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Enhanced Electrochemical Performance of LiNi0.5Mn1.5O4 Cathode Material by YPO4 Surface Modification
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-21 00:00:00 , DOI: 10.1021/acssuschemeng.7b03935 Tinghua Xu 1 , Yaping Li 1 , Dandan Wang 1 , Muying Wu 2 , Du Pan 1 , Huiling Zhao 1 , Ying Bai 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-03-21 00:00:00 , DOI: 10.1021/acssuschemeng.7b03935 Tinghua Xu 1 , Yaping Li 1 , Dandan Wang 1 , Muying Wu 2 , Du Pan 1 , Huiling Zhao 1 , Ying Bai 1
Affiliation
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Cathode material LiNi0.5Mn1.5O4 (LNMO) for lithium-ion batteries is successfully synthesized by a sol–gel method and is further modified by a thin layer of YPO4 (1, 3, and 5 wt %) through a simple wet chemical strategy. Physical characterizations indicate that the YPO4 nanolayer has a little impact on the cathode structure. Electrochemical optimization reveals that the 3 wt % YPO4-coated LNMO could still deliver a high specific capacity of 107 mAh g–1 after 240 cycles, with a capacity retention of 77.5%, much higher than that of the pristine electrode. Electrochemical impedance spectroscopy (EIS) analysis proves that the rapid increase of surface impedance could be suppressed by the YPO4 coating layer and thus facilitates the surface kinetics behavior in repeated cycling. Through further material aging experiments, the improvement of electrochemical performances could be attributed to the formation of Lewis acid YF3, converted from the YPO4 coating layer in the LiPF6-based electrolyte, which not only scavenges the surface insulating alkaline species with a high acidity but also accelerates ion exchange on the material surface and thus helps to generate the solid solution Li–Ni–Mn–Y–O on the surface of YPO4-coated LNMO.
中文翻译：
YPO 4表面改性增强LiNi 0.5 Mn 1.5 O 4正极材料的电化学性能
用于锂离子电池的正极材料LiNi 0.5 Mn 1.5 O 4（LNMO）已通过溶胶-凝胶法成功合成，并通过简单的湿法涂覆了一层薄的YPO 4（1、3和5 wt％）进行了改性化学策略。物理特征表明，YPO 4纳米层对阴极结构的影响很小。电化学优化表明，涂覆3 wt％的YPO 4的LNMO仍可提供107 mAh g –1的高比容量。240次循环后，容量保持率为77.5％，远高于原始电极。电化学阻抗谱（EIS）分析表明，YPO 4涂层可以抑制表面阻抗的快速增加，从而有利于重复循环中的表面动力学行为。通过进一步的材料老化实验，电化学性能的提高可归因于路易斯酸YF 3的形成，该酸是从LiPF 6中的YPO 4涂层转化而来的系电解质，它不仅可清除表面绝缘碱性物种具有高酸度，而且加速了材料表面上的离子交换，从而有助于产生YPO的表面上的固溶体Li-Ni类的Mn-Y-O 4 -涂层的LNMO。
更新日期：2018-03-21
中文翻译：
YPO 4表面改性增强LiNi 0.5 Mn 1.5 O 4正极材料的电化学性能
用于锂离子电池的正极材料LiNi 0.5 Mn 1.5 O 4（LNMO）已通过溶胶-凝胶法成功合成，并通过简单的湿法涂覆了一层薄的YPO 4（1、3和5 wt％）进行了改性化学策略。物理特征表明，YPO 4纳米层对阴极结构的影响很小。电化学优化表明，涂覆3 wt％的YPO 4的LNMO仍可提供107 mAh g –1的高比容量。240次循环后，容量保持率为77.5％，远高于原始电极。电化学阻抗谱（EIS）分析表明，YPO 4涂层可以抑制表面阻抗的快速增加，从而有利于重复循环中的表面动力学行为。通过进一步的材料老化实验，电化学性能的提高可归因于路易斯酸YF 3的形成，该酸是从LiPF 6中的YPO 4涂层转化而来的系电解质，它不仅可清除表面绝缘碱性物种具有高酸度，而且加速了材料表面上的离子交换，从而有助于产生YPO的表面上的固溶体Li-Ni类的Mn-Y-O 4 -涂层的LNMO。
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