Analysis and prediction of the open circuit potential of lithium-ion cells

作者：Schmidt Jan Philipp^*; Hai Yen Tran; Richter Jan; Ivers Tiffee Ellen; Wohlfahrt Mehrens Margret

来源：Journal of Power Sources, 2013, 239: 696-704.

DOI：10.1016/j.jpowsour.2012.11.101

• Lithium-ion
• Open circuit potential
• Model
• Diagnosis
• Blend
• Analysis

A model is presented, which allows quantitative analysis as well as prediction of the open circuit potential of lithium-ion cells. Furthermore, the model determines half-cell potentials of already stressed lithium-ion cells, using a data set accomplished just once from half-cell potentials of a new reference cell. Its capability to describe thereby two relevant degradation processes, namely, (i) loss of active mass, and, (ii) loss of active lithium, is experimentally verified on a LiNi0.8Co0.15Al0.05O2 (NCA)/LiCoO2 (LCO) blend cell. %26lt;br%26gt;A further extension of the model allows the prediction of the open circuit potential of a blend cathode with various blend ratios as well as the analysis of unknown blend ratios. This ability is experimentally verified for cathodes made of LiNi0.8Co0.15Al0.05O2 (NCA)/LiMn2O4 (LMO) blends.

• 出版日期2013-10-1