Concepts related to lithium battery anode materials

Anode materials for lithium batteries: (1) Carbon materials: graphitized carbon materials and amorphous carbon materials. For example, graphite, soft carbon and mesocarbon microspheres have been developed and researched in my country, while hard carbon, carbon nanotubes, buck ball C60 and other carbon materials are being researched. (2) Other materials: nitrides, silicon-based materials, tin-based materials, new alloys, nano-oxides, etc. Lithium battery anode material cathode material: graphite is important. New research shows that titanate may be a better material. Negative reaction: do not plug in lithium ion when discharging, insert lithium ion when charging. When charging: xLi+xe6c-lixc6 discharge: LixC6→xLi+xe+6C can be divided into the following categories: The first type is carbon cathode materials: graphitized carbon materials, amorphous carbon materials. For example, graphite, soft carbon and mesocarbon microspheres have been developed and researched in my country, while hard carbon, carbon nanotubes, buck ball C60 and other carbon materials are being researched. The cathode materials of lithium batteries are basically carbon materials, such as artificial graphite, natural graphite, mesophase carbon microspheres, petroleum coke, carbon fiber, and pyrolytic resin carbon. The second is tin-based anode materials: tin-based anode materials can be divided into tin-based oxides and tin-based composite oxides. Oxides are oxides of tin, a metal of various valences. There are no commercial products. The third type is lithium transition metal nitride cathode material, which has no commercial products. The fourth type is alloy anode materials: including tin-based alloys, silicon-based alloys, tsu-based alloys, aluminum-based alloys, ladder-based alloys, magnesium-based alloys and other alloys. There are no commercial products. The fifth is nano-scale cathode materials: carbon nanotubes, nano-alloy materials. Six kinds of nano materials are nano-oxidized materials: Hefei Zhang is currently a Chemical Technology Co., Ltd. According to the latest market development trend of the lithium battery new energy industry in 2009, many companies have begun to use nano-titanium oxide and nano-silica to add traditional graphite, tin oxide, carbon nanotubes, and greatly increase the discharge and discharge of lithium batteries. Frequency of charge and discharge. There are several concepts about lithium battery cathode materials. Electrochemical capacity: The amount of electricity per unit mass of active material is charged or discharged to the maximum extent, generally expressed in mAh/g. Irreversible capacity loss: During the charge and discharge process, the charge and discharge efficiency of the electrode is less than 100%, and the electrochemical capacity of the discharge is less than the electrochemical capacity of the charge. The part of the loss is called the irreversible capacity loss. Electrode potential: The electrode potential of an ideal cathode material should be close to that of metallic lithium, and it does not change much with the amount of lithium embedded. The electrode potential of graphite varies from 0.4v to 0.0v and is a suitable cathode material. Charge and discharge rate: The charge and discharge rate of the battery. Cyclicity: The ability of the electrode material to maintain its electrochemical capacity during repeated charging and discharging. The roundness of the battery is related to the structural stability, chemical stability and thermal stability of the electrode material. There is a problem with the negative electrode material of lithium batteries (1) The voltage lags behind, that is, the lithium ion embedding reaction occurs between 0~0.25V (related to Li+/Li), and the non-embedded reaction occurs at about 1V; this theory needs to be further deepen. This depends on the preparation of various high-purity, structural materials and carbon materials, and the establishment of more effective structural characterization methods. The development direction of lithium battery cathode materials (1) Smaller nano-scale lithium-intercalation microstructure. (2) Preparation of high-purity carbon cathode materials with regular microstructures. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.