Professor Huang Jiaqi and Assistant Professor Zhang Xueqiang of the Institute of Advanced Interdisciplinary Sciences of Beijing Institute of TechnologyNano Research EnergyA review entitled “Mechanism, quantitative characterization, and inhibition of corrosion in lithium batteries” was published.
In order to achieve the dual carbon goal, continuous development is necessaryHigh energy density, low cost, long lifeLithium batteries are used as power units for portable consumer electronics and electric vehicles. However, due to the presence of a variety of chemical materials inside the battery, corrosion reactions are difficult to avoid.Corrosion will lead to the loss of active materials and electrolyte, destroy battery stability, and severely reduce battery life。 Therefore, understand the corrosion that occursLocation, mechanismcombineDevelop strategies to suppress corrosionIt is essential for the development of lithium batteries.
Figure 1: Schematic diagram of the main corrosion reactions of lithium batteries, including 1) aluminum current collector, 2) lithium metal and 3) corrosion of stainless steel.
Lithium batteries mainly include 3 kinds of corrosion, which areElectrochemical corrosion of aluminum current collectors and stainless steelandGalvanic corrosion of lithium metal。 Aluminum current collectors and corrosion of stainless steel areAluminum and stainless steel chemically react with the electrolyte, causing pitting and accelerating battery failure。 Galvanic corrosion of lithium metal is due toThe contact between lithium and copper current collector forms an galvanic pair, resulting in the oxidation of lithium and the reduction of electrolyte on the copper surface。 In order to explore the corrosion mechanism and evaluate the effectiveness of suppression strategies, several types are introduced in this paperMethods for quantifying corrosion reactions, mainly for the quantitative analysis of lithium loss, respectivelyIn situ X-ray diffraction, in situ NMR, titration gas chromatographyandDifferential scanning calorimetry。 Then, the strategies for suppressing corrosion on the positive and negative sides are summarized. In order to suppress the corrosion of the positive electrode, especially the aluminum current collector,Optimization of electrolytes and surface treatment of aluminum current collectorsare two conventional methods. For the suppression of lithium corrosion on the negative side,Protect lithium metal from external environmental influencesSurface coating and bulk phase or grain boundary doping to reduce solid-liquid interface reaction kinetics are two viable strategies. Finally, this paper prospects the challenges and space in the corrosion research of lithium batteries from the aspects of the effectiveness of corrosion suppression strategies under practical conditions, the establishment of corrosion reaction acceleration evaluation methods, the suppression of galvanic corrosion, and the corrosion research in new system batteries.
Related paper information:
Wang Y-Y, Zhang X-Q, Zhou M-Y, et al. Mechanism, quantitative characterization, and inhibition of corrosion in lithium batteries. Nano Research Energy, 2022, https://doi.org/10.26599/NRE.2023.9120046
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