Dr. Chen Yufu, CTO of CeramiX, was invited to attend the second China International Solid-state Battery Industry Chain Conference. As a large-scale feast in the solid-state battery industry in 2022, this event gathered representatives from all supply-chain in the industry, covering upstream and downstream industry chain enterprises, which contains unlimited business cooperation opportunities. At the conference, Dr. Chen listened to the sharing of various industry insiders and they had enthusiastic communication. The LAGP and LATP solid electrolyte series featured by CeramiX became the focus of the conference because of its low cost and relatively mature technology accumulation. We believed that compared with the technical route of lithium sulfur solid battery, Nasicon series is most likely to be put on the market for commercial mass production in the next 2-3 years. The content of this conference is also sorted out and summarized below to share with friends who pay attention to the trend of solid state battery.

The theme of the conference is as follows:

Research on interface between Anode materials and Solid Electrolyte (Jian Liang, Shenzhen University)

This presentation covers the classification and challenges of solid electrolytes, the impact of interface modification on improving the stability of interfaces in positive materials and solid electrolytes, the impact of binder on the electrochemical performance of solid electrolytes, and the way ceramic materials are connected to polymers.

In his speech, Professor Liang pointed out that PEO dry polymer electrolytes have the advantages of high ion conduction performance, good interface contact, low mass density and low price, but have the disadvantages of low electrochemical window and low mechanical strength. Interface modification to improve the anode material and solid electrolyte interface stability is crucial to report the use of ALD on cathode material coated lithium tantalate and nano carbon, to improve the activity of interface, the other lithium niobate can effectively inhibit the decomposition of polymer solid electrolyte effect, the choice of the binder, using PAN spinning can effectively increase the membrane mechanical strength, Improve battery life.

Study on Organic Electrolytes in solid-state batteries (Guoyong Xue, Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences)

This lecture describes the challenges faced by solid-state lithium batteries:
*Difficulties in constructing ionic conductive pathways,
*Solid electrolyte materials have low ionic conductivity.
*There are many interface problems between solid electrolyte and electrode materials (poor physical contact, chemical and electrochemical instability). The team effectively solved this problem by using organic molecular cages and single-ion polymer fast conductors.

Fabrication and Ion conduction of all-solid-state battery based on Lithium Silver sulfide and Germanium Electrolyte in Wide Temperature Region (Huazhong University of Science and Technology)

This presentation gives a comprehensive introduction to Argyrodite, its synthetic modification, and the possibility of constructing all-solid-state batteries. The team increased the stability of Argyrodite using only halogen additions (chlorine being the best) and successfully produced NCM622 positive solid-state batteries with 1000 cycles. The authors also propose a theory that adjusting the particle size of solid electrolyte (positive electrode, negative electrode, thin film) at different positions can effectively increase the efficiency of the total battery.

Study on Inorganic/Polymer Composite Solid Electrolyte (Guorong Hu, Central South University)

This speech describes the development background of all-solid-state battery. The development of solid-state battery is in line with the national energy development direction and has great strategic significance. Traditional lithium ion has problems of thermal runaway, side reaction and low energy density, while solid-state battery can effectively solve the above problems. Solid state battery has the advantages of wide operating temperature range, high safety performance, wide electrochemical window, high energy density, combination of rigid and flexible, long cycle life and easy recovery. Report team put forward the concept of PEO and LLZO compound used at the same time have the flexibility of the dry polymer, also has a ceramic solid electrolytes with high conductivity, the other at 40% of electrochemical window came to 5.1 V, effectively increase the electrochemical stability, solid-state batteries and follow-up processing is difficult, of course, the interface contact problem, and so on, Solid-state batteries have a long way to go.

Study on Electrode/Electrolyte Interface Regulation and Characterization of All-solid-state Batteries (Yong Yang, Xiamen University)

The presentation described the advantages and disadvantages of all-solid-state batteries. The report team also designed all-solid-state batteries with ceramic materials. Several conclusions were drawn:
*In solid state batteries, the performance of single crystal materials with small particles is better than that of polycrystal materials.

*LATP is incompatible with lithium metal mainly because of the reduction of Ti4+ in the interface.

*In the defect of the material, especially easy to grow lithium crystal, the uniform distribution of current is an important issue to inhibit the growth of lithium crystal.

Research progress of Sulfide All-solid-state battery Technology and Materials (Institute of Physics, Chinese Academy of Sciences)

In this speech, the development of all-solid-state batteries has become a general trend, and the technical route is roughly divided into thin film all-solid-state, polymer all-solid-state

All solid sulfide and all solid oxide. The team did a series of studies with all solid sulfide, and the study showed that adding a few elemental elements can effectively improve the air stability of sulfide. Currently, the high price of sulfide solid electrolyte ($1000 /10g) is the main reason why it cannot be used on a large scale at present. The report team used liquid phase synchronous synthesis to effectively reduce the cost by about 80% and successfully completed the preparation of batch kilogram sulfide solid electrolyte, paving a bright road for large-scale use in the future.

Design of High Performance Polymer Based Solid Electrolyte and Solid State Battery (Fuzhou University, Tang Yuxin)

This presentation presents four basic challenges for the development of all-solid-state batteries: * Fast charging
*Safety performance
*Cost effectiveness
*Cycle life. The team used Lewis acid to activate PEO dry solid electrolyte, a method that allows Lewis acid to interact with anions and improve conduction efficiency.

Mechanical and Electrochemical Performance Improvement of Solid-state Lithium Battery Interface and Its Research (Harbin Institute of Technology Su Xin)

This talk covers trends and solutions in energy density for lithium batteries, as well as mechanical and electrochemical research on solid-state lithium battery interfaces. The report team points out that if the ultimate pursuit is high energy density, then lithium metal anode is the way to avoid, how to inhibit the growth of lithium crystal is the most important.

R&D and industrialization of solid state battery and key materials (Ganfeng Lithium tang Guangsheng)

This speech mainly describes the progress of the company’s product development. The future development of solid state battery will definitely be towards high safety and high energy density, which is an inevitable development trend. At present, the only possible commercialization in the world is solid-liquid hybrid lithium battery, which must continue to move towards all-solid state battery in the future.

Research and Development status and Industrialization thinking of all-solid-state Lithium battery (Chen Shaojie, HONEYCOMB Technology)

This speech is mainly about the analysis of all-solid-state battery research and development. At present, Japan and South Korea and other countries are mainly sulfide route, While China is mainly oxide solid electrolyte. According to the market size, it is predicted that in 2030, the solid-state battery market will grow to 160.1Gwh worldwide. As supporting resources and technologies mature, solid-state batteries will eventually succeed.