摘要
碳基材料是目前锂离子电池最常用的电极材料,然而低温使基于碳基电极的锂离子电池(LIB)容量损失巨大。本文将农业废弃物——稻壳通过高温碳化制得多孔碳,多孔为锂离子(Li^(+))提供更多传输路径及活性位点,并促进Li^(+)在低温下的传输与扩散。研究发现,不同碳化温度对稻壳衍生活性炭(RHC)的微观结构有影响,基于不同RHC电极构建的电池性能也不同。其中,碳化温度为1 000℃获得的RHC-10负极具有最高的剩余可逆比容量,在0.2 C和2 C倍率下循环100圈后可达230和147 mAh/g;在不同倍率下循环10圈后再次在0.2C倍率下循环时,仍能保持最高的可逆比容量;在-20和-40℃可逆比容量分别可达175和98 mAh/g,表现出优异的低温充放电性能。
Carbon based materials are currently the most commonly used electrode materials for lithium-ion batteries,although significant capacity loss in carbon based lithium-ion batteries(LIBs)is caused by low temperature.In this paper,porous carbon was prepared from rice husks through high-temperature carbonization.Porosity provides more transport pathways and active sites for Li^(+),as well as promotes the transport and diffusion.The results indicated that carbonization temperatures have an impact on the microstructure of rice husk derived active carbon(RHC),and the performance of batteries constructed based on various RHC electrodes was different.The RHC-10 negative electrode obtained at 1000℃has the highest residual reversible specific capacity,reaching 230 mA/g at 0.2 C magnification and 147 mAh/g at 2 C magnification after 100 cycles,respectively.After 10 cycles at different magnification,the highest reversible specific capacity can still be maintained when cycling again at 0.2 C magnification.The reversible specific capacity can reach 175 mAh/g and 98 mAh/g at-20℃and-40℃,respectively,demonstrating excellent low-temperature charging and discharging performance.
作者
穆泊源
杨宗松
董伟
王宗花
MU Boyuan;YANG Zongsong;DONG Wei;WANG Zonghua(College of Chemistry and Chemical Engineering,Qingdao University,Qingdao 266071,China;Zhejiang Huawei Door Products Co.,Ltd.,Lishui 323000,China;College of Materials Science and Engineering,Liaoning Technical University,Fuxin 123000,China)
出处
《功能材料》
CAS
CSCD
北大核心
2024年第4期4019-4028,4050,共11页
Journal of Functional Materials
基金
国家自然科学基金青年基金项目(21808095)。
关键词
无定形碳
锂离子电池
负极材料
低温性能
稻壳
amorphous carbon
lithium-ion batteries
negative electrode material
low temperature performance
rice husk
