The voltage drop of the battery is obvious when it is resting, resulting in high first charge capacity, low discharge capacity and low first efficiency, which may be caused by the following reasons:
1. High self-discharge rate
Self-discharge reaction occurs inside the Lipo battery, resulting in voltage drop. High self-discharge rate may be related to the following factors:
Electrolyte impurities: impurities trigger side reactions and accelerate self-discharge.
Electrode material instability: the material reacts with the electrolyte, leading to self-discharge.
Defective diaphragm: defective diaphragm or micro-short circuit increases self-discharge.
2. Electrode material problem
Improper selection of electrode materials or poor preparation process may lead to the following problems:
Excessive first-charge capacity: the material has an irreversible reaction during the first charge, consuming too many lithium ions.
Low discharge capacity: unstable material structure or poor conductivity, affecting lithium ion embedding and detachment.
3. Electrolyte problem
Improper electrolyte composition or additives may trigger side reactions, resulting in:
-Low first efficiency: the side reaction consumes active lithium ions and reduces the first charge/discharge efficiency.
Voltage drop: the side reaction continues to consume lithium ions, and the voltage drops significantly when the battery is left to stand.
4. Battery design or manufacturing defects
Problems in battery design or manufacturing may result:
High internal resistance: High internal resistance leads to low discharge capacity and rapid voltage drop.
Improper assembly: Poor assembly may lead to internal short circuit or poor contact, affecting performance.
5. Environmental factors
High temperature or high humidity environment will accelerate self-discharge and side reactions, leading to voltage drop and performance degradation.
Solution
Optimize materials: Select stable electrode materials and electrolyte to reduce side reactions.
Improve process: Optimize the battery manufacturing process to ensure the quality of diaphragm and electrode.
Control environment: Avoid storing and using the battery in high temperature or high humidity environment.
Detect self-discharge: screen batteries with high self-discharge rate and avoid using them.
Through these measures, battery performance can be effectively improved.
Post time: Mar-06-2025
