학술논문
多元有机酸自组装硅碳复合材料用于高效储锂 / Multicomponent organic acid self-assembled silicon carbon composite for high efficiency lithium storage
Document Type
Academic Journal
Author
贲淼; 刘少卿; 陶丽娟; 李群寅; 张燕青; 刘建文; BEN Miao; LIU Shaoqing; TAO Lijuan; LI Qunyin; ZHANG Yanqing; LIU Jianwen
Source
湖北大学学报（自然科学版） / Journal of Hubei University（Natural Science Edition）. 46(1):107-114
Subject
Language
Chinese
ISSN
1000-2375
Abstract
相比于传统物理打浆式简易硅碳材料的复合,本工作利用自组装的方式让有机酸碳源材料与纳米硅粉进行内部结合,羧酸碳源保护层在抑制硅材料膨胀的同时,通过相互间串联起的网络增加导电性,得到稳定性更好的硅碳复合负极材料.该方法首先在纳米硅粉表面进行修饰,使其表面带上氨基,通过酰胺化反应,让柠檬酸与纳米硅键合.此外过量的碳源材料包附于外层,形成多个单纳米硅颗粒聚集的微米级多核卵壳型颗粒.这种结构使得该电极材料在电流密度 500 mA/g 下,经过 600 圈的长循环下具有 1 073.4 mAh/g 的比容量.在 2 A/g 的电流密度下,初始比容量为751.2 mAh/g,在 300 圈循环后比容量维持在 573.0 mAh/g,容量保持率为 76.3%.该实验工作为锂离子电池硅碳负极材料的合成提供了一种简单低成本的实用性合成思路.
Compared with compounding the silicon-carbon material simplely by traditional physical beating method,a self-assembly approach was used to combine organic acid carbon-source materials internally with nano-silicon powder in this thesis.The carboxylic acid carbon source protection layer not only inhibited the expansion of silicon material,but also increased the electrical conductivity through the network connected in series between molecules,so that the silicon carbon composite anode material with better stability could be obtained.In this method,the surface of nano-silicon powder was firstly coated with amino group.And then through amidation reaction,citric acid was bonded with nano-silicon.In addition,excessive carbon source material was attached to the outer layer,forming micron-level multi-nucleated egg shell particles with multiple single nano-silicon particles.This structure enabled the electrode material to have a specific capacity of 1 073.4 mAh/g at a current density of 500 mA/g and after a long cycle of 600 turns.Under the current density of 2 A/g,the specific capacity was maintained at 573.0 mAh/g from the initial 751.2 mAh/g after 300 cycles.the capacity retention rate was 76.3%.This thesis provides a simple,low cost and practical idea for the synthesis of silicon carbon anode materials for lithium ion batteries.
Compared with compounding the silicon-carbon material simplely by traditional physical beating method,a self-assembly approach was used to combine organic acid carbon-source materials internally with nano-silicon powder in this thesis.The carboxylic acid carbon source protection layer not only inhibited the expansion of silicon material,but also increased the electrical conductivity through the network connected in series between molecules,so that the silicon carbon composite anode material with better stability could be obtained.In this method,the surface of nano-silicon powder was firstly coated with amino group.And then through amidation reaction,citric acid was bonded with nano-silicon.In addition,excessive carbon source material was attached to the outer layer,forming micron-level multi-nucleated egg shell particles with multiple single nano-silicon particles.This structure enabled the electrode material to have a specific capacity of 1 073.4 mAh/g at a current density of 500 mA/g and after a long cycle of 600 turns.Under the current density of 2 A/g,the specific capacity was maintained at 573.0 mAh/g from the initial 751.2 mAh/g after 300 cycles.the capacity retention rate was 76.3%.This thesis provides a simple,low cost and practical idea for the synthesis of silicon carbon anode materials for lithium ion batteries.