18650 lithium ion battery supplier share with you: In recent years, with Musk's Tesla Motors sweeping the globe, the electric car industry has entered the public eye, and lithium-ion batteries, a key technology in the process, have received unprecedented attention and support in countries around the world.
18650 Cylindrical Battery
1. Lithium ion battery overview:
Batteries have been developed as an electrical energy storage device for 200 years, from the first non-rechargeable batteries (such as zinc-manganese dry batteries) to rechargeable batteries (such as lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries) to more recently lithium-ion batteries.The battery of tesla's electric vehicle, lithium ion battery, model 18650 cylindrical battery (18 for diameter of 18 mm, 65 for length of 65 mm, 0 for cylindrical battery).Lithium-ion battery technology was developed in the 1960s and commercialized by SONY in 1992.
2. Lithium ion battery structure and materials
Lithium ion battery internal is mainly composed of the cathode and anode, separator and the electrolyte . During the charge and discharge process, lithium ions are dispersed between the positive and negative electrodes by electrolytes and embedded or released from the active material to store electric energy. Lithium ion battery materials are mainly composed of anode materials, cathode materials, membrane and electrolyte, in addition to the battery shell.In current commercial battery materials, the anode materials mainly include cobalt acid lithium (such as a variety of electronic products), lithium iron phosphate material (such as byd automobile use), three yuan (e.g., tesla motors used), the cathode materials mainly include graphite materials and lithium titanate materials, membrane materials mainly are high strength thin films, porous membrane of polyolefin electrolyte mainly adopts organic lithium compounds, shell mainly adopts steel shell.
3 lithium ion battery current market situation and future market prospects
The global lithium battery market grew from 84 billion yuan in 2011 to 175.5 billion yuan in 2015, with an average annual compound growth rate of 20.2%. The global lithium ion battery market has maintained a steady growth trend. China, Japan and South Korea now make about 95% of the world's lithium-ion batteries, and China's production is growing fast and its market share is steadily rising.At present, lithium ion battery is mainly used in small intelligent products, such as smart phones, smart watches, etc., in the future, the lithium ion battery will be applied to large smart devices, such as the electric car, robot, intelligent household facilities, etc., these large equipment need more lithium ion battery, larger market will drive the lithium ion battery industry development, the huge demand for lithium ion batteries will be exponentially.The next 5 to 10 years will be a glorious period for the lithium ion battery industry.
4. Current development level of lithium ion batteries
The operating voltage of single lithium ion batteries is as high as 3.7-3.8v (3.2v for lithium iron phosphate), which is three times that of nickel-metal hydride and nickel-cadmium batteries.The energy density of commercial products has reached above 150 mAh/g, which is close to about 88% of its theoretical value, and the power density has reached about 160 Wh/Kg (2-3 times as much as nimh battery, 3-4 times as much as nickel-cadmium battery).The average cycle life can reach more than 500 times, even more than 1000 times, lithium iron phosphate materials can reach more than 2000 times.
5. Technology trends
At present, lithium ion batteries have three trends in terms of technology development :(1) development and use of new high-performance electrode materials;(2) developing large-capacity lithium-ion power batteries for electric vehicles;(3) further reduce the cost of lithium ion batteries and improve their safety performance.
Tesla electric vehicles using the panasonic provide car lithium cylindrical batterys, the lithium ion battery using the ternary materials, aluminum nickel and cobalt acid lithium anode material, the material cost significantly lower than the traditional cobalt acid lithium battery anode materials, but improves the dynamic performance of the battery, under the same capacity significantly increase the output power of the tesla electric vehicle, and the service life of the battery, large current charging capacity (an important indicator of quick charge technology) has also been improved. Byd, tesla's Chinese rival, has sought to reduce the cost of its electric cars by using a lithium iron phosphate cathode material, which has a lower energy density but less cost, has about twice the life span of lithium nickel-cobalt aluminate and has the best safety features of any commercially available cathode material.In the future, power batteries used in high-power equipment such as heavy-duty trucks and forklifts will see rapid development, and the development of lithium-ion power batteries will become a new battlefield for new-energy automobile manufacturers.