LiBOB存在下磷酸改性LiNi0.5Mn1.5O4阴极提高锂离子电池循环性能

IF 2.3 Q3 ELECTROCHEMISTRY International journal of electrochemistry Pub Date : 2019-07-04 DOI:10.1155/2019/8636540
Maheeka Yapa Abeywardana, N. Laszczynski, M. Kuenzel, D. Bresser, S. Passerini, B. Lucht
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引用次数: 16

摘要

LiNi0.5Mn1.5O4(LNMO)的工作电压为4.8 vs Li/Li+,理论容量为147 mAh g−1,是先进锂离子电池的一种有趣的正极材料。然而,电解质在电极处的分解会逐渐降低电池的容量。在本研究中,用磷酸(PA)对LNMO阴极的表面进行了改性,以提高LNMO/石墨全电池的容量。通过表面分析证实了PA对LNMO阴极的改性。此外,双(草酸)硼酸锂(LiBOB)作为电解质添加剂的存在进一步增强了PA改性的LNMO/石墨电池的性能。PA改性的阴极和含有LiBOB的电解质的性能提高可归因于抑制了Mn和Ni在阳极上的沉积。元素分析表明,与具有标准电解质的未改性LNMO/石墨电池相比,Mn和Ni的溶解显著减少。
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Increased Cycling Performance of Li-Ion Batteries by Phosphoric Acid Modified LiNi0.5Mn1.5O4 Cathodes in the Presence of LiBOB
LiNi0.5Mn1.5O4 (LNMO), which has an operating voltage of 4.8 vs Li/Li+ and a theoretical capacity of 147 mAh g−1, is an interesting cathode material for advanced lithium ion batteries. However, electrolyte decomposition at the electrode can gradually decrease the capacity of the battery. In this study, the surface of the LNMO cathode has been modified with phosphoric acid (PA) to improve the capacity of the LNMO/graphite full cell. Modification of LNMO cathodes by PA is confirmed by surface analysis. Additionally, the presence of lithium bis-(oxalato) borate (LiBOB) as an electrolyte additive further enhances the performance of PA modified LNMO/graphite cells. The improved performance of PA modified cathodes and electrolytes containing LiBOB can be attributed to the suppressed Mn and Ni deposition on the anode. Elemental analysis suggests that the Mn and Ni dissolution is significantly reduced compared to unmodified LNMO/graphite cells with standard electrolyte.
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