Battery characterization via eddy-current imaging with nitrogen-vacancy centers in diamond

金刚石中氮空位中心的Eddy-current成像

Eddy-current imaging with nitrogen-vacancy centers in diamond

我们展示了微波无涡流成像使用金刚石中的氮空位中心。通过检测导电样品的涡流感应磁场，可以区分不同的材料和形状，识别结构缺陷。我们的技术允许根据其导电性区分不同的材料。对于半径$r_0$ = 1，1 mm和高度$h$ = 1，0.1 mm的圆柱形样品，测量的灵敏度计算为8 $\times 10 ^{5}$\，S/m\，$\sqrt[]{\textrm{Hz}}$（体积为$\sim$，0.3 mm $^3$），距离为0.5 mm。与现有技术相比，基于金刚石的器件表现出优异的带宽和空间分辨率。特别是，我们证明了从DC到3.5 MHz的平坦频率响应和348\，$\pm$\，2\，$μ$ m的空间分辨率。

Burst Eddy Current Testing with a Diamond Magnetometry

In this work, a burst eddy current testing technique based on the employment of a diamond nitrogen vacancy (NV) center magnetometer with the Hahn echo (HE) sequence is demonstrated. With the confocal experiment apparatus, the HE-based NV magnetometer attained a magnetic sensitivity of $4.3 ~ \mathrm{nT} / \sqrt{\mathrm{Hz}}$ and a volume-normalized sensitivity of $3.6 ~ \mathrm{pT} / \sqrt{\mathrm{Hz} \cdot \mathrm{mm}^{-3}}$, which are 5 times better than the already existing method under the same conditions. Based on the proposed magnetometer configuration, a burst eddy current (BEC) testing…

使用基于NV的脉冲场梯度NMR对微结构中的局部扩散进行成像

Imaging local diffusion in microstructures using NV-based pulsed field gradient NMR

本文提出一种将脉冲梯度自旋回波与光学检测NV-NMR波谱相结合的方法，实现了微结构内分子扩散和流动的局部定量成像，并展示了模型微结构中各向异性水扩散的探测，为单细胞和电池材料研究开辟了新前景。

A phase field electro-chemo-mechanical formulation for predicting void evolution at the Li-electrolyte interface in all-solid-state batteries

We present a mechanistic theory for predicting void evolution in the Li metal electrode during the charge and discharge of all-solid-state battery cells. A phase field formulation is developed to model vacancy annihilation and nucleation, and to enable the tracking of the void-Li metal interface. This is coupled with a viscoplastic description of Li deformation, to capture creep effects, and a mass transfer formulation accounting for substitutional (bulk and surface) Li diffusion and current-driven flux. Moreover, we incorporate the interaction between the electrode and the solid electrolyte, …