One-pot coating of LiCoPO4/C by a UiO-66 metal–organic framework,RSC Advances

当前位置： X-MOL 学术 › RSC Adv. › 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.)

One-pot coating of LiCoPO4/C by a UiO-66 metal–organic framework
RSC Advances ( IF 3.9 ) Pub Date : 2020-9-23 , DOI: 10.1039/d0ra05706a
Abdelaziz M Aboraia _{1,

2} , Viktor V Shapovalov ₁ , Alexnader A Guda ₁ , Vera V Butova _{1,

3} , Alexander Soldatov ₁

Affiliation

LiCoPO₄ (LCP) is a promising high voltage cathode material but suffers from low conductivity and poor electrochemical properties. These properties can be improved by coating with a conductive carbon layer. Ongoing research is focused on the protective layer with good adhesion and inhibition of electrolyte decomposition reactions. In the present work, we suggest a new robust one-pot procedure, featuring the introduction of UiO-66 metal–organic framework (MOF) nanoparticles during LCP synthesis to create a metal–carbon layer upon annealing. The LiCoPO₄/C@UiO-66 was synthesized via the microwave-assisted solvothermal route, and 147 mA h g⁻¹ discharge capacity was obtained in the first cycle. The MOF acts as a source of both carbon and metal atoms, which improves conductivity. Using operando X-ray absorption spectroscopy upon cycling, we identify two Co-related phases in the sample and exclude the olivine structure degradation as an explanation for a long-term capacity fade.

中文翻译：

UiO-66金属-有机骨架对LiCoPO4/C的一锅包覆

LiCoPO ₄ (LCP)是一种很有前途的高压正极材料，但存在导电率低和电化学性能差的问题。这些性能可以通过涂有导电碳层来改善。正在进行的研究集中在具有良好粘附性和抑制电解质分解反应的保护层上。在目前的工作中，我们提出了一种新的稳健的一锅法，其特点是在 LCP 合成过程中引入 UiO-66 金属-有机框架 (MOF) 纳米粒子，以在退火时形成金属-碳层。LiCoPO ₄ /C@UiO-66通过微波辅助溶剂热法合成，147 mA hg ^-1在第一个循环中获得放电容量。MOF 作为碳和金属原子的来源，可提高导电性。使用循环时的操作 X 射线吸收光谱，我们确定了样品中的两个与 Co 相关的相，并排除了橄榄石结构退化作为长期容量衰减的解释。

更新日期：2020-09-23

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文本刊介绍/投稿指南11