Three-dimensional porous aerogel assembly from ultrathin rGO@SnO2 nanosheets for advanced lithium-ion batteries
Three-dimensional porous aerogel assembly from ultrathin rGO@SnO2 nanosheets for advanced lithium-ion batteries
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用于先进锂离子电池的超薄 rGO@SnO2 纳米片的三维多孔气凝胶组件
DOI：
10.1016/j.compositesb.2021.109591
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发表时间：
2022-02
期刊：
影响因子：
--
通讯作者：
Guo Lin
中科院分区：
文献类型：
--
作者：
Zhao Hewei;Zeng Xiaolong;Zheng Tian;Liu Shaojia;Yang Jie;Hao Rui;Li Fengshi;Guo Lin
高容量、超快充放电速率和长循环寿命是锂离子电池（LIB）满足现代能量存储的外部目标，但同时实现它们仍然具有挑战性。在此，我们报道了一种三维（3D）多孔rGO@SnO2纳米片气凝胶（rGO@SnO2NSA），该气凝胶基于在氧化石墨烯（GO@SnO2NS）上原位生长二维（2D）SnO 2纳米片，随后可控组装和还原。SnO 2的2D结构可以缩短电子传递路径，3D气凝胶的多孔结构赋予气凝胶外部离子传递通道和卓越的电容贡献。因此，使用我们的3D气凝胶作为阳极的LIB可以承受超快的充电/放电（10 A g−1）速率，并表现出超长的循环寿命和高能量密度（10，000次循环后为512.1 mAh g− 1）。对于应用探索，LiFePO 4/rGO@SnO2NSA电池还具有优异的储能性能（100次循环后为364.5 mAh g− 1）。我们结合2D活性材料和3D多孔结构的电极设计策略为开发下一代可充电储能设备提供了新的途径。
High capacity, ultra-fast charge/discharge rate, and long cycling life are external targets for Lithium-ion batteries (LIBs) to satisfy modern energy storage, but it is still challenging to realize them simultaneously. Here, we report a three-dimensional (3D) porous rGO@SnO2nanosheets aerogel (rGO@SnO2NSA) based on in-situ growing two-dimensional (2D) SnO2nanosheets on graphene oxide (GO@SnO2NS), subsequent controllable assembly and reduction. The 2D structure of SnO2can shorten the electron-transfer path, and the porous architecture of the 3D aerogel endows the aerogels with external ion-transfer channels and exceptional capacitive contribution. As a result, the LIBs using our 3D aerogels as anodes can endure ultrafast charge/discharge (10 A g−1) rate and exhibit ultra-long cycling life with a high energy density (512.1 mAh g−1after 10,000 cycles). For application exploration, the LiFePO4/rGO@SnO2NSA cell also possesses excellent energy storage performance (364.5 mAh g−1after 100 cycles). Our electrode design strategy of combining 2D active materials and 3D porous architecture provides a new path to develop next-generation rechargeable energy storage devices.
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