![]() ![]() On the other hand, if the Anode decays quickly, the N/P ratio is higher, so that the Anode is in a shallow charging and discharging state. Decay rate of cathode and anode cycle: If the cathode decays quickly, then N/P is lower than the design, so that the cathode is in a shallow charge and discharge state.If the coating accuracy is poor, it should be considered. The coating accuracy of the equipment: Now the ideal coating accuracy can be 100%.First efficiency of cathode and anode materials: all reacting substances should be considered, including conductive agents, binders, current collectors, diaphragms, and electrolytes.In general, the ratio of cathode and anode in the battery is mainly determined by the following factors: In fact, there is another way of saying it is called CB (cell Balance). ![]() N/P ratio (Negative/Positive) refers to the ratio of anode capacity and cathode capacity. The trend of battery performance when graphite anode is insufficient and anode is excessive 1.Calculation example of N/P ratio of traditional graphite onode lithium-ion battery The preferred solution for battery system design is to use excess cathode and anode capacity limit (N/P ratio < 1.0), which can alleviate the decomposition of the electrolyte due to the high cathode potential in the high-potential region when the battery is close to or in a fully charged state.įigure 1. In addition, it will also cause anode waste, reduce battery energy density, and increase battery cost.įor lithium titanate anode batteries, due to the relatively stable structure of LTOanode, high voltage platform, excellent cycle performance and no Li plating phenomenon, the cause of cycle failure is mainly at the cathode side. If the cathode is excessive, the excess lithium ions from the cathode cannot enter the anode during charging, and will form lithium deposition on the surface of the anode, resulting in the formation of dendrites, resulting in poor battery cycle performance. Therefore, in general graphite anode lithium batteries will have slightly more anode than cathode, but not too much, too much will consume lithium in cathode. When designing lithium batteries, it is very important to correctly calculate the reasonable ratio of cathode and anode capacity. For traditional graphite anode lithium-ion batteries, the shortcoming of battery charge-discharge cycle failure mainly lies in the occurrence of Li plating and dead zone on the anode side, so the scheme of excessive anode is usually adopted. In this case, the battery capacity is limited by the cathode capacity, and the anode capacity/cathode capacity ratio is greater than 1.0 (ie, N/P ratio > 1.0). Three-electrode test with different N/P ratios.Effects of different N/P ratios on battery cycle performance. ![]() ![]()
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