Along with the energy crisis and environmental pollution, as the most ideal energy, lithium-ion battery are getting a lot of attention. However, there are some failure phenomena occur in the process of production, transportation, and use of lithium-ion battery. The failure is caused by a series of complex chemical and physical interactions within the battery. Correct analysis and understanding of failure phenomena plays an important role in improving the performance and technology of lithium-ion batteries. It mainly analyzes from internal and external cause.
Internal Resistance (IR) increased
The internal resistance of lithium-ion battery is related to the process of electron transport in the battery system, which is mainly divided into ohmic resistance and polarization internal resistance. The polarization internal resistance is mainly caused by electrochemical polarization, which consists of electrochemical polarization and concentration polarization. Key materials of batteries and the environment used increase internal resistance of lithium-ion batteries. In the battery system, the abnormal key materials were the fundamental factors affecting the increase of internal resistance and the polarization of the batteries.
Internal Cells Short Circuit
Short circuit performance can be divided into: copper / aluminum collector between the short circuit. Diaphragm failure loss of electronic insulation or gap change to the positive and negative micro contact, local heating serious, and then further charge and discharge process, may spread to the four sides, forming thermal control. The transition metal impurity in the positive electrode paste is not removed, which pierces the membrane or promotes the formation of lithium dendrite in the negative electrode, resulting in internal short circuit. Lithium dendrites lead to the occurrence of internal short circuit. In addition, in the process of battery design and manufacturing or battery pack assembly, unreasonable design and excessive local pressure will also lead to internal short circuit.
How to Extend the Life of Lithium Batteries?
1. Avoid exposing to high or low temperature, especially while charging.
2. Avoid charging too much or too little.
3. Avoid fast charging and discharging
4. Finally, avoid using or storing in humid condition, and avoid mechanical damage, such as puncture.
