Recently, researchers from E01 group of Institute of physics of Chinese Academy of Sciences / Clean Energy Laboratory of Beijing National Research Center for condensed matter physics designed an integrated bipolar structure for flexible batteries and applied it to rechargeable aluminum batteries. This design fully combines the flexibility of carbon / polyethylene film and the advantages of low internal resistance and high energy density of bipolar structure, It has good corrosion resistance and easy operation, shows good electrochemical stability and flexibility, and can be directly made into watch strap to power 4V commercial electronic meters.

The vigorous development of wearable electronic devices and flexible screens promotes the continuous research on advanced flexible energy storage devices. In order to meet the dual requirements of flexibility and portability, flexible batteries need to have good flexibility, high energy density and good safety performance in electrode material selection and battery structure design.

Figure 1 Schematic diagram of wearable bipolar battery

Source: Institute of physics, Chinese Academy of Sciences, the same below

Figure 2. Electrochemical performance of single-layer rechargeable aluminum battery with carbon / polyethylene film

Figure 3.4V bipolar rechargeable aluminum battery electrochemical performance

Figure 4.10 electrochemical performance of 10V bipolar rechargeable aluminum battery

At present, most of the research on flexible battery is mainly aimed at the development of flexible materials and components. The overall structure of the battery still follows the traditional unipolar design. In order to maintain the overall flexibility, conductivity and connectivity of the battery, a large number of additional inactive components are often introduced, resulting in a significant reduction in the energy density of the battery. In view of this, according to the application characteristics of wearable battery, the innovative design of battery structure is particularly important. The Chinese Academy of Sciences has made important progress in the research of wearable bipolar rechargeable aluminum battery, which is expected to promote the further development of wearable once again.

In addition, the structure design can be assembled into a 10V bipolar rechargeable aluminum battery, which can continuously supply power to commercial LED lamps with a working voltage of 9V, and its volume is only 54% of the traditional unipolar battery in series, which provides a new idea for the development of high energy density flexible battery.

It is reported that the research results are published on ACS materials letters under the title of wearable bipolar rechargeable aluminum battery. Relevant work has been supported by national key R & D plan (2018yfb0104400), National Natural Science Foundation of China (51872322) and shell (pt76419)

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