Antipulverization Electrode Based on Low-Carbon Triple-Shelled Superstructures for Lithium-Ion Batteries.
The realization of antipulverization electrode structures, especially using low-carbon-content anode materials, is crucial for developing high-energy and long-life lithium-ion batteries (LIBs); however, this technology remains challenging. This study shows that SnO2 triple-shelled hollow superstructures (TSHSs) with a low carbon content (4.83%) constructed by layer-by-layer assembly of various nanostructure units can withstand a huge volume expansion of ≈231.8% and deliver a high reversible capacity of 1099 mAh g-1 even after 1450 cycles. These values represent the best comprehensive performance in SnO2 -based anodes to date. Mechanics simulations and in situ transmission electron microscopy suggest that the TSHSs enable a self-synergistic structure-preservation behavior upon lithiation/delithiation, protecting the superstructures from collapse and guaranteeing the electrode structural integrity during long-term cycling. Specifically, the outer shells during lithiation processes are fully lithiated, preventing the overlithiation and the collapse of the inner shells; in turn, in delithiation processes, the underlithiated inner shells work as robust cores to support the huge volume contraction of the outer shells; meanwhile, the middle shells with abundant pores offer sufficient space to accommodate the volume change from the outer shell during both lithiation and delithiation. This study opens a new avenue in the development of high-performance LIBs for practical energy applications.
['Zu|Lianhai|L|http://orcid.org/0000-0001-5685-3721', 'Su|Qingmei|Q|http://orcid.org/0000-0002-6662-7557', 'Zhu|Feng|F|', 'Chen|Bingjie|B|', 'Lu|Huanhuan|H|', 'Peng|Chengxin|C|', 'He|Ting|T|', 'Du|Gaohui|G|', 'He|Pengfei|P|', 'Chen|Kai|K|', 'Yang|Shihe|S|http://orcid.org/0000-0002-6469-8415', 'Yang|Jinhu|J|http://orcid.org/0000-0002-0651-1894', 'Peng|Huisheng|H|']
antipulverization lithium-ion batteries SnO2 carbon triple-shelled structure