A new generation of lithium ion battery anode materials for lithium manganese phosphate development research

Source: 2020 - 04 - 05 22:54 hits: a new type of olivine structure of phosphate system security performance and cycle life of anode materials are superior to the traditional hierarchical structure anode material, Such as acid lithium cobalt acid lithium, nickel, ternary material) On behalf of material lithium iron phosphate ( Lithium iron phosphate) Has been widely research by academia and industry, confirm and a large number of applications in the field of power and energy storage battery, etc. But 3 lithium iron phosphate. 4 V ( vs。 Li/Li+) Potential limit the battery energy density increase, so the development of the lithium iron phosphate battery market is restricted. With the lithium iron phosphate ( 磷酸铁锂) Compared to lithium manganese phosphate ( LiMnPO4) With 4. 1 v theory of high voltage, capacity of basically the same. Under the condition of same capacity, manganese phosphate lithium battery energy density will be about 20% higher than the lithium iron phosphate batteries. Thus, lithium manganese phosphate ( LiMnPO4) Is listed as a new generation of high energy density dynamic lithium ion battery anode materials. Predictably, once the lithium manganese phosphate materials research and development of a breakthrough, not only can grab the market share of the lithium iron phosphate, can squeeze manganese acid lithium and ternary material market space, to break the current market pattern of positive electrode materials. 2 lithium manganese phosphate ( LiMnPO4) Production process at present, the manganese - Lithium phosphate material is still in the research and development, and has not been applied in large-scale battery, failed to find a suitable low cost is mainly due to the high-performance manganese - mass production methods to solve Lithium phosphate material problem. However, compared with lithium metal, its high potential value of 4. 1 v, capacity of more than 162 mAh/g, lithium iron phosphate ( 磷酸铁锂) Material relative to the potential value of metallic lithium is only 3. 4 v. Compared with LiFePO4, LiMnPO4 potential increased 0. 7 v, so as a new generation of positive electrode materials has received the widespread attention. LiMnPO4, however, the electrical conductivity of 3 most of the order of magnitude lower than the conductivity of LiFePO4, therefore multiplier performance is poorer, difficult for high output power. Ningbo material power and energy storage battery technology China team through a lot of technology research and exploration, has solved the poor electronic conductivity of lithium manganese phosphate material bottlenecks and lithium ion diffusion rate is low, the development of high-performance lithium manganese phosphate materials, low cost large scale preparation technology and the development of corresponding technology. The development of lithium manganese phosphate materials 18650 cylindrical battery discharge capacity is 1100 mAh, discharge voltage of about 3. 9 v, than the same type of lithium iron phosphate battery has 20% higher energy density. New battery also has a good cycle life, high discharge rate, low temperature performance and safety performance. 1 c at room temperature under circular 150 weeks, battery capacity is not decreased obviously. 40 c high-magnification continuous discharge of battery discharge capacity is 90% of the 1 c, - 0 to 20 ℃. 2 c discharge capacity for 97 at room temperature. 6%. Even in - 40 ℃, the battery discharge capacity can reach 61. 5%. In addition, the battery also successfully passed the 3 c ~ 10 v overcharge and breakdown test safety tests, no explosion, no combustion, no smoke. Experimental data show that the new material and application and development of the basic power and energy storage battery, the feasibility of the material and manganese phosphate fill the blank of lithium manganese phosphate lithium-ion battery technology in China, break the monopoly of foreign technology, will be conducive to the development of China and the international competitive power lithium-ion battery technology. Overseas research progress of lithium manganese phosphate is the Pacific northwest national laboratory in richland, Washington state ( PNNL) The researchers. The company has developed a technique that can be a potential electrode material is not usually to store electrical energy is converted into a similar battery material can store more energy than the market materials. When lithium manganese phosphate grow in new technology, will form a small dish. These disks can charge and lithium ion conduction, make them become a useful storage materials. Researchers in the United States Pacific northwest national laboratory in the journal nano letters, according to a paper published solid paraffin and oleic acid manganese - The growth of lithium phosphate layered nanostructures.