What is the lithium iron phosphate batteries, the advantages and disadvantages of lithium iron phosphate batteries
the telecoms industry's vigorous development promote the continuous development of the Internet production expansion, various communication equipments continuously increased, the lithium iron phosphate batteries used in the communications industry, lithium iron phosphate battery although into the communications industry has been a long time, is a household name! A lot of people for the lithium iron phosphate battery is still don't know, what we see today is the lithium iron phosphate batteries, the advantages and disadvantages of lithium iron phosphate batteries.
what is the lithium iron phosphate battery
a class of lithium iron phosphate battery is lithium battery pack, the battery of the positive electrode is made of iron phosphate production. In new energy electric vehicle general there are two kinds of lithium battery, one is the ternary lithium batteries, the other is the lithium iron phosphate batteries. Ternary lithium battery anode materials manufacturing is the use of three yuan, part of the ternary lithium battery pack anode is the use of nickel, cobalt, manganese production, part of the ternary lithium battery anode is the use of nickel, cobalt, aluminum manufacturing. Ternary lithium battery energy density is more strong, this kind of battery energy density than lithium iron phosphate battery is much higher. But the safety of the lithium iron phosphate batteries better than ternary lithium batteries. Lithium iron phosphate battery will burn at eight hundred degrees Celsius, the ternary lithium battery pack began to burn at two hundred degrees Celsius. The total weight of the ternary lithium battery is lighter, therefore this kind of battery is suitable for car use. The total weight of the lithium iron phosphate battery bigger, type of battery is suitable for pure electric bus. application field is very broad, and used in our daily life smart phones, laptops, electronic products, such as the android tablets with the lithium battery.
the performance of lithium-ion batteries is better, invented the battery for a long time, but it was delayed for a while. The chemical nature very lively, the lithium metal used to manufacture cell is very appropriate. is a rechargeable battery, the battery can be recycled.
the lithium iron phosphate batteries
1. Monomer uniformity is better;
cylindrical lithium battery pack has already established a series of international unified standard specifications and models, the processing technology is mature and perfect, right of uninterrupted change in bulk production
2. Monomer itself material mechanics performance is good,
cylinder specific surface area is large, heat pipe cooling effect is very good, can get high bending strength;
3。 Technology mature and perfect, with low cost
the battery metal case compressive strength is high, the step is not easy to produce such as square, the circumstance such as flexible packaging cells swell
4. Monomer energy is small, multiple small accident risk
cause accidents, form is easy to control, cylindrical battery is usually sealed battery, will not have a maintenance difficulties in the operation the whole steps
the lithium iron phosphate battery defect
1, lithium iron phosphate battery production smart steps are very easy to cause short circuit
in the sintering process of preparing the lithium iron phosphate step, iron oxide reduction of widespread under high temperature and reducing atmosphere of elemental iron. Elemental iron can cause cell micro short circuit, is the most taboo in battery chemistry. This is Japan region has not been the material will be used for the main reason of power type lithium ion battery cathode material.
2, lithium iron phosphate is poorer, widespread some defects
the lithium iron phosphate generally exist some defects in performance, such as vibration compaction density and relative density is low, the energy density of lithium ion battery is low. Low temperature performance is poorer, even if the nano and carbon coating did not solve this difficult problem. Energy storage system the national laboratory center director Dr Donhilebrand when it comes to the low temperature performance of phosphate lithium battery, he used a terible to describe, they test the iron phosphate lithium ion battery, the results show that the lithium iron phosphate battery at low temperature ( Below 0 ℃) Can't open electric car. Although there is also a manufacturer claims that the lithium iron phosphate battery capacity in low temperature retention is good, but it was in the small discharge current and discharge cut-off voltage is very low. In such a case, the equipment can't start the job.
3, lithium iron phosphate battery production cost higher
material preparation cost and battery manufacturing cost is higher, the battery low qualification rate, poor consistency. Lithium iron phosphate nano and carbon coated despite the electrochemical properties of the material, but also brought other problems, such as the lower energy density and synthetic cost increase, electrode processing performance is poor and demanding to the environment problem. Although the lithium iron phosphate chemical elements in the Li, Fe and P is very rich, the cost is low, but could be prepared for the lithium iron phosphate production cost is not low, even get rid of the early scientific research and development costs, the process of the material cost and high cost of batteries, will make the final unit cost of energy storage battery is higher.
4, poor product consistency.
at this stage is not a domestic lithium iron phosphate material factory can solve this problem. From the point of the material preparation, the synthetic reaction of the lithium iron phosphate is a complex multiphase reaction, solid phosphate, iron oxide and lithium salt, plus a phase carbon precursor and reduction of chi. In this complex reaction steps, it is difficult to ensure consistency of response.
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