CAJ | 학술논문

为了提高材料LiCo1/3Ni1/3MnO2的循环件能,采用浸渍-水解法对其进行TiO2包覆.用X射线衍射(XRD)、电化学交流阻抗谱(EIS)、电感耦合等离子体发射光谱(ICP-OES)和恒流允放电测试研究包覆材料的结构和电化学性能.TiO2仅在材料表面形成包覆层,并未改变材料的结构.TiO2包覆能提高材料LiCo1/3Ni1/3Mn1/3O2的倍率性能和循环性能,TiO2包覆后的材料在5.0C(1.0C=160 mA·g-1)下的放电容量达到0.2C下的66.0%,而包覆前的材料在5.0C下的放电容量仅为其0.2C下的31.5%.包覆后的材料在2.0C下循环12周后的容最没有衰减,而未包覆的材料容量保持率仅为94.4%.EIS测试表明包覆材料性能的提高是由于循环过程中材料的界面稳定性得到了提高.循环后材料的XRD和ICP-OES测试表明,包覆层能提高材料LiCo1/3Ni1/3Mn1/3O2的结构稳定性.
위료제고재료LiCo1/3Ni1/3MnO2적순배건능,채용침지-수해법대기진행TiO2포복.용X사선연사(XRD)、전화학교류조항보(EIS)、전감우합등리자체발사광보(ICP-OES)화항류윤방전측시연구포복재료적결구화전화학성능.TiO2부재재료표면형성포복층,병미개변재료적결구.TiO2포복능제고재료LiCo1/3Ni1/3Mn1/3O2적배솔성능화순배성능,TiO2포복후적재료재5.0C(1.0C=160 mA·g-1)하적방전용량체도0.2C하적66.0%,이포복전적재료재5.0C하적방전용량부위기0.2C하적31.5%.포복후적재료재2.0C하순배12주후적용최몰유쇠감,이미포복적재료용량보지솔부위94.4%.EIS측시표명포복재료성능적제고시유우순배과정중재료적계면은정성득도료제고.순배후재료적XRD화ICP-OES측시표명,포복층능제고재료LiCo1/3Ni1/3Mn1/3O2적결구은정성.
A method to improve the cycling performance of LiCo1/3Co1/3Ni1/3Mn1/3O2 in lithium-ion bakeries by coating with TiO2 using an/n-situ dipping and hydrolyzing method was presented in this work.The effect of the TiO2 coating on the structure and electrochemical properties of LiCO1/3Ni1/3Mn1/3O2 Was investigated using X-ray diffraction(XRD),electrochemical impedance spectroscopy(EIS),inductively coupled plasma-optical emission spectroscopy(ICPoOES), and galvanostatic charge/discharge testing.TiO2 forms a layer on the surface of LiCO1/3Ni1/3Mn1/3O2 without destroying the structure of the CON material.The TiO2-coated LiCo1/3Mn1/3O2 possesses better rate capability and cyclability than the uncoated material.The capacity of the TiO2-coated material at 5.0C(1.OC=160 mA·g-1)reaches 66.0% of that achieved at 0.2c,while the capacity of the uncoated LiCO1/3Ni1/3O2 obtains a value of only 31.5%.The rate of capacity retention after 12 cycles at 2.0C for the coated sample is about 1 00%.which is much better than that of the uncoated material(94.4%).EIS shows that the reason for this improvement in the capacity of the coated material is the enhanced interface stability during cycling.XRD and ICP-OES tests taken after cycling indicate that the TiO2-coating Can enhance the structural stabihty of LiCo1/3Ni1/3MnO2.