A new type of high voltage potassium ion miniature supercapacitor was developed

Release time: 2021-03-30 19:23:38  Hits: 15

Dalian Institute of Chemical Physics, Chinese Academy of Sciences

A new type of high voltage potassium ion miniature supercapacitor was developed

Recently, Wu Zhongshuai, a researcher from Dalian Institute of Chemical Physics, Chinese Academy of Sciences, developed a high-voltage potassium ion micro-supercapacitor based on Mxene derived potassium titanate anode material, and built an integrated micro-system of micro-supercapacitor and pressure sensor.The study was published in the journal Advanced Energy Materials.

 

Due to the ultra-high power density, fast charge and discharge rate and long life, micro ultracapacitors have great potential in the field of flexible, wearable and implantable microelectronics. However, they still have problems such as low energy density and narrow potential window.Among many metal ions, potassium ions have abundant resources, low reduction potential, weak solvation effect and small Stokes radius in non-aqueous electrolyte, which contribute to the increase of potassium ion transfer number and ionic conductivity.However, there are still challenges in the rational design of key materials and devices for potassium ion miniature supercapacitors.

 

In this study, the team developed a strategy to simultaneously oxidize and alkalize Mxene to produce novel potassium titanate nanorods.The material has high aspect ratio, ion diffusion coefficient and specific potassium storage capacity.Then, the researchers used potassium titanate as the negative electrode, activated graphene as the positive electrode, combined with a high-voltage ionic liquid gel electrolyte, to construct a new type of potassium ion micro-supercapacitor.The capacitor has a high voltage window of 3.8V, which is better than the previously reported miniature supercapacitors. The volume energy density reaches 34.1MWh /cm3, and it has excellent rate performance and cycling performance.In addition, the capacitors are compatible with pressure sensors on the same flexible substrate for sensitive monitoring of body movement.

 

According to the team, the research not only provides a new idea for the design of high-performance miniature ultracapacitors, but also provides an example for flexible electronic devices powered by miniature ultracapacitors.

                                                                                                                                   source  Chinese Science News


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