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High Active Material Loading in All‐Solid‐State Battery Electrode via Particle Size Optimization
Author(s) -
Shi Tan,
Tu Qingsong,
Tian Yaosen,
Xiao Yihan,
Miara Lincoln J.,
Koova Olga,
Ceder Gerbrand
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902881
Subject(s) - cathode , materials science , particle size , composite material , battery (electricity) , composite number , particle (ecology) , electrolyte , electrode , chemical engineering , electrical engineering , thermodynamics , power (physics) , oceanography , physics , chemistry , geology , engineering
Low active material loading in the composite electrode of all‐solid‐state batteries (SSBs) is one of the main reasons for the low energy density in current SSBs. In this work, it is demonstrated with both modeling and experiments that in the regime of high cathode loading, the utilization of cathode material in the solid‐state composite is highly dependent on the particle size ratio of the cathode to the solid‐state conductor. The modeling, confirmed by experimental data, shows that higher cathode loading and therefore an increased energy density can be achieved by increasing the ratio of the cathode to conductor particle size. These results are consistent with ionic percolation being the limiting factor in cold‐pressed solid‐state cathode materials and provide specific guidelines on how to improve the energy density of composite cathodes for solid‐state batteries. By reducing solid electrolyte particle size and increasing the cathode active material particle size, over 50 vol% cathode active material loading with high cathode utilization is able to be experimentally achieved, demonstrating that a commercially‐relevant, energy‐dense cathode composite is achievable through simple mixing and pressing method.