Modifying the Cathode–Electrolyte Interphase by Sulfone-Based Additive to Enhance the Electrochemical Performance of LiNi0.5Mn1.5O4,ACS Applied Energy Materials

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Modifying the Cathode–Electrolyte Interphase by Sulfone-Based Additive to Enhance the Electrochemical Performance of LiNi0.5Mn1.5O4
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2021-12-21 , DOI: 10.1021/acsaem.1c03150
Youguo Huang _{1,

2} , Yan Li _{1,

2} , Chunlei Tan _{1,

2,

3} , Zhikang Huang _{1,

2} , Qichang Pan _{1,

2} , Youqi Chu _{1,

2} , Fenghua Zheng _{1,

2} , Hongqiang Wang _{1,

2} , Qingyu Li _{1,

2}

Affiliation

LiNi_0.5Mn_1.5O₄ (LNMO) is considered one of the most promising cathode materials for high-energy-density lithium-ion batteries (LIBs). However, the practical application of the LNMO cathode is seriously limited by the poor cycling performance. Hence, methyl phenyl sulfone (MPS) is investigated as an electrolyte additive to modify the cathode–electrolyte interphase and furthermore enhance the electrochemical performance of the LNMO cathode at a high voltage (5 V class). Results evidenced that the cycling performance of LNMO/Li cells was improved remarkably and with a high capacity retention of 89.8% after 400 cycles at 1 C in the 0.1 wt % MPS-containing electrolyte. Subsequently, the rate capability is also significantly improved with a high capacity of 110.2 mAh g^–1 even at 5 C. Furthermore, the reason for the much-improved electrochemical performance of the LNMO/Li cell is further investigated in detail. Our investigation reveals that MPS additive can alleviate the decomposition of LiPF₆ and is oxidized to form a protective layer, which inhibits the decomposition of electrolyte and dissolution of transition metals and then stabilizes the structure of the LNMO cathode during the cycling process. As a result, such a functional additive provides a cost-efficient choice to achieve the high performance of the LNMO cathode in high-voltage LIBs.

中文翻译：

砜基添加剂改性阴极-电解质界面以提高LiNi0.5Mn1.5O4的电化学性能

锂镍_0.5锰_1.5 O ₄（LNMO）被认为是高能量密度锂离子电池（LIB）最有前途的正极材料之一。然而，LNMO正极的实际应用受到循环性能差的严重限制。因此，研究甲基苯砜（MPS）作为电解质添加剂，以修饰正极-电解质界面，并进一步提高 LNMO 正极在高压（5 V 级）下的电化学性能。结果表明，在含 0.1 wt% MPS 的电解液中，LNMO/Li 电池的循环性能显着提高，在 1 C 下循环 400 次后容量保持率高达 89.8%。随后，倍率能力也得到显着提升，达到 110.2 mAh g ^{-1的高容量}甚至在 5℃。此外，进一步详细研究了 LNMO/Li 电池的电化学性能大大提高的原因。我们的研究表明，MPS添加剂可以减轻LiPF ₆的分解并被氧化形成保护层，从而抑制电解质的分解和过渡金属的溶解，从而在循环过程中稳定LNMO正极的结构。因此，这种功能性添加剂为实现 LNMO 正极在高压 LIB 中的高性能提供了一种具有成本效益的选择。

更新日期：2022-01-24

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