BioSolar is developing a novel Super Battery
cathode material which uses an advanced, low-cost polymer to replace the intercalation cathode material in a LI-ion battery. Here are their claimed characteristics:
Add to this very high cycle life and you have an extremely attractive battery. Here is some of the verbiage from their site:
BioSolar wrote:Our novel high capacity cathode is engineered from a polymer, similar to that of low-cost plastics used in the household. Through a smart chemical design, we are able to make the polymer hold an enormous amount of electrons. Instead of conventional cathodes that use lithium-ion intercalation chemistry, which is inherently slow, we exploit the fast redox-reaction properties of our polymer to enable rapid charge and discharge.
Most lithium-ion batteries cannot retain more than 80% of its storage capacity after 1,000 charge-discharge cycles. The stable redox chemistry of our cathode material can enable much longer life. Our laboratory experiments have shown that our cathode can easily cycle over 50,000 times without degradation in supercapacitors, and we believe that it can be very effective in batteries as well.
By enabling higher charge-discharge cycles, we can extend the life of lithium-ion batteries and further reduce the total cost of ownership. In certain applications such as off-grid solar energy storage where the batteries are fully charged and discharged daily, it is not cost-effective to use current lithium-ion batteries due to short replacement life.
The only thing I don't see mentioned on the website is efficiency. Since current intercalation chemistries achieves very nearly unity efficiency, it is hard to imagine a redox-based approach achieving similar performance. OTOH, I'm not sure how they could hope to achieve charge rates over 5C if efficiency is significantly lower. We'll see.