Here we demonstrate a long-cycle-life calcium-metal-based rechargeable battery for grid-scale energy storage. The tissues of the oesophagus, stomach or intestines will be coated by the barium sulphate and these tissues will therefore appear on x-rays.Calcium is an attractive material for the negative electrode in a rechargeable battery due to its low electronegativity (high cell voltage), double valence, earth abundance and low cost however, the use of calcium has historically eluded researchers due to its high melting temperature, high reactivity and unfavorably high solubility in molten salts. A patient would be asked to swallow a barium meal which contains barium sulphate. Barium sulphate can be used in X-rays as it is opaque to x-rays meaning that the rays won’t pass through it.
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