Solid electrolyte for lithium ion battery
Solid electrolyte, also known as "super ionic conductor" or "fast ionic conductor".
It refers to a kind of solid ionic conductive materials whose ionic conductivity is close to (or in some cases exceeds) the melt over and electrolyte solution. It is a kind of strange solid material between solid and liquid. It is an abnormal state of matter. Some atoms (ions) have mobility close to that of liquid, while other atoms maintain their spatial structure (arrangement). This liquid-solid duality and its broad application prospects in various fields such as energy (including production, storage and energy saving), metallurgy, environmental protection and electrochemical devices have attracted extensive attention of physicists, chemists and materials scientists
Polymer solid electrolyte is a solid electrolyte material formed by the complexation of polymer containing solvable polar groups with salt. In addition to showing the properties of common conductivity systems such as semiconductors and ionic solutions, it also has plasticity unmatched by inorganic solid electrolytes, which makes polymer solid electrolytes show three advantages in application:
Films of any shape and thickness. Therefore, although the room temperature conductivity of polymer electrolyte is not high, which is 2 ~ 3 orders of magnitude lower than that of inorganic electrolyte, the internal resistance of the battery is greatly reduced due to processing into a very thin membrane, so the low conductivity can be compensated by increasing the area / thickness ratio; Tightness - complete contact with the electrode to increase the charge and discharge current; Stress - it can well withstand the change of pressure and adapt to the change of electrode volume during charge and discharge. Polymer solid electrolyte has the advantages of light weight, pressure resistance, earthquake resistance, fatigue resistance, non-toxic and non-corrosion, and the electrochemical stability when it forms a battery with electrodes, which opens up a wider prospect for its application. At present, scientists at home and abroad are committed to making it be applied to energy storage, electrochemical components, sensors and other research, and has become the most powerful competitor in the development process of high specific energy lithium battery.