New technology brings sulfide all-solid-state lithium-ion batteries one step closer to industrialization

On July 5th, it was learned from the Qingdao Institute of Bioenergy and Processes, Chinese Academy of Sciences that the advanced energy storage materials and technology research group led by researcher Wu Jianfei of the institute has focused on basic scientific issues and battery scale in the field of sulfide all-solid-state lithium-ion batteries.
In terms of preparation technology, a series of new breakthroughs have been made
.
The related results were published in the international journal "Chemical Electrochemistry"
.

Sulfide all-solid-state lithium-ion batteries have pioneered a series of problems such as low energy density, flammability, and explosion that exist in liquid lithium batteries by virtue of their high energy, rapid charge and discharge, good low-temperature performance, high safety, and long life.
problem and become a disruptive frontier technology
.
Sulfide solid electrolytes have many advantages, which make sulfide all-solid-state lithium batteries have both high energy density and high rate performance
.
Many car companies in the world have invested in the research and development of sulfide all-solid-state lithium batteries and released mass production plans
.

The key core material of sulfide all-solid-state lithium-ion batteries is sulfide electrolyte.
The ionic conductivity of sulfide electrolytes reported at room temperature is getting higher and higher, which is comparable to the ionic conductivity of organic electrolytes used in commercial lithium-ion batteries
.

Over the years, the scientific research team has been committed to the development of high-performance sulfide solid electrolytes.
Using high-throughput computing methods, a high-conductivity sulfide solid electrolyte has been developed.
Its room temperature ionic conductivity has reached the international level, and sulfide solid electrolytes have been established.
Electrolyte pilot production line with kilogram batch production capacity
.

On this basis, the research team has recently made key progress in the research on the air stability of sulfide electrolytes.
By doping the electrolyte with soft acid substances and hard alkali substances, both high ionic conductivity has been obtained.
, sulfide electrolyte material with excellent electrochemical stability and air stability
.

According to reports, in order to break through the technical bottleneck of the industrialized preparation of sulfide all-solid-state soft-pack lithium batteries, the scientific research team independently innovated a number of key technologies, such as the preparation of ultra-thin electrolyte membranes with a thickness of less than 20 microns, the development of high-stability electrode packs It has built a stable electrode/electrolyte interface technology, as well as technologies such as homogenization, coating, and electrode forming.
It has also successfully developed a pouch battery with excellent rate and low temperature performance, taking the lead in breaking through the cycle life of an all-solid-state pouch lithium battery.
Due to poor technical difficulties, an all-solid-state soft-pack lithium battery with long cycle life was successfully developed, with 850 cycles and a capacity retention rate of 94%
.

At present, the scientific research team has completed the laboratory technology manufacturing, has established a laboratory production line of all-solid-state soft pack batteries, and explored the production mode of sulfide all-solid-state lithium-ion batteries.
It has laid the foundation for the industrial production of all-solid-state soft pack batteries
.