The definition, characteristics and classification of lithium polymer batteries

Source: 2020 - 04 - 12 21:03 hits: once the definition, characteristics and classification of lithium polymer battery lithium ion batteries as a green energy development in the middle of the 20th century, the traditional lead, cadmium, nickel, nickel metal hydride secondary battery has the following advantages: high voltage ( The voltage is greater than 3. 6 V, higher than that of lead-acid battery 2. 0 V, nickel metal hydride, nickel cadmium cell 1. 2 V) , high specific energy ( Energy volume ratio, energy and mass ratio) , the use of wide temperature range, long cycle life, environmental protection, no memory effect, low self-discharge rate, the advantages of large current charge and discharge [ 1] 。 Lithium battery, Free) , also known as the lithium-ion batteries (from the positive Cobalt acid lithium oxide, acid lithium manganese acid lithium oxide, iron oxide, oxide, lithium iron phosphate, etc. ) And the negative electrode ( Hard and soft graphite, carbon, carbon, etc. ) , electrolyte, polymer separation membrane and rechargeable battery protection circuit. In practice, from mobile phones, MP3 / MP4 and other small power supply to the large batteries of electric cars, better performance of lithium ion battery is undoubtedly the most wise choice. 1. The definition of lithium polymer batteries batteries commonly three elements: positive and negative, electrolyte. Lithium polymer battery is a battery system, it USES at least one or more than three kinds of polymer materials. In the current lithium polymer battery system, most polymer materials used in the anode and electrolyte. The anode materials used in lithium ion battery is commonly used conductive polymer or inorganic compounds. Cathode is usually made up of lithium metal or lithium compounds between carbon layer. Electrolyte can be solid, can also be a gel polymer electrolyte, or organic electrolytes. Because there is no redundant electrolyte of lithium polymer, so it is more reliable and stable. 2. The characteristics of the lithium polymer battery lithium polymer battery ( Also known as the polymer lithium ion battery) Than can be high, small, thin, light weight, high safety, etc. Based on this advantage, lithium polymer battery can be used in any shape and capacity to meet the needs of a variety of products; And it USES the blister pack, internal problems may be expressed through external packing immediately, even if there are security hidden danger, also won't bang, will only drum belly. In polymer battery, the electrolyte is a membrane and electrolyte: on the one hand, it will be like a diaphragm and the anode material and anode materials, prevent the battery self-discharge and short circuit; On the other hand, it as electrolyte conductive lithium ion between the positive and negative. Polymer electrolyte is not only has good electrical conductivity, but also has the polymer materials such as light weight, good elasticity, easy film characteristic, also conforms to the development trend of chemical power source, is light, safe, efficient and environmentally friendly. 3. The classification of lithium polymer battery lithium polymer battery by the electrolyte can be divided into three categories: ( 1) Gel polymer electrolyte [ 11] Lithium ion battery, which is added in the solid polymer electrolyte additive to improve the ionic conductivity, the battery can be used at room temperature; ( 2) Solid polymer electrolyte of lithium ion battery, the electrolyte is a mixture of polymer and salt, the ionic conductivity at room temperature is low, suitable for high temperature use. ( 3) Composite gel polymer cathode materials of lithium ion battery, conductive polymers as cathode materials, the ratio can be three times the current lithium ion battery and lithium ion battery is the latest generation. Due to various reasons, such as technology, lithium polymer battery now concentrated in the small current charging and discharging characteristic studies on large capacity small capacity battery, high power lithium ion battery protection circuit immature [ 20] , once solved the large capacity of lithium polymer batteries, balance and protection circuit problems, and then the polymer lithium ion battery will better applied to electric moped, therefore, more research on lithium polymer has significant social and economic benefits, but also has other potential significance.