Lithium-ion electrolytes with different energy densities are liquids and exist as gels and polymers, making it difficult to reduce battery weight. The electrolyte in lithium batteries is liquid, while the electrolyte in solid-state batteries is solid.
Lithium-ion batteries use an organic liquid electrolyte, which can be used under abnormal conditions such as overcharge and internal short circuit. Batteries tend to heat up easily, causing the electrolyte to swell, which can spontaneously ignite or even explode.
Solid-state batteries have the advantage of good safety. Fluid electrolyte batteries are flammable and explosive, which can easily pose safety hazards. Solid electrolyte can inhibit lithium dendrites, is not easy to burn, is not easy to explode, does not haveno electrolyte leakage and will not cause side reactions at high temperature.
Cause a short circuit
When working under high current, the diaphragm will not be pierced by the lithium dendrites and will not cause short circuit, and no side reactions will occur at high temperatures, there is no combustion due to gas generation, and the energy density is high. The energy density of liquid electrolyte batteries exceeding 500Wh/kg is considered impossible. With the all-solid electrolyte, the battery does not need to use lithium-embedded graphite negative electrodes, but directly uses metallic lithium as the negative electrode. This can significantly reduce the amount of negative electrode material and significantly improve the overall energy density. battery.
The energy density that research andthe development of solid-state batteries can provide can basically reach 300-400 Wh/kg, and the service life is strong. Solid electrolyte solves the problem of solid electrolyte interface film and lithium dendrite phenomenon formed by liquid electrolyte during the charging and discharging process. It greatly improves the cycleability and lifespan of lithium batteries and can ideally reach around 45,000 times.
Lithium batteries for electric vehicles are afraid of freezing. Lithium batteries are inherently difficult to discharge at minus 10°C because the electrolyte solidifies. Under low temperature conditions, the activity of the lithium battery and the lithium insertion activity of the negative active material will be affected, resulting in reduced battery capacity and reduced flow performance. When used in lower temperature conditionsIts, in severe cases, lithium dendrites will form on the surface of the negative electrode and pierce the separator, causing the lithium battery to fail.
Lithium batteries for electric vehicles generally have better resistance to low temperatures, but their capacity will also decrease at -10 degrees. The characteristics of lithium batteries will decrease significantly in low temperature environments, and the voltage and capacity will be much lower. Generally, lithium batteries will behave abnormally below 10 degrees Celsius, so some systems will have a built-in isolation function to prevent lithium batteries. work at low temperatures.
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When the temperature drops, the energy storage capacity of some batteries will decrease. Then he fell. Therefore, the puThe stored power of electric vehicles will weaken in winter, especially in environments below 25 degrees, where the reduction in stored power will be even more evident.
This requires users to strengthen care and maintenance during use to extend the service life. Electric vehicles need to be charged for around 8 hours in winter and can be reduced to two hours in summer. Some citizens don't pay attention to it, get used to charging overnight because it will shorten battery life. The lifespan of electric vehicle batteries also depends on the number of times consumers recharge them. The more frequent the charging, the shorter the battery life.