Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China.
State Key Laboratory of Chemical Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, PR China.
ACS Appl Mater Interfaces. 2023 May 31;15(21):25506-25515. doi: 10.1021/acsami.3c02681. Epub 2023 May 19.
Although transition metal-based anodes for batteries are preferred owing to their higher energy density, the potential for structural collapse due to volume expansion has hindered their development. Herein, a simulated cellular structured anode composed of uniform nanoparticles and wrapped polydopamine is designed to direct the electronic/ionic diffusion channel and effectively address the volume expansion problem. The controlled-release effects of the polymer between the nano-interface protect the three-dimensional (3D) structures from collapsing during the electrochemical process. The constructed conductive networks along the NiO nanoparticle configurations effectively induce the transfer path and further accelerate the diffusion rate. Furthermore, interstitial filling unlocks the inactive component and triggers the deep delivery of electrons, which boosts battery performance. Therefore, the 3D structured PDA@NiO@G anode prepared from a recycled graphite conductive substrate exhibits excellent specific capacity (500 mAh g at 0.1 A g) and significantly improved long-cycle performance (402 mAh g after 500 cycles at 0.5 A g). The structure modulation strategy provides meaningful insight into transition metal anodes for the fabrication of high kinetics and prolonged life lithium-ion batteries, as well as the reuse of the spent graphite anode.
虽然基于过渡金属的电池阳极由于其更高的能量密度而受到青睐，但由于体积膨胀而导致结构坍塌的潜力阻碍了它们的发展。在此，设计了一种由均匀纳米颗粒和包裹的聚多巴胺组成的模拟细胞结构阳极，以引导电子/离子扩散通道并有效解决体积膨胀问题。聚合物在纳米界面之间的控制释放效应保护三维（3D）结构在电化学过程中不会坍塌。沿着 NiO 纳米颗粒结构构建的导电网络可以有效地诱导传输路径，并进一步加速扩散速率。此外，间隙填充释放了非活性成分并触发了电子的深度传递，从而提高了电池性能。因此，由回收石墨导电基底制备的 3D 结构 PDA@NiO@G 阳极表现出优异的比容量（在 0.1 A g 下为 500 mAh g）和显著改善的长循环性能（在 0.5 A g 下 500 次循环后为 402 mAh g）。该结构调制策略为制备具有高动力学和长寿命锂离子电池的过渡金属阳极以及废石墨阳极的再利用提供了有意义的见解。
