Ko Yongmin, Kwon Cheong Hoon, Lee Seung Woo, Cho Jinhan
Department of Chemical & Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea.
Division of Energy Technology, Materials Research Institute, Daegu Gyeongbuk Institute of Science and Technology (DGIST), 333 Techno Jungang-daero, Hyeonpung-eup, Dalseong-gun, Daegu, 42988, Republic of Korea.
Adv Mater. 2020 Dec;32(51):e2001924. doi: 10.1002/adma.202001924. Epub 2020 Sep 21.
Organic-ligand-based solution processes of metal and transition metal oxide (TMO) nanoparticles (NPs) have been widely studied for the preparation of electrode materials with desired electrical and electrochemical properties for various energy devices. However, the ligands adsorbed on NPs have a significant effect on the intrinsic properties of materials, thus influencing the performance of bulk electrodes assembled by NPs for energy devices. To resolve these critical drawbacks, numerous approaches have focused on developing unique surface chemistry that can exchange bulky ligands with small ligands or remove bulky ligands from NPs after NP deposition. In particular, recent studies have reported that the ligand-exchange-induced layer-by-layer (LE-LbL) assembly of NPs enables controlled assembly of NPs with the desired interparticle distance, and interfaces, dramatically improving the electrical/electrochemical performance of electrodes. This emerging approach also demonstrates that efficient surface ligand engineering can exploit the unique electrochemical properties of individual NPs and maximize the electrochemical performance of the resultant NP-assembled electrodes through improved charge transfer efficiency. This report focuses on how LE-LbL assembly can be effectively applied to NP-based energy storage/conversion electrodes. First, the basic principles of the LE-LbL approach are introduced and then recent progress on NP-based energy electrodes prepared via the LE-LbL approach is reviewed.
基于有机配体的金属和过渡金属氧化物（TMO）纳米颗粒（NP）的溶液法已被广泛研究，用于制备具有所需电学和电化学性质的电极材料，以用于各种能量装置。然而，吸附在NP上的配体对材料的固有性质有显著影响，从而影响由NP组装而成的用于能量装置的块状电极的性能。为了解决这些关键缺点，许多方法都集中在开发独特的表面化学，这种表面化学可以用小配体交换大体积配体，或者在NP沉积后从NP上去除大体积配体。特别是，最近的研究报道，NP的配体交换诱导逐层（LE-LbL）组装能够以所需的颗粒间距离和界面进行NP的可控组装，从而显著提高电极的电学/电化学性能。这种新兴方法还表明，有效的表面配体工程可以利用单个NP的独特电化学性质，并通过提高电荷转移效率最大化所得NP组装电极的电化学性能。本报告重点关注LE-LbL组装如何有效地应用于基于NP的能量存储/转换电极。首先，介绍了LE-LbL方法的基本原理，然后综述了通过LE-LbL方法制备基于NP的能量电极的最新进展。
