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New flexible lithium ion battery flexes like a spine; may revolutionize wearable electronics


(Natural News) With the emergence of flexible — as in bendable — consumer electronic devices like smartphones and smartwatches, the demand has increased for similarly flexible high-performance batteries. This was the main motivation behind a study conducted by researchers from Columbia University, who now claim that they have successfully created a remarkably flexible, high energy density battery that's based on the shape of the human spine. It's the topic of a new research paper titled, "Bio-inspired, spine-like flexible rechargeable lithium-ion batteries with high energy density," which was published recently in the journal Advanced Materials.

A report on the study notes that researchers in the field have had difficulty obtaining both good flexibility and high energy density in their prototype lithium-ion batteries until this recent success. The breakthrough came from the realization that the human spine is one thing that offers the characteristics the scientists want to impart on their battery design: flexibility with high energy density, plus a stable voltage no matter how it is twisted or flexed.

According to Yuan Yang, an assistant professor of materials science and engineering at Columbia Engineering and lead author of the study, the method they devised for their prototype is such a simple yet highly effective. "The energy density of our prototype is one of the highest reported so far," he said. "We've developed a simple and scalable approach to fabricate a flexible spine-like lithium-ion battery that has excellent electrochemical and mechanical properties. Our design is a very promising candidate as the first-generation, flexible, commercial lithium-ion battery."

Their next step is to optimize the design and improve its performance.

As for how exactly the human spine factors into their prototype design, Yang said that he was able to draw inspiration from its suppleness while doing sit-ups in the gym. Since the human spine is known to be highly flexible and distortable, not to mention mechanically robust with soft marrow components that interconnect hard vertebra parts, he used it as the basis for a new design that relies on a similar structure.

As a result, Yang and his team of researchers created a prototype that has a thick, rigid section that is used to store energy by winding electrodes around a thin, flexible part. And this is where vertebra-like stacks of electrodes can be found lumped together. After testing, the researchers concluded that the new design offers excellent flexibility for the whole battery module.

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