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 method 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 energy consumption, suitable for research laboratories.
1.4 Method mechanical alloy
2. Liquid phase synthesis method
2.1 Liquid phase co-precipitation method
2.2 Sol-Gel method
2.3 Hydrothermal synthesis method
< p>3. Other synthesis methodsDischarge plasma sintering technology, spray pyrolysis technology and pulsed laser deposition technology are also used in Used for the synthesis oflithium iron phosphate.
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Disadvantages of lithium iron phosphate materials
1. Poor conductivity. 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 composite material.
2. The grip density is low. Generally, it can only reach 1.3 to 1.5 g/ml. The low density after packing can be regarded as the biggest defect of the phosphate iron and lithium. 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.
The composition ratio of lithium iron phosphate is generally 20 mAh/g.
Lithium iron phosphate is a lithium-ion battery electrode material with the chemical formula LiFePO4. It is mainly used in various lithium-ion batteries.
LiFePO4 serves as the positive electrode of the battery. It is connected to the positive electrode of the battery by a sheet of aluminuminium. There is a polymer separator in the middle, which separates the positive electrode from the negative electrode. However, lithium Li+ ions can pass through but e- electrons cannot. Right The negative electrode of the battery is made of carbon (graphite) and is connected to the negative electrode of the battery by a copper foil. Between the upper and lower ends of the battery is the battery electrolyte, and the battery is sealed by a metal casing.
The lifespan of lithium iron phosphate batteries
is closely related to its operating temperature. If the operating temperature is too low or too high, it will cause great hidden dangers when charging. , discharge and use process. Especially when used in electric vehicles in northern China, lithium iron phosphate batteries cannot provide normal power or electric power.Electric power is too weak in autumn and winter, and the temperature of the working environment must be adjusted to maintain its performance. Domestic lithium iron phosphate solutionThe constant temperature working environment of the battery must consider space constraints. A common solution is to use airgel felt as an insulation layer.
Reference for the above content: Baidu Encyclopedia-Lithium Iron Phosphate