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在添加的丰富的基阴极的内层/间层空间变化,用于网格氧气固定

Liuyang Zhao¹, Zian Huang¹, Shenao Ma¹

¹Key Laboratory of Energy Materials and Devices (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024 Liaoning Province, China.

Journal of colloid and interface science

|March 8, 2025

概括

兴奋剂通过加强氧键来稳定丰富的基氧化物 (LRMO) 中的氧气. 这提高了网格稳定性和离子传输,这对于高能电池应用至关重要.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
固态化学固态化学

背景情况:

富的基氧化物 (LRMO) 由于氧氧还原作用,提供了高容量.
循环时格子氧气不稳定性限制了LRMO的实际应用.
稳定晶格氧是高能量密度正极材料的关键.

研究的目的:

调查 (Si) 兴奋剂作为一种提高LRMO格子氧气稳定的策略.
阐明Si兴奋剂改善LRMO结构完整性和电化学性能的机制.

主要方法:

合成和表征添加的Li_1.2Mn_0.53Co_0.13Ni_0.13Si_0.01O₂阴极材料.
电化学测试以评估循环稳定性和离子传输.
理论计算 (例如,DFT) 来分析Si对氧空位形成和格子结构的影响.

主要成果:

兴奋剂通过强大的Si-O共价键和减少过渡金属板相互作用,有效地稳定了晶格氧.
兴奋剂通过诱导层间膨胀和层内减少来促进离子运输.
理论计算证实,Si的替代增加了氧空位形成能量,最大限度地减少了高电压 (≥4.8V) 的氧气损失.

结论:

兴奋剂是一种非常有效的策略,用于稳定LRMO阴极材料中的晶格氧.
该研究强调了具有小离子半径的氧亲和元素对于调节内层/间层动态的重要性.
这项工作为设计先进电池的稳定,高能量密度阴极材料提供了关键的见解.

关键词:

固定格子中的氧气.内部层/中间层的空间变化.富含的基于的氧化物.的替代物的替代物

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