Is CR2032 button cell "hidden clumsiness" a technical trap?

　　It has to be admitted that as one of the largest battery exhibitions in the world, the Japan Battery Exhibition brings together secondary batteries, capacitors, various related high-end technologies, materials, components and advanced equipment used to produce and develop secondary batteries and capacitors. To a certain extent, this exhibition represents the technological trend of secondary batteries.

　　But judging from the scene, it is different from the "technical feast" expected by industry insiders. Compared with previous years, the lithium battery field is much deserted. Japanese lithium battery giants such as Sony, Panasonic (only displaying fuel cell products), and Yuasa None of them attended, and Japan's far-leading solid-state battery technology did not show much.

　　On the contrary, in the field of fuel cells, it is truly worthy of the word "feast". The industrial chain at the exhibition is also very complete, from materials, parts manufacturing, battery manufacturing, battery testing, application, hydrogen production, and hydrogen supply systems, almost everything is available. All the industry contents that come to mind are exhibited.

　　It is worth mentioning that Japan has not only completed the construction of 6,191 hydrogenation stations in the country, but also companies in almost every place in Japan are developing fuel cells and actively participating in large and small exhibitions.

　　Although there is the possibility that Japan deliberately hides and creates false impressions, at least on the surface, Japan as a whole appears to be heavy on fuel cells and light on lithium batteries.

　　In contrast to the shrinkage of Japanese lithium batteries, Chinese lithium batteries have frequently appeared in Japanese battery exhibitions, and their booth occupancy is astonishingly high. In fact, since 2015, the participation rate of Chinese companies has gradually increased. In the last two editions, most of the companies and personnel are from China. During the exhibition, you can hear familiar Chinese everywhere. To put it bluntly, it feels like walking into most international tourist areas, full of Chinese tourists.

　　Regardless of whether Japan is clumsy in lithium battery technology, the fact before us is that China's lithium battery industry has risen. But what the author wants to emphasize is that the rise of industry does not mean the rise of technology. In terms of lithium battery R&D technology alone, there is still a huge gap between China and Japan. If we do not move from industry leadership to technology leadership, the so-called overtaking of new energy will be nowhere. .

　　Let’s take a look at what new technologies and major events are happening in the lithium battery field this week.

　　1. Sekisui Chemical Industry develops 40Ah soft pack fast-charging battery

　　According to Japanese media reports, Sekisui Chemical Industries will enter the field of automotive batteries and will publicly announce for the first time the lithium battery under development by the company at the "International Secondary Battery Exhibition" held in Tokyo from February 28 to March 2, 2018. Ion soft pack batteries are expected to achieve mass production and commercial application in 2020. Compared with other competitors targeting the same market, the company started relatively slowly, but they hope to improve safety and battery output power through its unique technology , forming differentiated products.

　　The product developed by the company is a soft-pack battery with a capacity of 40Ah and a size of 118×340mm. Dozens of batteries are combined into modules, and multiple modules are combined into battery packs, so one vehicle will carry hundreds of batteries. battery.

　　Previously, Sekisui Chemical Industry had experience in mass-producing stationary lithium-ion batteries for household use. Although some of these technologies were also used in the development of new products, Mr. Da Tetsu, who is in charge of the battery development business, said that they are targeting It is to develop a battery that has not yet appeared on the market, so the chemical properties inside the newly developed product will change dramatically. Although no technical details have been disclosed, it appears to use an electrolyte material that moves electrons more easily than conventional products, as well as an insulating layer provided on a separator material located between the positive and negative electrodes. As a result, safety is enhanced, output power is improved, fast charging and other product performance are listed as competitive keywords.

　　Comment: The 40Ah soft-pack battery is not actually a far-reaching technological achievement, but if it takes into account the cycle life, safety, and rate capability, it can be regarded as a very competitive product. . In fact, not many new lithium battery technologies emerged from the beginning to the end of this Japan Battery Show, and the overall situation was relatively indifferent. On the contrary, the field of fuel cells showed a thriving situation. This may be a sign of technological evolution, but At the same time, it may also be a technical trap deliberately "hiding clumsiness" by Japan.

　　2. South Korea has developed a hybrid aqueous solution battery that can be charged within 30 seconds.

　　The Korea Advanced Institute of Science and Technology (KAIST) has developed the latest water-based hybrid battery, which is safe and has high energy and power density. It can be charged in just 20 seconds. It consists of a liquid electrolyte sandwiched between a specially designed anode. and the cathode. The anode is made of a graphene-based polymer chain material, which gives it a high surface area, allowing it to store more energy. The cathode material consists of nickel oxide nanoparticles embedded in graphene.

　　Because the materials are arranged in these structures, the new devices have higher energy density and faster energy exchange than other aqueous batteries. It is much more stable with minimal energy loss, maintaining close to 100% capacity after more than 100,000 redox cycles. The new device also has about 100 times higher power density than similar designs and can be charged in 20 to 30 seconds using low-power systems such as traditional USB chargers.

　　Comment: I have to admit that South Korea has made great efforts in graphene batteries. Although no graphene battery has been truly applied in the industrial field, in terms of research and development, new technological breakthroughs can be seen from time to time. news. It is not difficult to guess that graphene batteries occupy an important position in South Korea's new energy planning, but it is difficult to say whether this graphene battery, which is dismissed by most people, really has a way out.

　　3. Honda commercializes magnesium batteries and wants to replace lithium batteries?

　　Recently, Honda announced that they have developed the world's first magnesium rechargeable battery that can be used in practical applications in cooperation with the Saitama Prefecture Industrial Technology Comprehensive Center. Honda hopes to commercialize magnesium batteries in 2018 and completely replace lithium batteries.

　　Magnesium-ion batteries have a greater energy storage capacity than lithium-ion batteries, which is about four times that of commercial lithium-ion batteries. They can enable consumer electronics products to be used for longer periods of time and cars to travel longer distances.

　　At the same time, using magnesium as the negative electrode will not produce dendrites during repeated charging and discharging, so the cycle performance is very excellent and the loss after repeated charging and discharging is small. Some academic materials even claim that magnesium-ion batteries are the most theoretically promising green batteries for electric vehicles so far. They can not only increase the cruising range, but also greatly improve the acceleration performance of the vehicle. It will be a new game. revolution in energy utilization.

　　On the other hand, magnesium batteries are safer than lithium and are not as prone to fire hazards as lithium batteries, and the cost of magnesium is 96% lower than lithium. Researchers at the Saitama Prefecture Industrial Technology Comprehensive Center said they are conducting research on magnesium batteries. After conducting technical performance evaluation, they believe that magnesium batteries are as good as lithium batteries in terms of lifespan and safety performance. They hope to actively cooperate with multiple battery manufacturers to achieve mass production as soon as possible.

　　Comment: Unfortunately, it was Japan rather than China that took the lead in commercializing magnesium batteries. You must know that almost all global magnesium resources are concentrated in China. Magnesium replacing lithium is what domestic battery companies are most happy to see. However, although magnesium replacing lithium is a huge benefit, the author is not optimistic about magnesium, as well as other alkaline metal ion batteries such as sodium and potassium. In fact, lithium batteries stand out from competition with several other secondary batteries and are widely used. I will not go into details for the reasons. The sequence on the periodic table of elements, to some extent It's kind of an answer.

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