欢迎访问《电化学(中英文)》期刊官方网站,今天是
研究论文

LiNi_(0.8-x)Al_xCo_(0.2)O_2制备与电极性能的研究

  • 张军 ,
  • 金忠 ,
  • 杨清河 ,
  • 宋庆梅 ,
  • 马晓华 ,
  • 宗祥福
展开
  • 复旦大学材料科学系,复旦大学材料科学系,复旦大学材料科学系,复旦大学材料科学系,复旦大学材料科学系,复旦大学材料科学系 上海200433 ,上海200433 ,上海200433 ,上海200433 ,上海200433 ,上海200433

收稿日期: 2002-08-28

  修回日期: 2002-08-28

  网络出版日期: 2002-08-28

Synthesis and Characterization of LiNi_(0.8-x)Al_xCo_(0.2)O_2 as Cathodes for Lithium-ion Batteries

  • ZHANG Jun ,
  • JIN Zhong_kao ,
  • YANG Qing_he ,
  • SONG Qing_mei ,
  • MA Xiao_hua ,
  • ZONG Xiang_fu
Expand
  • (Department of Material Science, Fudan University, Shanghai 200433,China

Received date: 2002-08-28

  Revised date: 2002-08-28

  Online published: 2002-08-28

摘要

采用高温固相反应法合成具有良好层状结构的LiNi0 .8-xAlxCo0 .2 O2 .研究发现 ,LiNi0 .71Al0 .0 9Co0 .2 O2 材料经 2 0次循环充放电后 ,其放电容量仍达 15 2mAh/ g ,是首次放电容量的97.4 % .通过XRD结构测量、慢扫描循环伏安测试和电极经多次循环后其交流阻抗测试的对比 ,表明对LiNiO2 进行Al和Co共掺杂 ,增强了材料层状结构的稳定性 ,有效地抑制了Li+嵌入脱出过程中材料的相转变 ,其充放电性能、耐过充性和循环性能都得到明显改善 .热分析测试表明 ,在高脱锂状态下共掺杂材料的热稳定性也有所提高 .

本文引用格式

张军 , 金忠 , 杨清河 , 宋庆梅 , 马晓华 , 宗祥福 . LiNi_(0.8-x)Al_xCo_(0.2)O_2制备与电极性能的研究[J]. 电化学, 2002 , 8(3) : 306 -314 . DOI: 10.61558/2993-074X.1464

Abstract

Single_phase solid solution of LiNi 0.8- x Al x Co 0.2 O 2 (0≤ x <0.1)had been synthesized and characterized by X_ray diffraction(XRD) and scanning electron microscopy (SEM). Their electrochemical performance was examined by charge_discharge cycling.The LiNi 0.71 Al 0.09 Co 0.2 O 2 compound showed a discharge capacity of 152 mAh/g after 20 cycles that corresponds to 97.4% capacity retention. The beneficial effect of co_doping with Al and Co elements was corro_borated by slow scanning cyclic voltammograms(SSCV),electrochemical impedance spectrum(EIS)and differential scanning calorimetry(DSC) data on charged cathodes. These results show that the 2D_character of the crystal lattice was stabilized by co_doping with Al and Co, the phase transitions that occur during deintercalation or intercalation of Li_ions were significantly suppressed,and thermal stability in the charged state was also improved.
文章导航

/