Mitigating the Microcracks of High-Ni Oxides by InSitu Formation of Binder between Anisotropic Grains for Lithium-Ion Batteries

ACS Applied Materials & Interfaces
Yan-Yun SunLan-Chun Zhang

Abstract

Increasing attention has been paid to layered high-Ni oxides with high capacity as a promising cathode for high-energy lithium-ion batteries. However, the undesirable microcracks in secondary particles usually occur due to the volume changes of anisotropic primary grains during cycles, which lead to the decay of electrochemical performance. Here, for the first time, a functional electrolyte with di-sec-butoxyaluminoxytriethoxysilane additive integrating the functions of silane and aluminate is proposed to in situ form the binder-like filler between anisotropic primary grains for mitigating the microcracks of high-Ni oxides. It is demonstrated that Li-containing aluminosilicate as a glue layer between the gaps of grains and as a coating layer on the surface of the grains is generated, and these features further enhance the interfacial bonding and surface stability of anisotropic primary grains. Consequently, the microcracks along with side reactions and phase transitions of high-Ni oxides are mitigated. As anticipated, the electrochemical performance and thermal stability of high-Ni oxides are improved, and there is also a capacity retention of 75.4% even after 300 cycles and large reversible capacity of ∼160 mA h g-1 at 5 C. Th...Continue Reading

References

Jun 20, 1996·Chemical Reviews·Abraham Ulman
Jun 25, 2014·Nano Letters·Eung-Ju LeeYang-Kook Sun
Mar 27, 2015·ACS Applied Materials & Interfaces·Feng WuShi Chen
Aug 12, 2016·ACS Applied Materials & Interfaces·Hoogil LeeYong Min Lee
Sep 14, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Seol Heui Jang, Taeeun Yim
Jan 25, 2018·ACS Applied Materials & Interfaces·Chaoping LiangKyeongjae Cho
Jun 12, 2018·ACS Applied Materials & Interfaces·Kyoungmin MinEunseog Cho

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