The rapid development of electronic products that are flexible and wearable (also known as wearables) are giving rise to an interesting range of applications, from watches to smart and flexible screens, like smart phones, tablets and TV, to tissues, crystals, patches, and smart sensors. This has led to an increase in the demand for batteries flexible, high-performance. However, until recently, experts had difficulties to obtain simultaneously a good index of flexibility and a high energy density in lithium-ion batteries.
Now, a team led by Yuan Yang, of the University of Columbia, has developed a prototype that addresses this challenge: a button-shaped lithium battery of the human spine that allows a flexibility remarkable, high-energy density and stable voltage, no matter how you bend or turn. The results have been published in Advanced Materials.
“The energy density of our prototype is one of the highest identified to date – explains Yang in a press release –. We have developed a simple approach, and suitable to produce large-scale a lithium-ion battery and flexible, similar to the column that has excellent electrochemical properties and mechanical. Our design is a candidate very promising in terms of battery flexible. We are currently optimizing the design and improving its performance”.
Yang, whose group explores the composition and structure of the materials of the battery to obtain a high-performance, is inspired by the flexibility of the spine while doing squats at the gym. The human spine is highly flexible, as well as mechanically robust because it contains components of marrow soft that interconnect the hard parts of the vertebra. Yang used this model to design a battery with a similar structure. Your prototype has a segment thick and rigid that stores energy by winding the electrodes (the vertebrae) around an area thin and flexible (the cord). The design provides excellent flexibility for the entire battery.
“As the volume of the rigid part of the electrode is significantly greater than the flexible interconnection –concludes Yang–, the energy density of a battery so flexible it can be greater than 85% of a conventional battery. Due to the high proportion of active materials in the entire structure, our battery displays an energy density very high, higher than any other report of which we have knowledge. The battery also survived with success to a tough test of dynamic mechanical load due to our design biomimetic”.
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