Finding a cheap, safe alternative battery to lithium is the key to moving the needle to a completely renewable power sector. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [SNIP] BEYOND LITHIUM-ION BATTERIES As with electric vehicles, lithium-ion batteries have become a popular option for the grid, as they offer a high energy density, modular solution for energy storage. However, the use of lithium-ion batteries has also brought along its own challenges with high cost of materials, risk of fire and explosion, and lack of recycling practices limiting the widespread adoption of lithium-ion batteries for the grid. One incredibly promising option to replace lithium for grid-scale energy...