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New Vanadium Phosphate Nanocomposite Li-ion Electrode Material for High-Power Batteries

A team from Central South University, China; the US’s Pacific Northwest National Laboratory (PNNL); and the University of Washington have developed a new nanostructured composite vanadium phosphate material for Li-ion battery cathodes for use in high-power batteries.

The team prepared the nanostructured Li3V2(PO4)3/carbon composite by incorporating the precursor solution into a highly mesoporous carbon with an expanded pore structure.

When cycled within a voltage range of 3 to 4.3 V, the composite delivered a reversible capacity of 122 mAh g-1 at a 1C rate and maintained a specific discharge capacity of 83 mAh g-1 at a 32C rate.

These results demonstrate that cathodes made from a nano-structured Li3V2(PO4)3 and mesoporous carbon composite material have great potential for use in high-power Li-ion batteries.

—Pan et al.

A paper on their work is in press in the journal Electrochemistry Communications.

Resources

  • Anqiang Pan, Jun Liu, Ji-Guang Zhang, Wu Xu, Guozhong Cao, Zimin Nie, Bruce W. Arey and Shuquan Liang (2010) Nano-Structured Li3V2(PO4)3/Carbon Composite for High-Rate Lithium-Ion Batteries. Electrochemistry Communications doi: 10.1016/j.elecom.2010.09.014

Comments

Engineer-Poet

Superb high-current performance (more than 67% at 32C rate!) but nothing about durability under cycling.

Biodiversivist

Call me when the inventors open a battery factory like A123.

HarveyD

How long will it take somebody to use all the best components to come up with a superior battery? Would patent rights stop it?

SJC

I don't think that you can just combine some of this and some of that. One chemistry has high capacity and another can be charged/discharged rapidly.

122 mAh g-1 at a 1C rate

This shows 122 Wh per kg at 1C, that is not as high as some, but trades that off for higher power. Either higher power or higher energy density, that seems to be the decision.

HarveyD

SJC. At 3 volts (avg), wouldn't that be closer to 366 Wh/Kg, if all other components perform as well.

SJC

I stand corrected, you are right.

SJC

That being the case, these sound good but it is just a paper right now.

doggydogworld

Average volts would be more like 3.6. But I suspect 122 mAh/g is for cathode only, not the whole battery.

SJC

That could be the case, 400+ Wh per kg and 32C in one battery would be quite a development.

HarveyD

400+ Wh/Kg is not an impossibility by 2015/2020. Current 100 miles range EVs would get over 200 miles by then with equivalent weight battery pack.

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