LiCoO_2梯度包覆LiNi_(0.96)Co_(0.04)O_2电极材料的电化学性能  

Electrochemical Performance of LiCoO_2 Gradient Coated LiNi_(0.96)Co_(0.04)O_2 Cathode

作　　者：顾大明[1] 史鹏飞[1] 宋振业[1] 张鼎[1] 

机构地区：[1]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《无机化学学报》2005年第5期725-728,共4页Chinese Journal of Inorganic Chemistry

基　　金：黑龙江省自然科学基金项目(No.E2004-24)资助;黑龙江科技攻关项目(No.GZ04A307)资助;哈尔滨重点科技攻关项目(No.2004AA5CG077)资助。

摘　　要：LiCoO2 gradient coated LiNi0.96Co0.04O2 material and iso-structure LiNi0.8Co0.2O2 material (the same molar ratio 8/2 of Ni/Co in the two materials) as cathode for lithium-ion batteries were synthesized with a co-precipitation method. Microstructure of iso-structure LiNi0.8Co0.2O2 were about the same as that of LiNiO2, and the structure of the coated material was much more similar to that of LiCoO2 based on the X-ray diffraction patterns. The cycling voltammetry and galvanostatic cycle tests show that the properties of the coated material were improved significantly. The first specific charge and discharge capacity for the coated material was 249.20 mAh·g-1 and 207.90 mAh·g-1 respectively, and the specific discharge capacity for the 100th cycle was still 186.02 mAh·g-1 with an irreversible loss of only 21.1 mAh·g-1. This showed that the new material had a good lithium intercalation-deintrercalation performance. Meanwhile, the mechanism of the sintering reaction was proposed. During the sintering reaction of the precursor with LiOH, the Li+-ion permeated into the body of precursors because the shape of the precursor particles was not changed basically based on scanning electronic microscopy. So, the layer microstructure of the precursor is important for the layer microstructure of lithium nickel cobalt oxides electrode material.LiCoO2 gradient coated LiNi0.96Co0.04O2 material and iso-structure LiNi0.08CoO2 material (the same molar ratio 8/2 of Ni/Co in the two materials) as cathode for lithium-Ion batteries were synthesized with a co-precipitation method. Microstructure of iso-structure LiNi0.8Co0.2O2 were about the same as that of LiNiO2, and the structure of the coated material was much more similar to that of LiCoO2 based on the X-ray diffraction patterns. The cycling voltammetry and galvanostatic cycle tests show that the proper-ties of the coated material were improved significantly. The first specific charge and discharge capacity for the coated material was 249.20 mAh• g(-1) and 207.90 mAh• g(-1) respectively, and the specific discharge capacity for the 100(th) cycle was still 186.02 mAh• g(-1) with an irreversible loss of only 21.1 mAh• g(-1). This showed that the new material had a good lithium intercalation-deintrercalation performance. Meanwhile, the mechanism of the sintering reaction was proposed. During the sintering reaction of the precursor with LiOH, the Li(+)ion permeated into the body of precursors because the shape of the precursor particles was not changed basically based on scanning electronic microscopy. So, the layer microstructure of the precursor is important for the layer microstructure of lithium nickel cobalt oxides electrode material.

关 键 词：LICOO2 LINI0.8CO0.2O2 电化学性能 电极材料 performa 包覆 梯度 with LINIO2 cobalt the and ratio was first shape more show LiOH The met new 

分 类 号：TM912.2[电气工程—电力电子与电力传动] TG139.7[一般工业技术—材料科学与工程]