锂离子电池用微米厚度超薄集流体Cu箔和Al箔疲劳强度及损伤行为

程福来, 罗雪梅, 胡炳利, 张滨, 张广平

Fatigue Strength and Damage Behavior of Micron-Thick Ultrathin Current Collector Cu Foil and Al Foil for Lithium-Ion Battery

CHENG Fulai, LUO Xuemei, HU Bingli, ZHANG Bin, ZHANG Guangping

图3 8 μm厚Cu箔高周疲劳试样在应力幅92 MPa、总寿命为4 × 106 cyc下的损伤萌生位点微观结构以及损伤特征

Fig.3 Microstructures and damage features of fatigue damage initiation sites in 8 μm-thick Cu foils under a stress amplitude of 92 MPa and fatigue life of 4 × 106 cyc (The arrows in Figs.4a-c represent fatigue damage sites. Black and white lines in Figs.4b and c are grain boundaries and twin boundaries, respectively) (a) SEM image (LD—loading direction) (b) EBSD grain orientation map (ND—normal direction) (c) Schmid factor map (d) post-fatigue TEM image (e, f) inverse pole figures depicting the orientations of parent and twin grains associated with the fatigue damage in the surface ND (e) and LD (f), respectively