The technological development route of lithium cobalt oxide batteries and ternary 18650 lithium battery cells

　　Lithium battery manufacturers analyze the technological development routes of lithium cobalt oxide batteries and ternary 18650 lithium battery cells. Nickel-cobalt-manganese ternary material is a new type of lithium-ion battery cathode material developed in recent years. It has the advantages of large capacity, good cycle stability, and moderate cost. Because this material can effectively overcome the high cost of lithium cobalt oxide materials at the same time. At present, ternary material batteries have replaced the previously widely used lithium cobalt oxide batteries and are widely used in the field of notebook batteries. Next, lithium battery manufacturers analyze the technological development routes of lithium cobalt oxide batteries and ternary 18650 lithium battery cells.

　　Lithium cobalt oxide battery technology development route

　　After long-term development, lithium cobalt oxide batteries have formed four product lines: cylindrical batteries, polymer pouch batteries, aluminum shell batteries and steel shell batteries. These products are used in high-end, mid-range and low-end markets respectively.

　　Lithium cobalt oxide was the first to be commercialized due to its simple production process and stable electrochemical performance. It has the advantages of high discharge voltage, stable charge and discharge voltage, and high specific energy. It has important applications in the field of small consumer product batteries. Due to consumer products With the rapid development of the electronic product market, lithium cobalt oxide is the material with the largest sales volume among lithium battery cathode materials. However, it has high cost, is not conducive to environmental protection, has low specific capacity utilization, short life of 18650 lithium battery cells, and poor safety. The ternary material combines the advantages of lithium cobalt oxide, lithium nickel oxide and lithium manganate and has a price advantage. However, its application is affected by the price of cobalt. When the cobalt price is at a high level, the price of the ternary material is higher than that of lithium cobalt oxide. Low, it has strong market competitiveness; but when the price of cobalt is at a low level, the advantages of ternary materials compared to lithium cobalt oxide are greatly reduced. At present, there is a general development trend of lithium cobalt oxide materials being replaced by ternary materials.

　　The high-density synthesis process around 2000, by increasing the sintering temperature and sintering times of lithium cobalt oxide, synthesized single crystal primary grains of more than ten microns, and increased the compacted density of lithium cobalt oxide electrode to 4.0g/ cm3 or above, the birth of the second generation of lithium cobalt oxide has attracted more attention for its application in the small battery market. In order to adapt to the development of the times, lithium cobalt oxide must also be gradually updated. Most lithium-ion battery cathode materials need to increase their energy density. However, there is a lot of room for improvement in energy density of lithium cobalt oxide. In order to improve this performance, it is necessary to Modification of lithium cobalt oxide mainly focuses on these two aspects: one is to make the lithium cobalt oxide powder particles larger and achieve single crystallization to increase the compaction density of the material and thereby increase the energy density; the other is to The material is doped and surface-coated with inert materials to improve the discharge voltage and cycle performance of the material to increase energy density. To this end, lithium cobalt oxide will adapt to changes in the times, increase energy and density, keep pace with the times, and maintain its C position in 3C product applications.

　　Technical development route of ternary lithium battery pack

　　As governments around the world continue to strengthen their environmental awareness, the new energy industry has attracted much attention, and governments have continuously introduced relevant policies to support it. For example, the U.S. government, as a leader in the global new energy economy, continues to develop the new energy automobile industry. The application and popularization of smartphones, tablets, wearable smart devices, mobile power supplies, new energy vehicles, electric bicycles, power tools and energy storage power stations will bring unprecedented development opportunities to the lithium-ion battery industry. Global lithium-ion batteries The market will continue to maintain steady growth.

　　From a global perspective, all parties are constantly advancing the research and development and production of ternary materials. In this process, the material properties have been greatly improved and the application fields have been repeatedly expanded. Japanese and Korean companies are leaders in the research and development of ternary material batteries. Domestic ternary material production started around 2015, and many large-scale enterprises have emerged. Ternary materials have excellent properties such as high capacity, low cost, and good safety, and have good development prospects in the field of power lithium batteries. Taking advantage of the advantages of high energy density and relatively low cost of ternary materials, in the next 3 to 5 years, ternary materials will become mainstream in power batteries, and high-end ternary material power batteries will be in short supply.

　　Judging from the current development trend of power batteries, on the one hand, it can be basically determined that the development direction of power batteries is lithium-ion batteries; on the other hand, the research and development direction of power batteries is being promoted jointly by multiple lines. Although power batteries are in a state of "letting a hundred flowers bloom" on the technical roadmap, the competition for the mainstream market has been going on for a long time, and it is not yet known who will win.

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