At the beginning of August, the media reported that after interviewing BYD Chairman Wang Chuanfu about lithium iron manganese oxide cathode materials at the work conference of the New Energy Automotive Industry Tri-building Project held in Shaoshan, Hunan, it caused major securities newspapers, websites and brokerages, and industry hot. In the past week, the amount of news reached hundreds of media reports, hundreds of articles, and also attracted great attention in the capital market. Is the lithium battery energy density really increased? In the end is lithium iron phosphate or lithium iron phosphate manganese lithium line? Will the ternary material change? To this end, the media interviewed Dr. Fan Weifeng, Ph.D., director of the Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, and Chengdu Xingneng New Materials Co., Ltd.
Lithium iron phosphate is not alone
Dr. Fan Weifeng believes that lithium iron phosphate is a complex phosphate formed from lithium and another metal ion, similar to chemical fertilizers (ammonium dihydrogen phosphate, ammonium iron phosphate, etc.) sold on the market, but its solubility is different, so It is said that lithium iron phosphate fertilizer can be used for phosphate fertilizer, but in fact, lithium iron phosphate is very poor solubility, can not release the effective phosphorus component into the soil.
According to Fan Weifeng, because phosphate has more oxygen ions and coordination space, it is often possible to form interconnected, space-linked structures with transition metal ions, so this type of ions belongs to another major class—polyanion compounds (polyanions). Cathode material).
Polyanion positive electrode is a huge family
According to Dr. Fan Weifeng, M stands for any metal element such as iron, manganese, cobalt, nickel, copper, chromium, etc. previously replaced, as long as M is a variable metal, and the above compounds have a stable structure, and the lithium ion diffusion channel can be used as a lithium battery. Positive electrode material, but different capacity, different voltage, different rate performance, different life span...
Phosphoric acid - ferromanganese lithium or iron manganese lithium?
Dr. Fan Weifeng believes that any kind of address does not matter. The key is the final proportion of iron and manganese. At present, there is no clear consensus about similar ternary materials (532, 111, 811, etc.)—how large is the proportion of iron and manganese? What is the best? Because no stable, good-performance lithium iron manganese phosphate has yet been made, lithium manganese iron phosphate, which may be used in the future, is a composite phosphate of more metals.
Is the authenticity of technology true?
Lithium iron phosphate theoretical capacity 170mAh / g, discharge platform 3.4V, material energy density is 578Wh/kg; lithium manganese phosphate theoretical capacity of 171mAh / g, discharge platform 4.1V, material energy density is 701Wh / kg, higher than the former twenty one%.
Dr. Fan Weifeng introduced to China Battery Network that the energy density of existing lithium iron phosphate batteries is between 90Wh/kg and 130Wh/kg. According to the contribution of energy density of 21% of the material, even the pure lithium manganese phosphate, the highest The energy density can only reach about 150Wh/kg, and the energy density of lithium manganese phosphate battery can only be less than 150Wh/kg. If the best indicator (150Wh/kg) is used to compare with the worst indicator (90Wh/kg) of existing lithium iron phosphate battery, we can infer that the maximum increase rate is 67%, but obviously this hypothesis can only be an assumption. .
Analysis of BYD Lithium Manganese Phosphate
Dr. Fan Weifeng stated that BYD's technical and strategic change is more
The authenticity of technological innovation, or BYD will gradually put forward some new ideas, ideas, trying to continue to lead the direction of development of the industry; but whether or not they will deny their own identified lithium iron phosphate technology line, BYD, but there are two directions: (1 ) The persistence of the lithium iron phosphate model was gradually eroded in the new energy industry and abandoned, as did Bick's inability to complete. (2) Actively reserve new routes, announce their true ideas at the right time, and implement rapid technological transformation based on their own strong R&D team to achieve the second industrial victory.
Dr. Fan Weifeng’s opinion on Wang Chuanfu’s interview with China Battery Network “and we chose LiFePO4. These elements are very rich on Earth and there will be no day of exhaustion. Therefore, we consider economically. Of course, with the constant development of battery technology, we may also choose other technical routes." In other words, BYD can not be a route to the black!
Different voices in the industry
Sound 1: The progress of the lithium iron manganese phosphate technology is positive, but with a bit of flicker, no Wang Chuanfu said so well. 90Wh/kg is relatively poor in lithium iron phosphate batteries, and 150Wh/kg is the best performance that a new generation of lithium iron manganese phosphate products can achieve, taking the best of the oldest and newest products, There are more eye-catching effects on the data.
Voice 2: When ferric manganese manganese phosphate is produced, we don't know either, because we are not BYD people either, but the international leader, such as PHOSTECH, already has the capacity of manganese ferromanganese phosphate material. Trane has also been mass-produced for a long time.
Sound III: Manganese iron lithium iron phosphate material has two voltage platforms, analysis of the corresponding manganese and iron redox, if you want to replace the lithium iron phosphate battery, the battery system should be slightly improved, but it is estimated that not too much. The preparation process of this material will not be much different from that of lithium iron phosphate. It is estimated that the technology for making a battery is similar, and the promotion prospects should also be acceptable.
Sound 4: Lithium manganese phosphate is an upgraded version of lithium iron phosphate, which has certain advantages over iron lithium. I just made lithium iron manganese phosphate, this thing has hope, but it is not so easy to do.
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