LaF3表面修饰Li[Li0.2Mn0.54Ni0.13Co0.13]O2的制备及其电化学性能

doi:10.11901/1005.3093.2016.468

材料研究学报

2017, Vol. 31

Issue (5): 394-400 DOI: 10.11901/1005.3093.2016.468

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LaF₃表面修饰Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂的制备及其电化学性能

李成冬^1,²(

), 姚志垒¹, 李举², 徐进¹, 熊新¹

1 盐城工学院汽车工程学院盐城 224051
2 江苏苏美达集团有限公司南京 210018

Preparation and Electrochemical Performance of LaF₃-coated Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ as Cathode Material for Lithium-ion Batteries

Chengdong LI¹(

), Zhilei YAO¹, Ju LI², Jin XU¹, Xin XIONG¹

1 School of Automotive Engineering, Yancheng Institute of Technology, Yancheng 224051, China
2 Jiangsu Sumec Group Corporation, Nanjing 210018, China

引用本文:

李成冬, 姚志垒, 李举, 徐进, 熊新. LaF₃表面修饰Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂的制备及其电化学性能[J]. 材料研究学报, 2017, 31(5): 394-400.
Chengdong LI, Zhilei YAO, Ju LI, Jin XU, Xin XIONG. Preparation and Electrochemical Performance of LaF₃-coated Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ as Cathode Material for Lithium-ion Batteries[J]. Chinese Journal of Materials Research, 2017, 31(5): 394-400.

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摘要:

分别以Na₂CO₃和NH₃H₂O为沉淀剂和络合剂,用共沉淀法和950℃高温烧结制备Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂,并用湿化学法将LaF₃包覆在Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂正极材料表层。用XRD, SEM, TEM等手段表征了LaF₃包覆前后Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂颗粒的微观结构和表面形貌,用电化学测试仪检测样品的充放电性能。结果表明, 包覆前后材料的结构没有变化,已经成功地将LaF₃包覆在Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂表面;LaF₃包覆使Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂的电化学综合性能明显提高。在5C高倍率下,LaF₃-Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂的放电比容量比原始Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂超过了20.3 mAhg^-1。经过100次循环后LaF₃-Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂的容量保持率高达94.8%,循环稳定性更佳。这些结果表明,LaF₃包覆改性是提高Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂电化学性能切实可行的方法。

关键词 ：材料合成与加工工艺, 锂离子电池, 共沉淀法

Abstract：

Cathode material of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ was synthesized firstly via co-precipitation method with Na₂CO₃ and NH₃H₂O as precipitation agent and complexing agent respectively and then followed by high temperature sintering process at 950^oC. Further, the prepared Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ was coated with LaF₃ through wet chemistry method. The Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂without and with LaF₃ coating was characterized by means of XRD, SEM, TEM. The results show that the Cathode material may be successfully coated with LaF₃ without changing its microstructure. Finally, the cathode material was examined by electrochemical means and which shows that its electrochemical properties were significantly enhanced after applying the LaF₃ coating. The specific discharge capacity of the LaF₃ coated Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ is 20.3 mAhg^-1 higher than that of bare Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ at 5C rate. Meanwhile, the LaF₃-Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ delivered an outstanding cycle stability with a high capacity retention of 94.8% after 100 cycles. Therefore, LaF₃ coating method could be an effective way to enhance the electrochemical properties of Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂.

Key words： synthesizing and processing technics lithium ion battery co-precipitation method Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ LaF₃ Li[Li_0.2Mn_0.54Ni_0.13Co_0.13]O₂ LaF₃

收稿日期: 2016-08-15

基金资助:国家自然科学基金(51407153)

作者简介:

作者简介李成冬,男,1983年生,讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.468 或 https://www.cjmr.org/CN/Y2017/V31/I5/394

图1 用LaF3包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2试样的XRD图谱

表1 LaF3包覆前后的Li[Li0.2Mn0.54Ni0.13Co0.13]O2试样的晶格结构参数和(003)与(104)衍射峰的强度比

图2 FeF3包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的SEM图(a)原始LMNCO, (b) LaF3-LMNCO, (c) LaF3- LMNCO的EDS图谱)

图3 LaF3包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的TEM图 (a)原始LMNCO, (b) LaF3-LMNCO (c) HR-TEM LaF3-LMNCO

图4 LaF3包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料在0.1C倍率下的首次充放电曲线

图5 LaF3`包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的倍率性能

图6 LaF3`包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的循环性能,2.0~4.6 V

图7 LaF3包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料的前三次循环伏安曲线

图8 LaF3包覆前后Li[Li0.2Mn0.54Ni0.13Co0.13]O2正极材料所组装的半电池的交流阻抗谱

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