LiNi0.8-x Znx Co0.2 O2的合成及电化学性能研究

材料科学与工艺, 2004, 12(6): 586-589. doi: 10.3969/j.issn.1005-0299.2004.06.008

LiNi0.8-x Znx Co0.2 O2的合成及电化学性能研究

顾大明 ^1, , 史鹏飞 ^2, , 顾健 ^3, , 谷芳 ^4, , 高原 ^5,

1.哈尔滨工业大学,理学院,黑龙江,哈尔滨,150001

2.哈尔滨工业大学,理学院,黑龙江,哈尔滨,150001

3.哈尔滨工业大学,理学院,黑龙江,哈尔滨,150001

4.哈尔滨工业大学,理学院,黑龙江,哈尔滨,150001

5.哈尔滨工业大学,理学院,黑龙江,哈尔滨,150001

基金项目: 黑龙江省哈尔滨市科技攻关项目(2004AA5CG077) 黑龙江省自然科学基金(E2004-24) 黑龙江省科技攻关项目(GZ04A307)

关键词：锌掺杂 , 锂离子电池 , 正极材料 , 比容量

Synthesis and characterization of LiNi0.8-x Znx Co0.2 O2 as cathode materials for lithium-ion battery

掺杂改性和表面修饰的LiNi0.8Co0.2O2是锂电池正极换代候选材料.采用共沉淀法制备了系列LiNi0.8-xZnxCo0.2O2材料,并对其进行X射线衍射(XRD)、扫描电镜(SEM)、循环伏安(CV)、电化学阻抗(EIS)和充放电循环性能(CP)测试分析.恒流循环(0.2C、3.0～4.2V)测试结果显示,Zn的掺入使材料的初始放电比容量有大幅增加,循环性能有所改善.其中LiNi0.78Zn0.02Co0.2O2的首次放电比容量达到206.37 mAh·g-1.第30循环时,放电比容量仍为204.03 mAh·g-1,不可逆容量损失仅为2.34 mAh·g-1,显示了很好的初期循环性能.

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