Recently, the technology of BYD lithium ferromanganese manganese has been talked about. In the patent inquiry system of the State Intellectual Property Office, it is also possible to find a patent registered by BYD Company that combines iron manganese manganese phosphate and graphene with two swords, which looks quite powerful. The writer, who is always aware of the situation, still has an online article on Baidu. I found an article with a high rate of reproduction. The author would not say anything about it. There is a sentence like this: "It is reported that BYD's new lithium iron manganese phosphate battery technology can increase the battery capacity from the original 90WH/Kg to 150WH/Kg, its energy density level has reached the density of ternary materials."
When I saw this sentence, I couldn't help but lament that the word “battery pack capacity†was so wonderful that people couldn’t pick the wrong thing. Why did you say this? When I was bored, I did a simple set of calculations:
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%. From the capacity point of view, the capacity of the two materials is basically similar, the difference is only that the latter has a higher discharge voltage platform, so the energy density of the battery should be able to have a 20% increase. Currently, BYD's lithium iron phosphate battery has an energy density of about 130 Wh/kg, so the lithium iron manganese phosphate battery can, of course, reach 156 Wh/kg. Humble says that it can indeed reach 150 Wh/kg.
Lithium iron phosphate battery
Then 90Wh/kg of the source, I see some people comment that this is BYD's previous product parameters. At first glance, the author also think so. However, after thinking about it, I felt a bit wrong. In addition to Tesla's direct use of the 18650 battery, the battery of an electric car is generally used in groups of batteries, which is often referred to as Pack. According to the current product specifications, if the cell energy density is 130Wh/kg, the capacity density of 90Wh/kg after group formation is still reliable. Therefore, I believe that this 90Wh/kg refers to the energy density of the current BYD battery pack, and the latter 150Wh/kg refers to the energy density of BYD's new material batteries, but the latter attribute is omitted. Under such word games, people have the illusion that their energy density has increased by 60%, and people feel that they have used new batteries, and their cruising mileage may have doubled....
This reminds me of the scene when BYD “Iron Battery†was introduced in 2007. The old thing does not mention that although the technical packaging is possible, the speculation of stealing the concept is a little uncomfortable.
In spite of this, BYD’s achievements in intellectual property in recent years are still worthy of recognition. The number of patents is also a leader in domestic battery companies. The prosecution of foreign companies, dare to respond to even prosecution, also made BYD famous in the industry. With the new lithium iron manganese phosphate battery technology, it is currently in the public stage and it is believed that it will be authorized soon. How is this technique, I'm not sure. However, I still want to think about this new material with my own shallow understanding.
First of all, I want to first understand what the patent is? The patent is an Idea, a novelty, creative, practical technical solution. In the author's experience, the formulation formula seems to be easier to patent. According to the author's usual phrase: "Most of the patents and products are very close and far away." Conservatively speaking, an Idea, successful implementation in the laboratory, can apply for a patent. Therefore, the patent is very important and it represents the direction. At present, this technology is in the laboratory stage, pilot scale up stage, trial production stage or mass production stage. In addition to BYD himself, no one else knows. We hope that the relevant products will be listed as soon as possible, and let people take a closer look.
Second, in the BYD patent, graphene that has been "demonized" has appeared again. It seems that graphene has been added, and the battery's specifications will increase. The author talks about his understanding of this material. In general, graphene, as a new type of two-dimensional material, is characterized by a large specific surface area. This means that after using this material, the area where the electrochemical reaction takes place increases. In other words, more electrolytes can simultaneously react electrochemically. At this time, from the apparent appearance of the battery, the battery can be used more. Current charge and discharge. That is, the power characteristics of the battery increase. Therefore, many reports of super batteries using graphene materials are characterized by rapid charge and discharge. Due to the large specific surface area of ​​graphene, its density is lower than that of other materials. We know that the energy density of a battery has a great relationship with the compaction density of a material. Therefore, after using graphene, the energy density of the battery is not only difficult to increase, but its energy density may also decrease when the usage amount is large. Of course, I believe that there must be technical means to weigh the contradiction between power and energy, but from the perspective of the principle, graphene is not a panacea. Besides its own many problems that need to be solved, its use effect is also a double-edged sword. .
Again, this new material should improve battery performance. According to the information currently available to the author, the most optimistic estimate may be that the energy density can be increased by about 20%. Progress must be worthy of recognition, but there is still a certain distance from the requirements of the market. In fact, the author thinks that it is more important to pay attention to whether the cost of the product increases after manganese is added, whether the consistency can be ensured, and whether the cycle life has an effect on this type of real problem, which may be more important than the energy density at that point. . Good materials will only make users feel good if they want to fully experience them. However, if there are no one who can use them because of cost and security issues, what is the significance of this “good� This is like a football match. If you want to shoot, you must first qualify for playing.
Finally, I want to talk about my understanding of the battery. The electrode material is very important for the battery. It can be said to be the heart of the battery. But does not mean that light has a good heart and can solve all the problems? The answer is definitely negative. The battery is small and fully-equipped. The electrode material is only one of the key materials of the battery. At the same time, good formulas must also have good processes to achieve. Even if the monomer is good, what about the performance after series-parallel connection? The group performance is largely determined not by the monomers themselves, but by the consistency of the monomers.
One day, while chatting with a colleague about the prospect of lithium ferromanganese phosphate, the author laughed: How much can it be raised? Not to mention lithium iron manganese phosphate, even if the iron are replaced with manganese, manganese phosphate, lithium, performance is like that! It may be very arbitrary to say so, but the best effect of this composite material is to make up for the fatal flaw of a single material, and it is difficult to amplify the advantages of a single material.
Returning to the original point of the article, "The new lithium iron phosphate manganese battery technology developed by BYD can increase the battery capacity from the original 90WH/Kg to 150WH/Kg, and its energy density level has reached the density of ternary materials." The reason why it has become a hot spot in the future is to achieve the performance of lithium cobalt oxide at a lower cost in the future. The iron phosphate manganese lithium can only achieve the performance indicators of the current ternary materials. The author suddenly felt that this was a very interesting formulation. It was a bit like "The Eagle-Fighting Heroes" in "The Millennium". He said that he was the best in the world, but when will the "Five" experience take him seriously? The comparator is the reality, and the compared person is the future direction. The author YY, perhaps this comparison, is also BYD acquiesced ternary material in the future more hopeful. Maybe one day, BYD will release its own ternary material.
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