Does lithium iron phosphate battery have safety?

The advantages of lithium iron phosphate batteries are:

Lithium iron phosphate batteries have a long life and a cycle life of more than 2,000 times. Under the same conditions, lithium iron phosphate batteries can be used for 7 to 8 years.

Use safe. Lithium iron phosphate batteries undergo rigorous safety tests and do not explode even in traffic accidents.

Charge fast. Use a dedicated charger, 1.5 C charging 40 minutes can make the battery full.

Lithium iron phosphate batteries are resistant to high temperatures, and the thermal wind value of lithium iron phosphate batteries can reach 350 to 500 degrees Celsius.

Lithium iron phosphate batteries have a large capacity.

Lithium iron phosphate batteries have no memory effect.

Lithium iron phosphate batteries are green, non-toxic, non-polluting, and have a wide range of raw materials and cheap prices.

The disadvantages of lithium iron phosphate batteries are:

Lithium-iron phosphate batteries have a small vibration density and a density of about 0.8 to 1.3. Large size.

The electrical conductivity is poor, the diffusion speed of lithium ions is slow, and the actual specific capacity is low when the charge and discharge is high.

The low temperature performance of lithium iron phosphate battery is poor.

Lithium-iron phosphate cells have a long life span of about 2,000 times, but lithium iron phosphate batteries have a short life span of about 500 times.

The lithium iron phosphate electrode material is mainly used in various lithium ion batteries. Since 1996, when Japan's NTT first exposed the lithium-ion battery positive material of the olivine structure of AyMPO 4(A is alkaline metal, M is a combination of both: LiFeCoPO4), in 1997, Texas State University John. B. Goodenough and other research groups, it is also reported that the reversibility of LiFePO4 moves into and out of lithium.

The United States and Japan published the olivine structure (LiMPO4) in agreement, which made the material highly valued and caused extensive research and rapid development. Compared with the traditional lithium ion secondary battery positive electrode material, the spinel structure LiMn2O4 and the layered structure LiCoO2, the raw materials of LiMPO4 are more extensive, cheaper and free of environmental pollution.

The application of lithium iron phosphate mainly includes:

(1) Energy storage equipment

Energy storage equipment for solar energy and wind power generation systems, UPS system, and solar cell use as energy storage equipment (BYD is already producing such batteries);

(2) Types of power tools

High-power electric tools(wireless), electric drills, lawnmowers, etc.

(3) Light electric vehicles

Electric locomotives, electric bicycles, recreational vehicles, golf carts, electric pushers, cleaning vehicles, hybrid vehicles (HEV), recent 2-3 years of targets;

(4) Small equipment

Medical equipment: electric wheelchair car, electric scooter), toys (remote-controlled electric aircraft, car, boat);

(5) Other small appliances

Miner's lamp, implantable medical device (lithium iron phosphate is non-toxic, lithium battery can only meet the requirements of iron and lithium), replacing lead acid, nickel hydrogen, nickel cadmium, lithium cobalt, lithium manganese battery in small appliances.

(6) Mobile power supply

After long-term research, Deboch, a German energy company, successfully developed and mass-produced lithium iron phosphate batteries for composite nanomaterials, which increased the unit capacity ratio and overcome the problem that lithium iron phosphate is too large per unit volume and is not suitable for digital products. Now a single 32650(32mm in diameter and 65mm in length) size battery has a capacity of more than 6,000 mAh. Through two sections, it can reach 12,000 mAh. Mobile power is 38.4 Wh, enough to charge 5.3 Wh(1432mAh) iPhone 4S nearly six times, suitable for users who travel long distances outdoors.

High energy density

Its theoretical specific capacity is 170mAh/g, and the actual specific capacity of the product can exceed 140mAh/g (0.2 C, 25 °C);

Security

It is currently the safest lithium ion battery cathode material; Does not contain any heavy metal elements that are harmful to the human body;

Long life span

Under 100 % DOD conditions, you can charge and discharge more than 2,000 times; (Reason: The stability of the lithium iron phosphate lattice is good, and the embedding and deactivation of lithium ions have little effect on the lattice, so it has good reversibility. The deficiency is that the electrode ion conductivity is poor, and it is not suitable for large current charging and discharging, and it is blocked in application. Solution: The electrode surface is coated with conductive materials and doped for electrode modification.))

The service life of lithium iron phosphate battery is closely related to its service temperature, and its low or high service temperature has great negative potential in its charging and discharging process and use process. Especially used in electric vehicles in northern China, lithium iron phosphate batteries can not supply electricity normally or their power supply is too low in autumn and winter, and their working environment temperature needs to be adjusted to maintain their performance. At present, it is necessary to consider the space limitation problem to solve the temperature environment of lithium iron phosphate batteries. The more common solution is to use aerogel felt as a thermal insulation layer.

Charging performance

Lithium batteries of lithium ferric phosphate positive electrode materials can be charged at a high rate and the battery can be filled within 1 hour as soon as possible.

Specific physical parameters:

Loose density: 0.7 g/cm3

Vibration density: 1.2 g/cm3

Medium diameter: 2-6um

Specific surface area <30m^2/g

Piece parameters:

LiFePo 4: C: PVDF = 90:3:7

Polar compaction density: 2.1-4 .4 g/cm3

Electrochemical performance:

G capacity & GT; 155mAh/g Test conditions: Semi-battery, 0.2 C, voltage 4.0-2.0 V

Number of cycles: 2000

Domestic and international manufacturers of lithium iron phosphate materials:

Domestic: Yantai Zhuoeng Tianjin Bei Te Rui Tianjin Bamo Tianjin Strand Hangzhou Jinma Energy Yunnan Huilong Peking University Hunan Ruixiang Iron Tiger Energy Taiwan Long Yuan Taiwan Li Kai Zhengzhou Langtai Hangzhou Sainz Jiangxi Jin Li Technology Shenzhen Beit Rui and many more.

International: Canadian Phostech, American Valence, American A123, Japanese Sony. Among them, A123 is the largest and has received strong support from the U.S. government and is now bankrupt.

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