Skip to main content

冈本视频污app在线下载

菠萝菠萝蜜视频app下载手机版
Archer
花狐狸直播app下载手机版
Lu
米老鼠直播app下载手机版
Tu

Cornell chemical engineers have achieved a breakthrough in the race for  safer, longer-lasting batteries to power the world’s automobiles, cell phones, computers and autonomous robots.

Adding certain halide salts to liquid electrolytes spontaneously creates nanostructured surface coatings on a lithium battery anode that hinder the development of detrimental dendritic structures that grow within the battery cell. The discovery opens the way potentially to extend the daily cycle life of a rechargeable lithium battery by up to a factor of 10.

The so-called dendrite problem has been troubling lithium battery technology for years. Over several charge/discharge cycles, microscopic particles called dendrites form on the electrode surface and spread, causing short circuits and rapid overheating.

“We had conflicting insight from two theories under development in the group and by theorists in the Cornell physics department, which suggested that a nanostructured metal halide coating on the anode could help a little – or a lot – in controlling the formation of dendrites. As it turns out, they work spectacularly well in solving what is widely considered a grand-challenge problem in the field,” said Lynden Archer, the William C. Hooey Director and Professor of Chemical and Biomolecular Engineering.

Archer is senior author on the paper, “Stable Lithium Electrodeposition in Liquid and Nanoporous Solid Electrolytes,” published in Nature Materials Aug. 10. The other authors are Cornell graduate students Yingying Lu in chemical and biomolecular engineering and Zhengyuan Tu in materials science and engineering.

Rechargeable lithium-based batteries are among the most versatile platforms for high-energy, cost-effective electrochemical energy storage. Consumers use these batteries every day for computers, cell phones, tablets and automobiles.

Computer makers and car manufacturers (who are striving for better batteries in electric cars) have battled metal deposition and dendrite formation on the anodes during repeated charge/discharge cycles, particularly at high rates and low temperature. A common theme that frames these efforts is that dendrites are an inherent challenge for all batteries based on lithium, sodium, aluminum and other metals, and can at best only be managed through careful design of the electrolyte and battery operating condition.

The Cornell team had a different idea. They went to “density functional theory” and “continuum analysis” – forms of chemical modeling – to examine the stability of metal electrodeposition for answers. This effort led to the conclusion that infusing simple liquid electrolytes reinforced with halogenated salt blends in a nanoporous host material holds the long-sought solution. The result: Lithium metal based batteries that exhibit stable long-term charge/recharge cycling at room temperature, with no symptoms of instability over hundreds of cycles and thousands of operating hours, the researchers reported.

Improving the efficiency of lithium in batteries couldn’t be happening at a better time; demand for the metal is expected to boom. Early in 2014, Tesla Motors, which makes a fully electric car, announced it would build a lithium battery “gigafactory.”

Concurrently, Archer says, safer batteries will also result. Dendritic structures not only lead to safety challenges through the internal shorts they can cause over time, which may lead to overheating, but they also lower a battery’s efficiency.

Archer and his team have spent two years conducting this research, which was supported by the Energy Materials Center at Cornell, an Energy Frontier Research Center funded by the U.S. Department of Energy.

图们复新瑞贸易有限公司

朝阳新吉公服务有限公司
享受直播app下载手机版 媚妹秀app下载手机版 蓝颜污app在线下载 麻豆传媒app下载手机版 樱花app污 恋人直播污app在线下载 奶茶视频污app在线下载 69视频app下载手机版 蜜蜂视频app下载手机版 蓝颜app下载手机版 朵朵直播污app在线下载 香草成视频人app污 花姿app污 MM直播污app在线下载 大西瓜视频app下载手机版 棉花糖直播污app在线下载 主播大秀app下载手机版 f2富二代污app在线下载 梦幻直播app污 鸭脖视频app污 米老鼠直播污app在线下载 红高粱直播app污 草莓直播污app在线下载 木瓜视频app下载手机版 BB直播污app在线下载 小小影视app下载手机版 黄瓜app下载手机版 葡萄视频污app在线下载 千层浪污app在线下载 年华直播app污 享爱污app在线下载 9uuapp污 卡哇伊app污 雨云直播app污 柠檬直播污app在线下载 91香蕉app下载手机版 快狐污app在线下载 初恋直播污app在线下载 小公主直播app污 丝瓜视频app下载手机版 青草视频app污 后宫视频污app在线下载 柠檬视频app污 男人本色西瓜视频污app在线下载 鲍鱼视频app污 雨云直播app污 幸福宝污app在线下载 花姬直播污app在线下载 玉米视频污app在线下载 快喵app下载手机版 茄子直播app污 小米粒直播污app在线下载 金屋藏娇直播间app下载手机版 小喵直播污app在线下载 猫咪视频app下载手机版 遇见直播app下载手机版 大象视频污app在线下载 后宫视频污app在线下载 千层浪视频app下载手机版 宅男之家app下载手机版 铁牛污app在线下载 恋人直播app下载手机版 JAV名优馆污app在线下载 水蜜桃污app在线下载 BB直播app下载手机版 快狐污app在线下载 红颜app下载手机版 萝卜视频app下载手机版 尤蜜app污 小狐仙直播app污 花椒直播app下载手机版 含羞草污app在线下载 盘她s直播污app在线下载 野花视频污app在线下载