Lithium-ion batteries and lead-acid cell are two kinds of batteries widely used at present. Lithium-ion battery performance is better than a lead-acid cell. Although most UPS power supply uses lead-acid cell because of the price problem, lithium-ion batteries can completely replace lead-acid cell after a period of time.
1. The use of cycle life
Lithium-ion batteries have a longer life, and lead-acid cell have a relatively short life. Lithium-ion battery cycles are generally around 2000-3000 times.
lead-acid cell cycles are about 300-500 times.
2. Weight energy density
Lithium-ion battery energy density is generally 200~ 260Wh /g, lithium-ion battery is 3~5 times of lead-acid, which means that the same capacity, lead-acid cell is 3~5 times of lithium-ion battery, so in the energy storage device lightweight, lithium-ion battery occupies an absolute advantage.
lead-acid cell are generally in the range of 50~ 70Wh /g, low energy density, too heavy.
3. Volume energy
The volume and capacity density of lithium-ion batteries is usually about 1.5 times that of lead-acid cell, so for the same capacity, lithium-ion batteries are about 30% smaller than lead-acid cell.
4. Different temperature range
The operating temperature of a lithium-ion battery is -20-60 degrees Celsius. The peak thermal value of a lithium-ion iron phosphate battery can reach 350~500 degrees Celsius. It can still release 100% capacity at high temperatures.
The normal operating temperature of a lead-acid cell ranges from -5 °C to 45 °C. When the temperature drops by 1 °C, the relative battery capacity decreases by about 0.8%.
5. Charge and discharge are different
Lithium-ion battery has no memory effect, the battery can be charged and discharged at any time, the battery self-discharge is low, the battery can be stored for a long time; Strong power, fast charge, and release, 20 minutes can be filled 80%, 15 minutes can be telex release.
lead-acid cell has a memory effect, can not be charged at any time discharge; There is a serious self-discharge phenomenon, the battery used for a period of time is easy to scrap; The discharge ratio is small, can not be long time large current discharge.
6. Different internal materials
Lithium-ion battery positive and negative electrode lithium cobalt oxide/lithium iron phosphate/lithium manganese oxide, graphite, organic electrolyte.
lead-acid cell positive and negative electrode lead oxide, metal lead, an electrolyte for concentrated sulfuric acid.
7. Different concepts and properties
Lithium-ion battery: a class of batteries with a non-aqueous electrolyte solution and a lithium metal or lithium alloy as the cathode material. It works by moving lithium ions between the positive and negative electrodes. In the process of charging and discharging, Li+ is embedded and unembedded between the two electrodes. When charging, Li+ is removed from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state. In discharge, the opposite is true. Due to the very active chemical characteristics of lithium-ion batteries, the processing, preservation, and use of lithium metal have very high environmental requirements.
lead-acid cell: lead-acid cell is also called a secondary battery. It is a device that converts chemical energy directly into electrical energy. It is a rechargeable battery designed to be recharged through a reversible chemical reaction. It usually refers to a lead-acid cell. After discharge, it can regenerate the active substance inside by charging it — storing electrical energy as chemical energy; The chemical energy is converted to electrical energy again when it needs to be discharged. The lead-acid cell is a kind of electrochemical equipment that stores chemical energy and releases electrical energy when necessary.
8. The safety performance is not the same
Lithium-ion battery: Lithium-ion battery comes from the stability of cathode materials and reliable safety design, lithium iron phosphate battery has been through strict safety test, even in a violent collision will not produce an explosion, lithium iron phosphate thermal stability is high, electrolytic oxygen ability is low, so high safety.
lead-acid cell: lead-acid cell will produce explosion in a strong collision, which poses a threat to the life safety of consumers.
9. The price is different
Lithium-ion batteries: Lithium-ion batteries are expensive. Lithium-ion batteries are about three times more expensive than lead-acid cell. Combined with life analysis, lithium-ion batteries still have a longer life cycle for the same cost.
lead-acid cell: the price of a lead-acid cell is about from several hundred yuan to several thousand yuan, the price of each manufacturer is much the same.
10. Green environmental protection is different
Lithium-ion battery material without any toxic or harmful substances is regarded as green environmental protection battery in the world, the battery in production and use are pollution-free, in line with the European RoHS regulations, green environmental protection battery. There is a large amount of lead in a lead-acid cell, which will pollute the environment if it is not handled properly.