<A target="_blank" href="http://www.wired.com/wiredscience/2011/02/self-healing-batteries/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+wired%2Findex+%28Wired%3A+Index+3+%28Top+Stories+2%29%29">Microspheres, containing indium gallium arsenide, embedded inside</A> the graphite of a battery anode can be used to repair the tiny cracks that develop due to charge/discharge cycles. The technology could be used on batteries in phones and cars.