The electrolyte of the current commercialized lithium-ion battery is liquid, so it is also called liquid lithium-ion battery. In simple terms, all- solid-state lithium-ion battery refers to the battery structure in which all components are in solid form, replacing the traditional lithium ion battery's liquid electrolyte and diaphragm with solid electrolyte.
Compared with liquid lithium-ion batteries, all-solid electrolyte has the following advantages:
1. High safety and excellent thermal stability, can be long-term work under the condition of 60-120 ℃;
2. Wide electrochemical window, can reach above 5V, can match high voltage material;
3. Only lithium ions and do not conduct electrons;
4. The cooling system is simple and has high energy density.
5. It can be applied in the field of ultra-thin flexible battery.
But the disadvantages are also obvious:
1. The ionic conductivity per unit area is low and the specific power is poor at room temperature. The cost is extremely high;
2. Industrial production of large-capacity batteries is difficult.
The performance of electrolyte material largely determines the power density, cycle stability, safety, high and low temperature performance and service life of all solid lithium ion batteries. Solid electrolytes can be divided into polymer electrolytes (usually based on a mixture of PEO and lithium Salts LiTFSI) and inorganic electrolytes (such as oxides and sulfides). All-solid-state battery technology is widely recognized as the next generation of innovative battery technology, which is believed to be more and more mature in the near future. All these problems can be solved.
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