What are the characteristics of lithium iron phosphate battery?

What are the characteristics of lithium iron phosphate battery?

1. High energy density
It is reported that the energy density of the square aluminum shell lithium iron phosphate battery produced in mass in 2018 is about 160Wh/kg. In 2019, some battery enterprises can reach the level of about 175-180Wh/kg, and some powerful enterprises can expand the overlapping process and capacity or reach 185Wh/kg.

2. Good safety

The electrochemical performance of lithium iron phosphate battery cathode material is relatively stable. This determines that it has a seamless charging and discharging platform. Therefore, the battery structure remains unchanged during charging and discharging, and it will not explode. It is also very safe under special conditions such as short circuit, overcharge, extrusion, and immersion.

3. Long life
The cycle life of lithium iron phosphate battery generally reaches 2000 times, or even more than 3500 times. Taking the energy storage market as an example, the cycle life of lithium iron phosphate battery is guaranteed to be more than 4000~5000 times, 8~10 years, more than 1000 cycles of ternary battery, and about 300 cycles of long-life lead-acid battery.

Synthesis of lithium iron phosphate battery.

The synthesis process of lithium iron phosphate is basically complete, mainly including solid phase method and liquid phase method. Among them, the high-temperature solid phase reaction method is widely used, and some researchers combine the microwave synthesis method of the solid phase method with the hydrothermal synthesis method of the liquid phase method - microwave hydrothermal method.

In addition, the synthesis methods of lithium iron phosphate include biomimetic method, cooling drying method, emulsion drying method, pulse laser deposition method, etc. Selecting other methods to synthesize products with small particle size and good dispersion performance can effectively reduce the diffusion path of Li. The contact area of the two stages is large, and the diffusion speed of Li is accelerated.

What are the industrial applications of lithium iron phosphate battery?

Application of new energy vehicle industry

In China's Energy Saving and New Energy Vehicle Industry Development Plan, it is proposed that "the overall goal of China's new energy vehicle development is to achieve the cumulative production and sales of 5 million new energy vehicles by 2020, and the scale of China's energy saving and new energy vehicle industry ranks among the world's top." Lithium iron phosphate battery is widely used in cars, passenger cars, logistics vehicles, low-speed electric vehicles and other fields due to its advantages of safety and low cost. However, it is currently affected by the national subsidy policy for new energy vehicles in the field of new energy cars. Due to the advantage of energy density, lithium iron phosphate battery still has irreplaceable advantages in passenger cars, logistics vehicles and other fields. In the field of bus, lithium iron phosphate battery accounted for 76%, 81% and 78% of the five, six and seven times of the New Energy Vehicle Promotion and Application Recommended Models Catalog (hereinafter referred to as the Catalog) in 2018, which still remained the mainstream. In the field of special vehicles, lithium iron phosphate batteries accounted for about 30%, 32% and 40% of the five, six and seven times of the Catalogue in 2018, respectively, with the application proportion gradually increasing. Academician Yang Yousheng believes that the use of lithium iron phosphate battery in the additional electric vehicle market can not only improve the safety of vehicles, but also support the marketization of additional electric vehicles, so as to eliminate the anxiety of pure electric vehicles in terms of mileage, safety, price, charging, and subsequent battery problems. During the period from 2007 to 2013, many automobile companies began to increase the program of pure electric vehicles.

Launching applications from power

In addition to the power lithium battery function, the starting lithium iron phosphate battery also has the function of instantaneous high power output. The electric lithium battery less than 1 degree centigrade is used to replace the traditional lead-acid battery, and the BSG motor is used to replace the traditional starting motor and generator. It not only has the function of starting and stopping at idle speed, but also has the functions of engine stop sliding, sliding and braking energy recovery, acceleration assistance and electric cruise.