Research and development of high performance of calcium ion battery in China

Recently, shenzhen institute of advanced technology, Chinese academy of sciences researcher Tang Yongbing functional thin film materials research center and the team united tsinghua - Berkeley shenzhen institute, Chinese academy of sciences institute of metal material science shenyang , a researcher at the national center for research to develop a high performance of calcium ions battery.Them through to the battery structure innovation, make the calcium ion battery has a new chemical reaction mechanism, and realizes stable charge and discharge reaction at room temperature.Related to the results of the study, published online in nature - chemistry.

In alkaline earth metal elements, calcium has the polarization is low, the standard electrode potential and lithium close, ion to + 2 (number of charged twice of the lithium ion), is abundant, the advantages of lower cost.Therefore, calcium ion battery has become a high efficiency low cost Energy storage battery Potential.

In 2016, the researchers developed a new type of calcium ion liquid battery, its high working voltage, though not (< 1 v), but at high temperatures (550 ~ 700 ℃), but showed good cycle stability.At room temperature, the researchers didn't find calcium ion of reversible REDOX reaction, but in the 75 ~ 100 ℃, found that calcium in calcium carbonate type electrolyte can in the cathode surface reaction, reversible deposition and under 100 ℃ can cycle more than 30 weeks.But to make the calcium ion battery has practical value, its working temperature should be reduced to room temperature, need to find a can realize reversible calcium ions into/out of anode materials and improve its chemical properties, including room temperature cycle, ratio characteristic and working voltage (< 2 v).

The researchers put forward a new type of calcium ion battery, with tin foil as the cathode reversible alloying reaction with calcium ions, and at the same time adopt active material integration design;With graphite as the anode of anionic reversible Internationale/embedded reaction;With six fluoridate, with 5 v high pressure resistant properties of carbonate solvent for electrolyte.The calcium ion battery has excellent chemical performance, average discharge, medium voltage of 4.45 V at room temperature cycle capacity retention rate is more than 95% after 350 times.

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