From: RussellMc <apptechnz@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
CC: "ken@elecsyn.com" <ken@elecsyn.com>, "Reid,	John (Oji Fibre Solutions)"
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Date: Mon, 6 Apr 2020 18:21:24 -0700
Subject: Re: [EE]:: Interesting LiIon battery - 25, 000 cycle life, -30C
	operation, 20C charge and discharge, 5 x LiIon power density. .
Thread-Topic: [EE]:: Interesting LiIon battery - 25, 000 cycle life, -30C
	operation, 20C charge and discharge, 5 x LiIon power density. .
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On Sun, 5 Apr 2020 at 23:13, Jason White <whitewaterssoftwareinfo@gmail.com=
>
wrote:

> That's pretty cool Russell.
> Out of curiosity where did the 25000 cycle figure come from?


The batteries are LTO / Lithium Titanate / Lithium Titanium Oxide /
Li4Ti5O12 (see my updated SE answer)
I saw a 25000 cycle figures in some of the battery data (and this is
typical for LTO) - the "over 5000" cycles may be a cautious assumption or
they may have let a realist loose :-).

An excellent example of LTO batteries from a reputable manufacturer with
very extensive experience is Toshiba's SCiB cells.
These have been on the market for over a decade.
These show (1st graph in ref below) *40,000 cycles *at over 90% of original
capacity (!!!).

Memory says that one user of these are the Suzuki Electric cars with LTO
"front ends" to a std LiIon battery bank - allowing rapid charge under
regenerative braking.
The biggest barriers to widespread use of LTO are cost and low energy
density.

https://www.scib.jp/en/product/cell.htm    <- Excellent SCiB overview
datasheet

https://www.scib.jp/en/download.htm  <- SCiB documents.

 https://www.scib.jp/en/product/index.htm  <- Product page. Many links
(many in Japanese)


> Foxell, Ali Express
> https://foxell.aliexpress.com/store/group/LTO-battery-2-4V/1453301_512217=
740.html


Various sellers, Ali Express
https://www.alibaba.com/showroom/lithium-titanate-battery.html


              Russell
--=20
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