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Extra lithium-ion storage capacity enabled by liquid-phase exfoliated indium selenide nanosheets conductive network
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-05-20 , DOI: 10.1039/d0ee01052a Chuanfang (John) Zhang 1, 2, 3 , Meiying Liang 4, 5, 6, 7, 8 , Sang-Hoon Park 4, 5, 6, 7, 8 , Zifeng Lin 9, 10, 11, 12 , Andrés Seral-Ascaso 4, 5, 6, 7, 8 , Longlu Wang 12, 13, 14, 15 , Amir Pakdel 4, 5, 6, 7, 8 , Cormac Ó Coileáin 4, 5, 6, 7, 8 , John Boland 4, 5, 6, 7, 16 , Oskar Ronan 4, 5, 6, 7, 8 , Niall McEvoy 4, 5, 6, 7, 8 , Bingan Lu 12, 13, 14, 15 , Yonggang Wang 17, 18, 19, 20, 21 , Yongyao Xia 17, 18, 19, 20, 21 , Jonathan N. Coleman 4, 5, 6, 7, 16 , Valeria Nicolosi 4, 5, 6, 7, 8
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2020-05-20 , DOI: 10.1039/d0ee01052a Chuanfang (John) Zhang 1, 2, 3 , Meiying Liang 4, 5, 6, 7, 8 , Sang-Hoon Park 4, 5, 6, 7, 8 , Zifeng Lin 9, 10, 11, 12 , Andrés Seral-Ascaso 4, 5, 6, 7, 8 , Longlu Wang 12, 13, 14, 15 , Amir Pakdel 4, 5, 6, 7, 8 , Cormac Ó Coileáin 4, 5, 6, 7, 8 , John Boland 4, 5, 6, 7, 16 , Oskar Ronan 4, 5, 6, 7, 8 , Niall McEvoy 4, 5, 6, 7, 8 , Bingan Lu 12, 13, 14, 15 , Yonggang Wang 17, 18, 19, 20, 21 , Yongyao Xia 17, 18, 19, 20, 21 , Jonathan N. Coleman 4, 5, 6, 7, 16 , Valeria Nicolosi 4, 5, 6, 7, 8
Affiliation
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As a recent addition to the family of van der Waals layered crystals, indium selenide (InSe) possesses unique optoelectronic and photonic properties, enabling high-performance electronic devices for broad applications. Nevertheless, the lithium storage behavior of InSe flakes is thus largely unexplored due to its low electronic conductivity and challenges associated with its exfoliation. Here, we prepare few-layered InSe flakes through liquid-phase exfoliation of wet-chemistry-synthesized layered InSe single crystals, and percolate the flakes with carbon nanotube (CNT) networks in order to form flexible anodes to store lithium (Li). We demonstrate, with the support of CNTs, that exfoliated InSe flakes possess superior Li storage capacity to bulk InSe; the capacity increases over prolonged cycling up to 1224 mA h g−1 from 520 mA h g−1, coupled with excellent rate handling properties and long-term cycling stability. The operando X-ray diffraction results suggest that the alloying of indium with Li dominates the Li storage reactions. By combining with density-functional theory calculations and post-mortem analysis, we believe that the in situ formed indium gradually reduces the domain size, forming nanoclusters which allow the accommodation of 4 Li+ per atomic indium, and leading to extra capacity beyond the traditional theoretical value. This new “nanoscluster alloying” Li storage mechanism may inspire new architectures or methods to synthesize few-layered InSe, thereby presenting broad opportunities for high-performance Li-ion battery anode technologies.
中文翻译：
液相剥离硒化铟纳米片导电网络可实现额外的锂离子存储容量
作为范德华层状晶体家族的最新成员，硒化铟（InSe）具有独特的光电和光子特性，可实现广泛应用的高性能电子设备。然而，由于InSe薄片的低电子电导率和与其剥离相关的挑战，因此其锂存储行为在很大程度上尚未得到开发。在这里，我们通过湿化学合成的单层InSe单晶的液相剥离制备几层InSe薄片，并用碳纳米管（CNT）网络渗透薄片以形成柔性阳极以存储锂（Li）。我们证明，在碳纳米管的支持下，剥落的InSe薄片具有比散装InSe更好的Li储存能力。容量随着长时间循环而增加，最高可达1224 mA hg -1从520 mA hg -1开始，具有出色的速率处理性能和长期循环稳定性。X射线衍射的结果表明，铟与Li的合金化占Li储存反应的主导地位。通过结合密度泛函理论计算和验尸分析，我们认为原位形成的铟逐渐减小了畴尺寸，形成了纳米团簇，可以容纳每个原子铟4 Li +，并导致了超出传统技术的额外容量理论值。这种新的“纳米簇合金化”锂存储机制可能会启发新的架构或方法来合成几层InSe，从而为高性能锂离子电池阳极技术提供了广阔的机遇。
更新日期：2020-07-15
中文翻译：
液相剥离硒化铟纳米片导电网络可实现额外的锂离子存储容量
作为范德华层状晶体家族的最新成员，硒化铟（InSe）具有独特的光电和光子特性，可实现广泛应用的高性能电子设备。然而，由于InSe薄片的低电子电导率和与其剥离相关的挑战，因此其锂存储行为在很大程度上尚未得到开发。在这里，我们通过湿化学合成的单层InSe单晶的液相剥离制备几层InSe薄片，并用碳纳米管（CNT）网络渗透薄片以形成柔性阳极以存储锂（Li）。我们证明，在碳纳米管的支持下，剥落的InSe薄片具有比散装InSe更好的Li储存能力。容量随着长时间循环而增加，最高可达1224 mA hg -1从520 mA hg -1开始，具有出色的速率处理性能和长期循环稳定性。X射线衍射的结果表明，铟与Li的合金化占Li储存反应的主导地位。通过结合密度泛函理论计算和验尸分析，我们认为原位形成的铟逐渐减小了畴尺寸，形成了纳米团簇，可以容纳每个原子铟4 Li +，并导致了超出传统技术的额外容量理论值。这种新的“纳米簇合金化”锂存储机制可能会启发新的架构或方法来合成几层InSe，从而为高性能锂离子电池阳极技术提供了广阔的机遇。
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