Construction of a bimetallic nickel–cobalt selenide pompon used as a superior anode material for high performance sodium storage,Inorganic Chemistry Frontiers

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Construction of a bimetallic nickel–cobalt selenide pompon used as a superior anode material for high performance sodium storage
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2019/12/23 , DOI: 10.1039/c9qi01435g
Wei Zhong _{1,

2,

3,

4,

5} , Qianru Ma _{1,

2,

3,

4,

5} , Wenwen Tang _{1,

2,

3,

4,

5} , Yuanke Wu _{1,

2,

3,

4,

5} , Wei Gao _{1,

2,

3,

4,

5} , Qiuju Yang _{1,

2,

3,

4,

5} , Jingang Yang _{1,

2,

3,

4,

5} , Maowen Xu _{1,

2,

3,

4,

5}

Affiliation

Sodium-ion batteries are considered to be one of the most ideal alternatives to lithium-ion batteries as the next generation of advanced batteries due to their wide resource and low-cost advantages. However, it is urgent to find a suitable anode material to fill the gap since the commercial graphite anode cannot be applied to sodium-ion batteries. Bimetallic selenides stand out among multitudinous anode materials on account of their synergistic effects and rich electronic reaction processes. Here, a nickel–cobalt selenide pompon has been successfully prepared via a simple solvothermal method. Pompon-like NiCo₂Se₄ not only promotes the penetration of the electrolyte but also increases the electron and ion diffusion channels. In addition, this design can effectively alleviate the volume expansion of the material during charging and discharging. More importantly, the synergistic effect of Ni and Co bimetals can greatly enrich the electronic reaction process and improve the conductivity to obtain sufficient sodium-ion storage. When using this material as an anode of sodium-ion batteries, these unique advantages together facilitate NiCo₂Se₄ to deliver an impressive reversible capacity of 230 mA h g⁻¹ at 5 A g⁻¹ and excellent cycling performance up to 2500 cycles with a capacity decay rate of only 0.019%.

中文翻译：

双金属镍钴硒化物绒球的构造，可作为高性能钠存储的优质阳极材料

钠离子电池由于其广泛的资源和低成本优势，被认为是下一代高级电池锂离子电池的最理想替代品之一。然而，由于商业石墨阳极不能应用于钠离子电池，因此迫切需要找到合适的阳极材料来填充间隙。双金属硒化物因其协同作用和丰富的电子反应过程而在众多阳极材料中脱颖而出。在这里，已经通过简单的溶剂热法成功制备了镍钴硒化物绒球。绒球状NiCo ₂ Se ₄不仅促进电解质的渗透，而且增加了电子和离子的扩散通道。另外，这种设计可以有效地减轻充放电期间材料的体积膨胀。更重要的是，Ni和Co双金属的协同作用可以极大地丰富电子反应过程并提高电导率以获得足够的钠离子存储量。当使用这种材料作为钠离子电池的阳极时，这些独特的优势共同促进了NiCo ₂ Se ₄在5 A g ^-1下可提供令人印象深刻的230 mA hg ^-1的可逆容量，以及高达2500次循环的出色循环性能。容量衰减率仅为0.019％。

更新日期：2020-02-18

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