
原子界面催化合成SnP/CoP异质纳米晶嵌入碳杂化物用于高功率型锂离子电池
Chen Hu, Yanjie Hu, Aiping Chen, Xuezhi Duan, Hao Jiang, Chunzhong Li
工程(英文) ›› 2022, Vol. 18 ›› Issue (11) : 154-160.
原子界面催化合成SnP/CoP异质纳米晶嵌入碳杂化物用于高功率型锂离子电池
Atomic Interface Catalytically Synthesizing SnP/CoP Hetero-Nanocrystals within Dual-Carbon Hybrids for Ultrafast Lithium-Ion Batteries
磷化锡(SnP)具有极佳的锂离子扩散能力和高理论比容量,是高功率锂离子电池的理想负极材料。然而,SnP的合成难度高,大尺寸晶粒导致的电化学不可逆也阻碍了其应用。根据密度泛函理论(DFT)计算,使用原位催化磷化方法可以显著降低SnP的相对生成能。因此,在还原氧化石墨烯(rGO)包裹的碳骨架内合成了SnP/CoP异质纳米晶。所得复合材料具有超快充放电能力(50 A·g−1时容量为260 mA·h·g−1),且循环1500次不会出现容量衰减(2 A·g−1时容量为645 mA·h·g−1)。充放电机理分析表明尺寸为4.0 nm的SnP/CoP纳米晶具有高反应可逆性,且CoP在较高电位生成的金属Co加速了低电位SnP反应的动力学,从而赋予材料超快充放电能力。相对电流密度的有限元模拟进一步验证了这一现象。
Tin phosphides are attractive anode materials for ultrafast lithium-ion batteries (LIBs) because of their ultrahigh Li-ion diffusion capability and large theoretical-specific capacity. However, difficulties in synthesis and large size enabling electrochemical irreversibility impede their applications. Herein, an in situ catalytic phosphorization strategy is developed to synthesize SnP/CoP hetero-nanocrystals within reduced graphene oxide (rGO)-coated carbon frameworks, in which the SnP relative formation energy is significantly decreased according to density functional theory (DFT) calculations. The optimized hybrids exhibit ultrafast charge/discharge capability (260 mA·h·g−1 at 50 A·g−1) without capacity fading (645 mA·h·g−1 at 2 A·g−1) through 1500 cycles. The lithiation/delithiation mechanism is disclosed, showing that the 4.0 nm sized SnP/CoP nanocrystals possess a very high reversibility and that the previously formed metallic Co of CoP at a relatively high potential accelerates the subsequent reaction kinetics of SnP, hence endowing them with ultrafast charge/discharge capability, which is further verified by the relative dynamic current density distributions according to the finite element analysis.Graphical abstractDownload : Download high-res image (191KB)Download : Download full-size image
催化磷化 / 磷化锡 / 异质纳米晶 / 快速充电 / 锂离子电池
Catalytic phosphorization / SnP / Hetero-nanocrystals / Fast charging / Li-ion batteries
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