Adsorption and Release Abilities of Zinc Ions Using Calcium Silicate Hydrate and Effect of Its Addition on Reaction for Zinc Anode Batteries

Abstract

　An experiment was conducted on an electrolyte for an aqueous zinc-based rechargeable battery containing calcium silicate hydrate (C–S–H). Conventionally, the zinc-based rechargeable battery has a problem that the cycle life characteristic is poor due to the dendrite generated during charging and discharging. This is because the amount of zincate-ion eluted in the electrolytic solution is unstable, and the electrode reaction during charging and discharging is irreversible. The purpose of this study is to utilize the zinc absorption and release abilities of C–S–H to balance the amount of zinc ions in the electrolyte and carry out a uniform dissolution-precipitation reaction. C–S–H showed a Langmuir type in a zinc sulfate solution when adsorbing zinc, and an equal amount of calcium was released at the same time as zinc adsorption. As a result of performing a cycle test with the prepared Zn/Mn battery, the characteristics were improved by interposing C–S–H on the surface of the zinc anode.