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Bismuth Telluride Nanoplates Hierarchically Confined by Graphene and N-Doped C as Conversion-Alloying Anode Materials for Potassium-Ion Batteries
Small ( IF 13.0 ) Pub Date : 2023-07-13 , DOI: 10.1002/smll.202303985 Shaokun Chong 1, 2 , Lingling Yuan 1 , Qianwen Zhou 1 , Yikun Wang 1 , Shuangyan Qiao 1 , Ting Li 1 , Meng Ma 1 , Bingyang Yuan 1 , Zhengqing Liu 1
Small ( IF 13.0 ) Pub Date : 2023-07-13 , DOI: 10.1002/smll.202303985 Shaokun Chong 1, 2 , Lingling Yuan 1 , Qianwen Zhou 1 , Yikun Wang 1 , Shuangyan Qiao 1 , Ting Li 1 , Meng Ma 1 , Bingyang Yuan 1 , Zhengqing Liu 1
Affiliation
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Potassium-ion batteries (PIBs) have broad application prospects in the field of electric energy storage systems because of its abundant K reserves, and similar “rocking chair” operating principle as lithium-ion batteries (LIBs). Aiming to the large volume expansion and sluggish dynamic behavior of anode materials for storing large sized K-ion, bismuth telluride (Bi2Te3) nanoplates hierarchically encapsulated by reduced graphene oxide (rGO), and nitrogen-doped carbon (NC) are constructed as anodes for PIBs. The resultant Bi2Te3@rGO@NC architecture features robust chemical bond of Bi─O─C, tightly physicochemical confinement effect, typical conductor property, and enhanced K-ion adsorption ability, thereby producing superior electrochemical kinetics and outstanding morphological and structural stability. It is visually elucidated via high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) that conversion-alloying dual-mechanism plays a significant role in K-ion storage, allowing 12 K-ion transport per formular unit employing Bi as redox site. Thus, the high first reversible specific capacity of 322.70 mAh g−1 at 50 mA g−1, great rate capability and cyclic stability can be achieved for Bi2Te3@rGO@NC. This work lays the foundation for an in-depth understanding of conversion-alloying mechanism in potassium-ion storage.
中文翻译：
石墨烯和氮掺杂碳分级限制的碲化铋纳米片作为钾离子电池的转化合金阳极材料
钾离子电池（PIB）因其丰富的K储量以及与锂离子电池（LIB）类似的“摇椅式”工作原理，在电能存储系统领域具有广阔的应用前景。针对存储大尺寸钾离子的负极材料体积膨胀大、动态行为迟缓的问题，构建了还原氧化石墨烯（rGO）和氮掺杂碳（NC）分层封装的碲化铋（Bi 2 Te 3 ）纳米片作为 PIB 的阳极。所得的Bi 2 Te 3 @rGO@NC结构具有坚固的Bi─O─C化学键、紧密的物理化学限制效应、典型的导体特性和增强的K离子吸附能力，从而产生优异的电化学动力学和出色的形态和结构稳定性。通过高角度环形暗场扫描透射电子显微镜（HAADF-STEM）直观地阐明了转化合金双机制在 K 离子存储中发挥着重要作用，允许使用 Bi 作为每个分子式单元传输 12 K 离子氧化还原位点。因此，Bi 2 Te 3 @rGO@NC在50 mA g -1下具有322.70 mAh g -1的高第一可逆比容量、良好的倍率性能和循环稳定性。这项工作为深入了解钾离子储存中的转化合金化机制奠定了基础。
更新日期：2023-07-13
中文翻译：
石墨烯和氮掺杂碳分级限制的碲化铋纳米片作为钾离子电池的转化合金阳极材料
钾离子电池（PIB）因其丰富的K储量以及与锂离子电池（LIB）类似的“摇椅式”工作原理，在电能存储系统领域具有广阔的应用前景。针对存储大尺寸钾离子的负极材料体积膨胀大、动态行为迟缓的问题，构建了还原氧化石墨烯（rGO）和氮掺杂碳（NC）分层封装的碲化铋（Bi 2 Te 3 ）纳米片作为 PIB 的阳极。所得的Bi 2 Te 3 @rGO@NC结构具有坚固的Bi─O─C化学键、紧密的物理化学限制效应、典型的导体特性和增强的K离子吸附能力，从而产生优异的电化学动力学和出色的形态和结构稳定性。通过高角度环形暗场扫描透射电子显微镜（HAADF-STEM）直观地阐明了转化合金双机制在 K 离子存储中发挥着重要作用，允许使用 Bi 作为每个分子式单元传输 12 K 离子氧化还原位点。因此，Bi 2 Te 3 @rGO@NC在50 mA g -1下具有322.70 mAh g -1的高第一可逆比容量、良好的倍率性能和循环稳定性。这项工作为深入了解钾离子储存中的转化合金化机制奠定了基础。
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