How does stack pressure affect solid-state batteries?

Sakka et al. used X-ray computer tomography to study the effect of the stack pressure on solid-state batteries. They found that increased stack pressure reduced the porosity, but enhanced the contact between solid electrolyte and electrode, which decreases charge transfer resistance and conductivity.

Why is external stack pressure important for lithium-based rechargeable batteries?

On the other hand, the external stack pressure is also inevitable for lithium-based rechargeable batteries, extensively occurring during manufacturing and time of operation and can be either beneficial or detrimental to the battery performance.

How does stack pressure affect a battery holder?

Stack pressure is applied to join the battery components together properly in battery holders (Fig. 1b). The method of applying external pressure directly affects the material structure and properties.

Does external pressure affect battery performance?

The studies reviewed in the text show interesting results where external pressure affects capacity, internal resistance, stability or other parameters of modern battery systems as Li-ion, solid-state, or Li–S batteries.

How does stack pressure affect the resistance of a cell?

The results show an optimal pressure to minimise separator resistivity from 0.1–0.6 MPa, and an increasing relationship between the electrode resistances and pressure. At the cell level, stack pressure increased the charge transfer resistance but decreased the high frequency resistance.

How does a solid-state battery affect local stress?

In solid-state batteries, the higher external pressure and stiffer solid-state electrolyte (SSE) will induce higher local stress in AMs and more likely the growth of cracks within the particle.