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mAh g-1 is very simple to understand. It is common notation to put a -1 exponent to indicate division. Work to calculate the energy density comparison when th

mAh g-1 is very simple to understand. It is common notation to put a -1 exponent to indicate division. Work to calculate the energy density comparison when that isn't even the point of the article. Everyone can look up the energey density and theoretical of a li-ion battery: 100-265 Wh/kg. There is absolutely no need to calculate anything. Focus on the substance of the article. 60x faster charging rate as compared to Lithium-ion and make a comment regarding that. Otherwise your comments are as pointless as my reply to it.

omgwtfbyobbq 5y ago
The problem with the article is that it lacks substance. As an example, it mentions that al-ion has intrinsic advantages and disadvantages compared to li-ion, but it only talks about advantages. Aluminum-ion technology has intrinsic advantages and disadvantages over the preeminent lithium-ion battery technology being used in almost every EV today. What do calendar and cycle life in different conditions look like? How do weight/volume per unit power/energy compare with existing li-ion cells? And so on... It seems like they found a way to improve the energy density of the al-ion cells mentioned in this Stanford news story. https://news.stanford.edu/2015/04/06/aluminum-ion-battery-033115/ https://news.stanford.edu/2015/04/06/aluminum-ion-battery-03... But without more detailed specs, it's impossible to compare their cells to existing li-ion cells outside of the specific examples they are using.
qayxc 5y ago
> It is common notation to put a -1 exponent to indicate division. I have zero issues with using negative exponents, what I do take issue with is writing "g-1" in an online publication. You either use proper HTML to write an exponent as an exponent, or you use division. "g-1" is not a a unit, it spells out "gram - 1", which makes no sense at all and there's zero excuse for not even using the commonly accepted crutch "g^-1".
labawi 5y ago
My laptop battery charges under a minute, but that doesn't make it any good. If you have no issues with the units / expressions used in the article, could you please explain what is the power and energy density from this quote: > Stanford’s natural graphite aluminum-ion technology delivers 68.7 Watt-hours per kilogram and 41.2 Watts per kilogram, while its graphite-foam bumps up to 3000Wh/kg. > The GMG-UQ battery heaves that forward to between 150 and 160Wh/kg and 7000Wh/kg.

omgwtfbyobbq 5y ago

The problem with the article is that it lacks substance. As an example, it mentions that al-ion has intrinsic advantages and disadvantages compared to li-ion, but it only talks about advantages. Aluminum-ion technology has intrinsic advantages and disadvantages over the preeminent lithium-ion battery technology being used in almost every EV today. What do calendar and cycle life in different conditions look like? How do weight/volume per unit power/energy compare with existing li-ion cells? And so on... It seems like they found a way to improve the energy density of the al-ion cells mentioned in this Stanford news story. https://news.stanford.edu/2015/04/06/aluminum-ion-battery-033115/ https://news.stanford.edu/2015/04/06/aluminum-ion-battery-03... But without more detailed specs, it's impossible to compare their cells to existing li-ion cells outside of the specific examples they are using.

qayxc 5y ago

> It is common notation to put a -1 exponent to indicate division. I have zero issues with using negative exponents, what I do take issue with is writing "g-1" in an online publication. You either use proper HTML to write an exponent as an exponent, or you use division. "g-1" is not a a unit, it spells out "gram - 1", which makes no sense at all and there's zero excuse for not even using the commonly accepted crutch "g^-1".

labawi 5y ago

My laptop battery charges under a minute, but that doesn't make it any good. If you have no issues with the units / expressions used in the article, could you please explain what is the power and energy density from this quote: > Stanford’s natural graphite aluminum-ion technology delivers 68.7 Watt-hours per kilogram and 41.2 Watts per kilogram, while its graphite-foam bumps up to 3000Wh/kg. > The GMG-UQ battery heaves that forward to between 150 and 160Wh/kg and 7000Wh/kg.