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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