Extraordinary lithium ion storage capability achieved by SnO2 nanocrystals with exposed {221} facets†,Nanoscale

当前位置： X-MOL 学术 › Nanoscale › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Extraordinary lithium ion storage capability achieved by SnO2 nanocrystals with exposed {221} facets†
Nanoscale ( IF 5.8 ) Pub Date : 2018-08-08 00:00:00 , DOI: 10.1039/c8nr04513e
Bomin Li _{1,

2,

3,

4,

5} , Yan Yan _{1,

2,

3,

4,

5} , Chentong Shen _{1,

2,

3,

4,

5} , Yang Yu _{1,

2,

3,

4,

5} , Qinghong Wang _{1,

2,

3,

4,

5} , Mingkai Liu _{1,

2,

3,

4,

5}

Affiliation

Rational design of SnO₂ nanomaterials with superior architectures and excellent electrochemical properties is highly desirable for lithium ion storage. Here, several SnO₂ nanoparticles with different exposed crystal planes, such as {101}, {110} and {221} facets, are developed and further embedded into graphene/carbon nanotube (G/CNT) networks, achieving highly conductive carbon/SnO₂ films (C/SnO₂) with homogeneous dispersion of SnO₂ nanoparticles. Three-dimensional (3D) G/CNT networks with highly porous structures and electronic contacts with imbedded SnO₂ nanoparticles provide excellent pathways for transfer of electrons and ions and further buffer structural changes of SnO₂ nanocrystals during lithium-ion insertion/extraction processes. Close contact between G/CNT matrix and embedded SnO₂ nanoparticles ensures that all high-energy {221} facets of SnO₂ are exploited during rapid electrochemical reactions. The high electrical conductivity of G/CNT networks can further prevent pulverization of nanostructured SnO₂. As a result, C/SnO₂ film with 90% content of octahedral SnO₂ nanocrystals (C/SnO₂-O (90%)) exhibits superior reversible specific capacity of 1008 mA h g⁻¹ at 0.1 A g⁻¹, excellent rate capability, low internal resistance and long-term cycling stability for 1000 cycles. These results further confirm that SnO₂ nanocrystals with high-energy {221} facets can provide numerous active sites for lithium ion storage than other SnO₂ nanomaterials.

中文翻译：

具有{221}裸露面的 SnO ₂纳米晶体实现了非凡的锂离子存储能力†

具有优异的结构和优异的电化学性能的SnO ₂纳米材料的合理设计对于锂离子存储是非常需要的。在这里，开发了几种具有不同暴露晶面的SnO ₂纳米粒子，例如{101}，{110}和{221}面，并将其进一步嵌入到石墨烯/碳纳米管（G / CNT）网络中，从而实现了高导电性的碳/ SnO _2个薄膜（C / SnO ₂），具有均匀分散的SnO ₂纳米颗粒。具有高度多孔结构的三维（3D）G / CNT网络以及与嵌入的SnO ₂纳米粒子的电子接触为电子和离子的转移以及进一步缓冲SnO的结构变化提供了绝佳的途径锂离子插入/提取过程中出现_2个纳米晶体。G / CNT基质与嵌入的SnO₂纳米颗粒之间的紧密接触可确保在快速电化学反应过程中充分利用SnO_2的所有高能{221}面。G / CNT网络的高电导率可以进一步防止纳米结构SnO_2的粉化。结果，具有90％的八面体SnO₂纳米晶体（C / SnO₂ -O（90％））的C / SnO₂膜在0.1 A g^-1下表现出1008 mA hg^-1的优异可逆比电容。，出色的倍率能力，低内阻和1000次循环的长期循环稳定性。这些结果进一步证实，具有高能量{221}面的SnO ₂纳米晶体可以比其他SnO ₂纳米材料提供许多用于锂离子存储的活性位点。

更新日期：2018-08-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11