The face of intensified power battery development trend, China's policy guidance and support has become the world's largest new energy vehicle market.According to the national four ministries jointly issued the program pointed out: power battery is the heart of electric vehicles, new energy vehicles Industrial development of the key.Although the power battery industry in China after years of development has made great progress, but the current power battery product energy density and cost is still difficult to meet the new energy vehicles to promote the demand for popularization. Based on policy promotion and power battery technology development, Force filial look, lithium companies need to break through the limitations of lithium-ion battery, timely layout to explore the development of lithium-sulfur battery has been urgent, lithium-sulfur battery prospects can be expected.
He said that the current highly favorable lithium-ion battery with ternary material, its energy density in the next one to two years will be close to the theoretical value, it is difficult to more than 350 Wh / kg, and to create 400 Wh / kg or more Secondary battery, you need to develop a new lithium battery system, also known as the era of lithium batteries; which lithium-sulfur battery system or the rise of lithium for the field of development and exploration to provide more ideas and possible.
Lithium-sulfur battery is a lithium battery as a battery cathode, metal lithium as a negative lithium battery.Using sulfur as a cathode material lithium-sulfur battery, sulfur theoretical specific capacity and battery theoretical energy reached 1675 mAh / g and 2600Wh / kg, much higher than the current commercial lithium-ion battery. Elemental sulfur is rich in reserves in the earth, and petroleum by-products can provide rich sulfur, so the price of sulfur is very low, only 1,000 yuan / ton, compared to Lithium ion cathode material lithium carbonate per ton up to 16 million or more, the raw material price difference of more than 160 times.Therefore, Dr. Miao Li Xiao believes that sulfur is made of lithium battery is a very promising lithium battery. Lithium-sulfur battery cathode for the elemental sulfur and carbon, the cathode is composed of a single lithium metal, sulfur easily sublimation, a simple heating can be recycled in the sulfur cathode, the future waste lithium-sulfur battery recycling is relatively simple, low cost; Lithium ion battery with transition metal oxide as the cathode is recovered in a complicated process. To recover the precious metals in the cathode material, whether it is high temperature calcination or wet pickling, Consumption of high, difficult, but also more likely to cause serious secondary pollution.
In recent years, domestic and foreign universities and research institutes and materials and electrochemical-related laboratory have carried out basic research and development of lithium-sulfur battery, which foreign lithium-sulfur battery research and development companies: OXIS and SION POWER has been developing lithium-sulfur battery research and development . SION POWER company in 2010 will be lithium-sulfur battery used in large unmanned aerial vehicles, breaking the three UAV flight world record: flight up to 20,000 meters above the longest dead time (14 days), the lowest operating temperature ( -75 ℃.) At present, lithium-ion battery can not be achieved so that unmanned aerial vehicles in high-altitude low-temperature environment for a long time lag.To take into account the safety of lithium-sulfur battery can not be completely completely resolved, therefore, lithium sulfur battery will be the first application And unmanned aerial vehicle field, and the future application of unmanned aerial vehicles is also very wide.
Although the development of lithium-sulfur battery is currently subject to a lot of business concerns, but most of the domestic R & D team started in 2011, into the lithium-sulfur battery industry research and development of the Institute of Chemical Defense, Chinese Academy of Sciences, National Defense University and a few, To promote research and development of lithium-sulfur battery industry is also facing some urgent problems.Miao Lixiao bluntly, restricting the industrialization of lithium-sulfur battery four major bottlenecks: the current positive element sulfur is not conductive problem has been basically solved; discharge intermediate products The dissolution and dissolution of the fossil has also been alleviated; the volume expansion after the sulfur discharge leads to the destruction of the positive electrode structure has also been suppressed; and the lithium metal to do the negative, resulting in multiple charge and discharge cycle after the lithium powder, making the battery life shortened and the existence of security Hidden problems become lithium sulfur battery industrialization road to break the fortress.
At present, the development of domestic lithium-sulfur battery has also made great progress, according to the data show that although the current high-energy density lithium-sulfur battery cycle life is difficult to more than 300 times, but low energy density (220Wh / kg) lithium Sulfur battery cycle life of up to 1000 times, high - energy density of lithium - sulfur batteries can reach 500 Wh / kg or more (currently reported the highest domestic up to 900 Wh / kg), almost 3 to 5 times the lithium ion. Although lithium-sulfur battery in the real practical process there are still many problems, but I believe it is still the most likely next-generation high-energy density secondary battery, the future, lithium-sulfur battery will be represented by ternary power lithium The battery market caused a great impact. "Miao Li Xiao said optimism.
"Made in China 2025": 'continue to support the development of electric vehicles, fuel cell vehicles, master the car low carbon, information, intelligent core technology, enhance the power battery, drive motor, efficient internal combustion engine, advanced transmission, lightweight materials, intelligent control Such as the core technology of engineering and industrialization capacity. 'Miao Li Xiao said that the current national policy and technology development driven by the new energy companies is imperative to increase R & D investment efforts to accelerate the breakthrough and break through the lithium negative technical difficulties , In order to avoid the lithium-ion battery cathode materials are facing the core technology is dominated by foreign embarrassment; also because the lithium-sulfur battery industry is still in the initial stage of development, is our new energy companies to seize the opportunity to obtain future lithium sulfur battery discourse The best time of the right.
