About the operation principle of lithium-ion batteries is introduced

Source: 2020 - 03 - 23 when he hits: time to introduce the working principle of lithium-ion battery lithium ion battery: the working principle of the anode of lithium ion battery lithium atom is generally selected data is relatively simple, charging, the anode of lithium atom become lithium ion, and then through the electrolyte transport, through the central hole of the structure of the gap and negative electrode, and stored in the graphite. In the process of discharge, the lithium ions released from the cathode, by the electrolyte transport, and back to the anode by interval data. This is the lithium ion battery charge and discharge process, it is like a person sitting in a rocking chair from side to side. Lithium ion batteries are introduced in the late 1990 s in China. After 20 years of development, in the secondary battery ( The disposable batteries) Market, relative to the lead acid battery and lithium-ion batteries nickel chromium nickel metal hydride batteries are still a small group. According to the survey, the current market share of about 20 - 30%. The advantages of lithium ion batteries. For example, the working voltage of lithium ion battery can reach 3. 5 v to 3. Between 8 v, laboratory research of lithium ion battery up to 5 v. In addition, the lithium ion battery better on capacity and energy density, the above two features in general better than the traditional nickel chrome nickel metal hydride batteries more than two times. Lithium ion batteries are also more environmentally friendly. Generally speaking, the lithium ion battery is mainly composed of the anode, cathode and electrolyte of three parts. Positive electrode materials research relatively early in our country, the industrial development is relatively early, general commercial: manganese acid lithium layered structure and spinel and olivine structure of manganese series data and lithium iron phosphate series. Graphite is only negative commercial available. Different from the traditional secondary battery, lithium ion battery electrolyte is an organic electrolyte, it made up of organic liquid electrolyte for aqueous electrolyte is flammable, this is a serious security hidden danger. Demand, points out the common commercial DianXieYan is called six fluorine material of lithium phosphate. Is one of the features of this material, when the environment temperature reached 60 degrees, it will decompose, and in the daily use of mobile phones, the temperature is easy to achieve. Six fluoride phosphate lithium will also release the gaseous substances in the process of decomposition, there is a big security hidden danger. In addition to these three pieces, lithium ion battery is a more important part of the gap. Clearance is generally made up of PP or PE material plastic film, its main function is to isolate the battery of the positive and negative, prevent short circuit. It should be pointed out that, in order to ensure smooth process of charging and discharging lithium ion, absolute requirement gap gap uniform pore size distribution structure, manufacturing process requirement is very high, early no gap of domestic production capacity. Here, the barriers of the state of the art in battery safety also plays an important role. According to the working principle of lithium ion, lithium ion in the electrolyte is reciprocating transmission. First, the viscosity of the electrolyte are requested not to too much. If it is too big, can form the driving resistance, cause local overheating. Secondly, shall ensure that meet the gap of xiaochang, and have a certain strength, gap can't obstruct lithium ion channels, also cannot damage through several times of charging and discharging process or aperture increase, this is an important condition to ensure the safety of the lithium ion battery.