Suppr超能文献

3D 亲锂-疏锂双骨架助力高可逆性锂金属负极。

Highly Reversible Lithium Metal Anode Enabled by 3D Lithiophilic-Lithiophobic Dual-Skeletons.

机构信息

State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, P. R. China.

Res Inst Chem Def, Beijing Key Lab Adv Chem Energy Storage Technol &, Beijing, 100191, P. R. China.

出版信息

Adv Mater. 2023 Apr;35(15):e2211203. doi: 10.1002/adma.202211203. Epub 2023 Mar 6.

Abstract

Lithium metal is a promising anode for high-energy-density lithium batteries, but its practical application is still hindered by intrinsic defects such as infinite volume expansion and uncontrollable dendrite growth. Herein, a dendrite-free 3D composite Li anode (Li-B@SSM) is prepared by mechanical rolling of lithiophilic LiB nanofibers supported by Li-B composite and lithiophobic stainless-steel mesh (SSM). Featuring hierarchical lithiophilic-lithiophobic dual-skeletons, the Li-B@SSM anode shows an ultrahigh Coulombic efficiency of 99.95% and a long lifespan of 900 h under 2 mA cm /1 mAh cm . It is demonstrated that the abnormally reversible Li stripping/plating processes should be closely related to the site-selective plating behavior and spatial confinement effect induced by the robust lithiophilic-lithiophobic dual-skeletons, which alleviates the volume changes, suppresses the growth of Li dendrites, and reduces the accumulation of "dead" Li. More importantly, the application feasibility of the Li-B@SSM anode is also confirmed in full batteries, of which the Li-B@SSM|LiFePO full cell shows a high capacity retention of 97.5% after 400 cycles while the Li-B@SSM|S pouch battery exhibits good cycle stability even under practically harsh conditions. This work paves the way for the facile and efficient fabrication of high-efficiency Li metal anodes toward practical applications.

摘要

金属锂是高能密度锂电池的一种很有前途的阳极材料,但由于其内在缺陷,如无限的体积膨胀和不可控的枝晶生长,其实际应用仍受到阻碍。在此,通过机械滚压制备了无枝晶的 3D 复合 Li 阳极(Li-B@SSM),该阳极由 Li-B 复合和疏锂不锈钢网(SSM)支撑的亲锂 LiB 纳米纤维组成。具有分级亲锂-疏锂双骨架的 Li-B@SSM 阳极在 2 mA cm /1 mAh cm 下表现出超高的库仑效率 99.95%和长循环寿命 900 h。研究表明,异常可逆的 Li 剥离/电镀过程应与由坚固的亲锂-疏锂双骨架引起的选择性电镀行为和空间限制效应密切相关,这缓解了体积变化,抑制了 Li 枝晶的生长,并减少了“死”Li 的积累。更重要的是,还在全电池中验证了 Li-B@SSM 阳极的应用可行性,其中 Li-B@SSM|LiFePO 全电池在 400 次循环后具有 97.5%的高容量保持率,而 Li-B@SSM|S 软包电池即使在苛刻的实际条件下也表现出良好的循环稳定性。这项工作为高效 Li 金属阳极的简便高效制造铺平了道路,有利于其实际应用。

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍。

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索

文档翻译

学术文献翻译模型,支持多种主流文档格式。

立即体验