Particular attention should be paid to the production of lithium-ion batteries:
1. The ratio between the positive and negative electrode materials of lithium-ion batteries should be reasonable.
2. Choose the appropriate electrolyte. The electrolyte has a significant impact on the lifespan of lithium-ion batteries.
3. Set reasonable usage conditions and ranges, such as charging and discharging rates, operating temperature range, storage temperature range, charging and discharging cut-off voltage, etc., to prevent the battery from exceeding its usage. limit.
Fourth, strengthen battery safety protection, establish battery safety valves, use heat-sealing diaphragms, charge special protection circuits, activate special battery management systems, etc. , to improve the safety of battery useand improve battery cycle life.
5. After the production of 3C lithium batteries is completed, performance testing is required to verify whether the battery quality is qualified. The application of high current spring microneedle modules can achieve good conduction and help improve testing efficiency. .
Lithium iron phosphate battery process
Mixing (active materials of positive and negative electrodes + conductive agent + binder + dispersant) - coating ----- roller pressing - -- --- -Slitting-----Tab welding----Winding (or joining)--Adhesive paper---Insertion into cell shell--Welding--Sealing---Compliance, etc. the whole industry is similar. The main difference lies in the difference in battery equipment or products. For example, soft packaging lamination, cylindrical winding, square winding and lamination coexist,which results in the coexistence of battery cells during the winding process. The most important and basic technology is mixing and coating, as well as final formation;
Preparation method
1. Solid phase synthesis method:
1.1 High-temperature solid phase reaction method: Now the most commonly used and mature synthesis method.
1.2 Reduction carbothermal (CTR): The synthesis method is simple, easy to use, and the price of raw materials is low. Suitable for large-scale production.
1.3 Microwave synthesis method: short synthesis time, low power consumption, suitable for laboratory research.
1.4 Mechanical alloying method
2. Liquid phase synthesis method
2.1 Liquid phase co-precipitation method
2.2 Sol-gel method
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2.3 Hydrothermal synthesis method
3. Other methodssynthesis
Discharge plasma sintering technology, spray thermal decomposition technology and pulsed laser deposition technology are also used in the synthesis of lithium iron phosphate.
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Disadvantages of lithium iron phosphate materials
1. This question is the most critical. A major problem is why lithium iron phosphate was not widely used so late. However, this problem can now be perfectly solved: by adding C or other conductive agents. Laboratory reports can reach a specific capacity of more than 160 mAh/g. The conductive agent was added to the lithium iron phosphate materials produced by our company during the production process and does not need to be added during the manufacturing of batteries. In fact, the material must be: LiFePO4/C, such a material composite.
2. Vibration and density degree is lower. Generally, it can only reach 1.3 to 1.5 g/ml. Low tap density can be said to be the biggest defect of lithium iron phosphate. This shortcoming makes it have no advantage in small batteries such as cell phone batteries. Even though it has low cost, good safety performance, good stability and high cycle times, if the volume is too large, it can only replace lithium cobalt oxide in a small amount. This gap will not be significant in power batteries. Therefore, lithium iron phosphate is mainly used to make electric batteries.