The emergence of long-lasting power lithium batteries may become the core of the future of China's new energy vehicles, and will also become a new energy source. It also proves that technology can really make the world more environmentally friendly. Then let Xiaobian introduce them to you. Let's talk about it.
Long battery life lithium battery or will become the core of the future of China's new energy vehicles
In China, as one of the core components for the development of electric vehicles, power batteries have always been a hot topic in the field of batteries. In the key special projects of national energy R&D programs launched in 2016, the researcher of the Clean Energy Laboratory of the Institute of Physics, Chinese Academy of Sciences泓Responsible for the “Long-term Power Lithium Battery New Materials and New System Study” project, which aims to develop high-energy-density, high-safety lithium batteries to increase the mileage of electric vehicles. The research proposed by the project includes lithium-ion batteries and semi-solid lithium-sulfur batteries. , Solid state lithium air battery three long-term power lithium battery, or will become the core of the future of China's new energy vehicles.
Challenge battery limit energy density
'Improvement of power battery cell energy density to 400Wh/kg or more will help to significantly increase the mileage of electric vehicles. Take Beiqi EV200 as an example, 400Wh/kg cell, equivalent to 800Wh/L or more volumetric energy density. There is a battery pack volume and 100 kilometer per ton power consumption, a charge can not only last 620 kilometers; also can reduce costs, extend the service life, to solve the current big difference between the performance of electric vehicles and fuel vehicles. 'Day ago, Li When interviewed by a reporter from Science and Technology Daily, he said.
As an important part of the national R&D of new energy vehicle power batteries, the task of this project is to develop new batteries with an energy density of 400Wh/kg or more at the front end of the industrial chain, and to accumulate the key scientific issues and knowledge of high-energy-density batteries. Technology, and provide an important reference and guidance for the simultaneous development of 300Wh/kg batteries.
'Long-term power lithium battery new materials and new system research' R & D team is to assume the task of challenging the battery's ultimate energy density in this project.
Mass production cell energy density 300Wh/kg can be realized
The reporter found out from the company’s public R&D program that the project team chose a high-nickel anode and a nano-silicon carbon anode for the 300Wh/kg lithium-ion power battery route.
'From the recent progress, the technical indicators for mass production of the battery's energy density up to 300Wh/kg can be realized.'
In the recent research on new system batteries, the lithium-rich material used by the R&D team of the “Longevity Power lithium battery new materials and new system research” research group has a positive electrode and the silicon carbon material has a negative electrode cell energy density of 348Wh/kg. The lithium-rich material is a positive electrode, the metal lithium as a negative electrode has a specific energy of 573 Wh/kg, the lithium sulfur battery has a specific energy of 600 Wh/kg, and the lithium lithium battery has a specific energy of 780 Wh/kg.
'The development of high energy density batteries over 300Wh/kg, the negative electrode contains metallic lithium is an important common technology. Some research teams proposed the use of solid electrolyte or mixed solid electrolyte to solve the main problems facing the use of batteries containing or containing lithium metal anodes Technical challenge. ' Li Yu said.
In November 2013, the Chinese Academy of Sciences laid out the Class A project of the Chinese Academy of Sciences' strategic leader. This project also supports the development of solid-state batteries. Three of the teams have made progress in polymer, sulfide, and in-situ solid state technology.
Clear technical route but still face challenges
'The current development and production of liquid electrolyte lithium-ion battery soft pack batteries, the general liquid electrolyte weight percentage of 15% -25%, the negative electrode is carbon, silicon, etc. In the long run, the future needs to develop all solid state lithium metal batteries, negative With lithium metal, the battery does not contain any liquid. ' Li Yu said.
Although the technical route is relatively clear, it currently faces great challenges. Li Wei said that from the perspective of the development of hybrid solid electrolyte batteries and all-solid-state lithium metal batteries, it is necessary to focus on the development of solid electrolytes and metallic lithium materials to solve interface ions and electrons. Transmission, and dimensional deformation, thermal stability issues. Most manufacturing equipment can be implemented using existing lithium-ion battery and primary metal lithium battery manufacturing equipment.
In addition, production environment control technologies such as drying rooms for large-scale production of lithium metal batteries have also been mastered. Despite the development of hybrid solid-liquid electrolyte batteries and all-solid-state lithium metal batteries, there are also many scientific and technological challenges, including cost control challenges. .
'As long as a solid and in-depth study of the underlying scientific issues, and put forward feasible and creative comprehensive solutions, even if it is difficult, it is full of hope.' Li Yu said.
