Microstructure Engineered Ni‐Rich Layered Cathode for Electric Vehicle Batteries

Advanced Energy Materials - Tập 11 Số 25 - 2021
Un‐Hyuck Kim1, Jeong‐Hyeon Park1, Assylzat Aishova1, Rogério M. Ribas2, Robson S. Monteiro2, Kent J. Griffith3, Chong Seung Yoon4, Yang‐Kook Sun1
1Department of Energy Engineering, Hanyang University, Seoul 04763, South Korea
2Companhia Brasileira de Metalurgia e Mineração (CBMM) Araxá Minas Gerais 38183‐903 Brazil
3Department of Chemistry and Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208 USA
4Department of Materials Science and Engineering, Hanyang University, Seoul, 04763, South Korea

Tóm tắt

AbstractThe 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.

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Advanced Energy Materials

Tập 11 Số 25

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