The electrolyte is replaced by a solid electrolyte, which has the following advantages:
- The energy density can be greatly improved. (positive electrode)
In the past, because of the fear of side reactions between high-voltage cathode materials and electrolyte dissolution, and irreversible phase transitions on the surface of the anode, they were afraid to use them. After using a solid electrolyte, you can use a high-voltage cathode material that increases the energy density of the battery, which can significantly increase the energy density and easily exceed 400Wh/kg.
2. The charging speed can become faster. (negative electrode)
The negative electrode determines the charging speed of the battery, and the lithium metal negative electrode cannot exist stably in the electrolyte. After using a solid electrolyte, the electrolyte will not react violently with the lithium metal negative electrode, and can achieve fast charging and fast discharging within ten minutes. 6C charging Discharge properly.
3. The safety is further improved. (diaphragm)
The electrolyte of existing lithium batteries is flammable, and once it leaks or volatilizes, it will easily cause the battery to catch fire. The solid-state electrolyte is non-flammable. Even if the diaphragm is pierced, it will not leak or volatilize. The safety can be greatly improved. The ternary lithium battery is no longer demonized.
- Low temperature is not afraid of battery diving. (electrolyte)
At low temperatures, the viscosity of the electrolyte will increase, and the ion conduction velocity will slow down, resulting in a mismatch in the electron migration velocity of the external circuit, severe polarization of the battery, and a sharp decrease in charge and discharge capacity. The use of solid electrolyte will not be affected by the low temperature environment. It is not afraid of power loss at -40°C.
- The cycle life is longer. (Negative electrode SEI film)
Affecting the cycle life of lithium-ion batteries is that the number of lithium ions is constantly decreasing. When lithium ions migrate to the surface of the negative electrode, some lithium ions do not enter the negative electrode active material to form a stable compound. After obtaining electrons, they are deposited on the surface of the negative electrode to become metal lithium, and no longer Participate in the subsequent cycle process, resulting in a decrease in capacity. The solid electrolyte solves the problem of the solid electrolyte interface film formed by the liquid electrolyte during charging and discharging, greatly improving the cycle life of the lithium battery, ideally 45,000 times.
6. The demand for thermal management will be reduced accordingly.
Under the charge-discharge cycle conditions of the solid-state battery at a high temperature of 170°C, no significant increase in side reactions can be observed. In addition, when the battery is charged and discharged at a low temperature of -40°C, it can also be observed that there is still very stable charge and discharge at low temperatures. Due to the dense stacking of solid electrolyte, no cooling is required after packaging.