Spent shell as a calcium source for constructing calcium vanadate for high-performance Zn-ion batteries†
Lei
Wang, 
a
Yuanxiang
Gu
*a
and
a
Yuanxiang
Gu
*a
and
Abstract
In this article, waste shell is directly used as a raw material to synthesize CaV3O7 as a cathode for aqueous zinc ion batteries. The obtained cathode material exhibits better performance than that of CaV3O7 prepared from pure calcium carbonate as a raw material. At 0.1 A g−1, the CaV3O7 prepared by spent shell as a calcium source displays a highly reversible discharge capacity of 373 mA h g−1. A high initial discharge capacity of 177.7 mA h g−1 can be gained at 5.0 A g−1, and the specific capacity remains at 133.3 mA h g−1 with a capacity retention of 75% after 3000 cycles. This work may spark inspiration for energy storage and generate more effective routes for recycling solid waste.
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