- January 2021
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- In this work we report the preparation of additive-free ceramic Li4Ti5O12(LTO) electrodes with high thickness(∼250μm) by the conventional tape casting method followed by binder removal and sintering. By optimizingthe sintering process, high porosity (25–35 %), needed for a good electrolyte wetting, was achieved. In addition,the use of an Ar/H2reducing atmosphere during the thermal treatments increases the required electronicconductivity of the sintered electrode due to the combination of a carbon coating coming from incomplete binderdecomposition and the partially reduction of Ti4+. Due to the absence of binders, thefinal electrode has almost100 wt. % active material, leading to very high volumetric (250 mA h cm−3) and areal (6−8mA h cm-2) ca-pacities. This process paves the way for large-scale production of thick electrodes with applications in all-solid-state batteries (ASSBs), leading to more safety lithium-ion batteries (LIBs).
- all-solid-state batteries; binder-free; high areal capacity; tape casting; thick electrode