掺杂氧化镁的碳包覆氧化硅负极可提高锂离子电池的初始库仑效率

IF 8.9 2区 工程技术 Q1 ENERGY & FUELS
Runfeng Song , Lili Yang , Jingyi Luan , Hongyan Yuan , Shi Ji , Dengyuan Wan , Jie Liu , Wenbin Hu , Cheng Zhong
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引用次数: 0

摘要

亚氧化硅(SiOx)被认为是下一代锂离子电池(LIB)的潜在负极材料。然而,相对较低的初始库仑效率(ICE)阻碍了 SiOx 的发展。在此,我们报告了一种采用两步镁热还原法合成碳包覆掺杂氧化硅的氧化镁颗粒(MgSiO3-SiOx@C)的方法,该方法赋予了氧化硅作为锂离子电池负极的优异性能。综合表征结果表明,制备的 MgSiO3-SiOx@C 可以增加 ICE 并释放体积膨胀。因此,MgSiO3-SiOx@C 纳米结构显示出 85.4% 的高 ICE,同时还显示出相对稳定的循环性能,在 0.5C 下循环 100 次后可达到 759.2 mAh g-1,容量保持率为 59.8%。以 LiNi0.8Mn0.1Co0.1O2 为正极的锂离子全电池证明了其实际应用的可行性,在 1C 下循环 150 次后可提供 89.2 mAh g-1 的稳定可逆容量,容量保持率为 62.7%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

MgSiO3 doped, carbon-coated SiOx anode with enhanced initial coulombic efficiency for lithium-ion battery

MgSiO3 doped, carbon-coated SiOx anode with enhanced initial coulombic efficiency for lithium-ion battery
Silicon suboxide (SiOx) is considered as a potential negative material for next-generation lithium-ion battery (LIB). However, the relative low initial coulombic efficiency (ICE) hindered the development of SiOx. Herein, we report a two-step magnesiothermic reduction method to synthesize carbon-coated MgSiO3 doped SiOx particles (MgSiO3–SiOx@C), endowing it with superb properties as the anode of LIB. Comprehensive characterization demonstrates the as-prepared MgSiO3–SiOx@C can increase the ICE and releasing volume expansion. As such, the MgSiO3–SiOx@C nano-architectures exhibit a high ICE of 85.4 %, meanwhile, it also shows relatively stable cycling performance of 759.2 mAh g−1 after 100 cycles at 0.5C with the capacity retention of 59.8 %. The lithium ion full battery with LiNi0.8Mn0.1Co0.1O2 as positive electrode proves the feasibility of its practical application, which delivers a stable reversible capacity of 89.2 mAh g−1 after 150 cycles at 1C with a capacity retention of 62.7 %.
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来源期刊
Journal of energy storage
Journal of energy storage Energy-Renewable Energy, Sustainability and the Environment
CiteScore
11.80
自引率
24.50%
发文量
2262
审稿时长
69 days
期刊介绍: Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.
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