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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
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