来自周期性半孔有机的羊毛梯度结构SiOx阳极使高性能离子电池成为可能
Quan Ouyang1, Guangshe Li1, Xin Zhang1
1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, Jilin, 130012, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 29, 2023
概括
渐变结构的氧化 (SiOx) 阳极提供了增强的电池性能. 这项研究开发了一种蛋黄梯度结构的SiOx/碳阳极,证明了卓越的循环稳定性和先进能量存储的速度能力.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术纳米技术
背景情况:
- 梯度结构材料对于先进的电池和电催化剂至关重要.
- 基于氧化 (SiOx) 的阳极显示出潜力,但由于体积膨胀,其循环稳定性不佳.
- 现有的阳极设计难以平衡导电性,副作用和减压.
研究的目的:
- 开发一种新的黄皮梯度结构的SiOx基阳极 (YSG-SiOx/C@C).
- 通过解决体积膨胀和提高导电性来提高SiOx阳极的电化学性能.
- 为了利用周期性半孔有机球 (PMOs) 的选择性蚀刻,实现独特的结构控制.
主要方法:
- 通过选择性无机二氧化蚀刻来制造黄结构的PMO.
- 用碳涂覆黄PMO以形成YSG-SiOx/C@C.
- 梯度结构,组成和电化学性质的表征.
主要成果:
- YSG-SiOx/C@C阳极表现出独特的梯度结构,其中有一个用于SiOx扩张的空隙空间.
- 观察到电导率的提高和副作用的减少.
- 特殊的循环稳定性:627 mAh g-1 在0.5 A g-1.1的400个循环后.
- 优异的速率能力:519 mAh g-1 在2 A g-1.1后550个周期后.
结论:
- 开发的黄皮梯度结构有效地减轻了SiOx体积变化的压力.
- 与传统阳极相比,YSG-SiOx/C@C表现出优越的循环稳定性和速度性能.
- 这种方法为设计用于储能应用的高性能基阳极提供了有希望的策略.
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