Study of Polyoxometalates as Electrode Materials for Lithium‐Ion Batteries: Thermal Stability Paves the Way to Improved Cycle Stability,ChemElectroChem

当前位置： X-MOL 学术 › ChemElectroChem › 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.)

Study of Polyoxometalates as Electrode Materials for Lithium‐Ion Batteries: Thermal Stability Paves the Way to Improved Cycle Stability
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-11-25 , DOI: 10.1002/celc.202001451
Georg‐Maximilian Bosch _{1,

2} , Angelina Sarapulova ₂ , Sonia Dsoke _{1,

2}

Affiliation

Polyoxometallates (POMs) are ideal candidates for energy storage because of their multi‐electron transfer. (n‐Bu₄N)₃PW₁₂O₄₀ (TBA‐PW) and Cs₃PW₁₂O₄₀ (Cs‐PW), prepared by proton‐exchange with tetrabutylammonium (TBA⁺) and cesium (Cs⁺) from H₃PW₁₂O₄₀, suffer from serious capacity fading, owing to the contained crystal water. The presence of water in POMs is well known, but its effect on electrochemical performance is not reported yet. In contrast to TBA‐PW, Cs‐PW has a higher thermal stability and can be treated at 600 °C, which allows the complete water removal (Cs‐PW‐600). Cs‐PW‐600 has a 15‐times better cycling performance than the one dried at 120 °C. Different pressures were applied to optimize the electrode fabrication. Samples treated at 8 tons show a three‐times better rate capability with respect to the unpressed sample, with 42.8 % retention of the capacity at 200 mA g⁻¹. Cs‐PW‐600 can be seen as an example for further investigations on POMs as electrode materials.

中文翻译：

多金属氧酸盐作为锂离子电池电极材料的研究：热稳定性为改善循环稳定性铺平了道路

多金属氧酸盐（POM）由于其多电子转移而成为能量存储的理想选择。（n-Bu ₄ N）₃ PW ₁₂ O ₄₀（TBA-PW）和Cs ₃ PW ₁₂ O ₄₀（Cs-PW），由四丁基铵（TBA ⁺）和铯（Cs ⁺）由H ₃进行质子交换制得PW ₁₂ O ₄₀，由于所含的结晶水而遭受严重的容量衰减。POM中存在水是众所周知的，但尚未报道其对电化学性能的影响。与TBA-PW相比，Cs-PW具有更高的热稳定性，可以在600°C的温度下进行处理，从而可以完全除水（Cs-PW-600）。Cs-PW-600的循环性能比在120°C下干燥的循环性能好15倍。施加不同的压力以优化电极制造。以8吨处理的样品相对于未压制样品显示出了三倍的倍率能力，在200 mA g ^-1下保持了42.8％的能力。Cs-PW-600可以作为进一步研究作为电极材料的POM的示例。

更新日期：2020-11-25

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