Electrochemical Failure Results Inevitable Capacity Degradation in Li-Ion Batteries—A Review

Abstract

Lithium-ion batteries (LIBs) have been widely used in mobile devices, energy storage power stations, medical equipment, and other fields, became an indispensable technological product in modern society. However, the capacity degradation of LIBs limits their long-term deployment, which is not conducive to saving resources. What is more, it will lead to safety problems when the capacity of the battery is degraded. Failure of the battery is a key issue in the research and application of LIBs. Faced with the problem of capacity degradation, various aspects of LIBs have been studied. This paper reviews the electrochemical degradation mechanism of LIBs’ life fade, detection technologies for battery failure, methods to regulate battery capacity degradation, and battery lifetime prognostics. Finally, the development trend and potential challenges of battery capacity degradation research are prospected. All the key insights from this review are expected to advance the research on capacity fading and lifetime prediction techniques for LIBs.

Slug Flow Coprecipitation Synthesis of Uniformly-Sized Oxalate Precursor Microparticles for Improved Reproducibility and Tap Density of Li(Ni0.8Co0.1Mn0.1)O2 Cathode Materials

“…During the cycling process, the Coulombic efficiencies of the coated sample are higher than those of the baseline sample, particularly during the first 30 cycles, besides more scattered values for the baseline sample. The improvement in the electrochemical performance with coating is consistent with an earlier study and likely because the cathode particles are protected (to some extent) from side reactions (hampering Li + diffusion) and/or mechanical degradations , such as microcracking shown in Figure e.…”

“…The NCM811 particles also show microcracking after cycling (Figure d,e). Microcracking is not uncommon for high-Ni cathode materials and is likely due to nonuniform volume contraction and expansion during the charge–discharge cycling. ,− …”

ARWLS-AFEKE: SOC Estimation and Capacity Correction of Lithium Batteries Based on a Fusion Algorithm

“…Given the error caused by the SOC estimation algorithm and battery capacity that was regarded as constant, a modified fusion method with capacity correction is proposed, in which the initial SOC value of the battery is determined by open-circuit voltage and then corrected by correction factors that are related to the charge/discharge current, the Coulombic efficiency, and temperature, and obtained by the charge and discharge tests of the battery pack [22,23]. To accurately estimate the SOC during charging and discharging, the capacity correction of the fusion method should be defined as follows:…”