Researchers in Japan develop new titanium oxide Li-ion battery anode material with 28.5% more capacity than LTO
28 October 2010
A team from Japan’s AIST and Ishihara Sangyo Kaisha, Ltd. has developed a new titanium oxide material—H2Ti12O25—that exhibits 28.5% higher energy capacity than lithium titanate (Li4Ti5O12, LTO). Additionally, the team developed a synthesis method that can be used at a relatively low temperature of 200-300 °C.
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| Charge-discharge curve of the new material vs. LTO. Click to enlarge. |
The new material features a capacity of 225mAh/g, compared to LTO’s 175 mAh/g. According to AIST, the material can lower costs because it does not contain lithium.
The new material shows cycling properties similar to those of LTO. After 50 cycles, charging capacity and service capacity were 213 mAh/g and 212 mAh/g, respectively—almost the same as the levels after 10 cycles.
Sodium titanate (Na2Ti3O7) is used as a starting material. An acid treatment is applied to it at a temperature of 60 °C to make H2Ti3O7 as a precursor. Subsequent heating to 200-300°C forms H2Ti12O25.
Another small step towards future higher energy density rechargeable batteries. Future EVs will require more than tweaking of current technologies. Now that we have gone over the 200 Wh/Kg barrier, the 300 Wh/Kg and the 400 Wh/Kg barriers must be overtaken before we get practical extended range BEVs.
Posted by: HarveyD | 28 October 2010 at 02:02 PM
I don't think there is too much new here--check out altairnano's titanate cathode or anode coatings--these allow an incredibly fast charge without apparent heat overload--or so they claim--welcome comments!
Posted by: JerseyGeoff | 28 October 2010 at 04:17 PM
The big news here is the lack of Li. If we were to make a decent fast-charge battery without a lithium anode - it should lower materials costs.
Altair's titanate has been proven by third party testing to handle extremely fast charging without safety issues. And 15,000 cycles is typical. Which is why their batteries are the ESS for several new bus designs.
Posted by: Reel$$ | 29 October 2010 at 10:52 PM