Facile and Efficient Fabrication of Li3PO4-coated Ni-rich Cathode for High-performance Lithium-ion Battery
Facile and Efficient Fabrication of Li3PO4-coated Ni-rich Cathode for High-performance Lithium-ion Battery
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简便高效地制备高性能锂离子电池用 Li3PO4 涂层富镍正极
DOI：
10.1016/j.apsusc.2019.144506
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发表时间：
2020-02
影响因子：
6.7
通讯作者：
Xunhui Xiong
中科院分区：
文献类型：
--
作者：
Pinjuan Zou;Zhihua Lin;Mengna Fan;Fei Wang;Yong Liu;Xunhui Xiong
层状富镍材料因其成本低、理论比容量高而成为锂离子电池正极材料的研究热点。然而，大多数富Ni材料在高电压下或暴露于空气后不表现出上级循环和倍率性能。在这项研究中，Li 3 PO 4包覆LiNi0.8Co0.1Mn0.1O2（NCM@LPO）开发使用一个简单的一锅溶胶-凝胶法，通过浸泡在疏水溶液中的NCM粉末。与通常使用的湿法涂覆方法不同，Li 3 PO 4涂层是在多聚磷酸和残余Li化合物之间的NCM表面沉淀反应中原位产生的，而无需额外的重新加热。锂导电Li 3 PO 4屏蔽减少了电极-电解质接触并抑制了副反应。因此，NCM@LPO样品在1C下100次循环后显示出88.4%的高容量留存率，并且在10 C下显示出148.8 mAh g-1的优异容量。NCM@LPO样品在空气中暴露7天，在1C下循环100次后，容量留存率仍高达84.6%，远高于原始NCM。该方法可用于提高其他镍基正极材料的循环稳定性和抑制其空气敏感性。
Owing to their low cost and high theoretical specific capacity, layered Ni-rich materials are extensively investigated as promising cathode materials for lithium-ion batteries. However, most Ni-rich materials do not exhibit superior cycle and rate capabilities at a high voltage or after exposure to air. In this study, Li3PO4-coated LiNi0.8Co0.1Mn0.1O2(NCM@LPO) is developed using a simple one-pot sol–gel method by immersing NCM powder in a hydrophobic solution. Unlike the commonly used wet-coating method, the Li3PO4coating layer is producedin situon the NCM surfaceviaprecipitation reaction between polyphosphoric acid and residual Li compounds without additional re-heating. The Li-conductive Li3PO4shield diminishes the electrode–electrolyte contact and suppresses the side reactions. Thus, the NCM@LPO sample shows a high capacity retention rate of 88.4% after 100 cycles at 1 C and an excellent capacity of 148.8 mAh g−1at 10 C. Furthermore, the capacity retention rate of NCM@LPO sample is still as high as 84.6% after 100 cycles at 1 C after exposed in air for 7 days, which is much higher than that of the pristine NCM. The facile and efficient approach can be used to boost the cycle stability and inhibit the air sensitivity of other Ni-based cathode materials.
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