Publication date: 10th April 2024
In the composite electrodes of the all-solid-state batteries (ASSBs), huge internal stress is induced by volume change of active materials during charge/discharge processes. Such mechanical stress triggers the capacity fading of the ASSBs and this phenomenon is severe for oxide-type solid electrolytes. In this study, we introduced stress buffers in the cathode composite layer of garnet-based ASSBs to reduce the stress. The cathode composite layer was prepared by quick liquid phase sintering[1] of LiCoO2 (LCO, Young’s modulus: 191 GPa) and Li6.5La3Zr1.5Ta0.5O12 (LLZT, Young’s modulus: 150 GPa) with a rather high loading of 7-8 mg-LCO/cm2. When no stress buffer was added, the charge/discharge capacity gradually decreased after dramatic initial drop. The addition of Li2.2C0.8B0.2O3 (LCBO, Young’s modulus: 50~80 GPa) or Li3BO3 (LBO, Young’s modulus: 100~110 GPa) as stress buffer successfully suppressed the polarization of the charge-discharge, and improved cycle-ability for the initial 10 cycles. However, the ASSBs with the stress buffers showed sudden capacity fading that is possibly caused by the lower fracture toughness of the stress buffers.
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