The group of Yongbing TANG at CAS Shenzhen Institutes of Advanced Technologies has reported on a new type of calcium ion batteries (CIB) which uses activated carbon as anode and tin as a cathode. Reportedly this CIB has a good rate and cycling performance as well as high capacity and working voltage, and it retained 84 percent of its initial capacity after 1,000 cycles at room temperature.
CAS news release, March 13, 2019