The multi-walled carbon nanotubes (MWCNTs) modified LiNi_0.5Mn_0.3Co_0.2O₂ (NMC532) electrodes were prepared by using blade-coated method. The corresponding microstructure morphology were observed by scanning microscopy electron. The impedance spectroscopy and cycle performances of the electrodes with different MWCNTs contents were measured and discussed. Tensile fracture measurements of the electrodes were performed with the aid of digital image correlation technique. The cracking nucleation and propagation on the active layer surface were in situ monitored. A modified shear lag model was developed to analyze the fracture strength, fracture energy and fracture toughness of the active layer during tensions. The effect of MWCNTs on tensile failure mechanisms of two-layered NMC532 electrodes was discussed. The proposed method is useful for appraising the mechanical properties of other advanced active layers in lithium ion batteries.

多壁碳纳米管修饰的LiNi _0.5 Mn _0.3 Co _0.2 O ₂（NMC532）电极采用刮涂法制备。通过扫描显微镜电子观察相应的微观结构形态。测量并讨论了不同碳纳米管含量的电极的阻抗谱和循环性能。借助于数字图像相关技术进行电极的拉伸断裂测量。活性层表面上的裂纹成核和扩展被原位监测。建立了改进的剪切滞后模型，以分析活性层在拉伸过程中的断裂强度，断裂能和断裂韧性。讨论了碳纳米管对两层NMC532电极拉伸破坏机理的影响。