Suppressing the Voltage Fading of Li[Li0.2Ni0.13Co0.13Mn0.54]O-2 Cathode Material via Al2O3 Coating for Li-Ion Batteries
Suppressing the Voltage Fading of Li[Li0.2Ni0.13Co0.13Mn0.54]O-2 Cathode Material via Al2O3 Coating for Li-Ion Batteries
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通过Al2O3涂层抑制锂离子电池Li[Li0.2Ni0.13Co0.13Mn0.54]O-2正极材料的电压衰减
DOI：
10.1149/2.0441809jes
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发表时间：
2018
影响因子：
3.9
通讯作者：
Xi Xiao-ming
中科院分区：
文献类型：
--
作者：
Zhou Chun-xian;Wang Peng-bo;Zhang Bao;Zheng Jun-chao;Zhou You-yuan;Huang Cheng-huan;Xi Xiao-ming
结构为xLi 2 MnO 3 粗体点(1–x) LiMO 2 (M= Mn y Ni z Co 1-yz, 0≤ y≤ 1, 0≤ z≤ 1, 0≤ y+ z≤ 1)的富锂层状材料是一种极具潜力的锂离子电池正极材料。然而，循环过程中的衰减电压严重阻碍了该材料的进一步发展。本研究采用共沉淀法合成Li[Li 0.2 Ni 0.13 Co 0.13 Mn 0.54] O 2 ，并通过溶胶-凝胶法表面涂覆Al 2 O 3 层进行改性。观察并研究放电电压衰减。结果表明，30 个循环后，原始材料的放电电压衰减为 0.33 V，而 Al 2 O 3 涂层样品的放电电压衰减为 0.15 V。 Al 2 O 3 包覆材料的平均放电电压得到改善，但在充放电循环过程中其劣化率得到有效抑制。通过非原位 XRD、XPS、TEM、CV 和 EIS 分析研究了其内在机制。结果表明，较低的放电电压衰减应归因于Al 2 O 3 涂层后富锂层状材料的结构变化较小、晶粒粗化较轻以及阻抗变化较小。
Lithium-rich layered material with the structure xLi 2 MnO 3 bold dot (1–x) LiMO 2 (M= Mn y Ni z Co 1-yz, 0≤ y≤ 1, 0≤ z≤ 1, 0≤ y+ z≤ 1) is a highly potential cathode candidate for lithium-ion batteries. However, the fading voltage during cycling has seriously hindered the further development of this material. In this study, Li [Li 0.2 Ni 0.13 Co 0.13 Mn 0.54] O 2 is synthesized through a co-precipitation method and modified by surface coating with Al 2 O 3 layer via sol-gel method. Discharge voltage fading is observed and investigated. Results show that the discharge voltage fading of the pristine material is 0.33 V after 30 cycles, compared to 0.15 V of the Al 2 O 3-coated sample. The average discharge voltage of the Al 2 O 3-coated material is improved, but its deterioration rate is suppressed effectively during the charge/discharge cycling. The intrinsic mechanism is investigated by ex situ XRD, XPS, TEM, CV, and EIS analysis. Results indicate that the lower discharge voltage fading should be ascribed to less structural change, lighter grain coarsening, and smaller impedance variation of the Li-rich layered material after Al 2 O 3 coating.