1. Structural difference: The positive active materials in lithium-manganese-iron-phosphate batteries and lithium-iron-phosphate batteries are both phosphates. The difference between them is that the materials of the positive electrodes are different. The cathode materials of lithium-manganese-iron-phosphate batteries are lithium-manganese and lithium-iron-phosphate, while the cathode materials of lithium-iron-phosphate batteries are lithium-iron-phosphate.
2. Energy density: The energy density of lithium iron phosphate batteries is slightly higher than that of lithium iron manganese phosphate batteries, but the lifespan of lithium iron manganese phosphate batteries is longer, up to about 3 times. , and is more stable and durable.
3. Safety: Lithium iron phosphate batteries pose some safety risks due to the unstable chemical properties of bed manganatehium; while the chemical properties of lithium iron phosphate batteries are relatively stable and are not sensitive to temperature changes. current, etc. The adaptability is also stronger, and it is safer and more stable.
4. Charging performance: The lithium iron manganese phosphate battery has good high-rate charging performance, that is, it can charge quickly; while the high rate charging of lithium iron phosphate battery is relatively low.
Which is more expensive, a lithium iron phosphate battery or a lithium manganate battery?
Lithium iron phosphate batteryOkay, lithium ion battery or iron phosphate battery Lithium batteries each have their own merits, and the technology is neither good nor bad, only suitable or inappropriate. It is best to choose the lithium battery that suits you.
Lithium iron phosphate battery.
The so-called lithium iron phosphate battery refers to a lithium-ion battery using lithium iron phosphate as the positive electrode material. The particularity of this type of battery is that it does not contain precious metal elements (such as cobalt, etc.).
In actual use, lithium iron phosphate batteries have the advantages of high temperature resistance, high safety and stability, low price and better cycle performance . The price of raw materials is low and the earth's phosphorus and iron resources are abundant, so there will be no supply problems.
The advantages of lithium iron phosphate batteries are that they are safe to use.
The PO bond in the lithium iron phosphate battery crystal is stable and not easy to decompose. Even at high temperatures or in case of overload, the structure does notwill not collapse or heat up, or form strong oxidizing substances such as lithium cobalt oxide. has good security.
Lithium iron phosphate batteries have undergone strict safety testing and will not explode even in the event of a collision or puncture.
With the improvement of service life, the service life of lithium iron phosphate batteries reaches more than 2,000 times. With a standard charge (5 hour rate), it can reach 2000 times.
Lead-acid batteries of the same quality only last 1-1.5 years at most, while lithium iron phosphate batteries have a theoretical lifespan of 7-8 years when used under the same conditions.
High temperature performance is good. The thermal peak of lithium iron phosphate battery can reach 350℃-500℃, while lithium manganate and lithium cobalt oxide are only about 200℃. It has a wide temperature rangeoperating temperatures (-20°C to 75°C) and has high temperature resistance.
With large capacity, if the battery is often fully charged and not fully discharged, the capacity will quickly drop below the rated capacity. This phenomenon is called memory effect.
Ni-MH and nickel-cadmium batteries have memory, but lithium iron phosphate batteries do not have this phenomenon. Regardless of its condition, you can charge it and use it at any time. There is no need to discharge it first and then recharge it.
Lightweight, the volume of a lithium iron phosphate battery with the same specifications and capacity is 2/3 that of a lead acid battery, and its weight is 1/3 that of a lead acid battery. battery.
Environmentally friendly, lithium iron phosphate batteries do not pollute, comply with European RoHS regulations and are certified as absolute batteriesgreen and environmentally friendly.
Fast charging, it can quickly charge and discharge at a high current of 2C. The battery can be fully charged in 40 minutes with a special charger at 1.5C, and the starting current can reach 2C.
Disadvantages of lithium iron phosphate batteries:
1. The plug density of the positive electrode of lithium iron phosphate batteries is low, and the density is generally around 0.8 to 1.3. Big size.
2. The conductivity is poor, the lithium ion diffusion speed is slow, and the actual specific capacity is low when charging and discharging at high times.
3. Lithium iron phosphate batteries have poor performance at low temperatures.
4. The life of a single lithium iron phosphate battery is long, about 2,000 times, but the life of a lithium iron phosphate battery is short, generally about 50 times.0 times.
What is the difference between lithium manganate and lithium iron phosphate batteries?
Lithium manganese batteries are expensive.
First of all, in terms of raw materials, lithium iron phosphate batteries use a large amount of iron, while lithium manganese batteries use a large amount of lithium. In terms of price, lithium iron phosphate batteries are cheap, while lithium manganese batteries are expensive. In terms of performance, the biggest advantage of lithium iron phosphate batteries is their high temperature resistance, while lithium manganese batteries are not so good.
3.4V is a lithium iron phosphate battery
1. Lithium iron phosphate batteries are used to manufacture lithium-ion secondary batteries. Now the main direction is electric batteries, compared to Ni-. H, lNi-Cd batteries have great advantages.
2. Lithium battery is a type of battery that uses lithium metal or lithium alloy as the positive electrode material and uses non-aqueous electrolyte solution. The chemical properties of lithium metal are very active, which makes the processing, storage, use and environmental requirements of lithium metal very high.
3. Lithium iron phosphate batteries will not catch fire or explode like lithium batteries will.
4. Lithium iron phosphate resists overcharging and will not catch fire or explode up to 100%. The lithium battery will inflate when it reaches the specified value.
3.4 VIt is a lithium iron phosphate battery. The safety of lithium manganate batteries is between ternary lithium batteries and lithium iron phosphate batteries, so 3.4V is a lithium iron phosphate battery. The voltage of lithium manganese oxide battery is higher, reaching 3.9V, that of lithium iron phosphate battery is 3.4V, and that of ternary lithium battery is 3.7V.
High voltage means the battery PACK can use fewer cells. The lithium manganate battery pack not only can reduce the cost by installing fewer cells, but also has a size advantage. The cost of the PACK is significantly lower. than that of ternary lithium or lithium iron phosphate battery.
Charging and discharging principle of the battery
The charging and discharging reaction of the lithium iron phosphate battery is between the LiFePO4 and FePO4. During the charging process, LiFePO4 gradually separates from the lithium ions to form FePO4. During the discharge process, lithium ions are integrated intoFePO4 to form LiFePO4.
When the battery is charging, lithium ions migrate from the lithium iron phosphate crystal to the crystal surface, under the action of the electric field force, they enter the electrolyte, and then cross the separator and. then migrate to the surface of the graphite crystal through the electrolyte and then integrated into the graphite network.
At the same time, electrons flow to the aluminum foil collector of the positive electrode through the conductor, flow to the copper foil current collector of the negative electrode of the battery through the tab, the positive pole of the battery. , the external circuit, the negative pole and the tab of the negative electrode, then it passes through the conductor to the negative graphite electrode to balance the charge on the negative electrode. Once the lithium ions are deintercalated from the lithium iron phosphate, the lithium iron phosphate is converted inton iron phosphate.