All in one solar street light adopts solar energy as energy source, which has the characteristics of energy saving, environmental protection, simple installation, safety and no hidden danger and automatic control and maintenance. However, with the maturity of solar street lamp lithium battery technology, more and more solar street lamps use lithium batteries. The common lithium battery cells on the market are divided into Li-ion batteries and lithium iron phosphate.
Then, is the solar street lamp using a ternary battery or LiFePO4 battery? Which is more advantageous?
1. What is a LiFePO4 battery?
It refers to a lithium ion battery using lithium iron phosphate as a positive electrode material. Its characteristic is that it does not contain precious elements such as cobalt. The raw material price is low and phosphorus and iron are abundant in the earth's resources, and there is no problem of feeding. Its working voltage is moderate (3.2V), its capacity per unit weight is large (170mAh/g), high discharge power, fast charging and long cycle life, high stability under high temperature and high heat environment.
Advantages: Compared with the more common lithium cobalt oxide and lithium manganate batteries currently on the market, LiFePO4 batteries have at least five advantages: higher safety, longer service life, and no heavy metals and rare metals ( Low raw material cost), fast charging and wide operating temperature range.
Disadvantages :Lithium iron phosphate has some performance defects, such as low tap density and compaction density, resulting in lower energy density of lithium ion batteries; higher material preparation costs and higher battery manufacturing costs.
What is Ternary polymer lithium battery?
A lithium battery of a lithium lanthanum manganese oxide (Li(NiCoMn)O2) ternary positive electrode material is used as a positive electrode material. Advantages The ternary lithium battery has high energy density and better cycle performance than normal lithium cobaltate. The nominal voltage of the battery has reached 3.7V, and the capacity has reached or exceeded the level of lithium cobalt oxide battery.
Disadvantages: The ternary material power lithium battery mainly includes nickel-cobalt lithium aluminate battery and nickel-cobalt-manganese lithium battery. Due to the high temperature structure of nickel-cobalt aluminum, the high-temperature safety is poor, and the pH value is too high, so that the monomer is flat. , and then lead to danger.
In short, the ternary battery Advantages: The performance is less affected by temperature, low temperature resistance, and can be used in low temperature environment of minus 15 degrees to 30 degrees.
Disadvantages: The number of cycles is short, and the service life is short compared to lithium iron phosphate. At the same time, the safety and stability are poor, the high temperature is easy to decompose, and the combustible electrolyte and carbon material in the battery will be a little bit, and the deflagration phenomenon occurs.
LiFeP04 Advantages:lithium iron phosphate battery lithium iron phosphate electrode material is currently the most safe lithium ion battery cathode material, plus its cycle life of more than 2000 times, standard charging (5 Hour rate) can be used to achieve 2000 cycles. excellent charge and discharge performance, many cycles, long service life, high temperature stability, 700-800 °C will begin to decompose, and will not release oxygen molecules in the face of impact, acupuncture, short circuit, etc. It does not produce violent combustion and has high safety performance.
Disadvantages: Performance is greatly affected by temperature, especially in low temperature environments, discharge capacity and capacity are greatly reduced, and its energy density is low.However, lithium iron phosphate batteries have a fatal disadvantage, that is, poor low temperature performance, even if they are nano-sized and carbon coated, this problem is not solved. Studies have shown that a battery with a capacity of 3500 MAH, if operated in a -10 ° C environment, after less than 100 charge and discharge cycles, the power will be abruptly attenuated to 500 MAH, basically scrapped.
We recommend that the integrated solar street lamp should choose LiFePO4 battery in high temperature area, which is safe and stable and has a long service life. If it is a low temperature country, please choose ternary lithium battery.
As a leading solar street light manufacturer, shenzhen moonlight technology limited insist using A-class LiFePO4 lithium battery.
How to choose the best solar street light battery?