Research and application of all solid state -Lithium - Ion Battery Equipment

Research and application of all solid state lithium battery -Lithium - Ion Battery Equipment

On June 3, 2015, under the guidance of the National Energy Administration and co sponsored by Zhongguancun Energy Storage Industry Technology Alliance (CNESA) and Dusseldorf Exhibition (Shanghai) Co., Ltd., the "Energy Storage International Summit 2015" was held in Beijing. At the sub forum of energy storage technology, Xu Xiaoxiong, a researcher of Ningbo Institute of Materials Technology and Engineering, CAS, delivered a keynote speech. The following is the content of the speech.

Xu Xiaoxiong, Researcher of Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences:

Our research institute is mainly engaged in all solid state lithium batteries in the lithium battery industry segment.

All chemical energy sources will involve safety issues. For lithium ion batteries, safety issues are also crucial. The materials of all solid state lithium batteries are relatively safe, in addition, there are few essential reactions, so the service life is expected to be much longer than that of ordinary lithium ion batteries.

Our institute has done a lot of work to solve the safety problem of lithium batteries, such as the research on electrolyte addition and membrane surface coating of lithium ion batteries, but these are all part of the solution to the safety problem. In the field of chemical energy storage, to fundamentally solve the safety problem, all solid state devices are a better research direction. The United States has made relevant plans to invest heavily in research and development of all solid polymers; According to the plan revised in 2014, Japan reinterpreted the solid state battery, and also made greater investment. The reason is that the research achievements of some Japanese enterprises have been further promoted at this stage.(Lithium - Ion Battery Equipment)

Solid state battery is to replace liquid electrolyte with solid electrolyte material to realize chemical energy storage of secondary battery. From a worldwide perspective, Japan, especially Toyota, has a relatively fast and good development in the field of solid-state batteries. According to the data in 2012, their single battery capacity has achieved relatively good cycle times; In 2014, they reported that the data achieved the discharge level of 800000 times of large capacity solid-state battery; It is expected that they will apply this technology to SUVs in 2020. The United States is also in the stage of rapid research and development in the field of solid state batteries, especially the super high mentioned energy density batteries. At present, such batteries are mainly used in high-end 3C products, including the wearables market, which will gradually increase in the future.

During the "Eighth Five Year Plan" and "Ninth Five Year Plan", China has started the research on solid state batteries. During the "Twelfth Five Year Plan", the "863 Project Team" of the Ministry of Science and Technology launched support for this research.

As the temperature of solid state battery increases, the conductivity will also increase. Based on Japanese technology, Samsung uses the heating effect of the large screen of mobile phones to improve the performance of solid-state batteries. The higher the temperature, the better the performance. In terms of technology, Europe is relatively mature. As of 2014, more than 3000 polymer energy vehicles have been running on the road, and their battery cathode uses lithium iron phosphate. At this stage, these are all successful cases based on the large-scale application of solid-state batteries.

At present, the solid battery materials with real application value include sulfide system, inorganic materials, organic materials based on ionic liquids, and PUG materials. After 2011, our research institute developed an electrolyte material that exceeded the existing lithium ion batteries. After it was applied in solid state batteries, it was found that the performance of positive electrode materials was difficult to play out, mainly because of the high resistance, and the interface optimization was needed. In terms of negative electrode, we hope to use metal as the basic material to improve the energy density of the battery and improve the processing performance.

Through our research, we found that, combined with the factors of circulation and conductivity, the influence of ionic conductivity on the electron energy density is relatively significant.

Since 2011, Ningbo Institute of Materials Technology and Engineering has made several researches based on solid state batteries: the first is the research on electrolyte materials. First, it has made oxidized electrolyte materials, which have the advantage of being relatively stable in the air. 



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