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overdischarge-induced evolution of Cu dendrites and degradation of mechanical properties in lithium-ion batteries

Journal of Energy Chemistry 2023年第3期78卷 497-506,I0014页

作者： Zixin Guo Siguo Yang Wenyang Zhao Shenghui Wang Jiong Liu Zhichao Ma Hongwei Zhao Luquan Ren Key Laboratory of CNC Equipment Reliability Ministry of EducationJilin UniversityChangchun 130025JilinChina School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130015JilinChina Key Laboratory of Bionic Engineering Ministry of Education Jilin UniversityChangchun 130025JilinChina Weihai Institute for Bionics-Jilin University Weihai 264400ShandongChina

The degradation of mechanical properties of overdischarge battery materials manifests as a significant effect on the energy density,safety,and cycle life of the ***,establishing the correlation between depth of overdischarge and mechanical properties is still a significant *** the correlation between depth of overdischarge and mechanical properties is of great significance to improving the energy density and the ability to resist abuse of the *** this paper,the mechanical properties of the battery materials during the whole process of overdischarge from discharge to complete failure were *** effects of depth of overdischarge on the elastic modulus and hardness of the cathode of the battery,the tensile strength and the thermal shrinkage rate of the separator,and the performance of binder were *** precipitation of Cu dendrites on the separator and cathode after dissolution of anode copper foil is a key factor affecting the performance of battery *** Cu dendrites attached to the cathode penetrate the separator,causing irreversible damage to the coating and base film of the separator,which leads to a sharp decline in the tensile strength,thermal shrinkage rate and other properties of the *** addition,the Cu dendrites wrapping the cathode active particles reduce the adhesion of the active particles ***,the active particles are damaged,resulting in a significant decrease in the elastic modulus and hardness of the cathode.

关键词： overdischarge Cu dendrites Mechanical properties Nanoindentation Micron scratch

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Study on Degradation and Recovery of AB_5-Type Hydrogen Storage Alloy Used in Ni-MH Batteries

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Journal of Rare Earths 2002年第3期20卷 213-217页

作者：王荣阎杰周震周作祥邓斌高学平 Institute of New Energy Material Chemistry Nankai University Tianjin 300071 China

The influences of deeply overdischarge on the negative electrode alloy of Ni/MH battery were studied. After overdischarge, La(OH) 3 and Al(OH) 3 are found to form in the negative electrode through XRD analysis. The hydrogen storage alloy powder from spent Ni/MH batteries was recovered by chemical and melting method according to degradation mechanism. The structure of recovered alloy was measured by XRD. The experimental results demonstrate that the alloy structure is CaCu 5 type. The constant current charge/discharge test was carried out to the original alloy and the recovered alloy. It is found that their discharge capacities are almost the same, but the discharge potential of the recovered alloy is higher than that of the original alloy. The results of cyclic lifetime test demonstrate that the capacity degradation of the recovered alloy is slower than that of the original one.

关键词： rare earths Ni/MH battery overdischarge hydrogen storage alloy recovery

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