采用丙烯酸热聚合法合成富锂锰基材料,并使用钨酸锂对富锂锰基材料表面进行包覆改性。通过扫描电子显微镜、X射线衍射仪、交流阻抗谱等多种测试方法对材料的物理化学性能进行表征分析,对比包覆前后材料的电化学性能,考察了钨酸锂包覆对富锂锰基材料的影响。结果表明:在钨酸锂的包覆与保护下,钨酸锂包覆量为2%(质量分数)的富锂锰基材料首次放电比容量为210.16mAh/g,充放电效率为61.12%,在1C条件下循环100圈后比容量仍保持155mAh/g。
Lithium-rich manganese-based materials were synthesized by thermal polymerization of acrylic acid,and then their surfaces were modified by coating with lithium tungstate.The physicochemical properties of the materials were characterized and analyzed using multiple testing techniques,including scanning electron microscopy (SEM),X-ray diffraction (XRD),and alternating current impedance spectroscopy (EIS).The electrochemical performance of the materials before and after coating was compared to investigate the effect of lithium tungstate coating on lithium-rich manganese-based materials.The results indicated that,under the coating and protection of lithium tungstate,the lithium-rich manganese-based material with a lithium tungstate coating amount of 2% (mass fraction) exhibited an initial discharge specific capacity of 210.16mAh/g and a charge-discharge efficiency of 61.12%.After 100 cycles at 1C,the specific capacity remained at 155mAh/g.
[1] Liang S,Yan W,Wu X,et al.Gel polymer electrolytes for lithium ion batteries:fabrication,characterization and perfor-mance[J].Solid State Ionics,2018,318:2-18.
[2] Le J,Balasubramanian M,Ceder G,et al.A new class of high capacity cation-disordered oxides for rechargeable lithium batteries:Li-Ni-Ti-Mo oxides[J].Energy & Environmental Science,2015,8:3255-3265.
[3] Thackeray M M.Exploiting the spinel structure for Li-ion battery applications:a tribute to John B.Goodenough[J].Advanced Energy Materials,2021,11(2):20011171-20011178.
[4] 李想,葛武杰,王昊,等.高镍系三元层状氧化物正极材料容量衰减机理的研究进展[J].无机材料学报,2017,32(2):113-121.
[5] Yu R,Wang G,Liu M,et al.Mitigating voltage and capacity fading of lithium-rich layered cathodes by lanthanum doping[J].Journal of Power Sources,2016,335:65-75.
[6] 陈垒,樊俊豪,马翠环,等.溶胶-凝胶法制备富锂锰基材料[J].现代化工,2020,40(4):143-147.
[7] Liang Y,Li S,Xie J,et al.Synthesis and electrochemical characterization of Mg-Al co-doped Li-rich Mn-based cathode materials[J].New Journal of Chemistry,2019,43(30):12004-12012.
[8] 崔军辉.基于共沉淀法制备汽车用锂电池富锂锰基正极材料[J].工业加热,2021,50(5):44-45.
[9] 吴汉杰,梁兴华,毛杰.富锂锰基正极材料Li1.2Ni0.13Co0.13Mn0.54O2的制备与电化学特性研究[J].化工新型材料,2016,44(9):139-141.
[10] 廖达前,习小明,高雄,等.熔盐燃烧法制备富锂锰基正极材料[J].电池,2016,46(4):200-203.
[11] 任蓝天.喷雾干燥法用于镍钴锰三元正极材料合成的研究进展[J].山东化工,2020,49(8):85-86.
[12] Seaby T,Lin T E,Hu Y X,et al.An analysis of F-doping in Li-rich cathodes[J].Rare Metals,2022,41(6):1771-1796.
基金资助
河南工程学院横向项目(HKJ2024146)
PDF
