| 标题 | Layered double hydroxide nano- and microstructures grown directly on metal substrates and their calcined products for application as Li-ion battery electrodes |
| 作者 | 黄新堂 |
| 日期 | 2008 |
| 出处 | Advanced Functional Materials |
| 关键词 | LDH nano micro metal substrate calcined product battery electrode |
| 摘要 | Layered double hydroxide (LDH) nano- and microstructures with controllable size and morphol. have been fabricated on "bivalent metal" substrates such as zinc and copper by a one-step, room-temp. process, in which metal substrates act as both reactants and supports. By manipulating the concn. of NH{\dn4\fs20 3}{\f4 讅H{\dn4\fs20 2}O, the thickness and lateral size of the LDH materials can be tuned from several tens of nanometers to several hundreds of nanometers and from several hundreds of nanometers to several micrometers, resp. This method is general and may be readily extended to any other alkali-resisted substrate coated with Zn and Cu. As an example, Zn-covered stainless steel foil has been shown to be effective for the growth of a Zn-Al LDH film. After calcinating the as-grown LDH at high temp. (650 {\f4 皚C) in argon gas, a ZnO/ZnAl{\dn4\fs20 2}O{\dn4\fs20 4} porous nanosheet film is obtained, which is then directly used for the first time as the anode material for Li-ion batteries with the operating voltage window of 0.05-2.5 V (vs. Li). The result demonstrates that ZnO/ZnAl{\dn4\fs20 2}O{\dn4\fs20 4} has higher discharge and charge capacities and considerably better cycling stability compared to pure ZnO (Li insertion/extn. rate: 200 or 500 mA g{\up4\fs20 -1}). The improved electrochem. performance can be ascribed to the buffering effect of the inactive matrix ZnAl{\dn4\fs20 2}O{\dn4\fs20 4} by relieving the stress caused by the vol. change during charge-discharge cycling. This work represents a successful example for the development of promising ZnO-based anode materials for Li-ion batteries. |
| 单位: | 基科部办公室 |
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