Recently, Professor Chen Jian of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences led an advanced secondary battery research team to make important progress in high-energy lithium secondary batteries. He has successfully developed a lithium-sulfur battery with a rated capacity of 15 Ah and has formed a small batch production capacity.
It is understood that the detected battery specific energy is greater than 430Wh/kg, is currently the largest reported capacity of lithium-sulfur batteries, exceeds SionPower's reported lithium-sulfur battery 2.5Ah @ 350Wh/kg technical indicators, is currently engaged in lithium-sulfur batteries The highest level of research.
Lithium-sulfur battery is a kind of sustainable high specific energy secondary battery. It has many advantages such as rich element reserves and low cost. It is a research hotspot of electric vehicle battery. At present, the international technical level of lithium-sulfur batteries is approximately 350 Wh/kg. To this end, the goal of lithium-sulfur battery research and development is that by 2016, the lithium-sulfur battery has an energy density of 400-600Wh/kg, which is expected to drive the battery-driven electric vehicle to exceed 500 kilometers.
According to public information, Chen Jian's research team has been developing new materials and new technologies for lithium-sulfur batteries since its establishment in 2009. It has made new breakthroughs in theory and technology and has obtained high theoretical data and technical indicators. This is an important progress made by the Dalian Institute of Materials for lithium-sulfur batteries under the Ministry of Science and Technology's 863 Program and the nano-pilot project of the Chinese Academy of Sciences under the “long-term power lithium battery†project.
According to industry experts, the specific energy density of the secondary battery system composed of elemental sulfur as a lithium-sulfur secondary battery positive electrode material and metallic lithium can reach 2600 Wh/kg, and is a commercial lithium cobalt oxide/graphite lithium ion battery (the theoretical energy density is 360 Wh/ 7 times of kg); meanwhile, elemental sulfur is low in price, rich in output, safe and non-toxic, and environment-friendly, so lithium-sulfur battery is considered as a new generation battery with promising development.
For decades, the energy density of lithium-ion batteries has continuously increased, and is widely used in smart phones and other fields. However, lithium-ion batteries require bulky cathodes (usually made of materials such as cobalt oxide) to “receive†lithium ions, limiting the further increase in battery energy density.
In the context of a significant increase in energy density requirements, scientists have turned their attention to lithium-sulfur batteries, which are the slimmer lithium-sulfur batteries for lithium-ion batteries. The cathode of the latter is mainly made of sulfur (a cheap by-product of the oil industry). . The "weight" of sulfur is only half that of cobalt. Therefore, the same volume of sulfur accommodates twice as many lithium ions as cobalt oxide, which makes the energy density of lithium-sulfur batteries several times that of lithium-ion batteries.
Industry experts said that although the anode of lithium-sulfur batteries is an important bottleneck to limit their application and a problem that needs to be solved, these problems can be solved by forming carbon-sulfur composite electrode materials. (Ke Zong)
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