Structural Transformation of LiNi0.8Co0.1Mn0.1O2 Cathode Material During Cycling with Overcharge Investigated by in situ X-ray Diffraction

This article presents a study of cathode material LiNi 0.8 Co 0.1 Mn 0.1 O 2 using continuous in situ x-ray diffractometry during cycling of a rechargeable cell in the range of 2.7 V to 4.8 V. Changes in the crystal structure LiNi 0.8 Co 0.1 Mn 0.1 O 2 during charge–discharge were studied. Capacitance drop due to degradation, and dependence parameters of the material unit cell on the voltage are shown. The causes of irreversible structural degradation of the cathode material during intercalation and deintercalation of lithium ions were investigated. Results of our work can help to find a possible solution to decrease the degradation factors by understanding the degradation mechanism.