How zinc-ion batteries may solve our renewable energy storage problem

By Storm William D Gourley, Drew Higgins, McMaster University

Hotter summers, drier forests, rising waters: climate change is not just a threat to our future, it’s hurting our world right now.

While there are many ways human activity has brought about climate change, global electricity generation sources are among the leading culprits. Despite small upticks in the supply of wind and solar power, we have not yet reached a point where we are able to dislodge the fossil fuels that are entrenched in the power mix of many countries.

But why is this still the case?

Since renewable sources deliver an intermittent supply of power, we also need a way to store this energy to meet the demand of the grid when the sun is not shining, or the wind is not blowing. This is a major challenge, as the switch to renewable power also requires establishing long lasting, safe and affordable energy storage systems. As such, finding a cheap, safe and alternative battery to lithium is the key to moving the needle to a completely renewable power sector.

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. But 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 storage is the rechargeable zinc-ion battery. Emerging only within the last 10 years, zinc-ion batteries offer many advantages over lithium. These include cheaper material costs, increased safety and easier recycling options.

With grid-scale energy storage potential at a considerably cheaper cost — and higher levels of safety — widespread commercialization of zinc-ion batteries could be exactly what is needed to integrate renewables into energy infrastructure in Canada and other countries.

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