New progress has been made in the research of solid-state nano metal batteries
Back
2020/12/11 10:29:20
Recently, the Chinese Academy of Sciences, in a news release said the dalian institute of chemical physics research team developed a "high room temperature ionic conductivity of polymer gel light solid electrolyte", it shows excellent room temperature ionic conductivity and excellent flexibility, wide electrochemical window, which can build an aspect ratio, high rate, long cycle performance of sodium metal batteries.
Sodium ion metal, rich in content and widely distributed, makes sodium ion battery become a competitive electrochemical energy storage device.Sodium is located directly below lithium in the periodic table of elements. The gold property of lithium is stronger than sodium, but its reaction degree in water is significantly lower than sodium, and its chemical property is more active than lithium, which is also the difficulty in the development of sodium metal batteries.Because the radius of Na+ is larger than Li+, the graphite negative intercalation reaction commonly used in lithium ion batteries is not applicable to sodium ion batteries.In some studied anode materials, the sodium anode has a high theoretical capacity (1165 mAh/g) and a low REDOX potential (-2.71V vs.The standard hydrogen potential is characterized as an ideal anode material for developing high output voltage and energy density sodium ion batteries.However, there are still safety problems in sodium metal batteries in organic electrolyte system, such as electrolyte leakage and sodium dendrite formation, which inhibit their practical application.
The "photopolymeric gel quasi-solid electrolyte with high room temperature ionic conductivity" developed by the research team of Dalian Institute of Chemical Physics can be used for high-power, long-life nano metal solid state batteries.This battery has a reversible discharge capacity of 55mAh/g, similar to mainstream lithium batteries, and has excellent safety performance, and far beyond the current cycle life performance of lithium batteries.The battery can maintain 1000 cycles of life under 5 coulombs of high current fast charging.The sodium metal softpack batteries obtained also show excellent stability, flexibility and safety performance.This study provides a new direction for the development of room temperature high energy density flexible solid sodium metal batteries.
The research results are published in Advanced Energy Materials.The research work is supported by the National Key RESEARCH and development program and the Clean Energy Innovation Research Institute of the Chinese Academy of Sciences.
Previous
