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nowcold金蟲 (小有名氣)
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A stable cathode for the aprotic Li–O2 battery_P.G. Bruce 最新文章-NM 已有2人參與
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摘要： Rechargeable lithium–air (O2) batteries are receiving intense interest because their high theoretical specific energy exceeds that of lithium-ion batteries. If the Li–O2 battery is ever to succeed, highly reversible formation/decomposition of Li2O2 must take place at the cathode on cycling. However, carbon, used ubiquitously as the basis of the cathode, decomposes during Li2O2 oxidation on charge and actively promotes electrolyte decomposition on cycling. Replacing carbon with a nanoporous gold cathode, when in contact with a dimethyl sulphoxide-based electrolyte, does seem to demonstrate better stability. However, nanoporous gold is not a suitable cathode; its high mass destroys the key advantage of Li–O2 over Li ion (specific energy), it is too expensive and too difficult to fabricate. Identifying a suitable cathode material for the Li–O2 cell is one of the greatest challenges at present. Here we show that a TiC-based cathode reduces greatly side reactions (arising from the electrolyte and electrode degradation) compared with carbon and exhibits better reversible formation/decomposition of Li2O2 even than nanoporous gold (>98% capacity retention after 100 cycles, compared with 95% for nanoporous gold); it is also four times lighter, of lower cost and easier to fabricate. The stability may originate from the presence of TiO2 (along with some TiOC) on the surface of TiC. In contrast to carbon or nanoporous gold, TiC seems to represent a more viable, stable, cathode for aprotic Li–O2 cells. 文章大意在說，使用了一種新型氧正極材料：碳化鈦（TiC）。因為這種材料本身比較輕（是金的四分之一），所以相對于單純的碳材料和金，TiC更適合作為鋰空氣電池的正極材料。個人覺得Bruce，手下一幫中國人和印度人在搞，文章做來做去還是那一套，沉不下去缺乏深度，遠(yuǎn)不及A.C. Luntz（from IBM）。[ 來自小組 鋰電池世界 ] |
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2013-09-02 08:15:02, 1.37 M
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