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A chemist at the University of California, Berkeley, has tripled the capacity of a lithium-ion battery of the same weight, using a technology that is rich in manganese and layered as a composite positive electrode.
The battery uses conventional lithium manganese spinel cathode technology, a material that arranges atoms in three dimensions. It is well known that in current lithium-ion batteries there is an imbalance between the two electrodes: the negative electrode configuration can accept more charge to increase the specific capacity of the entire battery.
Mn-rich layered technology includes two meanings: 1. Mn-rich: it refers to the high capacity Mn-rich cathode. The test proves that the anode material of lithium ion battery has both active components and inert components. The inert ingredients help stabilize the active material, thus extending battery life. Manganese rich cathode materials can provide a third more energy density. 2, layer: refers to the preparation of the battery using two different layer components, so that the positive electrode performance as a layer of composite structure, for this reason, in the coating, porosity and material composition and other process selection should be improved. Through the layering technology, the ratio of cathode materials of lithium ion battery is more reasonable, and the amount of charge that can be accepted by cathode materials is greatly improved.
EnviaSystems, the company working with the California chemists to develop the technology, has developed a battery with a specific capacity of 300Wh/kg, which the company hopes to increase to 400Wh/kg through improvements in cathode materials. In the case that the charge of the negative electrode is greater than that of the positive electrode, the enhancement of the capacity of the battery depends on the material of the positive electrode, which is a big advantage of the existence of manganese rich layering technology. Through this technology, real high-capacity lithium-ion batteries can be produced theoretically.
Lithium ion battery, since the 1990 s commercialization application in small portable devices has been a huge success, but with power lithium batteries and energy storage battery to a major application requirements for the next generation of lithium ion battery, to meet safety, environmental protection, the basic conditions, such as cost, life requires a higher energy density and fast charge and discharge capacity. LiCoO2, Li2MnO4 and LiFePO4 with olidine structure are the important cathode materials for lithium ion battery that have been widely used at present. The specific capacity is below 170mAh/g, which is related to the carbon negative electrode stabilized at more than 350mAh/g. The low energy density of cathode materials has become the bottleneck to further improve the energy density of lithium ion batteries, and it is urgent to develop new cathode materials with higher capacity. The U.S. Department of Energy (DOE) requires the energy density of the next generation of lithium-ion power batteries to reach 300Wh/kg, which is more than twice the energy density of current lithium-ion batteries in practice. Cathode material is the core and key of lithium-ion battery technology, which determines the performance and cost of lithium-ion battery.
In this paper, the novel nonclassical crystallization theory and method are applied to the preparation and assembly process of cathode materials. Based on temperature field, pressure field and solvent field to change the solvation effect of metal ions, a new design method and large-scale preparation technology for high energy density lithium ion battery cathode materials for application were established. This report from ascending the anode materials of high specific capacity and working voltage is introduced nickel ternary material, rich lithium manganese base material and high potential energy ratio such as nickel and manganese acid lithium anode material medium scale structure design, preparation and properties of regulating the development progress, to apply them to the next generation of lithium ion battery supply theoretical basis and experimental basis.