With the pursuit of energy density of battery, the ternary anode materials (generally referred to as layered lithium NCM nickel cobalt manganate materials)
have attracted more and more attention. The ternary anode material has
the advantages of high specific capacity, good recycling performance and
low cost. By increasing the voltage of the battery and the content of
nickel in the material, the energy density of the ternary positive
electrode material can be effectively improved.
Theoretically, the ternary material itself has the advantage of high voltage. The standard test voltage of the ternary positive electrode material
is 4.35v, under which the ordinary ternary material can show excellent
cyclic performance. The charging voltage is increased to 4.5v, and the
capacity of the symmetrical materials (333 and 442) can reach 190, which
is also good for circulation, while 532 is not so good. When the charge
reaches 4.6v, the circulability of the ternary material begins to
decline, and the flatness becomes more and more serious. At present, it
is difficult to find matching electrolyte with high voltage anode
material.
Another way to increase the energy density of ternary materials is to increase the content of nickel.
In general, high nickel ternary anode material refers to the molar
fraction of nickel greater than 0.6. Such ternary materials have the
characteristics of high specific capacity and low cost, but their
capacity retention rate is low and their thermal stability is poor. The
properties of this material can be effectively improved by improving the
preparation process. The micro-nano size and morphology have a great
influence on the properties of high nickel ternary anode materials.
Therefore, most of the preparation methods adopted at present focus on
uniform dispersion, and obtain spherical particles with small size and
large specific surface area.
In many preparation methods, coprecipitation combined with high temperature solid method is the main method. The coprecipitation method was first used. The precursors with uniform mixing of raw materials and uniform grain size were obtained, and then the ternary materials with regular surface morphology and easy to control process were obtained after being calcined at high temperature. This is also the main method used in industrial production at present. Compared with co-precipitation, the spray drying process is simpler and the preparation rate is faster. The disadvantages of high nickel ternary anode materials such as cationic mixing and phase transition during charging and discharging can be effectively improved by doping modification and coating modification. While inhibiting the occurrence and stable structure of side reactions, improving the conductivity, circulation performance, multiplier performance, storage performance and high temperature and high pressure performance will remain the research focus.
Related Reading:Chemical Powders Binders,LMNO for Lithium Battery,Cathode Raw Materials
Theoretically, the ternary material itself has the advantage of high voltage. The standard test voltage of the ternary positive electrode material
is 4.35v, under which the ordinary ternary material can show excellent
cyclic performance. The charging voltage is increased to 4.5v, and the
capacity of the symmetrical materials (333 and 442) can reach 190, which
is also good for circulation, while 532 is not so good. When the charge
reaches 4.6v, the circulability of the ternary material begins to
decline, and the flatness becomes more and more serious. At present, it
is difficult to find matching electrolyte with high voltage anode
material.Another way to increase the energy density of ternary materials is to increase the content of nickel.
In general, high nickel ternary anode material refers to the molar
fraction of nickel greater than 0.6. Such ternary materials have the
characteristics of high specific capacity and low cost, but their
capacity retention rate is low and their thermal stability is poor. The
properties of this material can be effectively improved by improving the
preparation process. The micro-nano size and morphology have a great
influence on the properties of high nickel ternary anode materials.
Therefore, most of the preparation methods adopted at present focus on
uniform dispersion, and obtain spherical particles with small size and
large specific surface area.In many preparation methods, coprecipitation combined with high temperature solid method is the main method. The coprecipitation method was first used. The precursors with uniform mixing of raw materials and uniform grain size were obtained, and then the ternary materials with regular surface morphology and easy to control process were obtained after being calcined at high temperature. This is also the main method used in industrial production at present. Compared with co-precipitation, the spray drying process is simpler and the preparation rate is faster. The disadvantages of high nickel ternary anode materials such as cationic mixing and phase transition during charging and discharging can be effectively improved by doping modification and coating modification. While inhibiting the occurrence and stable structure of side reactions, improving the conductivity, circulation performance, multiplier performance, storage performance and high temperature and high pressure performance will remain the research focus.
Related Reading:Chemical Powders Binders,LMNO for Lithium Battery,Cathode Raw Materials
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