Shuai Yi, Hu Yilong, Geng Lan, Lou Jin, Zhou Jingan, Zhang Limin, Li Ming, Su Changqing, Lu Jiming, Wu Yingpeng
State Key Laboratory of Chem/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Hunan Agricultural Equipment Research Institute, Hunan Academy of Agricultural Sciences, Changsha 410083, China.
ACS Appl Mater Interfaces. 2025 Jun 11;17(23):33987-33997. doi: 10.1021/acsami.5c04611. Epub 2025 May 27.
The lithium metal anode is considered a promising anode material due to its high specific capacity. However, the high reactivity and nonuniform deposition of Li metal pose significant challenges to the advancement of Li metal batteries. In this study, we introduce a straightforward and efficient approach to fabricate a heterogeneous Li/Li-Mg alloy anode with an Mg gradient distribution. Compared with homogeneous Li-Mg alloys, gradient-heterogeneous Li/Li-Mg alloys can offer a higher electrochemical activity surface area. Besides, the rich-Li alloy on the surface of alloy particles adeptly prevents the passivation effect, and the interior-rich Mg alloy guarantees the structural stability of the electrode. The symmetrical cell utilizing the gradient-heterogeneous Li/Li-Mg alloy exhibits stable cycling performance exceeding 7000 h. When paired with a SPAN cathode, the full cell retains 95% of its reversible capacity over 500 cycles. This study presents a straightforward and efficient approach to further the development of Li metal batteries.
锂金属负极因其高比容量而被认为是一种很有前景的负极材料。然而，锂金属的高反应活性和不均匀沉积对锂金属电池的发展提出了重大挑战。在本研究中，我们引入了一种简单有效的方法来制备具有镁梯度分布的异质锂/锂-镁合金负极。与均质锂-镁合金相比，梯度异质锂/锂-镁合金可提供更高的电化学活性表面积。此外，合金颗粒表面富含锂的合金巧妙地防止了钝化效应，而内部富含镁的合金保证了电极的结构稳定性。使用梯度异质锂/锂-镁合金的对称电池表现出超过7000小时的稳定循环性能。当与SPAN正极配对时，全电池在500次循环后仍保留其可逆容量的95%。本研究提出了一种简单有效的方法来推动锂金属电池的进一步发展。
