The negative pole refers to the lower end of the potential (potential) in the power supply. In the galvanic cell, it refers to the electrode that acts as an oxidation, and the battery reaction is written on the left side. From a physical point of view, it is a pole of electrons flowing out of the circuit. The negative electrode material refers to a raw material constituting the negative electrode in the battery. Currently, the common negative electrode materials include a carbon negative electrode material, a tin-based negative electrode material, a lithium-containing transition metal nitride negative electrode material, an alloy negative electrode material, and a nano-scale negative electrode material.
Since 2016, the development of anode materials in lithium battery materials has also achieved great breakthroughs in technical barriers. It has begun to use lithium battery materials in the sintering process on a large scale. The positive significance of research and development is very worthy of recognition. In October 2016, researchers and research teams of the Chinese Academy of Sciences developed aluminum and carbon nanosphere composites with a core structure and applied them to high-performance, low-cost lithium-ion batteries. The novel structure effectively solves the problems of volume shrinkage expansion and poor cycle performance of the battery anode material during the charging and discharging cycle.
The results show that the new battery material has a capacity retention rate of 96.3% after 2000 rpm at a charge and discharge rate of 20 amps (5-6 minutes); even when the power density is as high as 3650 watts, the energy of the battery material The density is still 160 watt-hours, which is much higher than most commercially available lithium-ion batteries on the market.
The results have guiding significance for the modification of low-cost metal anode/negative materials, and are expected to promote the rapid development of high-energy, low-cost secondary batteries based on low-cost metal anodes. It is necessary to develop a high-capacity negative electrode for developing a 400Wh / kg lithium ion battery. The theoretical specific capacity of silicon-based anodes is 10 times that of graphite anodes, which is the focus of the development of anode materials in China. The project team, supported by the National Key R&D project “New Energy Vehicles”, designed and manufactured adaptive silicon/carbon anode materials with high specific capacity through in-situ coating and etching. The team retained a buffer space between the active nano-silicon core and the carbon shell, which exhibited self-adaptation and good structural and interfacial stability during charge and discharge. It is understood that the specific capacity of the material reaches 1300 mAh per gram, 3C, 500 weeks and 5C, and the capacity retention rate after 1000 weeks is as high as 90% and 80%. The project laid the foundation for the development of high-energy lithium-ion batteries, further improving the driving range of electric vehicles.
It can be seen that the maintenance and specification operation of the anode material sintering furnace is very important for the equipment used for sintering the anode material. Ensuring continuous operation of the furnace is the key to maximizing the efficiency of the equipment. Therefore, strengthening the "three services, one stable, one continuous" mode of operation is an effective way to eliminate equipment hidden dangers and three services. The tail seals, kiln head seals, size ring gears, electrical equipment and other parts use hands, eyes, legs, and timely maintenance and adjustment to ensure that everything is in good working condition. By adjusting the amount of pulverized coal, the primary and secondary air streams stabilize the thermal system in the kiln to ensure safe, efficient and long-term continuous operation of the furnace. Look at the information (touch), do not sloppy in the equipment inspection, should carefully observe the various parts of the equipment, carefully check the operating status of the previous equipment, in order to transfer in this operation, to avoid repetitive problems. During the inspection, sniff the electrical equipment to see if there is any smell, and whether the bearing temperature in each place meets the requirements of the back of the hand (hand touch, palm up). In summary, the equipment is always under control through on-site inspection of the equipment to ensure safe production.