Flexible and stable quasi-solid-state zinc ion battery with conductive guar gum electrolyte

Solid electrolytes have high energy density and strong cycle performance, which is an important direction of solid-state battery research. Recently, Huang Yuan and Zhang Jiyan of Peking University Shenzhen Graduate School prepared a quasi-solid electrolyte using natural biopolymer guar gum and applied it to a flexible zinc ion battery, effectively solving the growth of negative electrode zinc dendrite Problem, improve the stability of solid zinc ion battery.

Guar gum is a non-toxic, biocompatible, and degradable natural polysaccharide polymer, which is widely used in food, pharmaceutical, cosmetics, personal health care, petroleum, mosquito repellent, papermaking, textile printing and dyeing industries.

Guar gum quasi-solid electrolyte has excellent flexibility and high ionic conductivity. The researchers found that the flexible solid zinc ion battery based on this electrolyte can maintain 81.3% of the initial capacity even after being folded 1000 times, and can maintain 85% of the initial capacity after 2000 cycles, indicating that it has good mechanical flexibility and cycle stability Sex.

Compared with aqueous electrolyte, guar gum solid electrolyte has better low temperature performance, can work safely in the temperature range of 5-45 ℃, and can effectively inhibit the growth of dendrites. The researchers also conducted a hammer test and underwater test on the flexible solid zinc ion battery based on the electrolyte. The results show that the battery can work normally when it is hammered or in an underwater environment performance.

In summary, the use of guar gum quasi-solid electrolyte can effectively suppress the formation of negative electrode zinc dendrites, and maintain the structural stability of the positive electrode active material after a long cycle, which can effectively improve the stability of solid zinc ion batteries. Guar gum solid electrolyte zinc ion battery has high capacity, good rate performance, excellent cycle stability and high reliability after bending cycle, which can meet the application needs in flexible wearable electronic devices.