Details

Autor(en) / Beteiligte

• Wei, Chaohui
• Ruan, Jin
• Song, Zhicui
• Chen, Xiaoxiao
• Wang, Donghuan
• Jiang, Jicheng
• Wang, Xin
• Zhou, Aijun
• Zou, Wei
• Li, Jingze

Titel

Synergistic surface and bulk engineering with Li-rich dual-phase Li-Al alloy anode for rational regulation of lithium deposition

Ist Teil von

• Journal of alloys and compounds, 2023-10, Vol.960, p.170643, Article 170643

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• Lithium (Li) metal has been regarded as one of the most promising anodes for the next-generation high-energy-density batteries. However, the large volumetric variation and uncontrollable Li dendrite growth have delayed the large-scale application. For the sake of ultrahigh theoretical capacity, low alloying potential, and small dimensional expansion, Li-Al alloy has come into sight as an appealing candidate for Li anode. Herein, as-prepared Li-rich dual-phase Li-Al alloys with abundant Li and Li9Al4 three-dimensional (3D) framework are fabricated via a one-step melting approach. Different from typical facial modification of Li anode, our Li-Al alloy can improve the electrochemical behavior of anode, fundamentally from surface and matrix prospect. Owing to the favorable lithiophilicity, increased specific surface, and regulated Li ion (Li+) flux, Li-Al symmetric cell presents excellent cyclic reversibility and stability (more than 1400 h, and smaller voltage hysteresis of 76 mV at 300th cycle), at the current density of 1 mA cm2 and areal capacity of 1 mAh cm2. Furthermore, Li-Al alloy anode is paired with LiFePO4 cathode to assemble full battery, which enables 250 cycles at 1.0 C with a high-capacity retention rate of 94.7 %. This contribution offers new insights into the feasible preparation of Li-Al alloy composite and in-depth understanding of working mechanism toward dendrite-free and minimum-volume-change Li anode. [Display omitted] •Designing a conductive, affinitive and stable framework for Li anode protection from the surface and bulk perspective.•Inducing uniform deposition and minimum dimensional change to enable dendrite-free Li anode.•Realizing impressive mass capacity and cyclic stability in full-cells.