Investigation and Suppression of Oxygen Release by LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 Cathode under Overcharge Conditions

Shi Chen-Guang; Peng Xinxing; Dai PengXiao PenghaoZheng Wei-ChenLi Hong-YangLi HangIndris SylvioMangold StefanHong Yu-HaoLuo Chen-XuShen Chong-HengWei Yi-MinHuang LingSun Shi-Gang

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Investigation and Suppression of Oxygen Release by LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 Cathode under Overcharge Conditions

机译：Investigation and Suppression of Oxygen Release by LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 Cathode under Overcharge Conditions

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The safety issue of lithium-ion batteries is a crucial factor limiting their large-scale application. Therefore, it is of practical significance to evaluate the impact of their overcharge behavior because of the severe levels of oxygen release of cathode materials during this process. Herein, by combining a variety of in situ techniques of spectroscopy and electron microscopy, this work studies the structural degradation of LiNi0.8Co0.1Mn0.1O2 (NCM811) accompanying the oxygen release in the overcharge process. It is observed that a small amount of O-2 evolves from the initial surface at approximate to 4.7 V. When charging to a higher voltage (approximate to 5.5 V), a large amount of O-2 evolves on the newly formed surface due to the occurrence of microcracks. Based on experimental results and theoretical calculations, it is determined that the oxygen release mainly occurs in the near-surface regions, where the remaining oxygen vacancies accumulate to create voids. To suppress the oxygen release, single-crystalline NCM811 with integrated structure is introduced and serves as a cathode, which can effectively inhibit morphology destruction and reduce the activation of lattice oxygen in the surface region. These findings provide a theoretical basis and effective strategy for improving the safety performance of Ni-rich cathode materials in practical applications.

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《Advanced energy materials》 |2022年第20期|2200569.1-2200569.10|共10页
作者
Shi Chen-Guang; Peng Xinxing; Dai PengXiao PenghaoZheng Wei-ChenLi Hong-YangLi HangIndris SylvioMangold StefanHong Yu-HaoLuo Chen-XuShen Chong-HengWei Yi-MinHuang LingSun Shi-Gang;
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Xiamen Univ, Coll Chem & Chem Engn, Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Fujian, Peoples R China|Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA;

Xiamen Univ, Coll Chem & Chem Engn, Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Fujian, Peoples R China;

Dalhousie Univ, Dept Phys & Atmospher Sci, Halifax, NS B3H 4R2, CanadaKarlsruhe Inst Technol, Inst Appl Mat, D-76344 Eggenstein Leopoldshafen, GermanyKarlsruhe Inst Technol, Inst Photon Sci & Synchrotron Radiat, D-76344 Eggenstein Leopoldshafen, GermanyCtr Micronano Fabricat & Adv Characterizat, Tan Kah Kee Innovat Lab IKKEM, Xiamen 361100, Fujian, Peoples R ChinaContemporary Amperex Technol Co, Ningde 352100, Peoples R ChinaXiamen Univ, Coll Chem & Chem Engn, Collaborat Innovat Ctr Chem Energy Mat, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Fujian, Peoples R China|Karlsruhe Inst Technol, Inst Appl Mat, D-76344 Eggenstein Leopoldshafen, Germany;

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LiNi Co-0 8 Mn-0 1 O-0 1 (2); microcracks; overcharge; oxygen release; single crystalline; structural changes;

Investigation and Suppression of Oxygen Release by LiNi_(0.8)Co_(0.1)Mn_(0.1)O_2 Cathode under Overcharge Conditions

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