1. The concept of lithium battery edge resistance
The edge resistance of lithium batteries refers to the resistance of the internal materials and electrolytes of the battery to the discharge and charge of the battery. It reflects the electron conduction capacity inside the battery and directly affects important performance indicators such as the battery’s power output, energy efficiency and charging time.
2. Common phenomena of poor edge resistance and their causes
① High resistance: Too high edge resistance is one of the common problems of lithium batteries. This may be caused by low electrolyte conductivity, poor material conductivity, large contact resistance or unreasonable internal structure of the battery.
② Unstable resistance: The instability of edge resistance may be caused by factors such as expansion and contraction of electrode materials, decomposition of electrolyte or passivation of electrode surface.
③ Excessive local resistance: In lithium batteries, local resistance may be too high, which is usually caused by defects or short circuits in certain areas inside the battery.
④ Increased contact resistance: The increase in contact resistance may be caused by poor contact between electrode and electrolyte, contamination or corrosion of electrode surface.
4. Solutions to poor edge resistance
① Optimize electrolyte formula: Select electrolyte with high conductivity and optimize its composition and concentration to improve the conductivity of electrolyte.
② Improve material conductivity: Use positive and negative electrode materials with better conductivity, or improve the conductivity of materials through surface treatment and other methods.
③ Reduce contact resistance: Ensure good contact between the electrode and the electrolyte. The contact resistance can be reduced by optimizing the electrode structure design, improving the electrode surface treatment, etc.
④ Optimize the internal structure of the battery: Rationally design the structure of the battery, reduce the distance between the electrodes, and optimize the diffusion path of the electrolyte to reduce the internal resistance of the battery.
⑤ Quality control and testing: During the production process, strengthen quality control, conduct strict resistance tests on the battery, and promptly discover and eliminate products with poor edge resistance.
