Inorganic–organic hybrid solid electrolytes in the tetramethylammonium iodide–LiI–Li2S–P2S5 system for all-solid-state lithium batteries†
b
and
Kiyoharu
Tadanaga
*b
Abstract
A new type of glassy solid electrolyte was prepared by doping tetramethylammonium iodide (TMAI) in Li7P2S8I. The composition of the electrolyte is (1 − x)Li7P2S8I·xTMAI (x = 0, 0.05, 0.1, 0.2). The doping of TMAI in Li7P2S8I did not decrease the ionic conductivity with an increase in the doping content up to x = 0.2. All solid-state batteries using the solid electrolyte as a composite Si electrode were fabricated. The cycling performance of all solid-state cells with Si as the electrode was improved by increasing x. A capacity of approximately 2000 mA h gSi−1 was maintained after 10 cycles for the cell using the electrolyte with x = 0.2. The hybrid electrolyte is considered to suppress the electrode cracking caused by large changes in Si electrodes during charge and discharge.
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