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Potassium Ammonium Vanadate with Rich Oxygen Vacancies for Fast and Highly Stable Zn-Ion Storage
ACS Nano ( IF 15.8 ) Pub Date : 2022-03-08 , DOI: 10.1021/acsnano.1c11169 Quan Zong 1 , QianQian Wang 2 , Chaofeng Liu 3 , Daiwen Tao 4 , Jiangying Wang 1 , Jingji Zhang 1 , Huiwei Du 1 , Junfu Chen 1 , Qilong Zhang 4 , Guozhong Cao 3
ACS Nano ( IF 15.8 ) Pub Date : 2022-03-08 , DOI: 10.1021/acsnano.1c11169 Quan Zong 1 , QianQian Wang 2 , Chaofeng Liu 3 , Daiwen Tao 4 , Jiangying Wang 1 , Jingji Zhang 1 , Huiwei Du 1 , Junfu Chen 1 , Qilong Zhang 4 , Guozhong Cao 3
Affiliation
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Vanadium-based materials have been extensively studied as promising cathode materials for zinc-ion batteries because of their multiple valences and adjustable ion-diffusion channels. However, the sluggish kinetics of Zn-ion intercalation and less stable layered structure remain bottlenecks that limit their further development. The present work introduces potassium ions to partially substitute ammonium ions in ammonium vanadate, leading to a subtle shrinkage of lattice distance and the increased oxygen vacancies. The resulting potassium ammonium vanadate exhibits a high discharge capacity (464 mAh g–1 at 0.1 A g–1) and excellent cycling stability (90% retention over 3000 cycles at 5 A g–1). The excellent electrochemical properties and battery performances are attributed to the rich oxygen vacancies. The introduction of K+ to partially replace NH4+ appears to alleviate the irreversible deammoniation to prevent structural collapse during ion insertion/extraction. Density functional theory calculations show that potassium ammonium vanadate has a modulated electron structure and a better zinc-ion diffusion path with a lower migration barrier.
中文翻译：
具有丰富氧空位的钒酸铵钾用于快速和高度稳定的锌离子存储
钒基材料因其多价和可调节的离子扩散通道而被广泛研究为有前途的锌离子电池正极材料。然而，锌离子嵌入的缓慢动力学和不太稳定的层状结构仍然是限制其进一步发展的瓶颈。目前的工作引入钾离子部分取代钒酸铵中的铵离子，导致晶格距离的细微收缩和氧空位增加。所得钒酸铵钾具有高放电容量（0.1 A g -1时为 464 mAh g -1 ）和出色的循环稳定性（在 5 A g -1下 3000 次循环后保持 90%）。优异的电化学性能和电池性能归功于丰富的氧空位。引入K +以部分取代NH 4 +似乎减轻了不可逆的脱氨作用，以防止离子插入/提取过程中的结构坍塌。密度泛函理论计算表明，钒酸铵钾具有调制的电子结构和更好的锌离子扩散路径和更低的迁移势垒。
更新日期：2022-03-08
中文翻译：
具有丰富氧空位的钒酸铵钾用于快速和高度稳定的锌离子存储
钒基材料因其多价和可调节的离子扩散通道而被广泛研究为有前途的锌离子电池正极材料。然而，锌离子嵌入的缓慢动力学和不太稳定的层状结构仍然是限制其进一步发展的瓶颈。目前的工作引入钾离子部分取代钒酸铵中的铵离子，导致晶格距离的细微收缩和氧空位增加。所得钒酸铵钾具有高放电容量（0.1 A g -1时为 464 mAh g -1 ）和出色的循环稳定性（在 5 A g -1下 3000 次循环后保持 90%）。优异的电化学性能和电池性能归功于丰富的氧空位。引入K +以部分取代NH 4 +似乎减轻了不可逆的脱氨作用，以防止离子插入/提取过程中的结构坍塌。密度泛函理论计算表明，钒酸铵钾具有调制的电子结构和更好的锌离子扩散路径和更低的迁移势垒。
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