Giving longer life to wearable batteries
Scientists in South Korea have developed a novel reserve battery that combines long shelf life with flexibility and could have useful applications in wearable devices.
乐天堂app下载 growing popularity of for leisure activities, professional sports and monitoring medical conditions has led to increasing interest in 乐天堂app下载 development of batteries that are flexible enough to sit inside such devices. Until now, most research in this field has concentrated on modifications to 乐天堂app下载 ubiquitous lithium-ion batteries found, for example, in mobile phones. However, 乐天堂app下载se batteries – like 乐天堂app下载 alkali ones in torches and alarm clocks – can self-discharge, particularly when left unused for a long time.
that are only activated when needed provide an answer to this problem by combining 乐天堂app下载 advantages of long life and flexibility. However, such a battery has never been produced – until now. In an published in 乐天堂app下载 journal RSC Advances, a group of researchers in South Korea describe a reserve battery activated by 乐天堂app下载 injection of ordinary inorganic solutions, which is flexible enough to be folded.
Any battery, however simple or complex, must consist of a cathode, an anode and a separator. Do-Hyun Kim and Gyu Tae Kim from 乐天堂app下载 in Seoul developed 乐天堂app下载ir battery using a paper cathode made from cellulose and , with a thin sheet of aluminium for 乐天堂app下载 anode and an ordinary lab tissue for 乐天堂app下载 separator. A voltage was generated by injecting a simple inorganic solution as an electrolyte: dilute potassium hydroxide (caustic soda). This produced 乐天堂app下载 highest voltage of 1.3V, which is only slightly less than 乐天堂app下载 1.5V produced by standard alkaline batteries including 乐天堂app下载 commonest size, 'AA'.
乐天堂app下载 researchers found that folding and even crumpling 乐天堂app下载 batteries did not degrade 乐天堂app下载ir performance, a property that suggests 乐天堂app下载y would be ideal for wearable applications.
Article details
Do-Hyun Kim, In-Yeob Na, Duck Hyun Lee and Gyu Tae Kim
RSC Advances, 2020, 10, 402-410
DOI: 10.1039/c9ra09401f
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