What is lithium crystal in lithium battery?
When a lithium-ion battery is being charged, Li+ is deintercalated from the positive electrode and intercalated into the negative electrode; but when some abnormal conditions: such as insufficient lithium intercalation space in the negative electrode, too much resistance to Li+ intercalation in the negative electrode, Li+ de-intercalates from the positive electrode too quickly, but cannot be intercalated in the same amount. When abnormalities such as the negative electrode occur, Li+ that cannot be embedded in the negative electrode can only obtain electrons on the surface of the negative electrode, thereby forming a silver-white metallic lithium element, which is often referred to as the precipitation of lithium crystals. Lithium analysis not only reduces the performance of the battery, greatly shortens the cycle life, but also limits the fast charging capacity of the battery, and may cause catastrophic consequences such as combustion and explosion. One of the important reasons leading to the precipitation of lithium crystallization is the temperature of the battery. When the battery is cycled at low temperature, the crystallization reaction of lithium precipitation has a greater reaction rate than the lithium intercalation process. The negative electrode is more prone to precipitation under low-temperature conditions. Lithium crystallization reaction.
How to solve the problem that the lithium battery cannot be used at low temperature
Need to design an intelligent battery temperature control system. When the ambient temperature is too low, the battery is heated, and when the battery temperature reaches the battery working range, the heating is stopped.
Post time: Jun-19-2023
