Development characteristics of solid lithium-ion batteries and related industries

It can be said that who has mastered the power battery, who has mastered the new energy vehicle. In the development of many power battery technologies, solid-state lithium batteries are regarded as the next wind, supported by a number of top experts and scholars in the world, several scientific research institutions, companies, and a large influx of research and development funds. Lithium batteries, a strategic commanding height, From technology patents to experimental mass production, a tough battle began.

Power Battery Industry into "Spring and Autumn Period"

The long-term development of the new energy automotive industry requires technological reserves. Although it is theoretically possible to significantly increase the mileage by increasing the battery load, this also increases the cost and weight of the power system. In terms of economy and safety, increasing the battery energy density is the correct choice.

There is no doubt that lithium-ion batteries will remain the best option for power, consumer electronics and small and medium-sized energy storage in the near future. According to China's "Road map for Energy Conservation and New Energy Vehicle Technology", by 2020, the energy density target for pure electric vehicle power cells is 300 Wh/kg, the target for 2025 is 400 Wh/kg, and the target for 2030 is 500 Wh/kg. Obviously, whether it is a lithium iron phosphate battery or a lithium ternary battery, it is difficult to do so.

From April to July 2017, the author was fortunate enough to participate in the research activities jointly conducted by the Power Battery Application Branch of the China Chemical and Physical Power Industry Association and the China 100 Electric Cars Association. At that time, the "solid lithium battery" was only a concept in the thinking of a few researchers in China. But at present, many companies have begun to "big move" in the solid lithium battery sector, the new energy car industry with life anxiety urgently needs solid state batteries into practical applications.

Lithium solid batteries stand out

Solid lithium-ion batteries are attractive to the industry because they are expected to address two of the "challenges" currently plaguing the power battery industry: safety hazards and low energy density.

Xiaochengwei, a researcher at the 18th Institute of China Electronic Technology Corporation, believes that the long-term industrial battery system can include solid lithium batteries, lithium sulfur batteries and lithium air batteries. As far as the current market situation is concerned, some foreign companies have developed all-solid lithium batteries with an energy density of 300-400Wh / kg, which is expected to become an important development direction for the next generation of high-energy density power and energy storage battery technology.

It is understood that, in addition to high security and high energy density, Lithium solid batteries also have a long cycle life(the thin-film all-solid lithium metal battery has been reported to be able to cycle 45,000 times), a wide range of operating temperatures(the maximum operating temperature is expected to reach 300 °C or even higher), and an electrochemical window width(possibly 5 V).), with flexible advantages (Can be prepared into thin film batteries and flexible batteries), easy to recover(theoretically no waste liquid, relatively simple to handle) and other advantages. Therefore, Xu Huacheng's reputation as Mr. Jizhuzongjianji believes that the next generation of batteries is closest to the practicality of solid lithium batteries.

In addition, some experts believe that the production equipment of solid lithium batteries has about 80 units that can be extended to traditional lithium batteries. However, there are higher requirements in the production environment. This is undoubtedly another in the process of commercialization of solid lithium batteries. A major benefit.

Domestic enterprise layouts solid state lithium battery process

Solid lithium batteries have been studied since the 1950s. However, in the early days, the electrochemical properties, safety, and engineering manufacturing of solid-state lithium batteries have not been able to meet the application requirements. In recent years, major breakthroughs have been made in solid electrolyte materials, especially sulphide electrolyte materials, and solid lithium battery technology has gradually begun to attract worldwide attention. Lithium is not easy to see in reality, but domestic companies have made substantial strides in solid lithium-ion batteries.

The battery company Shijiawei, which fired the first shot of domestic public opinion. In November 2016, Jiawei shares held a "world's first conference on solid lithium batteries and fast recharging batteries." At the end of 2017, it announced that it could mass-produce solid lithium batteries. It is understood that the electrolyte used by the company is a gel mixture(which belongs to the category of liquid lithium-ion batteries), which is also questioned by the industry as a "solid state" is not a solid lithium battery.

Yi Cheng Xineng cut into the lithium battery manufacturing process through the acquisition method. On November 24, 2017, Yi Cheng Xineng announced that it planned to acquire 70 million yuan in shares of Henan Pingneng Lithium Power Company. According to the source, Yi Cheng Xineng, a company in the photovoltaic industry with serious losses in its main industry, has only a conceptual description of the flagship solid lithium battery, but it does not have support for key data such as energy density, safety, and number of cycles. It is also difficult to express optimism in terms of project technical support.

Unlike the two companies mentioned above, the layout of the Lithium industry is more practical. On December 6, 2017, the Lithium industry issued an announcement saying that it plans to invest no more than RMB 250 million in the construction of the first-generation solid lithium battery R&D production line. It is worth mentioning that Dr. Xuxiaoxiong, a solid state battery expert and former researcher of the Institute of Materials of the Chinese Academy of Sciences, reached a strategic cooperation agreement with the Lithium industry, aiming to achieve the industrialization of solid lithium batteries within three years.

What I want to introduce here is Dr. Xuxiaoxiong, who is the head of the "All-solid Lithium-ion Storage Energy Battery" project in the "Twelfth Five-Year Plan" new energy field of the Ministry of Science and Technology. He has long been committed to the development of solid-state battery technology. Public information shows that It has so far applied for more than 30 patents(6 international patents and 27 Chinese patents), of which 11 patents have been authorized.

In addition, enterprises in the battery industry chain are also actively acting. The Ningde era, BYD, Bic Battery, Wotema, Zhongtian Technology, and Dangsheng Technology all have the layout of solid lithium batteries. Among them, in the Ningde era, relevant research and development work was carried out in the direction of polymer and sulfide-based solid-state batteries, and preliminary progress was made. Zhongtian Technology Group and the Chinese Academy of Sciences Qingdao Energy Institute signed a contract to develop high-performance all-solid lithium batteries.

The author believes that the technology accumulation of domestic enterprises in the solid lithium battery field is not as good as that of foreign giants, but the batteries and related companies that rank in the top position in China are carrying out technology reserves. The promotion of China's power battery industry in this field is at the forefront of the world. Although mass production is still unrealistic until 2020, as Academician Chenliquan of the Chinese Academy of Engineering said, "If the energy density is further increased, it must be considered from now on. Solid lithium batteries. "He said that we must strongly support the development and industrialization of solid lithium batteries, so that China's lithium battery industry from the lead. The development of solid lithium battery, urgent!

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