Lithium batteries are one of many types of batteries, and most people have some understanding of them. But are you familiar with lithium iron phosphate batteries? Do you know the difference between lithium iron phosphate batteries and lithium batteries? If you want to find the answers to these questions, please read on.
I. Lithium iron phosphate batteries
(I) Introduction
Lithium iron phosphate (LFP) batteries are lithium-ion batteries that use lithium iron phosphate as the positive electrode material. The main positive electrode materials for lithium-ion batteries include lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, ternary materials, and lithium iron phosphate. Among these, lithium cobalt oxide is currently the most widely used positive electrode material in lithium-ion batteries.
(II) Advantages
1. Lithium iron phosphate batteries have a long lifespan, with a cycle life exceeding 2000 cycles. Under the same conditions, lithium iron phosphate batteries can be used for 7 to 8 years.
2. Safe to use. Lithium iron phosphate batteries have undergone rigorous safety testing and will not explode even in a traffic accident.
3. Fast charging. Using a dedicated charger, the battery can be fully charged in 40 minutes at 1.5C.
4. Lithium iron phosphate batteries are resistant to high temperatures; their heat resistance can reach 350 to 500 degrees Celsius.
5. Lithium iron phosphate batteries have a large capacity.
6. Lithium iron phosphate batteries have no memory effect.
7. Lithium iron phosphate batteries are green and environmentally friendly, non-toxic, and pollution-free. The raw materials are widely available and inexpensive.
(III) Disadvantages
1. The tap density of the positive electrode in lithium iron phosphate batteries is low, typically between 0.8 and 1.3. They also have a large volume.
2. Poor conductivity, slow lithium-ion diffusion rate, and low actual specific capacity during high charge and discharge cycles.
3. Lithium iron phosphate batteries have poor low-temperature performance.
4. A single lithium iron phosphate battery has a long lifespan, around 2000 cycles, but a lithium iron phosphate battery pack has a short lifespan, generally around 500 cycles.
(iv) Application Areas
Large electric vehicles: buses, electric cars, sightseeing vehicles, and hybrid vehicles, etc.;
Light electric vehicles: electric bicycles, golf carts, small flatbed electric carts, forklifts, cleaning vehicles, electric wheelchairs, etc.;
Power tools: electric drills, chainsaws, lawnmowers, etc.;
Remote control cars, boats, airplanes, and other toys;
Energy storage devices for solar and wind power generation;
UPS, emergency lights, warning lights, and mining lamps (for the highest safety);
Replaces the 3V disposable lithium battery and the 9V nickel-cadmium or nickel-metal hydride rechargeable battery in cameras (identical in size);
Small medical instruments and portable devices, etc.
II. Lithium Batteries
(I) Introduction
Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloys as the negative electrode material and a non-aqueous electrolyte solution. Due to the highly reactive chemical properties of lithium metal, its processing, storage, and use require very strict environmental controls. Therefore, lithium-ion batteries were not widely used for a long time. However, with the development of science and technology, lithium-ion batteries have now become the mainstream technology.
(II) Advantages
1. High energy density. It has a high energy storage density, reaching 460-600Wh/kg, which is about 6-7 times that of lead-acid batteries;
2. Long service life, up to 6 years or more. Batteries with lithium iron phosphate as the positive electrode have a record of 10,000 charge/discharge cycles at 1C (100% DOD).
3. High rated voltage (single cell operating voltage is 3.7V or 3.2V), approximately equal to the voltage of three nickel-cadmium or nickel-metal hydride rechargeable batteries in series, facilitating the formation of battery power packs; lithium batteries can be adjusted to 3.0V using a new type of lithium battery voltage regulator technology, making them suitable for use in small electrical appliances;
4. It has high power handling capacity. The lithium iron phosphate lithium-ion batteries used in electric vehicles can achieve a charge-discharge capacity of 15-30C, which is convenient for high-intensity start-up acceleration;
5. The self-discharge rate is very low, which is one of the most outstanding advantages of this battery. It can generally be below 1% per month, less than 1/20 of that of nickel-metal hydride batteries.
6. Lightweight, weighing approximately 1/6 to 1/5 of lead-acid products for the same volume;
7. It has strong adaptability to high and low temperatures and can be used in environments ranging from -20℃ to 60℃. With processing modifications, it can be used in environments as low as -45℃.
8. Green and environmentally friendly, it does not contain or produce any toxic or harmful heavy metal elements and substances such as lead, mercury, and cadmium, whether in production, use, or disposal.
9. Production consumes virtually no water, which is highly advantageous for water-scarce my country. Specific energy refers to the energy per unit weight or unit volume. Specific energy is expressed in Wh/kg or Wh/L. Wh is a unit of energy; W is watt, h is hour; kg is kilogram (unit of weight), L is liter (unit of volume).
(III) Disadvantages
1. All lithium primary batteries have poor safety and pose a risk of explosion.
2. Lithium-ion batteries made of lithium cobalt oxide cannot discharge at high currents, are expensive, and have poor safety.
3. All lithium-ion batteries require protection circuits to prevent overcharging and over-discharging.
4. High production requirements and high costs.
5. There are limitations to its use; it is dangerous to use at high and low temperatures.
(iv) Application Areas
1. Transportation power supply
2. Power storage power supply
3. Mobile communication power supply
4. New energy storage power
5. Aerospace and military power supplies
III. Differences between Lithium Iron Phosphate Batteries and Lithium Batteries
Lithium iron phosphate batteries and lithium batteries are different.
1. Lithium iron phosphate batteries are used to make lithium-ion secondary batteries, and the main focus now is on power batteries. Compared with Ni-H and Ni-Cd batteries, they have great advantages.
2. Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloys as the positive electrode material and a non-aqueous electrolyte solution. The chemical reactivity of lithium metal makes its processing, storage, and use extremely demanding in terms of environmental requirements.
3. Lithium iron phosphate batteries do not catch fire or explode when punctured, unlike lithium batteries.
4. Lithium iron phosphate batteries can withstand overcharging to 100% without catching fire or exploding; lithium batteries will swell and release gas when they reach the specified values.
