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Microstructure Engineered Ni-Rich Layered Cathode for Electric Vehicle Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-05-12 , DOI: 10.1002/aenm.202100884
Un‐Hyuck Kim 1 , Jeong‐Hyeon Park 1 , Assylzat Aishova 1 , Rogério M. Ribas 2 , Robson S. Monteiro 2 , Kent J. Griffith 3 , Chong S. Yoon 4 , Yang‐Kook Sun 1, 5
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2021-05-12 , DOI: 10.1002/aenm.202100884
Un‐Hyuck Kim 1 , Jeong‐Hyeon Park 1 , Assylzat Aishova 1 , Rogério M. Ribas 2 , Robson S. Monteiro 2 , Kent J. Griffith 3 , Chong S. Yoon 4 , Yang‐Kook Sun 1, 5
Affiliation
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The Nb doping of Li[Ni0.855Co0.13Al0.015]O2 (NCA85) modifies its primary particle morphology to allow precise tailoring of its microstructure. The Nb dopant (1 mol%) elongates the primary particles and aligns them in the radial direction, creating a configuration that effectively dissipates the abrupt internal strain caused by H2↔H3 phase transitions near the charge end. The negation of the internal strain substantially improves the long-term cycling stability achieved by the Nb-doped NCA85 cathode; it retains 90% of its initial capacity after 1000 cycles while an undoped cathode retains 57.3%. Moreover, the enhanced mechano-chemical stability of the Nb-doped NCA85 cathode enables fast charging; accordingly, the Nb-doped NCA85 cathode cycles stably for 500 cycles even when charged at 3 C (full charge is achieved in 20 min). The Nb-doped cathode also demonstrates enhanced chemical and structural stability during calendar aging and under thermal load. The simple strategy of introducing Nb ions during the lithiation of NCA85, proposed in this paper, represents an effective solution that guarantees sufficient battery life, fast charging, and safety without compromising battery capacity for next-generation electric vehicles.
中文翻译:
用于电动汽车电池的微结构工程富镍层状阴极
Li[Ni 0.855 Co 0.13 Al 0.015 ]O 2的Nb掺杂(NCA85) 修改其初级粒子形态,以允许对其微观结构进行精确定制。Nb 掺杂剂 (1 mol%) 拉长了初级粒子并使它们沿径向排列,从而形成一种配置,可有效消散由电荷末端附近的 H2↔H3 相变引起的突然内部应变。内部应变的消除显着提高了 Nb 掺杂 NCA85 阴极实现的长期循环稳定性;它在 1000 次循环后仍保留其初始容量的 90%,而未掺杂的阴极保留 57.3%。此外,Nb 掺杂 NCA85 正极增强的机械化学稳定性可实现快速充电;因此,Nb 掺杂的 NCA85 阴极即使在 3 C 下充电时也能稳定循环 500 次(在 20 分钟内实现完全充电)。Nb 掺杂的阴极在日历老化和热负荷下也表现出增强的化学和结构稳定性。本文提出的在 NCA85 锂化过程中引入 Nb 离子的简单策略是一种有效的解决方案,可在不影响下一代电动汽车电池容量的情况下保证足够的电池寿命、快速充电和安全性。
更新日期:2021-07-08
中文翻译:
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用于电动汽车电池的微结构工程富镍层状阴极
Li[Ni 0.855 Co 0.13 Al 0.015 ]O 2的Nb掺杂(NCA85) 修改其初级粒子形态,以允许对其微观结构进行精确定制。Nb 掺杂剂 (1 mol%) 拉长了初级粒子并使它们沿径向排列,从而形成一种配置,可有效消散由电荷末端附近的 H2↔H3 相变引起的突然内部应变。内部应变的消除显着提高了 Nb 掺杂 NCA85 阴极实现的长期循环稳定性;它在 1000 次循环后仍保留其初始容量的 90%,而未掺杂的阴极保留 57.3%。此外,Nb 掺杂 NCA85 正极增强的机械化学稳定性可实现快速充电;因此,Nb 掺杂的 NCA85 阴极即使在 3 C 下充电时也能稳定循环 500 次(在 20 分钟内实现完全充电)。Nb 掺杂的阴极在日历老化和热负荷下也表现出增强的化学和结构稳定性。本文提出的在 NCA85 锂化过程中引入 Nb 离子的简单策略是一种有效的解决方案,可在不影响下一代电动汽车电池容量的情况下保证足够的电池寿命、快速充电和安全性。