Grid Think

So I have decided to embrace the fact that Fe-Cr batteries operate at a fundamentally higher temperature. But now you'll say it makes no sense to heat the battery, the costs alone would bankrupt me.  Let's take a sample system of 1 MW / 10 MWh,  If we assume a conservative energy density of 10 Wh/L, Volume of electrolyte (L) = Total energy required  / Energy density  Volume =  10,000,000Wh / 10 Wh/L  =1,000,000 L  We would need 1 million liters of electrolyte and calculate the mass of water as by keeping density as 1 kg/L.  mass (kg) = volume  x density of water  m = 1,000,000 L x 1 kg/L = 1,000,000 kg  If I take the conservative specific heat of water as 4,187 J/kg·K, s tart with an ambient temperature of 20°C and keep my ΔT as 20°C,  Q (heat energy) = m x c x ΔT   m = mass of water = 1,000,000 kg , c = specific heat capacity of water = 4,187 J/(kg·K)  ΔT = temperature change = 40°C - 20°C = 20 K   Q =...

You know I have been wrong before, but never so pleasantly surprised. I spent the last two months trying to copy VRFB........ well, not exactly. I wanted to make an Iron-Chromium Redox Flow Battery that was just as good as VRFB. That means its power density, efficiencies and performance should match closely with VRFB.  But as I have stated many times earlier, Fe-Cr batteries have a fundamental flaw, they can't operate at room temperature, which is the fundamental reason why they have not been commercialized yet. In my previous post I wrote about a paper that I had recently found, it added salt to the battery in order to enable it to operate  at room temperature. Let's understand how  The paper used salt to increase the kinetics of chromium at room temperature. This happened because the lithium (or in my case sodium) chloride increased the concentration of chloride ions in the electrolyte solution. This causes excessive Cl⁻ ions in the electrolyte solution and increased c...