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在高性能SiOC阳极中Si-O-C和自由碳单元的关键作用:通过前体功能组调节组成

Cheng Qian¹, Yanxia Liu^1,2, Fengtao Chai^1,3

¹Henan Key Laboratory of Electrochemical Energy Storage Process, Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou, P. R. China.

Small (Weinheim an der Bergstrasse, Germany)

|December 31, 2025

概括

氧化碳 (SiOC) 阳极对离子电池具有前景. Si-O-C 单元是离子的主机,而自由碳增强导电性,提高性能和稳定性.

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:

氧化碳 (SiOC) 是离子电池的一个有前途的阳极材料,因为它的体积扩张率低,循环稳定性高.
在SiOC阳极中Si-O-C四面体单位和自由碳 (C_free) 的特定电化学贡献仍然不清楚.

研究的目的:

合成和描述不同结构和组成的SiOC材料.
阐明SiOC阳极中Si-O-C单元和C自由的电化学作用.
建立结构-性能关系,以优化SiOC阳极设计.

主要方法:

使用水解,多重凝结和不同有机功能组的西兰酸盐的热解来合成球形和块状SiOC材料.
电化学表征包括容量,速率能力和循环稳定性测试.
对有机功能组对SiOC材料特性影响的分析.

主要成果:

确定Si-O-C四面体单位是主要的离子宿主,可逆性单位增加增强容量和伪容量行为.
自由碳 (C_free) 形成了导电网络,改善了电子传输和活性站点利用.
球形SiOC-VTES样本在0.1 A g-1下表现出1244.2 mAh g-1的可逆容量,并在1000个循环后在2.0 A g-1下保持662.4 mAh g-1 (86.4%的保留率).

结论:

在SiOC阳极性能中,Si-O-C单元和C_free起着不同的但互补的作用.
优化可逆单元和无C的比率对于高容量和稳定的SiOC阳极至关重要.
这些发现为设计下一代离子电池的先进SiOC材料提供了基础.

关键词:

氧化 (SiOC) 的阳极是没有碳的自由碳.离子储存机制的离子储存机制有机的功能组是有机的功能组.可逆结构单位是可逆的结构单位.

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