneous coating and doping strategy can mitigate the inherent structural instability of the LiNiO2 cathode, making it a promising high-energy-density cathode for electric vehicles.
中文翻译：
通过Zr掺杂实现锂离子电池的LiNiO 2阴极自钝化
通过引入过量的Zr（1.4原子％）自发形成厚度为5-10 nm的自钝化Li 2 ZrO 3层，该层均匀地封装了LiNiO 2阴极颗粒的表面。在随后的循环中，表面上的Li 2 ZrO 3薄层将转变为稳定的降低阻抗的固-电解质中间相层。中Zr掺杂的LiNiO 2阴极与233毫安的初始放电容量·h·克-1表现出改善显著容量保持率（100次循环后86％）和热稳定性，相对于未掺杂的LiNiO 2。而自发形成的富Zr皮膜层提供表面保护，Zr离子在的LiNiO 2晶格延迟的有害相变发生在的LiNiO的处于深度充电状态2并部分地抑制各向异性的应变从相变出现。提出的同时涂覆和掺杂策略的进一步优化可以减轻LiNiO 2阴极固有的结构不稳定性，使其成为电动汽车有希望的高能量密度阴极。
更新日期：2018-06-15
中文翻译：
通过Zr掺杂实现锂离子电池的LiNiO 2阴极自钝化
通过引入过量的Zr（1.4原子％）自发形成厚度为5-10 nm的自钝化Li 2 ZrO 3层，该层均匀地封装了LiNiO 2阴极颗粒的表面。在随后的循环中，表面上的Li 2 ZrO 3薄层将转变为稳定的降低阻抗的固-电解质中间相层。中Zr掺杂的LiNiO 2阴极与233毫安的初始放电容量·h·克-1表现出改善显著容量保持率（100次循环后86％）和热稳定性，相对于未掺杂的LiNiO 2。而自发形成的富Zr皮膜层提供表面保护，Zr离子在的LiNiO 2晶格延迟的有害相变发生在的LiNiO的处于深度充电状态2并部分地抑制各向异性的应变从相变出现。提出的同时涂覆和掺杂策略的进一步优化可以减轻LiNiO 2阴极固有的结构不稳定性，使其成为电动汽车有希望的高能量密度阴极。
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