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XINWEN  Addtime£º2019/3/26   Read£º129 Times¡¾ Fontsize£ºL M S ¡¿

Fraunhofer ISC will provide its experience and technology in solid-state battery process development and battery production, and produce the first batch of solid-state batteries.


"The global production and manufacture of lithium batteries are mainly controlled by China, Japan and Korea. The European automotive industry, with 3.4 million employees, has shifted from internal combustion engines to electric drive systems, and if it fails to introduce key lithium-ion technologies into Europe, it will depend on the power batteries of Asian manufacturers.


The upcoming leap in solid-state battery technology offers an opportunity to turn the tables.


Fraunhofer-Gesellschaft, Germany's largest Research Institute for Applied Science in Europe, is working on a strategic international cooperation plan on solid-state batteries, which was undertaken by Empa of DU Bendorf (CH) in Switzerland and ISC of Fraunhofer Silicate Institute of WU rzburg University in Germany. It launched a solid-state battery in January. Project.


Fraunhofer ISC will provide its experience and technology in solid-state battery process development and battery production, and produce the first batch of solid-state batteries.


Solid-state batteries do not require flammable liquid electrolytes, thus providing significantly improved operational reliability. They also offer advantages in size and weight because less complex safety shells are needed. In addition, using metal negative material (lithium) instead of graphite negative electrode, which is commonly used in solid-state batteries, can improve energy density and significantly shorten charging time.


Although the components of solid-state batteries (positive, negative and electrolyte) have been well studied in the laboratory in the future, the biggest challenge is to integrate them into a stable integrated system. It is very important to achieve high performance and long service life in as many charging and discharging cycles as possible in order to surpass the traditional lithium battery systems today.


The cooperation between Empa and Fraunhofer ISC aims at eliminating the most important technical barriers in the production of solid-state batteries.


Who are the participants?


Empa's partnership with Fraunhofer ISC, named IE4B ("Safe and Sustainable High Performance Battery Interface Project"), began on January 1, 2019 and will run for three years as part of the Fraunhofer ICON ("International Cooperation and Network") funding project. Through ICON, the Fraunhofer Institute aims to expand its strategic cooperation with selected international institutions in various fields. So far, for example, projects at Cambridge University and Johns Hopkins University have been launched.


Empa's recent IE4B project focuses on the development of solid electrolytes, the production and characterization of films with customized electronic properties, and the development of nanostructured anode materials. FraunhoferISC and its "FraunhoferResearchandDevelopmentCenterElectromobilityBavaria" are dedicated to the development of lithium conductive polymers and the protective layer of sol-gel materials with specific battery characteristics. In addition, it develops, manufactures and tests prototypes and small series batteries.


Industrial companies from Germany and Switzerland have also participated in IE4B from the outset as part of the project's steering group from an industrial perspective, including representatives of the chemical industry (such as Heraeus), mechanical engineering enterprises (such as Buhler Group), battery manufacturers such as Applied Materials (Varta) and ABB technology companies.


How to achieve the goal?


The aim of this project is to develop a solid-state battery, which can realize stable charging and discharging cycle at room temperature, and can charge rapidly at the same time.


The project is divided into two phases: the first phase involves basic aspects and uses the battery model system made by thin film method in Empa and ISC. In the first stage, the process occurring at the interface between the positive electrode, the solid electrolyte and the negative electrode should be accurately understood and monitored.


In the second stage, these experiences and technologies will be applied to the manufacture of functional solid-state batteries, which will be produced in small batches with the expertise of Fraunhofer ISC in process engineering.


"Our common goal is not only to better understand the interface, but also to be able to translate this knowledge into manufacturing processes. Fraunhoff and Empa's know-how complement each other, "explains Henning Lorrmann of the Fraunhoff ISC's Fraunhoff Bavarian Electric Vehicle Research and Development Center (FZEB).


The two-stage method has decisive advantages: as a model system in stage one, the structure of thin film battery is easier to analyze. This allows the identification of the best matched combination of electrodes and electrolytes. By matching the materials in advance, the more complex three-dimensional structure of the larger battery cell in Phase II can be easily realized.


Piealo Gr? Ning is a member of Empa's board of directors and one of the project coordinators. He stressed the strategic importance: "The structure of lithium-ion solid-state batteries is very complex and a major challenge for materials science. Through this cooperation, we will combine outstanding expertise in material science and process engineering, which is the key to the successful development of solid-state batteries.

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