Abstract

A lithium-ion battery made of gels and composites can be stretched to 1.5 times its original length and still work, even after 1,000-plus tugs, researchers report in a new study ( ACS Nano 2022, DOI: 10.1021/acsnano.1c08405 ). Because all the materials start as pastes, the battery can also be printed directly on fabric, says study coauthor Jeong Gon Son of the Korea Institute of Science and Technology. The new battery is the first in which every part—electrodes, separator, current collectors, and outer cover—is made of intrinsically elastic materials , Son says. The heart of the battery consists of stacked films of an organogel made of poly(vinylidene fluoride) fibers soaked in acetone. To make the cathode, Son and his colleagues add lithium iron phosphate to the gel; to make the anode, they add lithium tin oxide particles. A gel film soaked in electrolyte separates the electrodes from each other. Polyisobutylene films

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