Analysis of the structure and classification of lithium-ion power lithium-ion batteries

The structure of lithium-ion power lithium-ion batteries generally includes: positive, negative, electrolyte, separator, positive lead, negative plate, center terminal, insulating material ( insulator), safety valve (safetyvent), gasket (gasket), PTC (positive temperature control terminal), battery case. Generally, people are more concerned about the positive electrode, negative electrode, and electrolyte. 3. Classification of lithium-ion power lithium-ion batteries (1) Cylindrical lithium batteries according to the battery shape: currently there are two types of 18650 (diameter 18mm, length 65mm) and 26650 (diameter 26mm, length 65mm), which are mainly used in notebooks and electric Tool category; square lithium battery: there are many types, which are mainly used in mobile phones, digital cameras, etc.; button lithium battery: can meet the requirements of computers, cameras, etc. for high specific capacity and thinness; (2) high temperature lithium according to operating temperature Batteries: mainly used in military, aerospace, etc., and civilian applications are mainly in the GPS field of automobiles; normal temperature lithium batteries: currently commercial lithium batteries can only work in the range of -20~45℃; low temperature lithium batteries: current commercial Lithium battery can only work in the range of -40~55℃; (3) Liquid lithium battery according to the state of electrolyte: the electrolyte is organic solvent + lithium salt; polymer lithium battery: the polymer matrix is u200bu200bmainly HFP- PVDF, PEO, PAN, PMMA, etc.; all-solid-state lithium battery: still in the experimental stage; (4) steel shell lithium battery according to shell material: better sealing; aluminum shell lithium battery: light weight; aluminum-plastic film lithium battery: The battery processing technology is simple, and the quality of the battery is higher than the energy; (5) According to the cathode material, the lithium boring battery: the most widely used, high tap density, high specific energy, stable voltage platform, but it is expensive and pollutes the environment. Poor safety; Lithium manganate: a three-dimensional tunnel structure, lithium ions can be reversibly extracted from the spinel lattice without causing structural collapse, so it has excellent rate performance and stability. Environmentally friendly, but low energy density, high temperature performance; lithium iron phosphate battery: large specific surface area, high energy density, good cycle performance, material batch processing is difficult to achieve high consistency, low temperature discharge performance is not good; (6 ) Graphite classified by negative electrode material: good electrical conductivity, high crystallinity, good layered structure suitable for Li deintercalation, capacity above 300mAh/g, charge and discharge efficiency above 90%, good charge and discharge platform; soft carbon: Low crystallinity, small grain size, good compatibility with electrolyte, low output voltage, no clear charge and discharge platform, high irreversible capacity, basically not commercialized; hard carbon: Li intercalation will not cause expansion, and it is good Charge-discharge cycle performance, high specific capacity, can reach more than 400mAh/g, and good low-temperature performance. It is an ideal negative electrode material for electric vehicle batteries. It has been commercialized in Japan; lithium titanate: zero-strain material, higher potential The formation of lithium dendrites is currently relatively hot, but it has not been used on a large scale due to flatulence problems; silicon-based: ultra-high specific capacity, but due to pulverization problems, it cannot be used in real life, and it is still in the laboratory research stage; statement: this Some pictures and content of articles published on the site are from the Internet. If there is any infringement, please contact to delete the previous article: What are the potential safety hazards of iron-lithium batteries?