斜方晶系铌酸镍 (NiNb2O6) 的机械化学合成作为锂离子电池坚固且快速充电的负极材料,ACS Applied Energy Materials

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

斜方晶系铌酸镍 (NiNb2O6) 的机械化学合成作为锂离子电池坚固且快速充电的负极材料
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-06-14 , DOI: 10.1021/acsaem.2c00935
Yannis De Luna ₁ , Nasr Bensalah ₁

Affiliation

对能够提供高能量和快速充电率而又不影响安全性的一代锂离子电池的需求量很大。尽管进行了广泛的研究工作，但目前的锂离子技术仍无法满足大规模电化学储能应用的要求。最近，铌基氧化物因其快速充电能力、中等高容量、长循环寿命和高工作电压而受到特别关注，可防止锂电镀和枝晶形成。然而，铌酸盐化合物的合成通常涉及超过 1100 °C 的高温或复杂的化学合成。在这项工作中，一种铌酸镍化合物（NiNb ₂ O ₆) 已通过基于镍和铌前体之间的固态反应的简便且可扩展的方法合成。在 900 °C 热处理之前，通过机械技术辅助合成以提高反应速率并推动反应完成。X 射线衍射的结果证实了纯斜方晶 NiNb ₂ O ₆的形成。^{所制备的负极材料与 Li/Li +}相比组装在半电池中，并以 0.1 A g ^–1 (0.42 C)的速率提供约 240 mAh g ^–1的最大比充电容量，库仑效率为 100% . 正交 NiNb ₂ O ₆表现出稳定的循环性能 (145 mAh g ^–10.8 A g ^–1 (3.4 C))、高容量保持率（在 3.4 C 下 1000 次循环后达到 90%）和稳健的倍率性能。电化学测试和验尸分析结果证实了嵌锂过程中具有高可逆性和赝电容行为的插层机制。

"点击查看英文标题和摘要"

Mechanochemical Synthesis of Orthorhombic Nickel Niobate (NiNb2O6) as a Robust and Fast Charging Anode Material for Lithium-Ion Batteries

A generation of lithium-ion batteries that can deliver high energy and fast charging rates without compromising safety is in high demand. Despite extensive research efforts, the current Li-ion technology cannot match the requirements for large-scale electrochemical energy storage applications. Niobium-based oxides have been of particular interest lately due to their fast charging capabilities, moderately high capacity, long cycle life, and high working voltage, which prevents lithium plating and dendrite formation. However, the synthesis of niobate compounds typically involves high temperatures exceeding 1100 °C or complex chemical synthesis. In this work, a nickel niobate compound (NiNb₂O₆) has been synthesized through a facile and scalable method based on solid-state reaction between nickel and niobium precursors. The synthesis was assisted by mechanical techniques to enhance the reaction rate and drive the reaction to completion prior to a heat treatment at 900 °C. Findings from X-ray diffraction confirmed the formation of pure orthorhombic NiNb₂O₆. The as-prepared anode material was assembled in a half-cell vs Li/Li⁺ and delivered a maximum specific charge capacity of about 240 mAh g^–1 at a rate of 0.1 A g^–1 (0.42 C) with 100% Coulombic efficiency. Orthorhombic NiNb₂O₆ exhibited a stable cyclability (145 mAh g^–1 for 0.8 A g^–1 (3.4 C)), high capacity retention (90% after 1000 cycles at 3.4 C), and robust rate performance. Electrochemical tests and post-mortem analysis results confirm an intercalation-type mechanism during lithiation with high reversibility and pseudocapacitive behavior.

更新日期：2022-06-14

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南