602535 polymer battery.Mater. Yu Jiaguo from Wuhan Institute of Technology. Today: Research progress of nickel-based supercapacitors

Supercapacitors are energy storage devices that buffer the instabilities of wind/solar energy. The specific energy (energy density: ED) and specific power (power density: PD) of supercapacitors combine the advantages of traditional capacitors and batteries. Similarities between supercapacitors and batteries include: 1) energy storage at the electrode/electrolyte interface; 2) ion transport and electron transport. The differential free energy of batteries and supercapacitors: batteries are single electron free energy, while supercapacitors are continuous free energy changes.

Supercapacitors are energy storage devices that buffer the instabilities of wind/solar energy. The specific energy (energy density: ED) and specific power (power density: PD) of supercapacitors combine the advantages of traditional capacitors and batteries. Similarities between supercapacitors and batteries include: 1) energy storage at the electrode/electrolyte interface; 2) ion transport and electron transport. The differential free energy of batteries and supercapacitors: batteries are single electron free energy, while supercapacitors are continuous free energy changes. In batteries, chemical reactions release can be collected into circuits; in supercapacitors, charge is stored primarily electrostatically. Supercapacitors have a series of advantages such as high power, fast charge and discharge speed, long cycle life, and low cost, and their application prospects are broad. However, the performance of supercapacitors is closely related to electrode materials. How to design and prepare high-performance electrode materials directly determines the performance of supercapacitors. This article selects nickel-based materials as the basis and comprehensively analyzes the application of nickel-based materials in supercapacitors. Recently, the author Yu Jiaguo (correspondence) from Wuhan University of Technology in China and others summarized the latest research progress of nickel-based materials; discussed important issues such as the preparation and performance improvement of nickel-based materials; analyzed the root causes of synergistic effects; listed the challenges faced challenges and possible solutions. Finally, some new perspectives are put forward on the future development of nickel-based materials. The relevant results were published on Materials Today under the title "Nickel-based materials for supercapacitors".