To analyze the data of ternary lithium anode structure and characteristics

Source: 2020 - 03 - 28 sets hits: data of ternary lithium anode structure and characteristics of three metadata is one of the most popular in recent years, the Ni component, can reflect the activity of the data, reflected energy density; Co components is also a kind of active substances, can stable data hierarchy, and can reduce the mixture of cationic, thus is advantageous to the data, the depth of the discharge will affect the discharge capacity of the data; Mn components in speculative plays a supporting role, provide stability in the process of charging and discharging. The ternary lithium, on the basis of comprehensive performance is interested in a few data. Under the three big categories of metadata, three different components of metal elements can be regarded as a different kind of three metadata. One is the Ni: Mn equivalent type, 2 it is Ni: Mn type. Its equivalent for NCM424 and NCM111. In the process of charging and discharging, there is no change in the value of Mn + 4 price, to play the role of a stable structure in the speculation, the Ni + 2 price into a price + 4, lost two electrons, and the data of high specific capacity. Ni, Mn range is the leading role of this article, also known as high nickel ternary lithium, types of the main representative NCM523, NCM622 and NCM811. When the rich nickel three metadata voltage channel less than 4. 4v( Associated with Li + / Li) , generally considered the primary Ni + 2 / + 3 involved in REDOX reaction, valence state increase to + 4. When the voltage is higher than 4. 4 v, participate in the reaction of Co3 + to + 4, not involved in the reaction Mn4 + has the effect of the structure stability. High nickel three yuan on the positive effects of different sliding data have different advantages, can undertake choosing according to specific application requirements. Ni high capacity performance, security is low; Co, high performance, high cost, good stability; Manganese of high safety, low cost. In order to improve the energy density of battery, improve the vehicle's mileage in a row, the direction of the main flow to high nickel is the concept of development, and to travel long distances high nickel reach the use requirement of vehicle safety of three yuan. In addition to all three yuan and sophisticated commercial technology, such as lithium iron phosphate, lithium manganese acid, lithium cobalt oxide, etc. , there are many technical direction, such as lithium sulfur batteries, lithium air batteries, solid-state batteries, etc. , but is far from sophisticated commercial. Ternary lithium battery of the electrochemical performance and safety mainly depends on its microscopic structure ( Particle shape and size structure stability) 。 As well as the physical and chemical properties, Li + relaxation coefficient, electronic conductivity, volume expansion rate and the chemical stability) The influence of. Add Ni can make circular function becomes worse. The poor thermal stability; Charge and discharge process of external response is not uniform; Reverberation product contains a large number of Ni2 +, cause data oxidation, slow oxidation electrolyte, the release of gases. 4. High nickel circulation function with the increase of nickel content, the stability of the positive data. The first cycle of charging and discharging capacity loss and the acceleration of high temperature environment capacity attenuation. 4. 1 cycle capacity attenuation mechanism of the main factors influencing the capacity attenuation in the process of circulation are: cationic hybrid, stress induced micro crack initiation, the introduction of impurities in the process of production, conductive carbon black initio distribution, etc.