There are currently three main types of mobile power cells on the market: 18650 cells, polymer cells, and lithium iron phosphate cells. The best choice for consumers is lithium polymer batteries, followed by 18650 batteries. Compared with the first two, lithium iron phosphate battery technology is immature, and its fatal flaws of large size and high price make it impossible to use . moving. Medium-scale power supply. This article presents the first two types of batteries.
18650 Battery Cell
18650 lithium battery refers to a battery with a diameter of 18mm and a length of 65mm. 0 indicates a cylindrical battery. 18650 battery cell technology is relatively mature. The battery structure is stable, the specific capacity is high, the overall performance is outstanding, and it cancan be used in many ranges due to its small size. The disadvantage is that its safety is worse than that of lithium polymer batteries, and the number of battery core cycles is low, only about 300 times.
Polymer batteries
The difference between polymer batteries and traditional lithium-ion batteries lies in the production process. Lithium batteries are wound and soft in size. The polymers are stacked and have a more rigid shape. For polymer and lithium batteries of the same volume, the polymer has a greater capacity, approximately 30% greater. And safer, with less risk of explosion. long duration. It can be charged and unloaded more than 500 times. The disadvantage is the high cost of polymer batteries of the same capacity, which are at least 100% more expensive than 18650 lithium-ion batteries.
1. Lithium metal battery: Lithium metal battery generally usesmanganese dioxide as the positive electrode material, lithium metal or its metal alloy as the negative electrode material, and uses a non-aqueous electrolyte solution.
2. Lithium-ion battery: Lithium-ion battery generally uses lithium alloy metal oxide as the positive electrode material, graphite as the negative electrode material, and non-aqueous electrolyte.