Understanding metal propagation in solid electrolytes due to mixed ionic-electronic conduction

Abstract

Internal Li deposition in isolated pores inside the solid electrolyte (SE) is found to be one of the main reasons for dendrites growth (short) in solid-state batteries, due to the presence of electronic conductivity of the SE. In this work we show for the first time a clear picture of how this happens and what the controlling factors are. We also propose several solutions to reduce/eliminate the dendrites growth caused by internal deposition.

Hydrogen bonding enhanced SiO2/PEO composite electrolytes for solid-state lithium batteries

“…S4†), which might be essential for suppressing the lithium dendrite formation during cycling. 48,49 Analogously, the Nyquist spectra of 5I, 15I, and 20I recorded at various temperatures from 25 to 80 °C are presented in Fig. S5 †.…”

An Investigation of Chemo‐Mechanical Phenomena and Li Metal Penetration in All‐Solid‐State Lithium Metal Batteries Using In Situ Optical Curvature Measurements

“…The electrochemical conditions at this interface were also coupled with a model of ionic conduction through the SE. [ 58 ] Mechanical contact between the SE and interphase was modeled with lower‐dimensional mortar elements and the displacements in all dimensions were set to be equal across the interface, mimicking perfectly bonded contact. Along the symmetry line, displacements were assumed to be zero in the radial direction and free in the z direction.…”

Vertically Heterostructured Solid Electrolytes for Lithium Metal Batteries

“…Rationalizing the correlation of SSEs homogeneity, constrain effects and electronic conductivity can effectively sustain the integrality of the SSEs as the pressure within the SSEs increases. [ 30 ] To ensure a dendrite‐free operation of the ASSBs, the threshold of the SSE electronic conductivity is estimated to be below ≈10 −10 –10 −12 S cm −1 . [ 26 ] LATP, a NASICON‐type SSE with a remarkable electronic conductivity (>10 −8 S cm −1 ), seems to be an exception, rather than meeting the bulk criterion of an excessively low electronic conductivity.…”