通过调整表面重构途径实现富锂富锰阴极容量衰减与电压衰减的去耦合

IF 32.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Energy & Environmental Science Pub Date : 2024-11-12 DOI:10.1039/d4ee02329c
Gukhyun Lim, Min Kyung Cho, Jaewon Choi, Ke-Jin Zhou, Dongki Shin, Seungyun Jeon, Minhyung Kwon, A-Re Jeon, Jinkwan Choi, Seok Su Sohn, Minah Lee, Jihyun Hong
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引用次数: 0

摘要

在锂离子电池(LIB)的阴极材料中,利用富含锂/锰的层状氧化物(LMR-NMCs)中的氧阴离子氧化还原可提供最高的容量。然而,由于涉及阳离子失调和氧释放的不可逆相变会导致电压和容量持续衰减,因此长期使用这种材料具有挑战性。虽然大量的研究已经揭示了阳离子无序化的热力学起源,但氧气流失和随之而来的晶格致密化的机制仍然难以捉摸。此外,循环后形成的尖晶石-岩盐混合纳米域使降解机制变得更加复杂。在此,我们通过电解质改性的对比研究,揭示了 LMR-NMC 中相变途径与颗粒表面氧稳定性之间的密切联系。通过定制表面重构途径,我们控制了整体的相变和电化学演化机制。从电解质中去除极性碳酸乙烯酯可显著抑制阴极-电解质界面的不可逆氧损耗,优先促进原位层状-尖晶石相转变,同时避免典型的岩盐相形成。电子显微镜、X 射线吸收光谱和共振非弹性 X 射线散射显示,原位形成的尖晶石稳定表面通过三维离子通道增强了电荷转移动力学,在 700 次循环中保持了镍、锰和氧的可逆氧化还原能力。表面尖晶石相的深度脱铁和锂化加速了块状层状到尖晶石相的转变,从而导致热力学电压衰减而不损失容量。相反,传统电解质会引起层状到岩盐的表面重构,阻碍电荷转移反应,从而导致容量和(表面)电压同时衰减。我们的研究将 LMR-NMC 中电压衰减的热力学和动力学方面解耦,建立了表面重构、体相转变和利用阳离子和阴离子氧化还原偶合的高容量阴极电化学之间的相关性。这项研究强调了电化学界面稳定化对未来 LIB 中富锰阴极化学的重要意义。
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Decoupling Capacity Fade and Voltage Decay of Li-rich Mn-rich Cathodes by Tailoring Surface Reconstruction Pathways
Exploiting oxygen anion redox in Li-/Mn-rich layered oxides (LMR-NMCs) offers the highest capacity among cathode materials for Li-ion batteries (LIBs). However, its long-term utilization is challenging due to continuous voltage and capacity decay caused by irreversible phase transitions involving cation disordering and oxygen release. While extensive studies have revealed the thermodynamic origin of cation disordering, the mechanisms of oxygen loss and consequent lattice densification remain elusive. Moreover, mixed spinel-rocksalt nanodomains formed after cycling complicate the degradation mechanism. Herein, we reveal a strong correlation between phase transition pathways and oxygen stability at the particle surface in LMR-NMCs through a comparative study using electrolyte modification. By tailoring surface reconstruction pathways, we control overall phase and electrochemistry evolution mechanisms. Removing polar ethylene carbonate from the electrolyte significantly suppresses irreversible oxygen loss at the cathode-electrolyte interface, preferentially promoting the in-situ layered-to-spinel phase transition while avoiding typical rocksalt phase formation. The in-situ formed spinel-stabilized surface enhances charge transfer kinetics through three-dimensional ion channels, maintaining reversible Ni, Mn, and O redox capability over 700 cycles, as revealed by electron microscopy, X-ray absorption spectroscopy, and resonant inelastic X-ray scattering. Deep delithiation and lithiation enabled by the surface spinel phase accelerate the bulk layered-to-spinel phase transition, inducing thermodynamic voltage fade without capacity loss. Conversely, conventional electrolytes induce layered-to-rocksalt surface reconstruction, impeding charge transfer reactions, which causes simultaneous capacity and (apparent) voltage fades. Our work decouples thermodynamic and kinetic aspects of voltage decay in LMR-NMCs, establishing the correlation between surface reconstruction, bulk phase transition, and the electrochemistry of high-capacity cathodes that exploit cation and anion redox couples. This study highlights the significance of electrochemical interface stabilization for advancing Mn-rich cathode chemistries in future LIBs.
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来源期刊
Energy & Environmental Science
Energy & Environmental Science 化学-工程:化工
CiteScore
50.50
自引率
2.20%
发文量
349
审稿时长
2.2 months
期刊介绍: Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).
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