Tailoring grain boundary structures and chemistry of Ni-rich layered cathodes for enhanced cycle stability of lithium-ion batteries

Pengfei Yan, Jianming Zheng, Jian Liu, Biqiong Wang, Xiaopeng Cheng, Yuefei Zhang, Xueliang Sun (), Chongmin Wang () and Ji-Guang Zhang ()
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Pengfei Yan: Pacific Northwest National Laboratory
Jianming Zheng: Pacific Northwest National Laboratory
Jian Liu: University of Western Ontario
Biqiong Wang: University of Western Ontario
Xiaopeng Cheng: Beijing University of Technology
Yuefei Zhang: Beijing University of Technology
Xueliang Sun: University of Western Ontario
Chongmin Wang: Pacific Northwest National Laboratory
Ji-Guang Zhang: Pacific Northwest National Laboratory

Nature Energy, 2018, vol. 3, issue 7, 600-605

Abstract: Abstract A critical challenge for the commercialization of layer-structured nickel-rich lithium transition metal oxide cathodes for battery applications is their capacity and voltage fading, which originate from the disintegration and lattice phase transition of the cathode particles. The general approach of cathode particle surface modification could partially alleviate the degradation associated with surface processes, but it still fails to resolve this critical barrier. Here, we report that infusing the grain boundaries of cathode secondary particles with a solid electrolyte dramatically enhances the capacity retention and voltage stability of the cathode. We find that the solid electrolyte infused in the boundaries not only acts as a fast channel for lithium-ion transport, it also, more importantly, prevents penetration of the liquid electrolyte into the boundaries, and consequently eliminates the detrimental factors, which include cathode–liquid electrolyte interfacial reactions, intergranular cracking and layered-to-spinel phase transformation. This grain-boundary engineering approach provides design ideas for advanced cathodes for batteries.

Date: 2018
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DOI: 10.1038/s41560-018-0191-3

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