Novel strategy for the preparation of graphene-encapsulated mesoporous metal oxides with enhanced lithium storage

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• 作者：Rong Lin ; Wenbo Yue ; ^{wbyue@bnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Fangzhou Niu ; Jie Ma
• 关键词：Graphene ; Mesoporous silica ; Mesoporous metal oxide ; Lithium-ion battery
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 July 2016
• 年：2016
• 卷：205
• 期：Complete
• 页码：85-94
• 全文大小：4345 K

文摘

As potential anode materials for lithium-ion batteries, mesoporous metal oxides show high reversible capacities but relatively poor cycle stability due to the structural collapse during cycles. Graphene-encapsulated mesoporous metal oxides may increase the electronic conductivity of the composite as well as stabilize the mesostructure of metal oxides, thereby enhancing the electrochemical performance of mesoporous metal oxides. Herein we describe a novel strategy for the preparation of graphene-encapsulated mesoporous metal oxides (SnO₂, Mn₃O₄), which exhibit superior electrochemical performance compared to pure mesoporous metal oxides. Moreover, some mesoporous metal oxides may be further reduced to low-valence metal oxides when calcined in presence of graphene. Mesoporous metal oxides with high isoelectric points are not essential for this synthesis method since metal oxides are connected with graphene through mesoporous silica template, thus expanding the types of graphene-encapsulated mesoporous metal oxides.