What Are The Functional Advantages Of Solid-state Batteries? What Are The Factors Preventing It From Being Commercialized?

- Dec 21, 2019-

Solid-state batteries will be the disruptors of ternary batteries. Zhang Xiang, a car expert at the Training Center of the National Ministry of Industry and Information Technology, once said that he thought that solid-state batteries would become a weapon for electric cars to replace traditional fuel cars. Now, the industrialization process of solid-state batteries is accelerating, and the enthusiasm of enterprises for investment is also heating up.

Solid-state battery will usher in a small climax of production

Recently, Huineng Technology and Nandu Power have reached a preliminary agreement on a solid-state battery production technology authorization cooperation case. Huineng Technology authorized the production of solid-state battery cells with an energy density of about 240Wh / kg to Nandu Power, and provided the central equipment and Data, and Nandu Power will build the country's first 1GWh planned solid-state battery production line.

Prior to this, Yang Sihuan, CEO of Huineng Technology, has stated that it will adopt a Qualcomm-like business form and authorize the patented skills of solid-state batteries and production equipment for mass production to battery factories and car companies. Yang Simiao pointed out proudly: After the form of IP authorization, the time for the industry to develop solid-state batteries can be shortened. We are confident that Huineng's solid-state battery skills will gradually spread globally in two to three years.

Battery China.com has learned that Huineng Technology actually completed the mass production of solid-state batteries as early as 2013, but it is mainly used in the field of consumer electronics. In the past two years, it has accelerated the layout of new energy cars. Huineng Technology's G1 factory built in Taiwan in 2013 is the world's first production line that can complete the production of solid lithium battery coils, and plans to complete the expansion of 1GWh at the end of 2019, when the total solid-state battery production capacity will reach 1.5 ~ 2GWh .

Solid-state battery proposes ternary attack

The reason why solid-state batteries are widely regarded in the industry is because of their excellent functional advantages. As leaders in the field of power batteries, both Japan and China plan to increase the energy density of power battery cells to 500Wh / kg by 2030. In theory, the limit energy density of traditional liquid electrolyte lithium batteries cannot be higher than 500Wh / kg, and the energy density of all-solid-state batteries can now reach 400Wh / kg, and the estimated maximum potential value can be as high as 900Wh / Kg.

In addition, in addition to the limitation of energy density, the current mainstream ternary lithium battery safety issues are also more prominent. Regardless of the chemical structure or the battery structure, the ternary data is very simple to generate heat and there is a danger of explosion. However, at this stage, there is no perfect solution. Qi Lu, director of Peking University's New Energy Materials and Skills Lab, stated. The advantages of solid-state batteries in terms of safety are very obvious. The solid-state electrolyte is non-flammable, non-corrosive, non-volatile, and does not leak. The probability of spontaneous combustion of cars equipped with solid-state batteries will be greatly reduced.

However, there are also many obstacles to the commercialization of solid-state batteries. It is understood that the solid electrolyte has a large interface resistance with the electrode and poor interface compatibility. At the same time, the volume expansion and shortening of various materials during the charge and discharge process cause problems such as simple interface separation. As Xiang Jin, executive director of Jiangsu Weilan said, the main problem of solid-state batteries is still the interface problem.

LEK (Ai Yikai) consulted with our regional partner and head of the industrial and high-tech field. Teng Yong also thought that the development of solid-state batteries still faces the technical bottleneck of low ion conductivity and high interface impedance. Yuan lithium battery system.

However, Teng Yong's view is still more philosophical, thinking that in terms of both energy density and safety functions, the advantages of solid-state battery skills are very significant. He estimates that solid-state batteries will begin commercial use between 2023-2025 and planned mass production by 2025-2030.

However, Shi Chenxing, a veteran of industry research in China, believes that the future development of new batteries such as solid-state batteries will go through the following stages: high-nickel anode + quasi-solid electrolyte + silicon-carbon anode to complete 300Wh / Kg by 2020, and lithium-rich by 2025 The positive electrode + all solid electrolyte + silicon carbon / lithium metal negative electrode battery completed 400Wh / Kg, and the fuel / lithium sulfur / air battery completed 500Wh / Kg before 2030.

Although the commercialization process of solid-state batteries is still a long way off, ternary batteries will also occupy the C position of the power system of new energy cars for a long time, but the battle has now begun, and solid-state batteries are now blowing to the ternary battery position Charge!