In situ stress measurements during electrochemical cycling of lithium-rich cathodes

Nation, Leah; Li, Juchuan; James, Christine; Qi, Yue; Dudney, Nancy J.; Sheldon, Brian W.

doi:10.1016/j.jpowsour.2017.08.006

Cited by 21 publications

(17 citation statements)

References 48 publications

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“…This ultimately leads to further accelerated degradation phenomena. At first, the volume change induces stress in the secondary particles, leading to cracks between the primary particles, i.e., intergranular cracking ( Figure 9) [81,82]. As a consequence, capacity fading occurs, which is linked to the detachment of primary particles from the secondary particle matrix [83].…”

Section: Micro Cracking Of Secondary Particle Structurementioning

confidence: 99%

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

et al. 2020

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Driven by the increasing plea for greener transportation and efficient integration of renewable energy sources, Ni-rich metal layered oxides, namely NMC, Li [Ni1−x−yCoyMnz] O2 (x + y ≤ 0.4), and NCA, Li [Ni1−x−yCoxAly] O2, cathode materials have garnered huge attention for the development of Next-Generation lithium-ion batteries (LIBs). The impetus behind such huge celebrity includes their higher capacity and cost effectiveness when compared to the-state-of-the-art LiCoO2 (LCO) and other low Ni content NMC versions. However, despite all the beneficial attributes, the large-scale deployment of Ni-rich NMC based LIBs poses a technical challenge due to less stability of the cathode/electrolyte interphase (CEI) and diverse degradation processes that are associated with electrolyte decomposition, transition metal cation dissolution, cation–mixing, oxygen release reaction etc. Here, the potential degradation routes, recent efforts and enabling strategies for mitigating the core challenges of Ni-rich NMC cathode materials are presented and assessed. In the end, the review shed light on the perspectives for the future research directions of Ni-rich cathode materials.

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Section: Micro Cracking Of Secondary Particle Structurementioning

confidence: 99%

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

et al. 2020

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“…Initial delithiation of Li 1.2 Mn 0.55 Ni 0.125 Co 0.125 O 2 quickly introduced a buildup of in‐plain tensile stress in the first cycle. Then, it experienced an anomalous drop and became compressive upon full delithiation . The first cycle anomalous stress drop has also been reported for LiMn 2 O 4 , being ascribed to electrochemical reaction‐triggered structural changes such as oxygen loss and cation reordering.…”

Section: Stress Development In the Asslibsmentioning

confidence: 66%

“…Energy Mater. [329] The first cycle anomalous stress drop has also been reported for LiMn 2 O 4 , [330] being ascribed to electrochemical reaction-triggered structural changes such as oxygen loss and cation reordering. Reproduced with permission.…”

Section: Multibeam Optical Stress Sensor (Moss) Techniquementioning

confidence: 87%

“…Note that the in-plain strain within the film can be given as follows: Δε = Δσ/Y + Δε* (Equation (4)), in which σ is the biaxial film-stress while Y is the biaxial filmmodulus. [329] Copyright 2017, Elsevier. Because the substrate constraint Δε is equal to zero, the biaxial film-modulus Y as a function of the lithiation/delithiation degree can be then described through Y = −Δσ/Δε*, in which Δσ and Δε* are calculated from Equations (1) and (5), respectively.…”

Section: Multibeam Optical Stress Sensor (Moss) Techniquementioning

confidence: 99%

“…e) Plots of potential versus Li/Li + and normal stress as a function of time upon delithiation/lithiation of Li 1.2 Mn 0.55 Ni 0.125 Co 0.125 O 2 for the first two cycles (potential: 2.5–4.8 V, current density: 50 µA). Reproduced with permission . Copyright 2017, Elsevier.…”

Section: Stress Development In the Asslibsmentioning

confidence: 99%

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Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Liu

et al. 2019

Advanced Energy Materials

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The continuous depletion of fossil fuels, the increase of oil prices, and the need to decrease CO 2 emissions have stimulated intensive research on developing alternative renewable and clean energy sources. [1] Among these alternative energy sources, rechargeable Li-ion batteries (LIBs) are one of the promising candidates. To date, the LIBs basically consisting of a positive electrode (cathode), an electrolyte, and a negative electrode (anode) have widespread applications, such as portable electronic devices, pure electric vehicles (PEVs), and hybrid electric vehicles (HEVs). [2] The state-of-the-art electrolytes are usually the lithium salts (LiPF 6 , LiBF 4 , and LiCF 3 SO 3 ) dissolved in organic solvents, i.e., ethylene carbonate, propylene carbonate, polyethylene oxide, and dimethyl carbonate, [3] which exhibit excellent wetting of the electrodes and produce a fast transfer of Li + ions upon charging and discharging. However, they suffer from flammability, poor electrochemical stability, limited temperature range of operation, and low power density. [4] There is an ever-increasing demand for batteries with a higher energy and power density, although current LIBs offer volumetric and gravimetric energy densities up to 770 Wh L −1 and 260 Wh kg −1 , respectively. [5] To improve the energy/power density of LIBs, one way is to adopt high-potential cathode materials such as LiNi 0.5 Mn 1.5 O 4 (LNMO). The high-voltage plateau of LNMO (≈4.7 V vs Li/Li + ) makes its energy density 20-30% higher than the energy density of commercial LiCoO 2 and LiFePO 4 . [6] However, successful commercialization of the LNMO is restricted in high-energy LIBs due to electrolyte decomposition and side reaction of the cathodes and liquid electrolytes when operating at high voltages. [7,8] The other way to improve the energy/power density is to replace the conventional graphite anode with Li metal. The Li metal, with a low anode potential (−3.04 V vs standard hydrogen electrode) and high specific capacity (3862 mAh g −1 for the Li anode versus 372 mAh g −1 for the graphite anode), [9][10][11] has been considered as the "Holy Grail" of battery technologies. When paired with sulfur and oxygen, the theoretical energy density of Li-S (≈2567 Wh kg −1 ) and Li-O 2 (≈3505 Wh kg −1 ) batteries is far higher than the theoretical energy density of conventional LIBs (≈387 Wh kg −1 ). [12][13][14][15] When Li metal approaches the liquid electrolytes, however, unstable Li/electrolyte interface Rechargeable Li-ion batteries (LIBs) are electrochemical storage device widely applied in electric vehicles, mobile electronic devices, etc. However, traditional LIBs containing liquid electrolytes suffer from flammability, poor electrochemical stability, and limited operational temperature range. Replacement of the liquid electrolytes with inorganic solid-state electrolytes (SSEs) would solve this problem. However, several critical issues, such as poor interfacial compatibility, low ionic conductivity at ambient temperatures, etc., need to be surmounted befor...

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Correlation between Surface Reactions and Electrochemical Performance of Al₂O₃‐ and CeO₂‐Coated NCM Thin Film Cathodes

Hemmelmann

Rueß

Klement

et al. 2023

Adv Materials Inter

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Depositing ultrathin oxide coatings has been proven a successful approach to stabilize the surface of LiNixCoyMnzO2 active cathode material in lithium‐ion batteries (LIB). The beneficial effect of Al2O3 coatings arises at least partly from spontaneous reactions between coating and liquid electrolyte. However, it remains unclear if comparable surface reactions occur for other oxide coatings. One difficulty is the characterization of reaction products at the cathode–electrolyte interface due to the multi‐phase properties of composite cathodes. Here, thin films are utilized as model systems to correlate surface reactions with the performance of Al2O3‐ and CeO2‐coated nickel cobalt manganese oxides (NCM). Electrochemical characterization confirms that an Al2O3 coating improves long‐term cycling stability, while CeO2‐coated thin films perform even worse than uncoated counterparts. The analysis of the surface reaction products using X‐ray photoelectron spectroscopy shows that both coatings are fluorinated upon contact with liquid electrolyte in agreement with thermodynamic considerations. The fluorinated Al2O3 coating is stable during cycling, resulting in the improved cell performance. In contrast, the fluorinated CeO2 coating changes chemical composition, facilitating corrosion of the NCM surface. The results demonstrate the importance of a detailed analysis of surface reactions to evaluate the suitability of ultrathin oxide layers as protective coatings for LIBs.

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In situ stress measurements during electrochemical cycling of lithium-rich cathodes

Cited by 21 publications

References 48 publications

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Correlation between Surface Reactions and Electrochemical Performance of Al₂O₃‐ and CeO₂‐Coated NCM Thin Film Cathodes

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In situ stress measurements during electrochemical cycling of lithium-rich cathodes

Cited by 21 publications

References 48 publications

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

Degradation and Aging Routes of Ni-Rich Cathode Based Li-Ion Batteries

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Correlation between Surface Reactions and Electrochemical Performance of Al2O3‐ and CeO2‐Coated NCM Thin Film Cathodes

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Product

Resources

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Correlation between Surface Reactions and Electrochemical Performance of Al₂O₃‐ and CeO₂‐Coated NCM Thin Film Cathodes