Ionic Conductive Interface Boosting High Performance LiNi0.8Co0.1Mn0.1O2 for Lithium Ion Batteries,ACS Applied Energy Materials

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Ionic Conductive Interface Boosting High Performance LiNi0.8Co0.1Mn0.1O2 for Lithium Ion Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-03-19 00:00:00 , DOI: 10.1021/acsaem.9b02008
Wen Liu _{1,

2} , Xifei Li _{1,

2,

3} , Youchen Hao _{1,

2} , Hirbod Maleki Kheimeh Sari _{1,

2} , Jian Qin _{1,

2} , Wei Xiao _{1,

2} , Xiujuan Wang _{1,

2} , Huijuan Yang _{1,

2} , Wenbin Li _{1,

2} , Liang Kou ₄ , Zhanyuan Tian ₄ , Le Shao ₄ , Cheng Zhang ₄ , Jiujun Zhang _{1,

2,

5}

Affiliation

LiNi_0.8Co_0.1Mn_0.1O₂ (NCM) is a highly prospective cathode material for high energy density Li-ion batteries (LIBs). Nevertheless, poor cycling performance and rate capability at high cutoff voltages have dramatically blocked its further commercialization. In this study, an ionic conductive interface has been demonstrated to enhance the NCM electrochemical property at the high cutoff voltage of 4.5 V on account of the existence of a Li-ion conductor of Li₂SnO₃. In comparison to SnO₂, Li₂SnO₃ causes a smoother Li-ion diffusion at the engineered interfaces, lower polarization, slower capacity drop, and voltage fading as well as better H2/H3 reversibility upon cycling. Importantly, it is confirmed that excellent diffusion is beneficial to preservation of reversible phase transition and reduction of polarization, which are directly relative to the superior cyclability and rate capability. This work reveals that building an excellent ionic diffusion interface is feasible for Ni-rich cathodes with simultaneous high capacity and stable cyclability.

中文翻译：

离子导电界面增强了锂离子电池的高性能LiNi _0.8 Co _0.1 Mn _0.1 O ₂

LiNi _0.8 Co _0.1 Mn _0.1 O ₂（NCM）是用于高能量密度锂离子电池（LIB）的极具前景的阴极材料。然而，在高截止电压下较差的循环性能和速率能力极大地阻碍了其进一步的商业化。在这项研究中，由于存在Li ₂ SnO ₃的锂离子导体，已证明离子导电界面可在4.5 V的高截止电压下增强NCM电化学性能。与SnO ₂相比，Li ₂ SnO ₃导致锂离子在工程界面上的扩散更加顺畅，极化率降低，容量下降较慢，电压下降以及循环时H2 / H3的可逆性更好。重要的是，已证实优异的扩散有益于保持可逆的相变和减少极化，这直接与优异的循环能力和速率能力相关。这项工作表明，建立一个出色的离子扩散界面对于富镍阴极同时具有高容量和稳定的循环能力是可行的。

更新日期：2020-03-19

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