| 查看: 869 | 回复: 2 | ||||
nowcold金虫 (小有名气)
博士
|
[交流]
A stable cathode for the aprotic Li–O2 battery_P.G. Bruce 最新文章-NM 已有2人参与
|
|
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. 文章大意在说，使用了一种新型氧正极材料：碳化钛（TiC）。因为这种材料本身比较轻（是金的四分之一），所以相对于单纯的碳材料和金，TiC更适合作为锂空气电池的正极材料。个人觉得Bruce，手下一帮中国人和印度人在搞，文章做来做去还是那一套，沉不下去缺乏深度，远不及A.C. Luntz（from IBM）。[ 来自小组 锂电池世界 ] |
回复此楼» 本帖附件资源列表
-
欢迎监督和反馈：小木虫仅提供交流平台，不对该内容负责。
本内容由用户自主发布，如果其内容涉及到知识产权问题，其责任在于用户本人，如对版权有异议，请联系邮箱：xiaomuchong@tal.com - 附件 1 : A_stable_cathode_for_the_aprotic_Li–O2_battery.pdf
2013-09-02 08:15:02, 1.37 M
» 收录本帖的淘帖专辑推荐
 锂空气电池 |
» 猜你喜欢
CTBN价位相差为何如此之大？
已经有0人回复
-
求助“Colloidal Silica”这本书电子资源
已经有0人回复
-
冶金与矿业论文润色/翻译怎么收费?
已经有70人回复
-
求助“VDI-Wärmeatlas”这本书电子资源
已经有1人回复
-
木质素颗粒SEM制样
已经有0人回复
-
0856材料306分调剂
已经有4人回复
-
非晶合金
已经有2人回复
-
材料工程,326分，求调剂
已经有6人回复
-
一志愿南昌大学085601材料专硕，四六级已过
已经有11人回复
» 本主题相关商家推荐: (我也要在这里推广)
 |
2楼2013-09-02 13:51:01
 |
3楼2013-09-03 09:23:23
