Surface modification of TiO2 coating over single crystalline NMC-83 cathode for lithium-ion batteries

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-04-28 DOI:10.1016/j.jpcs.2025.112825

B. Jeevanantham, K.P. Abhinav, M.K. Shobana

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Abstract

Nickel-rich NMC cathodes have garnered significant attention as a widely used class of cathodes for lithium-ion batteries. However, oxygen loss at high voltages, structural instabilities during electrochemical cycling, and poor rate capability hinder their use in commercial applications. Titanium oxide (TiO₂) coating contributes to a high level of lithium storage and improves their long cyclability. A cost-effective wet chemical technique deposits a thin TiO₂ coating over the LiNi_0.83Mn_0.06Co_0.11O₂ (NMC-83) cathode. XRD and FESEM conclude that the NMC-83 particles are unaffected by the thin-layer coating. XPS analysis confirms the presence of coating; it affirms that the irreversible transition between H2 and H3 is strongly mitigated by coating. This results in good cyclic performance at higher cut-off voltages. The NMC-TiO cathode retains 88 % discharge capacity, while the pristine cathode shows only 85.5 % after 70 cycles at a 1C rate. This nano-coating has important implications for high-performance rechargeable batteries used in electric vehicles.

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锂离子电池单晶NMC-83阴极上TiO2涂层的表面改性

富镍NMC阴极作为一种广泛应用于锂离子电池的阴极，引起了人们的广泛关注。然而，高压下的氧损失、电化学循环过程中的结构不稳定以及较差的速率能力阻碍了它们在商业应用中的应用。氧化钛（TiO2）涂层有助于高水平的锂存储并提高其长循环性。一种具有成本效益的湿化学技术在LiNi0.83Mn0.06Co0.11O2 （NMC-83）阴极上沉积了一层薄薄的TiO2涂层。XRD和FESEM分析表明，NMC-83颗粒不受薄层涂层的影响。XPS分析证实涂层的存在；这证实了涂层可以有效地减缓H2和H3之间的不可逆转变。这导致在较高的截止电压下具有良好的循环性能。NMC-TiO阴极保持88%的放电容量，而原始阴极在1C倍率下循环70次后仅显示85.5%的放电容量。这种纳米涂层对电动汽车高性能可充电电池具有重要意义。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.