4 ms·

This is close to on par with Lithium ion (cobalt/nickel) 200-250Wh/kg. Newer Li/S technology is 2x denser (400-500Wh/kg) but currently has durability issues ove

This is close to on par with Lithium ion (cobalt/nickel) 200-250Wh/kg. Newer Li/S technology is 2x denser (400-500Wh/kg) but currently has durability issues over recharge cycles. Al/graphene in this form could be more cost effective and probably marginally lighter due to a lack of cooling/heating needed, safety equipment, and rare earth minerals needed. That it charges faster and has more durability over recharge cycles would be a bonus. Another open question is if you can produce this at industrial scale relatively cheaply, because having affordable gigawatt storage for renewables would be lovely. This: https://finance.yahoo.com/finance/news/gmg-graphene-aluminium-ion-battery-200435268.html https://finance.yahoo.com/finance/news/gmg-graphene-aluminiu... may be a better article. Here is a clarifying quote: > Dr Ashok Nanjundan, GMG’s Chief Scientific Officer, said, “This is a real game-changing technology which can offer a real alternative with an interchangeable battery technology for the existing lithium-ion batteries in almost every application with GMG’s Graphene and UQ’s patent-pending aluminium ion battery technology. The current nominal voltage of our batteries is 1.7 volts, and work is being carried out to increase the voltage to directly replace existing batteries and which lead to higher energy densities.” > “The real differentiator about these batteries is their very high power density of up to 7000 watts/kg, which endows them with a very high charge rate. Furthermore, graphene aluminium-ion batteries provide major benefits in terms of longer battery life (over 2000 charge / discharge cycles testing so far with no deterioration in performance), battery safety (very low fire potential) and lower environmental impact (more recyclable),” said Dr Ashok Nanjundan.

jeffbee 5y ago
Aren't energy density, weight, and bulk all irrelevant in large-scale fixed service?
- altcognito 5y ago
  Within limits, otherwise pumping water uphill would be more common as an energy storage technique. The durability, operation at all temperature, and use of common, "easily" obtained ingredients are very relevant though.
  - bagacrap 5y ago
    I see lots of water towers in Texas.
    - reportingsjr 5y ago
      Water towers aren't even close to the scale needed for reasonable energy storage. A typical water tower holds about 4 million liters of water and is about 50m tall. The Racoon Mountain Pumped Storage reservoir holds 410 BILLION liters of water (so 410 thousand times what a water tower holds) and has a head of 320m. So you'd need about 1.6 million water towers with energy extraction capability to be equivalent to just that one pumped storage plant, ignoring the fact that you'd have to do /something/ with that water to extract the energy at the right time, when typically it's just drained out as people need it for faucets/showers/whatever. On top of this, you'd be dropping a lot of the pressure from the water tower, which is like 99% of the reason that water towers exist, to provide adequate water pressure.

jeffbee 5y ago

Aren't energy density, weight, and bulk all irrelevant in large-scale fixed service?

altcognito 5y ago
Within limits, otherwise pumping water uphill would be more common as an energy storage technique. The durability, operation at all temperature, and use of common, "easily" obtained ingredients are very relevant though.
- bagacrap 5y ago
  I see lots of water towers in Texas.
  - reportingsjr 5y ago
    Water towers aren't even close to the scale needed for reasonable energy storage. A typical water tower holds about 4 million liters of water and is about 50m tall. The Racoon Mountain Pumped Storage reservoir holds 410 BILLION liters of water (so 410 thousand times what a water tower holds) and has a head of 320m. So you'd need about 1.6 million water towers with energy extraction capability to be equivalent to just that one pumped storage plant, ignoring the fact that you'd have to do /something/ with that water to extract the energy at the right time, when typically it's just drained out as people need it for faucets/showers/whatever. On top of this, you'd be dropping a lot of the pressure from the water tower, which is like 99% of the reason that water towers exist, to provide adequate water pressure.