As global climate change accelerates, a rapid transition in the energy infrastructure is essential to prevent irreversible damage.
FREMONT, CA: Global climate change will cause irreversible damage in the next decade, so a rapid transition in energy infrastructure is crucial. A practical approach to decarbonization involves storing electrical energy for 8 hours with lithium-ion batteries (LIBs), generating wind/solar power, and using existing fossil fuel facilities to back up.
It is argued that fire safety and recycling are the key challenges to reaching a 100 terawatt-hour LIB storage scale, rather than capital costs, battery cycle life, or mining and manufacturing. We provide a brief overview of these two directions and the ongoing innovations that are taking place.
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Eight hours of energy: According to a quantitative study, LIB has the advantages of having fast response rates, high energy density, good energy efficiency, and reasonable cycle life among the existing electricity storage technologies today, including pumped hydro, compressed air, flywheels, and vanadium redox flow batteries. The LIB technology is expected to outperform all other technologies by 10 percent or more in 10 of the 12 grid-scale application scenarios like black start, power quality, primary, secondary, and tertiary responses, except for seasonal energy storage and primary response.
It does not mean LIBs cannot be a crucial component of a low-carbon energy transition. According to quantitative modeling, eight hours of battery energy storage will unlock significant wind/solar power generation, significantly reducing global carbon emissions by USD 5 trillion. If the LIB cost drops below USD 150/kWh (system), wind/solar + LIB can reach a 95 percent equivalent availability factor (EAF) in warm states, achieving cost parity with fossil fuel generation. As a result, 19 out of 20 days can be used to reduce CO2 emissions by 80 percent or more using wind/solar and LIB. We would need to fire up our natural-gas power plants in places such as Arizona and Texas if we experienced a week-long wind/solar drought because the week-long drought will force us to turn on our wind/solar + LIB power plants. A 50 percent reduction is still possible in colder states, even though we would have to fire up natural gas more often and use heavy oil to heat our homes, especially during the winter. The plan states that we should not demolish our fossil-fuel power plants (after all, they are sunk costs) but instead use them as backups until 2040–2050, enabling an economically feasible amount of LIB storage to significantly blunt the rate of ocean acidification and climate change.
Fire safety: Since grid-scale ESS is much newer and more complex than transformers, the thermal design is more challenging up to 30 percent round-trip energy loss needs to be dissipated as heat), so fault diagnosis and risk mitigation are more challenging. Defending against natural disasters like tornadoes and flooding, as well as man-made ones like cyberattacks and arson, is critical. A defense-in-depth design and rapid response strategy can minimize life loss and collateral damage. It doesn't matter where the thermal runaway begins; a tremendous driving force causes it to grow and intensify. At high states of charge (SOC), the cathode material in LIBs is highly oxidative, releasing oxygen generated by surface oxygen ions and lattice oxygen ions, especially at high temperatures. In contrast, the anode material is highly reducing, separated by only a ten m-thick nanoporous battery separator made from polypropylene or polyethylene. A battery cell can heat up to several hundred degrees Celsius without requiring an external oxygen supply.