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\"The Wandering Earth\" became extremely popular on social media during the Spring Festival, and Chinese film fans who adore science fiction blockbusters finally got to show off their enthusiasm; it is regarded as the beginning of China’s science fiction era. Regardless of what the online reviews said, thanks to Wu Jing’s reputation and Ng Man-tat’s acting skills, I immediately bought popcorn and went to the cinema. http://www.cmiw.cn/data/attachment/forum/201905/12/065040p31get0n76qq7ng2.jpg How can we save Earth from destruction without high-quality materials? Stunningly beautiful mecha skeleton protective suits, super-scifi star-shaped engines, and high-speed transport vehicles – in extreme environments, none of these can function without high-quality steel. http://www.cmiw.cn/data/attachment/forum/201905/12/065041o9lipi6nlflili9j.jpg But today we’re looking at stainless steel foil that is sold by weight and whose appearance cannot be seen. Stainless steel foil for high-energy batteries. In the film, Han Ziangang (played by Wu Mengda) removes his protective helmet due to a lack of oxygen, and he freezes instantly. Given such a large temperature difference between the inside and outside, and the rapid rate of freezing, it is clear that protective suits require a certain amount of energy to maintain an internal temperature balance. http://www.cmiw.cn/data/attachment/forum/201905/12/065041hkfinhfugl55wkf8.jpg From the perspective of portability and development over the next few decades, this type of energy is most likely to come from high-capacity, lightweight, and safe rechargeable batteries, and stainless steel foil is one of the best materials for manufacturing such batteries. In 2013, Nippon Steel announced the development of stainless steel foil for lithium-ion rechargeable batteries. The company’s stainless steel foil comes in two product lines: the \"LAMINELIGHT\" composite stainless steel foil, which is suitable as a material for the outer casing of batteries and capacitors and features a resin film coating (with a substrate thickness of 15μm, or 0.015mm) ； http://www.cmiw.cn/data/attachment/forum/201905/12/065042d1cbacccp7rvuclw.jpg http://www.cmiw.cn/data/attachment/forum/201905/12/065042igslgwgosg5dd72j.jpg Lithium-ion rechargeable batteries that use the stainless steel foil \"LAMINELIGHT\" feature \"high-strength, ultra-thin rolled stainless steel foils\" for the positive and negative current collectors of these batteries; the thickness of the substrate is 10μm, or 0.01mm. http://www.cmiw.cn/data/attachment/forum/201905/12/065042vjxgjxg8mg3ocgkh.jpg \"High-strength ultra-thin rolled stainless steel foil\" used for current collectors. Stainless steel foil serves as the outer material to replace aluminum casings in square battery cells, as well as aluminum foil in laminated battery cells. Compared to aluminum alloys, stainless steel has higher strength and stiffness, thus it has a greater capacity to withstand external impacts. It can also reduce the battery expansion caused by changes in internal pressure to less than 1/3 of that observed when aluminum foil was used. http://www.cmiw.cn/data/attachment/forum/201905/12/065042khccgovv9fzyvzc4.jpg In the video, people are wearing protective gear and exposed to various intense impacts as well as environments with temperature differences of 100°C; stainless steel foil is essential for such situations. Furthermore, stainless steel possesses excellent electrical properties and chemical stability; it does not react with lithium ions in the electrolyte and thus does not deteriorate, making it an outstanding material for use in sealed enclosures. These excellent features make them suitable for use in vehicle batteries. Stainless steel foil for flexible display substrates: Stainless steel foil is not only used in the production of batteries; it is also essential for the flexible displays and paper-based electronic reading devices that appear in many science fiction films. This flexible display technology based on stainless steel foil (with a thickness of 0.008 mm) has already been developed, but it will take some time before it becomes widely available for consumer use. http://www.cmiw.cn/data/attachment/forum/201905/12/065042ohqh0llhh6zqohbc.jpg Flexible display screens. http://www.cmiw.cn/data/attachment/forum/201905/12/065524qpmjeblyh7cclhuy.jpg Paper-based electronic reading materials. Stainless steel foil can be used in flexible displays due to its properties such as resistance to high-temperature processing, water resistance, oxidation resistance, high strength, and low thermal expansion coefficient. The wide range of applications for ultra-thin stainless steel: Stainless steel with a thickness of ≤ 0.3 mm, or even as thin as 0.01 mm, is considered ultra-thin stainless steel. This type of steel is characterized by a small number of different products, strict quality requirements, high technical standards, and a high added value; it is therefore often used in various high-end industries. The application areas of ultra-thin stainless steel are shown in the table below: http://www.cmiw.cn/data/attachment/forum/201905/12/065043ijow6dkpzunnnich.jpg http://www.cmiw.cn/data/attachment/forum/201905/12/065043j1jakgzsw9592z3a.jpg It is precisely because ultra-thin stainless steel and stainless steel foil are widely used in high-end technological fields, and these applications are related to the development of technology, that Taiyuan Iron and Steel Company, a leading enterprise in the stainless steel industry, developed stainless steel foil with a thickness of only 0.02 mm and a width of 600 mm in 2018. http://www.cmiw.cn/data/attachment/forum/201905/12/065043zg11lclod6cld2az.jpg Previously, this high-end variety was for a long time monopolized by a few countries such as Japan and Germany. Therefore, if we want to move Earth through space and be the leading country in this endeavor, we cannot do without high-quality stainless steel foil. Transferred from “Zhi Gang”