<br>通过智能内置 LiC6 相实现阳极中的快速质量传输，用于高性能固态锂金属电池,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 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.)

通过智能内置 LiC6 相实现阳极中的快速质量传输，用于高性能固态锂金属电池
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-07-05 , DOI: 10.1002/adfm.202408447
Xianbiao Li ₁ , Peixiang Ning ₁ , Ping Liu ₂ , Yingying Chen ₁ , Juntao Liu ₁ , Wei Liu ₁ , Jinshi Wang ₁ , Hao Huang ₁ , Bowen Yang ₁ , Xinhui Xia ₃ , Serguei V. Savilov ₄ , Sergey M. Aldoshin ₅ , Qiuying Xia ₁ , Jing Xu ₁ , Hui Xia ₁

Affiliation

固态锂金属电池的实际应用受到锂枝晶通过固体电解质的快速生长的阻碍，导致寿命短，高倍率时性能不佳。阳极块中的质量传递被认为是与界面化学机械故障和锂枝晶生长有关的关键原因。在这项研究中，利用熔融锂和热膨胀石墨之间的热力学反应开发了一种具有巧妙集成的 LiC₆ 相的锂复合阳极。重力偏析效应在 Li 中产生 LiC₆ 的梯度分散，从而改善了本体 Li 扩散动力学（比纯 Li 负极高 70 倍）。这种复合电极在室温下在全固态对称电池中表现出低界面电阻（≈2.3 Ω cm²）和 2.4 mA ^cm-2 的超高临界电流密度。在重复的锂剥离/电镀循环中，增强的体锂扩散动力学保持紧密的界面接触，从而在超过 4000 小时内具有出色的长期循环稳定性，并具有高累积面容量。这些发现提供了有价值的见解，即促进锂金属负极的质量传输对高性能固态锂金属电池有很大的好处。

"点击查看英文标题和摘要"

Enabling Fast Mass Transport in Anode by a Smartly Built-in LiC6 Phase for High-Performance Solid-State Lithium Metal Batteries

The practical use of solid-state lithium metal batteries is hindered by the rapid growth of lithium dendrites through the solid electrolyte, leading to a short lifespan, and poor performance at high rates. The mass transport in anode bulk is proposed as a critical reason related to the chemo-mechanical failure of the interface and growth of lithium dendrites. In this study, a lithium-composite anode with a smartly integrated LiC₆ phase is developed using a thermodynamic reaction between molten Li and thermally expanded graphite. The gravity segregation effect creates a gradient dispersion of LiC₆ in Li, resulting in improved bulk Li diffusion kinetics (70 times higher than that of a pure Li anode). This composite electrode exhibits low interfacial resistance (≈2.3 Ω cm²) and an ultra-high critical current density of 2.4 mA cm⁻² in all-solid-state symmetric cells at room temperature. During repeated Li stripping/plating cycles, the enhanced bulk Li diffusion kinetics maintain the close interfacial contact, leading to excellent long-term cycling stability for over 4000 h with a high cumulative areal capacity. These findings provide valuable insights that promoted mass transport in lithium metal anode is of great benefit to high-performance solid-state lithium metal batteries.

更新日期：2024-07-05

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南