Enabling Ultrafast Single Mg2+ Insertion Kinetics of Magnesium-Ion Batteries via In Situ Dynamic Catalysis and Re-equilibration Effects,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 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.)

Enabling Ultrafast Single Mg2+ Insertion Kinetics of Magnesium-Ion Batteries via In Situ Dynamic Catalysis and Re-equilibration Effects
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-05-31 , DOI: 10.1021/acsami.3c03097
Rongrui Deng _{1,

2} , Shuangshuang Tan _{1,

2} , Zhongting Wang _{1,

2} , Rong Li _{1,

2} , Guanjie Lu ₃ , Baihua Qu _{1,

2} , Le Tong _{1,

2} , Ronghua Wang _{1,

2} , Chaohe Xu _{1,

3} , Guangsheng Huang _{1,

2} , Jingfeng Wang _{1,

2} , Aitao Tang _{1,

2} , Xiaoyuan Zhou _{1,

4} , Fusheng Pan _{1,

2}

Affiliation

Magnesium-ion batteries (MIBs) have great potential in large-scale energy storage field with high capacity, excellent safety, and low cost. However, the strong solvation effect of Mg²⁺ will lead to the formation of solvated ions in electrolytes with larger size and sluggish diffusion/reaction kinetics. Here, the concept of interfacial catalytic bond breaking is first introduced into the cathode design of MIBs by hybriding MoS₂ quantum dots with VS₄ (VS₄@MQDs) as the cathode. The “in situ dynamic catalysis and re-equilibration” effects can catalyze the Cl–Mg bond breaking and trigger single Mg²⁺ insertion/extraction chemistries, which can significantly accelerate the diffusion and reaction kinetics, as verified by the decreased diffusion energy barriers (0.26 eV for Mg²⁺ vs 2.47 eV for MgCl⁺) and fast diffusion coefficient. Benefitting from these dynamic catalysis effects, the constructed VS₄@MQD-based MIBs deliver a high discharge capacity of ∼120 mA h g^–1 at 200 mA g^–1 and a long-term cyclic stability of 1000 cycles at 1 A g^–1. The improved performance and detailed characterizations well prove that the active ions in MIBs change from MgCl⁺/Mg₂Cl³⁺ to Mg²⁺ with fast kinetics.

中文翻译：

通过原位动态催化和再平衡效应实现镁离子电池的超快单 Mg2+ 插入动力学

镁离子电池（MIBs）具有容量大、安全性好、成本低等优点，在大规模储能领域具有巨大潜力。^{然而，Mg 2+}的强溶剂化作用会导致电解质中形成尺寸较大且扩散/反应动力学缓慢的溶剂化离子。_{在这里，通过将 MoS 2}量子点与 VS ₄ (VS ₄ @MQDs)混合作为阴极，首次将界面催化键断裂的概念引入到 MIB 的阴极设计中。“原位动态催化和再平衡”效应可以催化Cl-Mg键断裂并触发单Mg ²⁺插入/提取化学物质，可显着加速扩散和反应动力学，如扩散能垒降低（Mg ^{2+为 0.26 eV vs MgCl}⁺为 2.47 eV ）和快速扩散系数所证实。受益于这些动态催化效应，构建的基于 VS ₄ @MQD 的 MIBs在 200 mA g ^{–1下具有约 120 mA hg}^{–1的高放电容量，在 1 A g}^–1下具有 1000 个循环的长期循环稳定性. 改进的性能和详细的表征很好地证明了 MIB 中的活性离子从 MgCl ⁺ /Mg ₂ Cl ³⁺变为Mg ²⁺具有快速动力学。

更新日期：2023-05-31

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