Mao Heng, Yu Wei, Cai Zhuanyun, Liu Guixian, Liu Limin, Wen Rui, Su Yaqiong, Kou Huari, Xi Kai, Li Benqiang, Zhao Hongyang, Da Xinyu, Wu Hu, Yan Wei, Ding Shujiang
Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, School of Chemistry, Xi'an Jiaotong University & Shaanxi Quantong Joint Research Institute of New Energy Vehicles Power, Xi'an Jiaotong University, Xi'an, 710049, China.
Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.
Angew Chem Int Ed Engl. 2021 Aug 23;60(35):19306-19313. doi: 10.1002/anie.202105831. Epub 2021 Jul 19.
Uncontrolled dendrite formation in the high energy density of lithium (Li) metal batteries (LMBs) may pose serious safety risks. While numerous studies have attempted to protect separators, these proposed methods fail to effectively inhibit upward dendrite growth that punctures through the separator. Here, we introduce a novel "orientated-growth" strategy that transfers the main depositional interface to the anode/current collector interface from the anode/separator interface. We placed a layer of cellulose/graphene carbon composite aerogel (CCA) between the current collector and the anode (LCL-bottom). This layer works as a charge organizer that induces a high current density and encourages Li to deposit at the anode/current collector interface. Both in situ and ex situ images of the electrode demonstrate that the anode part of the cell has been flipped; with the newly deposited particles facing the current collector and the smooth surface facing the separator. The electrode in half and full cells showed outstanding cyclic stability and rate capability, with the LCL-bottom/LFP full cell capable of maintaining 94 % of its initial capacity after 1000 cycles.
锂金属电池（LMBs）高能量密度下不受控制的枝晶形成可能带来严重的安全风险。尽管众多研究试图保护隔膜，但这些提出的方法未能有效抑制穿透隔膜向上生长的枝晶。在此，我们引入一种新颖的“定向生长”策略，将主要沉积界面从阳极/隔膜界面转移至阳极/集流体界面。我们在集流体与阳极之间放置了一层纤维素/石墨烯碳复合气凝胶（CCA）（LCL-底部）。这一层起到电荷组织者的作用，诱导高电流密度并促使锂在阳极/集流体界面沉积。电极的原位和非原位图像均表明电池的阳极部分已翻转；新沉积的颗粒面向集流体，光滑表面面向隔膜。半电池和全电池中的电极均表现出出色的循环稳定性和倍率性能，LCL-底部/LFP全电池在1000次循环后能够保持其初始容量的94%。
