Improving Contact Impedance via Electrochemical Pulses Applied to Lithium–Solid Electrolyte Interface in Solid-State Batteries,ACS Energy Letters

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Improving Contact Impedance via Electrochemical Pulses Applied to Lithium–Solid Electrolyte Interface in Solid-State Batteries
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-09-23 , DOI: 10.1021/acsenergylett.1c01573
Anand Parejiya _{1,

2} , Ruhul Amin ₁ , Marm B. Dixit ₁ , Rachid Essehli ₁ , Charl J. Jafta ₁ , David L. Wood ₂ , Ilias Belharouak _{1,

2}

Affiliation

Stabilizing interfaces in solid-state batteries (SSBs) is crucial for development of high energy density batteries. In this work, we report a facile electrochemical protocol to improve the interfacial impedance and contact at the interface of Li | Li_6.25Al_0.25La₃Zr₂O₁₂ (LALZO). Application of short duration, high-voltage pulses to poorly formed interfaces leads to lower contact impedance. It is found that the local high current density that results from these pulses at the vicinity of the interfacial pores can lead to a better contact between Li and LALZO because of local Joule heating, as supported by theoretical simulations. The pulse technique, which has also been applied to a Li | Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO) | LiNi_0.6Mn_0.2Co_0.2O₂ (NMC622) cell, results in remarkable reduction of the charge-transfer resistance. Ex situ characterizations, which include X-ray photoelectron spectroscopy and scanning electron microscopy techniques, reveal that there is no detrimental effects of the pulse on cathode and solid electrolyte bulks and interfaces. This electrochemical pulse technique sheds light on a facile, nondestructive method that has the potential to significantly improve the interfacial contacts in a solid-state battery configuration.

中文翻译：

通过应用于固态电池中锂-固体电解质界面的电化学脉冲改善接触阻抗

稳定固态电池 (SSB) 中的界面对于开发高能量密度电池至关重要。在这项工作中，我们报告了一种简便的电化学方案，以改善 Li | 界面处的界面阻抗和接触。Li _6.25 Al _0.25 La ₃ Zr ₂ O ₁₂ (LALZO)。将持续时间短的高压脉冲应用到形成不良的界面会导致较低的接触阻抗。研究发现，由于局部焦耳加热，在界面孔附近由这些脉冲产生的局部高电流密度可以导致 Li 和 LALZO 之间更好的接触，这得到了理论模拟的支持。脉冲技术，也已应用于 Li | 李_6.4La ₃ Zr _1.4 Ta _0.6 O ₁₂ (LLZTO) | LiNi _0.6 Mn _0.2 Co _0.2 O ₂ (NMC622) 电池导致电荷转移电阻显着降低。包括 X 射线光电子能谱和扫描电子显微镜技术在内的非原位表征表明，脉冲对阴极和固体电解质块体和界面没有不利影响。这种电化学脉冲技术揭示了一种简便、无损的方法，该方法有可能显着改善固态电池配置中的界面接触。

更新日期：2021-10-08

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