The hidden culprit killing lithium-metal batteries from the inside First-of-their-kind snapshots reveal byproduct crippling powerful, experimental cells Katie Jungjohann, Sandia National Laboratories In this new, false-color image of a lithium-metal test battery produced by Sandia National Laboratories, high-rate charging and recharging red lithium metal greatly distorts the green separator, creating tan reaction byproducts, to the surprise of scientists. Zoom in ").addClass("image-details"); var $imageCaption = $("").addClass("image-caption").text(caption); $imageDetails.append($imageCaption); element = $(" ").append('×').append($imageHolder).append($imageDetails)[0]; img.draggable = false; if (title) { element.title = title; } if (altText) { element.alt = altText; } $(img).on("load error", callbackWrapper); img.src = url;