I Power battery Material Science
The performance of lithium ion battery mainly depends on the positive and negative electrode materials. At present, lithium cobalate, lithium manganate and lithium iron phosphate are widely used power battery materials. Their safety performance and cycle life are incomparable with other materials, which is also the most important technical index of power battery. Large capacity lithium ion batteries made of lithium iron phosphate cathode materials are easier to use in series to meet the needs of frequent charging and discharging of electric vehicles. Lithium iron phosphate has the advantages of non-toxic, pollution-free, good safety, wide source of raw materials, low price, long life, etc. It is an ideal cathode material for new generation lithium ion batteries.
The anode material of lithium battery is mainly composed of graphite and carbon powder, which needs to be calcined and synthesized at high temperature 。
II Microwave heating technology Production of power battery materials Technical features and advantages
1. Adopt simple production process that is easy for industrialization Microwave industrial equipment Automatic control, continuous production, fast and easy temperature regulation, energy conservation and environmental protection, greatly reducing the cost of industrialization.
2. Special mechanochemical activation method, one-step synthesis, multi-component doping, and on-site composite are used to shorten the reaction time, reduce the reaction temperature, and enhance the stability of product performance.
3、 Microwave high temperature Baking the negative electrode material of the power battery greatly improves the tamping density and specific surface area of the material, thus greatly improving the charging and discharging capacity and charging capacity of the power battery. Because of the high temperature of microwave, the characteristics of the heating technology enable the sintered material to be heated as a whole and evenly, ensuring the tamping density and specific surface area, The product performance is greatly improved.
III Hunan Zhongsheng Microwave equipment Features and advantages:
1. Microwave antenna is used to feed energy in a large area to avoid local overheating caused by microwave concentration.
2、 microwave heating The cavity adopts a wave homogenizing device to ensure uniform temperature of heated materials.
3. High air volume variable frequency fan is used to drain moisture to ensure timely discharge of moisture in the furnace and prevent condensation water in the furnace; The condensed water in the moisture discharge pipeline is collected and discharged in a centralized manner to prevent it from dropping to the ground.
4. Full automatic deviation correction mechanism is adopted to dynamically correct deviation, so as to ensure that the conveyor belt operates within the allowable error range (± 25mm) of the process. Automatic tensioning mechanism is adopted to ensure that the conveyor belt does not slip.
5. An online microwave leak detector is set at the inlet and outlet of the equipment conveyor belt, which will automatically alarm when the microwave leakage exceeds the standard; Microwave leakage prevention device: microwave leakage is not more than 1mW/cm two (The national standard microwave leakage is not more than 5mW/cm two ）The security is greatly improved. A hand-held microwave leak detector is equipped to detect the microwave leakage in other places around the equipment at any time.
6. Multiple infrared thermometers are set, and the microwave power can be automatically adjusted with the temperature, which can strictly control the temperature of materials, so that microwave drying The temperature of each section of the furnace can be strictly controlled. In addition, the speed of the conveyor belt can be adjusted by frequency conversion. Different process parameters can be adjusted at any time to ensure that the material reaches the required moisture content.
