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Si/Ag/C Nanohybrids with in Situ Incorporation of Super-Small Silver Nanoparticles: Tiny Amount, Huge Impact
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acsnano.7b08560 Shanshan Yin 1, 2 , Dong Zhao 3 , Qing Ji 1, 4 , Yonggao Xia 1 , Senlin Xia 5 , Xinming Wang 1 , Meimei Wang 1 , Jianzhen Ban 1, 6 , Yi Zhang 1, 2 , Ezzeldin Metwalli 5 , Xiaoyan Wang 1, 7 , Ying Xiao 1 , Xiuxia Zuo 1, 7 , Shuang Xie 1, 7 , Kai Fang 1, 6 , Suzhe Liang 1, 2 , Luyao Zheng 1, 7 , Bao Qiu 1 , Zhaohui Yang 8 , Yichao Lin 1 , Liang Chen 1 , Cundong Wang 2 , Zhaoping Liu 1 , Jin Zhu 1 , Peter Müller-Buschbaum 5 , Ya-Jun Cheng 1, 9
ACS Nano ( IF 15.8 ) Pub Date : 2018-01-11 00:00:00 , DOI: 10.1021/acsnano.7b08560 Shanshan Yin 1, 2 , Dong Zhao 3 , Qing Ji 1, 4 , Yonggao Xia 1 , Senlin Xia 5 , Xinming Wang 1 , Meimei Wang 1 , Jianzhen Ban 1, 6 , Yi Zhang 1, 2 , Ezzeldin Metwalli 5 , Xiaoyan Wang 1, 7 , Ying Xiao 1 , Xiuxia Zuo 1, 7 , Shuang Xie 1, 7 , Kai Fang 1, 6 , Suzhe Liang 1, 2 , Luyao Zheng 1, 7 , Bao Qiu 1 , Zhaohui Yang 8 , Yichao Lin 1 , Liang Chen 1 , Cundong Wang 2 , Zhaoping Liu 1 , Jin Zhu 1 , Peter Müller-Buschbaum 5 , Ya-Jun Cheng 1, 9
Affiliation
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Silicon (Si) has been regarded as one of the most promising anodes for next-generation lithium-ion batteries (LIBs) due to its exceptional capacity, appropriate voltage profile, and reliable operation safety. However, poor cyclic stability and moderate rate performance have been critical drawbacks to hamper the practical application of Si-based anodes. It has been one of the central issues to develop new strategies to improve the cyclic and rate performance of the Si-based lithium-ion battery anodes. In this work, super-small metal nanoparticles (2.9 nm in diameter) are in situ synthesized and homogeneously embedded in the in situ formed nitrogen-doped carbon matrix, as demonstrated by the Si/Ag/C nanohybrid, where epoxy resin monomers are used as solvent and carbon source. With tiny amount of silver (2.59% by mass), the Si/Ag/C nanohybrid exhibits superior rate performance compared to the bare Si/C sample. Systematic structure characterization and electrochemical performance tests of the Si/Ag/C nanohybrids have been performed. The mechanism for the enhanced rate performance is investigated and elaborated. The temperature-dependent I–V behavior of the Si/Ag/C nanohybrids with tuned silver contents is measured. Based on the model, it is found that the super-small silver nanoparticles mainly increase charge carrier mobility instead of the charge carrier density in the Si/Ag/C nanohybrids. The evaluation of the total electron transportation length provided by the silver nanoparticles within the electrode also suggests significantly enhanced charge carrier mobility. The existence of tremendous amounts of super-small silver nanoparticles with excellent mechanical properties also contributes to the slightly improved cyclic stability compared to that of simple Si/C anodes.
中文翻译：
原位掺入超小银纳米粒子的Si / Ag / C纳米杂化物：微量，巨大影响
硅（Si）由于其出色的容量，适当的电压曲线和可靠的操作安全性，已被认为是下一代锂离子电池（LIB）最有希望的阳极之一。然而，差的循环稳定性和适度的速率性能已成为阻碍Si基阳极的实际应用的关键缺陷。研发新策略以改善硅基锂离子电池阳极的循环性能和倍率性能一直是中心问题之一。在这项工作中，原位合成直径为2.9 nm的超小金属纳米粒子，并均匀地嵌入原位如Si / Ag / C纳米杂化物所示，形成的氮掺杂碳基质，其中环氧树脂单体被用作溶剂和碳源。与少量的Si / C样品相比，Si / Ag / C纳米杂化物仅含少量的银（2.59质量％），显示出优异的速率性能。Si / Ag / C纳米杂化物的系统结构表征和电化学性能测试已经进行。研究并阐述了提高速率性能的机制。温度相关的IV测量了含银量已调整的Si / Ag / C纳米杂化物的行为。基于该模型，发现超小银纳米颗粒主要增加了载流子迁移率，而不是增加了Si / Ag / C纳米杂化物中的载流子密度。电极内银纳米颗粒提供的总电子传输长度的评估还表明，电荷载流子迁移率显着提高。与简单的Si / C阳极相比，大量具有优异机械性能的超小银纳米颗粒的存在还有助于略微改善循环稳定性。
更新日期：2018-01-11
中文翻译：
原位掺入超小银纳米粒子的Si / Ag / C纳米杂化物：微量，巨大影响
硅（Si）由于其出色的容量，适当的电压曲线和可靠的操作安全性，已被认为是下一代锂离子电池（LIB）最有希望的阳极之一。然而，差的循环稳定性和适度的速率性能已成为阻碍Si基阳极的实际应用的关键缺陷。研发新策略以改善硅基锂离子电池阳极的循环性能和倍率性能一直是中心问题之一。在这项工作中，原位合成直径为2.9 nm的超小金属纳米粒子，并均匀地嵌入原位如Si / Ag / C纳米杂化物所示，形成的氮掺杂碳基质，其中环氧树脂单体被用作溶剂和碳源。与少量的Si / C样品相比，Si / Ag / C纳米杂化物仅含少量的银（2.59质量％），显示出优异的速率性能。Si / Ag / C纳米杂化物的系统结构表征和电化学性能测试已经进行。研究并阐述了提高速率性能的机制。温度相关的IV测量了含银量已调整的Si / Ag / C纳米杂化物的行为。基于该模型，发现超小银纳米颗粒主要增加了载流子迁移率，而不是增加了Si / Ag / C纳米杂化物中的载流子密度。电极内银纳米颗粒提供的总电子传输长度的评估还表明，电荷载流子迁移率显着提高。与简单的Si / C阳极相比，大量具有优异机械性能的超小银纳米颗粒的存在还有助于略微改善循环稳定性。
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