摘要
采用La掺杂和固态电解质Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)_(3)包覆对LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)进行改性,研究掺杂和包覆对LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)结构与性能的影响。结果表明:适量的La掺杂可以降低LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)材料的离子迁移阻抗,提高Li^(+)扩散系数,稳定材料的结构,从而提高材料的放电比容量及循环性能,当La掺杂量为0.1 wt%时,首次放电比容量为180.1 mAh·g^(-1),经过100次循环后的容量保持率高达93.34%,远高于未掺杂样品的86.20%。Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)_(3)包覆可以抑制LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)材料与电解液的副反应,减少循环过程中生成的HF对材料的损害,稳定材料的结构,从而提高材料的循环性能,当包覆量为1 wt%时,100次循环后的容量保持率为74.74%,远高于未包覆材料的64.28%。
LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)was modified by La doping and solid-state electrolyte Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)_(3) coating,and the effects of doping and coating on the structure and properties of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)were studied.The results show that an appropriate amount of La doping can reduce the ion migration impedance of LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)material,improve the Li+diffusion coefficient,stabilize the material structure,and thereby improve the discharge specific capacity and cycling performance of the material.When the La doping amount is 0.1 wt%,the first discharge specific capacity is 180.1 mAh·g^(-1),and after 100 cycles,the capacity retention rate is as high as 93.34%,much higher than 86.20%of the undoped sample.Li_(1.3)Al_(0.3)Ti_(1.7)(PO4)_(3) coating can inhibit the side reaction between LiNi_(0.9)Co_(0.05)Mn_(0.05)O_(2)material and electrolyte,reduce the damage of HF generated during the cycling process to the material,stabilize the structure of the material,and improve the cycling performance of the material.When the coating amount is 1 wt%,the capacity retention rate after 100 cycles is 74.74%,much higher than 64.28%of the uncoated material.
作者
孔德昊
李卫
特古斯
吴含
廖波
Kong Dehao;Li Wei;Tegus O;Wu Han;Liao Bo(College of Physics and Electronic Information,Inner Mongolia Normal University,Hohhot 010022;Inner Mongolia Key Laboratory for Physics and Chemistry of Functional Materials,Hohhot 010022;Inner Mongolia Engineering Research Center for Rare Earth Functional and New Energy Storage Materials,Hohhot 010022,China)
出处
《广东化工》
CAS
2023年第18期4-7,14,共5页
Guangdong Chemical Industry
基金
国家自然科学基金资助项目(21865021)
内蒙古科技计划项目(2020GG0166)
内蒙古师范大学基本科研经费项目(2022JBXC025,2022JBZH010)。
