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Integrated and Three-Dimensional Network Structure of a SiNWs/CNTs@MOFs Composite to Enhance the Silicon Anode’s Electrochemical Performance in Lithium-Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-12 , DOI: 10.1021/acsaem.0c00260 Zhiqiang Gu 1 , Yu Miao 2 , Wenli Li 1 , Yuxi Chen 1 , Xiaohong Xia 1 , Gairong Chen 2 , Hongbo Liu 1, 2
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-12 , DOI: 10.1021/acsaem.0c00260 Zhiqiang Gu 1 , Yu Miao 2 , Wenli Li 1 , Yuxi Chen 1 , Xiaohong Xia 1 , Gairong Chen 2 , Hongbo Liu 1, 2
Affiliation
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Constructing the architectural stable silicon composite is significantly critical to enhance the Si electrode cycle life of lithium-ion batteries in which the inevitable volume expansion exerts huge mechanical stress within the Si anode, then bringing about the destruction of the silicon structure and unsatisfactory cyclic performance. In this work, we report an integrated and three-dimensional (3D) network structure of the SiNWs/CNTs@MOFs composite, prepared by a facile in situ growth method. The metal–organic framework (MOF)-derived porous coating and the 3D conducting network structure of the SiNWs/CNTs@C precursor, hand in hand, construct a structurally stable composite, with the SiNW cores fully covered by the MOF coating. Attributing to MOF-derived porous coating, high conductivity of CNTs, and the stable three-dimensional network structure, not only the transport of ions and electrons facilitates but also the stability of the structure during the electrochemical process maintains. The resulting integrated SiNWs/CNTs@MOFs composite enhances the electrode durability and presents a reversible capacity of 1223 mAh g–1 at a current density of 100 mA g–1 for 100 cycles and a rate capacity of 765 mAh g–1 at a high current density of 5 A g–1.
中文翻译：
SiNWs / CNTs @ MOFs复合材料的集成三维网络结构，可增强锂离子电池中硅阳极的电化学性能
构建稳定的建筑硅复合材料对于延长锂离子电池的硅电极循环寿命至关重要，因为不可避免的体积膨胀会在硅阳极内施加巨大的机械应力，进而破坏硅结构并降低循环性能。在这项工作中，我们报告了通过简便的原位生长方法制备的SiNWs / CNTs @ MOFs复合材料的集成三维（3D）网络结构。源自金属-有机骨架（MOF）的多孔涂层和SiNWs / CNTs @ C前体的3D导电网络结构，共同构成了结构稳定的复合材料，其中SiNW芯完全被MOF涂层覆盖。归因于MOF衍生的多孔涂层，碳纳米管的高电导率和稳定的三维网络结构，不仅促进离子和电子的传输，而且在电化学过程中维持结构的稳定性。所得的集成式SiNWs / CNTs @ MOFs复合材料增强了电极的耐用性，可逆容量为1223 mAh g–1在100 mA g –1的电流密度下进行100个循环，额定容量为765 mAh g –1，在5 A g –1的高电流密度下。
更新日期：2020-03-12
中文翻译：
SiNWs / CNTs @ MOFs复合材料的集成三维网络结构，可增强锂离子电池中硅阳极的电化学性能
构建稳定的建筑硅复合材料对于延长锂离子电池的硅电极循环寿命至关重要，因为不可避免的体积膨胀会在硅阳极内施加巨大的机械应力，进而破坏硅结构并降低循环性能。在这项工作中，我们报告了通过简便的原位生长方法制备的SiNWs / CNTs @ MOFs复合材料的集成三维（3D）网络结构。源自金属-有机骨架（MOF）的多孔涂层和SiNWs / CNTs @ C前体的3D导电网络结构，共同构成了结构稳定的复合材料，其中SiNW芯完全被MOF涂层覆盖。归因于MOF衍生的多孔涂层，碳纳米管的高电导率和稳定的三维网络结构，不仅促进离子和电子的传输，而且在电化学过程中维持结构的稳定性。所得的集成式SiNWs / CNTs @ MOFs复合材料增强了电极的耐用性，可逆容量为1223 mAh g–1在100 mA g –1的电流密度下进行100个循环，额定容量为765 mAh g –1，在5 A g –1的高电流密度下。
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