Why is the proportion of ferromanganese in lithium iron manganese phosphate causing discussion?

Lithium iron phosphate is not alone

Dr. Weifeng Fan believes that lithium iron phosphate is a complex phosphate formed by lithium and another metal ion, similar to the chemical fertilizers sold on the market (ammonium dihydrogen phosphate, ammonium ferric phosphate, etc.), but the solubility is different, so It has been said that the ferric phosphate lithium fertilizer can be used as a phosphate fertilizer, but in fact, lithium iron phosphate has extremely poor solubility and cannot release an effective phosphorus component into the soil.

Weifeng Fan introduced that phosphate has a large number of oxygen ions and coordination space, so it can often form a spatially connected structure with transition metal ions. Therefore, such ions belong to another large class—polyanion compounds (polymerization). Anion cathode material).

Polyanion cathode is a big family

Dr. Weifeng Fan introduced that M stands for any metal element such as iron, manganese, cobalt, nickel, copper, chromium, etc., as long as M is a variable-valent metal, and the above compounds are structurally stable, and lithium-ion diffusion channels can be used as lithium batteries. Cathode material, but different capacity, different voltage, different rate performance, different life...

Phosphoric acid - ferromanganese or lithium manganese oxide

Dr. Weifeng Fan 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 on similar ternary materials (532, 111, 811, etc.) - the ratio of iron and manganese is How big is the best? Because there is no stable, good performance lithium iron phosphate, the lithium manganese iron phosphate that may actually be used in the future is a composite phosphate of more metals.

Whether technology authenticity is true?

Lithium iron phosphate theoretical specific capacity of 170mah/g, discharge platform 3.4 V, material energy density is 578wh/kg; Lithium manganese phosphate theoretical specific capacity is 171mah/g, discharge platform 4.1 V, material energy density is 701wh/kg, 21% higher than the former.

Dr. Weifeng Fan introduced the Chinese battery network. The energy density of the existing lithium iron phosphate battery is between 90Wh/kg and 130Wh/kg, which is contributed by the energy density increase of 21% of the material. Even the pure lithium manganese phosphate is the highest. The energy density can only reach 150Wh/kg, and the energy density of the battery using lithium manganese iron phosphate can only be below 150Wh/kg. If you compare the worst indicator of the existing lithium iron phosphate battery (90Wh/kg) with the best expected indicator (150Wh/kg), you can infer that the maximum increase is 67%, but obviously this assumption can only be a hypothesis. .

The analysis of BYD manganese lithium iron phosphate

Dr. Weifeng Fan said that BYD's technical and strategic pursuit of authenticity> the authenticity of technological innovation, perhaps BYD will gradually propose some updated concepts and viewpoints, trying to continue to lead the development direction of the industry; but whether or not it will deny its identified phosphoric acid The iron-lithium technology route, BYD has two directions: (1) adhere to the adhered lithium iron phosphate model, gradually aging in the new energy industry, and abandoned, as Bick is unwilling to complete the course. (2) Actively reserve new routes, announce their true ideas at the right time, and achieve rapid technological transformation based on their own strong R&D team to achieve the second industrial victory.

Dr. Weifeng Fan’s opinion on Wang Chuanfu’s interview with China Battery Network “and we chose lithium iron manganese phosphate, these elements are very rich on the earth, there will be no depletion day, so we have chosen from the economic point of view. Of course, with the continuous development of battery technology, we may also choose other technical routes" - obviously there is a string of sound. That is to say, BYD is not likely to go black in one route!

Industry of different sounds

Voice 1: manganese lithium iron phosphate technology is progressive, but with a little fool, not as good as Mr. Wang says 90wh/kg in iron phosphate the lithium battery is relatively poor, in the 150wh/kg is a new generation of ferromanganese lithium phosphate products can achieve a better performance, and the worst in the old and the new product in the best ratio, more eye-catching effect on data.

Voice 2: When is the energy production of lithium iron manganese phosphate, we don't know, because we are not BYD people, but the international leading manufacturers, such as PHOSTECH, have the capacity of lithium manganese phosphate material, Tianjins Tran has also been mass-produced in tons.

Voice: three ferromanganese lithium phosphate material platform, there are two voltage analysis corresponding to the REDOX of manganese and iron to replace batteries, lithium iron phosphate battery system is a little improvement, but not too big. Preparation of the materials and the difference is not too big, lithium iron phosphate estimate battery technology is also similar, should also can promotion prospects.

Voice 4: Lithium iron phosphate is an upgraded version of lithium iron phosphate, which has certain advantages over iron lithium. I am doing lithium manganese iron phosphate. This thing has hope, but it is not so easy to do.

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