Negative Muon Spin Rotation and Relaxation Study on Battery Anode Material, Spinel Li4Ti5O12,The Journal of Physical Chemistry C

当前位置： X-MOL 学术 › J. Phys. Chem. C › 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.)

Negative Muon Spin Rotation and Relaxation Study on Battery Anode Material, Spinel Li4Ti5O12
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.jpcc.2c02055
Izumi Umegaki ₁ , Kazuki Ohishi ₂ , Takehito Nakano ₃ , Shoichiro Nishimura ₁ , Soshi Takeshita ₁ , Akihiro Koda ₁ , Kazuhiko Ninomiya ₄ , M. Kenya Kubo ₅ , Jun Sugiyama _{2,

6}

Affiliation

To study an intrinsic self-diffusion coefficient of Li⁺ (D_Li^J) in a battery anode material, spinel Li₄Ti₅O₁₂, negative and positive muon spin rotation and relaxation (μ^±SR) spectra were measured using a powder sample in a temperature range of 100–400 K. The implanted μ⁺ in this study locates at an interstitial site near the O^2– ion to form an O–H like bond, whereas the implanted μ^– is mainly captured by an oxygen nucleus, resulting in muonic oxygen formation. The μ⁺ at an interstitial site is known to diffuse at high temperatures. Nevertheless, the muonic oxygen is immobile until the spinel decomposition temperature. The field fluctuation rate determined with μ^–SR (ν^–) increased with increasing temperature above 200 K with a 0.08(5) eV thermal activation energy. The ν^–(T) curve agreed well with the ν⁺(T) curve obtained with μ⁺SR. Thus, the origin of a fluctuation in the internal nuclear magnetic field was unambiguously confirmed as Li⁺ diffusion, i.e., the possibility of μ⁺ diffusion is clearly excluded. From the obtained ν^±, D_Li^J was estimated to be 8(2) × 10^–12 cm²/s at 300 K with E_a = 0.08 eV, under the assumption that the Li⁺ ions at the regular tetrahedral site jump to the vacant octahedral site with a random walk process.

中文翻译：

电池负极材料尖晶石Li4Ti5O12的负介子自旋和弛豫研究

^{为了研究电池负极材料中 Li +} ( D _Li^J )的固有自扩散系数，使用粉末样品测量了尖晶石 Li ₄ Ti ₅ O ₁₂、负和正 μ 子自旋旋转和弛豫 (μ ^± SR) 光谱在100-400 K的温度范围内。本研究中注入的μ ⁺位于O ^2-离子附近的间隙位置形成O-H状键，而注入的μ ^-主要被氧核捕获，导致介子氧的形成。μ ⁺已知在间隙位点处会在高温下扩散。然而，介子氧在尖晶石分解温度之前是固定的。^{用 μ -} SR (ν ^- )确定的场波动率随着温度升高到 200 K 以上而增加，热活化能为 0.08(5) eV。ν ^- ( T ) 曲线与使用 μ ⁺ SR获得的 ν ⁺ ( T ) 曲线非常吻合。因此，明确地确认了内部核磁场波动的起源是Li ⁺扩散，即明确排除了μ ^{+扩散的可能性。}从获得的 ν ^± , D_Li^J在 300 K 时估计为 8(2) × 10 ^–12 cm ^{2 /s，}E _a = 0.08 eV，假设常规四面体位点的 Li ⁺离子随机跳到空置八面体位点行走过程。

更新日期：2022-06-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11