Automatic lithium battery peeling

With further lithiation, the interfacial peeling strength increases dramatically. During the initial delithiation, the interfacial peeling strength decreases dramatically and then decreases slowly. Based on the analytical model, this phenomenon can be ascribed to the change in the strain energy stored in the current collector.

The mechanics of the common peeling tests have been well studied. An equilibrium theory to determine the energy release rate between elastic solids was developed by Kendall [19, 20]. Based on two quite different approaches, Gent and coworkers [21, 22] investigated the dependence of the peel force on the peeling angle.

As illustrated in Fig. 3, the peeling strength increases linearly with the energy release rate. The reason is as follows: Based on the energy balance approach, the larger the energy release rate is, the larger the peeling force is, which corresponds to a larger peeling strength, needed to break the interface.

Case 1: The peeling test is conducted at a zero-degree peeling angle and the strain energy stored in the current collector is not taken into consideration. According to Eq. (3), we can easily find that the displacement in the direction of the peeling force decreases as the peeling angle decreases.

The interfacial peeling strength of the graphite electrode as a function of the SOC This Li stiffening effect on the Young's modulus of the active layer for the graphite electrode coincides with Qi et al.'s result calculated by first-principles density functional theory . Introducing Eq. (14) into Eq.

Based on the energy balance approach, breaking the interface between the active layer and current collector requires a large peeling force. As a result, the interfacial peeling strength increases as the peeling angle decreases. For a large peeling angle, the interfacial peeling strength is small. We can neglect the second part of Eq. (8).