A brief description of anode materials for lithium batteries

Anode material: graphite is mostly used. New research has found that titanate may be a better material. Negative reaction: Lithium ions are deintercalated during discharge, and lithium ions are inserted during charging. When charging: xLi+xe6C-LixC6 when discharging: LixC6→xLi+xe+6C is roughly divided into the following categories: The first type is carbon anode materials: graphitized carbon materials, amorphous carbon materials. For example, graphite, soft carbon, mesophase carbon microspheres have been developed and researched in China, and a variety of carbon materials such as hard carbon, carbon nanotubes, and buckyball C60 are being researched. The anode materials actually used in lithium batteries are basically carbon materials, such as artificial graphite, natural graphite, mesophase carbon microspheres, petroleum coke, carbon fiber, and pyrolytic resin carbon. The same as the second type is tin-based anode materials: tin-based anode materials can be divided into tin oxides and tin-based composite oxides. Oxide refers to the oxide of tin metal in various valence states. There are no commercial products. The third type is a lithium-containing transition metal nitride anode material, which has no commercial products. The fourth type is alloy anode materials: including tin-based alloys, silicon-based alloys, Chu-based alloys, aluminum-based alloys, ladder-based alloys, magnesium-based alloys and other alloys. There are no commercial products. The fifth type is nano-scale anode materials: carbon nanotubes, nano-alloy materials. The sixth type of nano material is nano oxide material: At present, Hefei Xiangzheng Chemical Technology Co., Ltd. is based on the latest trends in the market development of the lithium battery new energy industry in 2009. Many companies have begun to use nano titanium oxide and nano silicon oxide to add to the traditional traditional Graphite, tin oxide, and carbon nanotubes greatly increase the charge and discharge capacity and the number of charge and discharge of lithium batteries. Several concepts related to lithium battery anode materials. Electrochemical capacity: the amount of electricity per unit mass of active material that is charged or discharged to the maximum extent, generally expressed in mAh/g. Irreversible capacity loss: In the process of charging and discharging, the charge and discharge efficiency of the electrode is less than 100%, and the electrochemical capacity of discharge is lower than that of charge, and the lost part is called irreversible capacity loss. Electrode potential: The electrode potential of an ideal negative electrode material should be close to that of metallic lithium, and it does not change much with the amount of lithium inserted. The electrode potential of graphite varies from 0.4V to 0.0V, which is a more suitable negative electrode material. Charge and discharge rate: reflect the speed of battery charge and discharge. Cyclicity: The ability of electrode materials to maintain electrochemical capacity during repeated charging and discharging. The battery cycle is related to the structural stability, chemical stability and thermal stability of the electrode material. There are problems with lithium battery anode materials (1) The voltage lags behind, that is, the intercalation reaction of lithium proceeds between 0~0.25V (related to Li+/Li), while the deintercalation reaction occurs at about 1V; (2) In theory, further deepen. This depends on the preparation of various high-purity, well-structured raw materials and carbon materials and the establishment of more effective structural characterization methods. The development direction of anode materials for lithium batteries (1) Smaller nano-scale lithium-intercalation microstructures. (2) Preparation of high-purity and regular microstructure carbon anode material. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Compared with the performance of lithium iron phosphate batteries and ternary lithium batteries, which one is more advantageous?