We once imagined that e-readers in the future could be as soft as paper, rolled on a pen or unrolled like a scroll, making it easier for people who like to read to travel. Nowadays, flexible screens are no longer a new technology, but how to make the battery bendable has become a technical problem. NBRC Nano Technology Co., Ltd. has developed a flexible lithium-ion battery.
Currently, in addition to the development of new high-energy-density battery material systems, the development of flexible lithium-ion batteries has also severely restricted the development and application of flexible consumer electronics products. It can be said that the breakthrough of flexible lithium-ion batteries will become the key to the development of black technologies such as wearable devices and even flexible mobile phones.
A flexible lithium-ion battery based on nanofiber reinforcement technology and 3D printing-like technology. The battery is ultra-thin and can be repeatedly bent. Its bending radius can reach 10mm and its energy density can reach more than 300Wh / L. Compared with countable similar batteries, it has better flexibility and higher energy density.
The person in charge said that the flexible battery developed by the company can be repeatedly bent more than 3,000 times, which has higher energy density and bending ability than similar products in Japan and South Korea, which makes wearable devices have longer battery life. At the same time, a series of innovative technologies such as high-capacity, high-voltage positive and high-capacity silicon-carbon negative materials, nanofibers to enhance structural stability, high-temperature-resistant separators to ensure safety, and gel electrolyte all-solid state have achieved higher levels than competitors Capacity and better flexibility.
At present, NBRC nanotechnology has combined the company's flexible lithium-ion battery and flexible ink screen to develop a fully flexible reader. This product meets the requirements of future consumer electronics for light, thin, and flexible, and its bending radius can reach 30mm. It can be unrolled and curled like a scroll. The emergence of flexible readers is undoubtedly the biggest subversion of existing portable reader products.
In terms of ensuring the safety of flexible lithium-ion batteries after repeated bending, NBRC Nanotechnology has independently developed domestically produced high-end nanofiber diaphragms. This seemingly simple diaphragm actually played a huge role in the work of lithium batteries-not only to isolate the positive and negative contacts to prevent the battery from short-circuiting, but also to ensure that lithium ions pass quickly and smoothly, which directly affects the battery's capacity, circulation, and Features such as safety performance.
In the NBRC nanotechnology production workshop, company employees are busy and orderly working next to the machinery and equipment. "It looks like ordinary filter paper, but if you magnify it tens of thousands of times, you will see another scene." The person in charge said that the thin film was evenly and finely distributed on the thin film. Thousands of micropores are hard to see with the naked eye, and the porosity is 20% higher than that of ordinary diaphragms. Through these micropores, lithium ions can “free shuttle” between the positive and negative electrode materials more quickly, significantly increasing the charge and discharge rate of the battery. In addition, the nanofiber separator has almost no shrinkage at 200 ° C, and has undergone acupuncture experiments at 560 ° C. It does not melt and deform, and its performance can meet the requirements of lithium batteries for separators, greatly reducing the risk of short-circuit explosion of power batteries and improving safety Sex.
At present, NBRC nanotechnology has formed a small-scale pilot production capacity, provided separator samples for some lithium battery and supercapacitor manufacturers, and completed preliminary evaluation and testing, and has formed sales in the special battery field.