Lithium batteries ternary material 10 research progress

1 high nickel ternary material

In general, three Yuan high nickel anode material refers to material of nickel in mole fraction is greater than 0.6, the ternary material has the characteristics of high capacity and low cost, but there is also a retention capacity is low, poor thermal stability of defects.

Inventory: The lithium battery10 ternary material is reviewed

Through the improvement of preparation technology can effectively improve material performance. Micro-nano size and morphology structure of particles, to a great extent, decides the performance of high nickel ternary cathode material. So it is the main preparation methods of different materials to evenly spread, through the different growth mechanisms, specific surface area of nano spherical particles.

In numerous preparation methods, the coprecipitation method combined with high temperature solid phase method is the mainstream method, coprecipitation method, were first introduced in to get raw materials mixing, material particle size uniformity of precursor, and then by high temperature calcination process for surface morphology neat, easy to control the ternary material, this is the main method of industrial production.

Spray drying the coprecipitation process is simple, fast preparation, the material appearance as coprecipitation, have the potential to further study. High nickel ternary cathode material of cation and charging and discharging process of mixed phase change such as faults, by doping modification and coating modification can effectively improve. While reduce the side effects and stable structure, improve the electrical conductivity, cycle performance, ratio performance, storage performance, and performance of high temperature and high pressure, will continue to be a research hot spot.

2 rich lithium ternary material

Below three Yuan the anode materials for lithium xLi2MnO3 ˙ (1 -) x LiMn1/3 ni1/3 co1/3 o2 (0.1 x 0.5) or less or less structure schematic, due to its special structure, can emerge more lithium and has the advantages of wide voltage window and high specific volume was favored by researchers in recent years.

All of this material has the characteristics of high voltage, and the first charge and discharge mechanism and subsequent charge different: for the first time, charge will cause the change of the structure, the change is reflected in the charging curve has two 4.4 V as the boundary of different platforms, the second time in the process of charging, the charging curve is different from the first curve, because for the first time in the process of charging Li2O from layered structure Li2MnO3 irreversible emerge, at around 4.5 V platform.

Using solid phase method, sol-gel method, hydrothermal method, spray pyrolysis, and different structure was prepared by coprecipitation method can with rich lithium ternary cathode material, which use more is coprecipitation method, and all have their respective advantages and disadvantages of each method.

Lithium inventory: The battery10 ternary material is reviewed

Rich lithium ternary material shows a good application prospect, is the next generation high capacity Lithium ion batteries One of the key materials required, but for large scale applications.

The material of the future research direction are mainly the following several aspects:

(1) to take off the lack of understanding of the intercalated-li mechanism cannot explain material coulomb efficiency will be low, the phenomenon such as large difference of material properties;

(2) the doping elements study enough, a single;

(3) due to the high voltage anode material erosion by electrolyte, caused by poor circulation stability;

(4) commercial application is less, in the aspect of safety performance of comprehensive enough.

3 single crystal ternary cathode material

Lithium electricity Ternary material under high voltage, with the increase of cycling times, secondary particles or late state reunion single crystal may appear a particle boundary flour or reunion state of single crystal separation phenomenon, caused by internal resistance greaten, quick battery capacity attenuation, cyclic variation.

Single crystal type high voltage ternary material, can significantly improve the efficiency of the lithium ion transfer, and reduce the side effects between materials and electrolyte, so as to improve the cycle performance of materials under high voltage. First was prepared by coprecipitation ternary precursor material, and then under the action of high temperature solid phase, for single crystal LiNi0.5 Co0.2 Mn0.3 O2.

Material this material has good layer structure, under 3 ~ 4.4 V, 0.1 button cell discharge specific capacity can reach 186.7 MAH/g, all the battery discharge specific capacity after 1300 cycles is 98% of the initial discharge capacity, is a kind of electrochemical performance of three Yuan positive composite materials.

Up LiYe adopt unique preparation technology, designed and equipped with advanced lithium-ion battery cathode material production line, large scale production for the first time in international micron grade single crystal particles modified spinel lithium manganese acid and nickel cobalt manganese acid lithium anode material, ternary achieve yearly produces 500 tons of production capacity.

Inventory: lithium-ion batteries ternary material 10 research progress

Graphene has a single atom thick two-dimensional structure, stable structure, conductivity of 1 x 106 s/m. Graphene used in lithium ion battery has the following advantages: (1) good electrical and thermal conductivity, help improve the ratio of the battery performance and security;(2) relative to the graphite and graphene lithium storage space, can improve the energy density of batteries;(3) particle size for micro/nano scale, the lithium ion diffusion path is short, to improve the power performance of the battery.

JAN group using the grinding method, first mix material graphene and type 811 Yuan, then 50 ℃ environment 8 h, stir again after drying, graphene / 811 composites. Due to the effect of modification of the graphene, capacity and cycle stability and rate performance of the anode materials have improved significantly.

WANG, when precipitation ternary precursor preparation to join the graphene, lamellar structure of graphene into its cavity structure reduces the reunion of a particle, relieve external pressure to reduce the number of secondary particles crush broken, graphene three dimensional conductive network improve the performance of materials at high magnification willfulness and circulation.

Inventory: lithium-ion batteries ternary material 10 research progress

5 high voltage electrolyte

Ternary material due to the high voltage window, has been more and more attention and research. However, due to the current commercial use of carbonate base electrolyte electrochemical stability window is low, high voltage anode material has yet to industrialization.

When the battery voltage is 4.5 (vs. Li/Li +) electrolyte began to occur around severe oxidation decomposition, lithium battery set off reactions can't normal. Through the development and application of new type high voltage electrolytic fluid system or high pressure film-forming additives to improve the stability of the electrode/electrolyte interface is an effective way of developing high voltage type electrolyte.

Inventory: lithium-ion batteries ternary material 10 research progress

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