3.2v 50ah lifepo4 battery.Development of solar cells as soft as hair

　　It is possible to generate electricity and store energy on a fiber that is only one hundred thousandth of a human hair. Can it be woven into clothes and worn on the body? Recently, the cover article of Angewandte Chemie International Edition, an authoritative journal in the field of original research, published the latest research results of Professor Peng Huisheng’s research group in the Department of Polymer Science at Fudan University. In 2006, after graduating from the United States with a Ph.D., Peng Huisheng joined the Los Alamos National Laboratory of the U.S. Department of Energy. Two years later, he returned to Fudan University from the United States and continued to engage in carbon nanotube-related research. However, the focus of research has shifted from the material structure itself to utilizing its electrical properties. According to Professor Peng Huisheng, "The most intuitive concept of nanometers is one hundred thousandth of a hair. If one-nanometer-diameter balls are used to pile up one-millimeter-diameter balls, its surface area can be increased by 10 to the fifth power." This is a "from small to large" method. The principle is the same as the catalysis in petrochemical industry. The larger the surface area of the catalyst, the better the effect. Peng Huisheng applied this design to the photoelectric conversion of carbon nanotubes. "The United States uses this material to make space elevators." Because she once worked at the Los Alamos National Laboratory of the U.S. Department of Energy, Peng Huisheng is very familiar with the related application fields of carbon fiber tube materials. "What is the use of this material? Let me give you an example, the first generation body armor It is made of steel plates, and a piece of clothing weighs more than 20 kilograms. In the 1970s, DuPont developed Kevlar fiber material (Kevlar), whose tensile strength is five times that of steel, and the third generation of body armor is made of carbon nanotube fibers. of". Yang Zhibin, a student from Peng Huisheng’s research group, gave a live demonstration, using a carbon nanotube fiber that was almost invisible to the naked eye like a spider web to hang a ballpoint pen. Yang Zhibin told reporters present, "To lift a two-ton car, carbon nanotube fibers with a diameter of 5 mm are enough." In the science fiction novelist Liu Cixin's "Once Upon a Time on Earth Trilogy" series "The Three-Body Problem", people can travel over the earth through a space elevator. Some readers commented that this is "challenging the limits of readers' imagination." However, according to a report in the British "Daily Mail" on August 29, 2012, the Elevator Port Group Company in California, USA, stated that this idea can become a reality within 8 years. "The United States uses this material to make space elevators." Peng Huisheng said that the biggest feature of carbon nanotube fiber is that it is very light and very strong. New solar cells as soft as hair Experts responsible for the review of "Applied Chemistry" believe that Peng Huisheng's research team used a "very simple and low-cost method" to "achieve simultaneously photovoltaic and photovoltaic cells on one fiber for the first time in the world" Conversion and energy storage", which greatly improves the utilization efficiency of solar energy and "takes a key step towards the development of all-fiber energy systems." The design based on nano-curvature is like stacking many small balls into one big ball. "The surface area changes from small to large, which is conducive to the rapid propagation of charges, thereby greatly enhancing the conductive properties of the material." Moreover, due to the carbon nanotube fiber With good flexibility, it will break the rigid "planar structure" of traditional solar cells. According to the experimental results, the newly developed solar cell has a maximum photoelectric conversion efficiency of more than 9%. But what happens when it generates electricity during the day? "We were wondering if we could integrate power generation and energy storage. We could use it when we want to use it, put it there if we don't want to use it, and store the rest." So, using the same fiber material, Professor Peng's research team constructed Micro linear supercapacitors successfully realized this idea. In addition, the soft fiber battery is woven. Peng Huisheng told reporters, "One of the recent research we did is to weave solar cells into clothes. We hope that in the future, ordinary clothes will not only be bulletproof, but also generate electricity and store energy." Peng Huisheng said that carbon nanotubes are at the forefront in the development of energy, but it is still difficult to scale up production and large-scale preparation. "Because it has just started, through research, we should be able to solve these problems one by one." He said he didn’t know how many years it would take before electronic devices made of these materials could be easily used, but new materials are a very important driving force in changing the entire society, and carbon nanotubes are a very interesting material, “It’s just a It has started and opened up a new direction of development, and this road is feasible."

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