Microscopic investigation of crack and strain of LiCoO2 cathode cycled under high voltage

Zhu，Yuanmin1,2; Wu，Duojie2; Yang，Xuming3; Zeng，Leiying4; Zhang，Jian4; Chen，Deliang1; Wang，Biao1; Gu，Meng2

2023-06-01

10.1016/j.ensm.2023.102828

Energy Storage Materials   影响因子和分区

2405-8297

2405-8297

The structural stability of LiCoO at high voltages is especially important when enhancing the cutoff voltage used as an effective method to boost the energy density. we trace the origin of different crack formation mechanisms during fast and slow charging rates using a combination of qualitative atomic-scale differential phase-contrast scanning transmission electron microscope (STEM) images and electron energy loss spectroscopy (EELS) analysis of LiCoO (LCO). We demonstrate that fast charging induces large heterogenous Li flux insertion into the cathode, resulting in large strain and big crack formation; in contrast, low cycling rates trigger phase transformations that only induce micro-cracks. To clarify the mechanisms, we mapped out local strain analysis for the LCO particles and detailed phase transition routes. The comprehensive characterization results are meaningful for researchers to understand the failure mechanisms under high voltage and inspire innovative solutions to capture higher capacity out of LCO.

Crack LiCoO2 Micro-strain Oxygen loss Phase transformation

SCI ; EI

英语

通讯

National Natural Science Foundation of China[12004156];Tip-top Scientific and Technical Innovative Youth Talents of Guangdong Special Support Program[2019QN01L057];Guangdong Innovative and Entrepreneurial Research Team Program[2019ZT08C044];National Natural Science Foundation of China[52273225];Shenzhen Fundamental Research and Discipline Layout project[JCYJ20200109141216566];Shenzhen Fundamental Research and Discipline Layout project[JCYJ20210324115809026];Shenzhen Fundamental Research and Discipline Layout project[JCYJ20220818100212027];Shenzhen Science and Technology Innovation Program[KQTD20190929173815000];

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001015686400001

ELSEVIER

20232214169638

Cathodes ; Electron energy levels ; Electron energy loss spectroscopy ; Electron scattering ; Energy dissipation ; Failure (mechanical) ; Lithium compounds ; Oxygen ; Stability ; Transmission electron microscopy

Energy Losses (industrial and residential):525.4 ; Physical Chemistry:801.4 ; Chemical Products Generally:804

2-s2.0-85160404359

Scopus

1.Research Institute of Interdisciplinary Science & School of Materials Science and Engineering,Dongguan University of Technology,Dongguan,523808,China
2.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Graphene Composite Research Center,College of Chemistry and Environmental Engineering,Shenzhen University,Shenzhen,518060,China
4.XTC New Energy Materials (Xiamen) Co.,Ltd,Xiamen,361026,China

Zhu，Yuanmin,Wu，Duojie,Yang，Xuming,et al. Microscopic investigation of crack and strain of LiCoO2 cathode cycled under high voltage[J]. Energy Storage Materials,2023,60.

Zhu，Yuanmin.,Wu，Duojie.,Yang，Xuming.,Zeng，Leiying.,Zhang，Jian.,...&Gu，Meng.(2023).Microscopic investigation of crack and strain of LiCoO2 cathode cycled under high voltage.Energy Storage Materials,60.

Zhu，Yuanmin,et al."Microscopic investigation of crack and strain of LiCoO2 cathode cycled under high voltage".Energy Storage Materials 60(2023).