[PSUBS-MAILIST] Lithium Batteries

[via Personal_Submersibles]

Good information. Thanks.Vance


-----Original Message-----
From: Antoine Delafargue via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Thu, Apr 9, 2020 10:04 am
Subject: Re: [PSUBS-MAILIST] Lithium Batteries

As an investor in battery startups i would keep an eye on Li FePO4. Prices are dropping, it is used in china for low cost electric vehicles and factories need to fill up capacity now that the bigger cars moved to other lithium chemistries. it is somewhat safer than other lithium batteries (harder to set on fire and lower peak temperature in case of thermal run away)
Lithium sulfur is still very limited in number of cycles. It may be ok for our applications but given the price you d want something that lasts a bit. Oxis is a leader there.
Sodium ion is another contender for performance between lead acid and lithium ion. Cost and safety will be good too. Waiting for Faradion notably. 
Regards Antoine 


Le jeu. 9 avr. 2020 à 15:34, via Personal_Submersibles <personal_submersibles at psubs.org> a écrit :

Alan,Nuytco built a bunch of lithium equipped DW3000s for Russia.The weight and charge rates were astonishing. As was the price, apparently. I wonder how those battery banks are holding up now that they are in the field.Vance


-----Original Message-----
From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
To: personal_submersibles <personal_submersibles at psubs.org>
Sent: Wed, Apr 8, 2020 9:21 pm
Subject: [PSUBS-MAILIST] Lithium Batteries

I have been watching the progress of lithium sulphur & other new lithiumbattery technologies & they seem to be inching closer to commercialisation with a few break throughs recently.There are figures of 700 W/L ( Watts per Litre) being touted.Lead acid have an energy density of 80 W/L & they recommend not dischargingthem below 50%, so 40 W/L. Lithium batteries have a depth of discharge of 80%   so in the case of the 700 W/L battery that would be 560 W/L available.This means 14 X more power available for the same amount of space using thenew lithium technology.https://www.greencarcongress.com/2020/03/20200315-sion.htmlIt might be worth keeping in mind for future builds, as it may make things likeair conditioning & extra or larger motors a more viable consideration.I know they have always said that the lithium sulphur batteries will be cheaperthan lead acid on a W/L basis.Below is a chart showing comparisons between lead acid & a standard lithiumion battery.Alan


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