Cycle parameter dependent degradation analysis in automotive lithium-ion cells

Storch, Mathias; Fath, Johannes Philipp; Sieg, Johannes; Vranković, Dragoljub; Mullaliu, Angelo; Krupp, Carsten; Spier, Bernd; Passerini, Stefano; Riedel, Ralf

doi:10.1016/j.jpowsour.2021.230227

Cited by 8 publications

(3 citation statements)

References 59 publications

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“…The degree of cation mixing can also be qualitatively determined by observing the ratio of the (003) and (104) reflections. 49,50 The difference of the peak ratio determined for the charged samples is presented in Figure 4F, supporting a higher cation mixing in the LP30 sample, which eventually causes the structural degradation of the NCM83 cathode. 51 Further results of the Rietveld refinement, including the refined lattice and atomic parameters, can be found in Tables S1-S3.…”

Section: Resultsmentioning

confidence: 81%

“…However, the electrode in contact with neat LP30 showed a much higher cation mixing than the one cycled in the presence of LiBOB (0.16 Ni 3a for LP30 vs. 0.11 Ni 3a for LiBOB; see also Table S1–S3). The degree of cation mixing can also be qualitatively determined by observing the ratio of the ( 003 ) and ( 104 ) reflections 49,50 . The difference of the peak ratio determined for the charged samples is presented in Figure 4F, supporting a higher cation mixing in the LP30 sample, which eventually causes the structural degradation of the NCM83 cathode 51 .…”

Section: Resultsmentioning

confidence: 84%

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Beneficial impact of lithium bis(oxalato)borate as electrolyte additive for high‐voltage nickel‐rich lithium‐battery cathodes

Mullaliu

Diemant

et al. 2023

InfoMat

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High‐voltage nickel‐rich layered cathodes possess the requisite, such as excellent discharge capacity and high energy density, to realize lithium batteries with higher energy density. However, such materials suffer from structural and interfacial instability at high voltages (>4.3 V). To reinforce the stability of these cathode materials at elevated voltages, lithium borate salts are investigated as electrolyte additives to generate a superior cathode‐electrolyte interphase. Specifically, the use of lithium bis(oxalato)borate (LiBOB) leads to an enhanced cycling stability with a capacity retention of 81.7%. Importantly, almost no voltage hysteresis is detected after 200 cycles at 1C. This outstanding electrochemical performance is attributed to an enhanced structural and interfacial stability, which is attained by suppressing the generation of micro‐cracks and the superficial structural degradation upon cycling. The improved stability stems from the formation of a fortified borate‐containing interphase which protects the highly reactive cathode from parasitic reactions with the electrolyte. Finally, the decomposition process of LiBOB and the possible adsorption routes to the cathode surface are deduced and elucidated.image

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Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 84%

Beneficial impact of lithium bis(oxalato)borate as electrolyte additive for high‐voltage nickel‐rich lithium‐battery cathodes

Mullaliu

Diemant

et al. 2023

InfoMat

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“…This phenomenon is attributable to the depth of discharge (DOD) and is closely related to the battery charging/discharging rate. The polarization effect inside the battery is more severe at high current densities, and there is limited diffusion and transition of Li + , resulting in part of the active material participating in the charging and discharging process. − After 50 cycles, the discharge capacity of 1C–2C is significantly lower than that of 1C–1C (Figure S1). This confirms the 1C–2C battery carries out cyclic aging in a low DOD and has a longer cycle life than 1C–1C.…”

Section: Resultsmentioning

confidence: 99%

Failure of Lithium-Ion Batteries Accelerated by Gravity

Hao,

Li,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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The safety concerns surrounding lithium-ion batteries (LIBs) have garnered increasing attention due to their potential to endanger lives and incur significant financial losses. However, the origins of battery failures are diverse, presenting significant challenges in developing safety measures to mitigate accidental catastrophes. In this study, the aging mechanism of LiNi 0.5 Co 0.2 Mn 0.3 O 2 ||graphitebased cylindrical 18,650 LIBs stored at room temperature for two years was investigated. It was found that an uneven distribution of electrolytes can be caused by gravity, leading to temperature variations within the battery. Specifically, it was observed that the temperature at the top of the battery was approximately −0.89 °C higher than at the bottom, correlating with an increase in partial internal resistance. Additionally, upon disassembly and analysis of spent batteries, the most significant damage to electrode materials at the top of the battery was observed. These findings suggest that gravity-induced electrolyte insufficiency exacerbates side reactions, particularly at the top of the battery. This study offers a unique perspective on the safety concerns associated with high-energydensity batteries in long-term and large-scale applications.

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