Development potential of lithium battery

Lithium-ion batteries have A lot of batteries do not have the characteristics of: a. the weight of the high energy density lithium ion batteries are the same half of the capacity of nickel cadmium or nickel metal hydride battery, volume is 20-30% of nickel cadmium, nickel metal hydride 35-50%. B. high voltage of a lithium ion battery monomer working voltage is 3.7 V (mean), equivalent to three series of nickel cadmium or nickel metal hydride battery. C. no pollution lithium ion battery does not contain harmful metals such as cadmium, lead, mercury. D. do not contain metallic lithium lithium ion batteries do not contain metallic lithium, which is not affected by the transportation regulations prohibiting in passenger plane carrying lithium battery, etc. E. high under normal conditions, the cycle life of lithium ion battery charge and discharge cycles can be more than 500 times, lithium iron phosphate (hereinafter referred to as phosphorus iron) can reach 2000 times. F. no memory effect memory effect refers to a nickel cadmium battery in the process of charge and discharge cycle, the battery capacity to reduce the phenomenon. Lithium ion battery no such effect. G. quick charge using the nominal voltage of 4.2 V constant current constant voltage charger, can make the lithium ion battery charged at 1.5-2.5 hours; And the new development of phosphorus iron lithium electricity, can be recharged in 35 minutes. Small lithium battery industry in the 1990 s, is now at the mature stage. Lithium battery starting in the 70 s, but it was not until the 90 s security remains unresolved, the main reason is to use a metal lithium anode materials, easy to explode. Until SONY company adopts carbon as cathode materials, the safety problems to solve, since then the lithium battery in the computer, mobile phones, digital cameras, and other fields has gained popularity. Traditional energy depleted, power lithium electricity gradually valued, the anode materials is developing rapidly. Small lithium electricity using cobalt acid lithium and carbon as anode materials, but if used on the new energy vehicles, the following problems: first, cobalt as a scarce resource, the high cost; Second car in bring large current charge and discharge in the process of acceleration and deceleration, lithium anode deposit, and production of crystal, through the film, causing short circuit batteries, organic electrolyte under the condition of high quantity of heat explosion. Starting in the 90 s, American professor Goodenough invented the lithium iron phosphate, and the material ratio performance is good, structure under high current density doesn't change, so as to make the lithium electricity application in power battery is possible. But lithium iron phosphate has a lot of problems need to solve: low voltage (3.3 V, cobalt acid lithium is 3.3 V), the energy density is low Although the power li-ion battery is defective, but the problem can be solved in the development, industry promising in the future. Battery as a system, although the anode material in the past few years has developed rapidly, but membrane, electrolyte, anode and there are many problems to be solved. 1) at present there are many kinds of lithium battery cathode materials, the most main or carbon materials, is middle c d ball which is widely applied, the dragon via electronic technology (shenzhen) co., LTD has industrialization. But used in the power li-ion battery also need to solve large current charge density of lithium in the cathode material deposition problems; 2) electrolyte can meet small lithium electricity application at present, but the application on the power li-ion battery need to be modified, such as flame retardant research; 3) polymer diaphragm need hole closed, at high temperature is improved to avoid the battery short circuit, etc. The short term, power lithium electricity still exist many problems, but if looking for a long time, with continuous development of technology, industry promising future is good.