PEDOT：PSS @分子筛作为双功能添加剂，可增强富镍NMC锂离子电池的电化学性能和稳定性,Energy Technology

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PEDOT：PSS @分子筛作为双功能添加剂，可增强富镍NMC锂离子电池的电化学性能和稳定性
Energy Technology ( IF 3.6 ) Pub Date : 2020-08-19 , DOI: 10.1002/ente.202000339
Xiaoyin Xue ₁ , Hao Zhang ₁ , Shuai Yuan _{1,

2} , Liyi Shi _{1,

2} , Yin Zhao ₁ , Zhuyi Wang ₁ , Haijun Chen ₃ , Jiefang Zhu ₄

Affiliation

涂有导电聚合物（PEDOT：PSS）的分子筛（MS）用作水清除剂，以修饰富镍的LiNi ₁ – _x_–_y Co _x Mn _y O ₂（NMC）层阴极。该策略可主动捕获电池系统中的残留水，而不会影响电子和Li ⁺离子的传输性能。水分含量和核磁共振（NMR）测试表明，涂覆后的MS仍保持良好的吸水特性并抑制电解质的分解。PEDOT：PSS @ MS‐NMC电极的电导率为1.08×10 ^-4 S cm ^-1与MS-NMC电极相比提高了63.9％。通过X射线光电子能谱，透射电子显微镜和扫描电子显微镜测量，还表明PEDOT：PSS @ MS-NMC电极的表面结构稳定性和颗粒完整性得到了很好的保留。经过500次循环后，复合阴极的容量保持率为71.3％，高于NMC（38.3％）和MS-NMC阴极（62.4％）。这是一种新颖有效的策略，可抑制电极界面处的副反应，并改善电极的稳定性，容量保持率和富Ni NMC阴极的循环性能。

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PEDOT:PSS @Molecular Sieve as Dual‐Functional Additive to Enhance Electrochemical Performance and Stability of Ni‐Rich NMC Lithium‐Ion Batteries

Molecular sieves (MSs) coated with conductive polymer (PEDOT:PSS) are used as water scavengers to modify the nickel‐rich LiNi_1–x–yCo_xMn_yO₂ (NMC)‐layered cathode. This strategy proactively captures residual water in the battery system without affecting the transport performance of electrons and Li⁺ ions. The moisture content and nuclear magnetic resonance (NMR) tests show that MSs after coating still maintain good water absorption characteristics and inhibit the decomposition of the electrolyte. The conductivity of the PEDOT:PSS@MS‐NMC electrode is 1.08 × 10⁻⁴ S cm⁻¹, which is improved by 63.9%, compared with the MS‐NMC electrode. Through X‐ray photoelectron spectroscopy, transmission electron microscopy, and scanning electron microscopy measurements, it is also shown that the surface structure stability and particle integrity for PEDOT:PSS@MS‐NMC electrode is well retained. After 500 cycles, the capacity retention of the composite cathode is 71.3%, which is higher than that of the NMC (38.3%) and MS‐NMC cathode (62.4%). This is a novel and effective strategy to suppress side reactions at the electrode interface and improve electrode stability, capacity retention, and cycle performance of the Ni‐rich NMC cathode.

更新日期：2020-10-05

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