Abstract
The development of high energy–density lithium-ion secondary batteries as storage batteries in vehicles is attracting increasing attention. In this study, high-voltage bipolar stacked batteries with a quasi-solid-state electrolyte containing a Li-Glyme complex were prepared, and the performance of the device was evaluated. Via the successful production of double-layered and triple-layered high-voltage devices, it was confirmed that these stacked batteries operated properly without any internal short-circuits of a single cell within the package: Their plateau potentials (6.7 and 10.0 V, respectively) were two and three times that (3.4 V) of the single-layered device, respectively. Further, the double-layered device showed a capacity retention of 99% on the 200th cycle at 0.5 C, which is an indication of good cycling properties. These results suggest that bipolar stacked batteries with a quasi-solid-state electrolyte containing a Li-Glyme complex could readily produce a high voltage of 10 V.
Highlights
The development of high energy–density lithium-ion secondary batteries as storage batteries in vehicles is attracting increasing attention
The double-layered device showed a capacity retention of 99% on the 200th cycle at 0.5 C, which is an indication of good cycling properties. These results suggest that bipolar stacked batteries with a quasi-solid-state electrolyte containing a Li-Glyme complex could readily produce a high voltage of 10 V
Lithium-ion secondary batteries are expected to be applied as high energy–density devices for large-scale uses such as electric vehicles[1,2]
Summary
The double-layered device showed a capacity retention of 99% on the 200th cycle at 0.5 C, which is an indication of good cycling properties These results suggest that bipolar stacked batteries with a quasi-solid-state electrolyte containing a Li-Glyme complex could readily produce a high voltage of 10 V. It is necessary to improve their safety To fulfill this requirement, all-solid-state lithium-ion secondary batteries with non-flammable solid electrolytes are attracting attention. We investigated the quasi-solidification of the Li-Glyme complex as an ionic liquid complex; an all-solid-state lithium battery with this electrolyte was proven to operate properly[25,26] and are for the preliminarily tested bipolar multilayered device in our previous reports[27].
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