L R AS Published on Monday 14 December 2020 - n° 344 - Categories:other batteries
Briefly about batteries: QuantumScape; Solid Power; flexible battery, Relectrify, vanadium flow battery
Briefly about batteries: QuantumScape; Solid Power; flexible battery, Relectrify, vanadium flow battery
The American company QuantumScape has just presented its solid-state batteries.
Its battery has no anode. The ceramic separator creates a metallic lithium anode within the cell when the cell is charged.
The batteries tested were single-layer pocket cells with no excess lithium on the anode and thick cathodes, operating at charge rates of 1 C and discharge rates of 1 C to 30 C.
QuantumScape's ceramic separators operate at high power rates that allow 80% charge in 15 minutes. This is better than what any type of vehicle battery is capable of delivering.
Its energy density is more than 400 watt-hours per kilogram.
The solid state design eliminates the need for a carbon or carbon-silicon anode. The energy density is increased because there is no excess lithium on the anode.
The battery is reportedly capable of operating for more than 800 cycles with a capacity retention of more than 80% and is predicted to last for hundreds of thousands of kilometres of driving.
The flexible ceramic separator operates down to -30 C, temperatures that cause other battery types to fail.
QuantumScape's solid separator is non-combustible and insulates the anode from the cathode, even at high temperatures.
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US battery developer Solid Power has begun pilot production of solid lithium metal batteries at its Colorado plant. It is beginning formal testing to qualify its batteries so that they can be integrated into vehicles by early 2022. The company reports that its battery achieves an energy density of 330 W/h per kilogram, which is far better than current lithium-ion batteries.
https://www.pv-magazine.com/2020/12/11/scaling-up-solid-state-batteries/
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A flexible battery was developed by screen printing on a polymer film. It has lost none of its performance after repeated twisting, bending or stretching. This battery is silver oxide and zinc. Its surface energy density is about 5 to 10 times higher than the best lithium-ion solutions available today. The capacity of the battery is 10 to 20 times that of conventional lithium-ion batteries, reaching 50 milliamps per square centimetre at room temperature. Researchers at the University of California at San Diego and the battery company ZPower
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The American company Relectrify has reused batteries from Nissan Leaf vehicles with proprietary inverter technology. This provided a high efficiency AC output without the need for an inverter. It operates at a storage capacity of 60 kWh and creates grid-compliant AC waveforms by orchestrating a number of voltage contributions from individual cells within a battery pack.
The system has undergone 500 charge and discharge cycles in and out of the grid. The majority of the cycles were at more than 20 kW of continuous power, for a total energy output of more than 25 MWh. During testing, the pilot system achieved a cycle efficiency of approximately 88% on average, including charge and discharge conversion.
"The efficiency is higher than expected; the lifetime is better than expected, especially considering that the temperature of these batteries and the number of cycles they undergo are much higher than what could be seen in most applications.»
https://www.pv-magazine.com/2020/12/11/relectrify-posts-results-from-second-life-battery-systems/
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A 2 MW/8MWh vanadium flux battery is to be built in Australia to absorb the output of a 6 MW solar power plant, demonstrating the potential of this technology for controlling energy and frequencies in the grid.
https://www.pv-magazine.com/2020/12/11/australian-pv-plant-tests-2-mw-8-mwh-vanadium-flow-battery/
