Chemomechanical interplay of layered cathode materials undergoing fast charging in lithium batteries

Xia, Sihao; Mu, Linqin; Xu, Zhengrui; Wang, Jun-Yang; Wei, Chenxi; Liu, Lei; Pianetta, P.; Zhao, Kejie; Yu, Xiqian; Lin, Feng; Liu, Yijin

doi:10.1016/j.nanoen.2018.09.051

Cited by 206 publications

(197 citation statements)

References 43 publications

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“…All observable diffraction peaks can be attributed to the layered hexagonal structure of α‐NaFeO 2 , belonging to the space group Rm. The splitting of the different (006)/(012) and (018)/(110) peaks suggests that these oxides have a well‐developed layered structure . The XRD pattern of the modified material did not change significantly because the coating amount of LiF was small, the coating layer was thin, and LiF existed in an amorphous state.…”

Section: Resultsmentioning

confidence: 99%

“…The splitting of the different (006)/(012) and (018)/(110) peaks suggests that these oxides have a well-developed layered structure. [22,46,47] The XRD pattern of the modified material did not change significantly because the coating amount of LiF was small, the coating layer was thin, and LiF existed in an amorphous state. The above analysis demonstrates that the coating material does not enter the crystal lattice, and only the coating layer is formed on the surface, which TEM tests further confirmed.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced High‐Temperature Electrochemical Performance of Layered Nickel‐Rich Cathodes for Lithium‐Ion Batteries after LiF Surface Modification

Huang

Peng

et al. 2019

ChemElectroChem

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Layered nickel (Ni)-rich materials have been widely studied as attractive cathode materials for lithium-ion batteries, owing to their high theoretical specific capacity and low cost; however, most Ni-rich materials have poor cycle performance, especially at high temperatures. This study reports a simple sol-gel method for developing lithium fluoride (LiF)-coated Li-Ni 0.90 Co 0.08 Al 0.02 O 2 (NCA@LiF) by immersing NCA powder in a 1butyl-2,3-dimethylimidazolium tetrafluoroborate (BdmimBF 4 ) solution. The residual Li compound on the surface of NCA can be converted into a uniform LiF coating layer through the in situ hydrolysis of BdmimBF 4 . The Li-conducting LiF coating layer inhibits side reactions (LiPF 6 !PF 5 + LiF, PF 5 + H 2 O!POF 3 + HF, POF 3 + Li 2 O!Li x POF y + LiF, Li 2 O/LiOH + HF!H 2 O + 2LiF) with the electrolyte and protects the electrode from HF corrosion. The NCA@LiF sample shows a high capacity retention rate of 79.9 % after 200 cycles at 1 C and an excellent capacity of 155.7 mAh g À 1 at 10 C at room temperature. Additionally, the capacity retention rate of the NCA@LiF sample at high temperatures exhibited a significant improvement in comparison with the NCA sample, reaching 75.7 % after 100 cycles at 60°C at 1 C. This simple and effective method can be used for improving the electrochemistry stability and high-temperature performance of other Ni-based cathode materials.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Enhanced High‐Temperature Electrochemical Performance of Layered Nickel‐Rich Cathodes for Lithium‐Ion Batteries after LiF Surface Modification

Huang

Peng

et al. 2019

ChemElectroChem

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“…The critical particle size under which fracture will not propagate has been estimated and experimentally confirmed for many LCMs and olivine structured particles. Using synchrotron X-ray tomography, Xia et al [9] showed that the degree of fracture has a positive relationship with the size of LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC622) secondary particles, as can be observed in figure 17. The particles with larger diameters have wider and longer cracks throughout the entire cross section of the particles.…”

Section: Cathode Materialsmentioning

confidence: 98%

“…State-of-charge heterogeneity on a cathode accelerates crack formation. State-of-charge heterogeneity is defined as heterogeneous distribution of the oxidation state of a transition metal element on a cathode at multiple length scales, ranging from secondary particles to electrodes [9,16,[88][89][90]. Chemical outliers exist on nickel-rich layered secondary particles at the discharge state, which means the oxidation state of Ni is more reduced on the surface of particles, while it is more oxidized in the bulk [91].…”

Section: Cathode Materialsmentioning

confidence: 99%

“…Both experimental and computational methods have been utilized to study battery material fracture. Electron microscopy and X-ray tomography are commonly used to directly observe the initiation and propagation of cracks under different cycling conditions [9][10][11][12][13]. These imaging results shed light on the critical cycling conditions and particle morphology that affect the degree of fracture.…”

Section: Introductionmentioning

confidence: 99%

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Fracture behavior in battery materials

Zhao

Shen

et al. 2020

J. Phys. Energy

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The fracture of battery materials is one of the main causes of battery degradation. This issue is further amplified in emerging solid-state batteries, where the more robust interface between the liquid electrolyte and solid electrode in conventional batteries is replaced by a brittle solid-solid interface. In this review, we summarize the observed fracture behavior in battery materials, the origin of fracture initiation and propagation, as well as the factors that affect the fracture processes of battery materials. Both experimental and modeling analyses are presented. Finally, future developments regarding the quantification of fracture, the interplay of chemo-mechanical factors, and battery lifespan design are discussed along with a proposed theoretical framework, in analogy to fatigue damage, to better understand battery material fracture upon extended cycling.

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