Highly [010]-oriented, gradient Co-doped LiMnPO4 with enhanced cycling stability as cathode for Li-ion batteries

Springer Science and Business Media LLC - Tập 24 - Trang 511-519 - 2020
Ruijie Wang1, Jinyun Zheng1, Xiangming Feng1, Ge Yao1, Huiting Niu1, Qingyi Liu1, Weihua Chen1
1College of Chemistry, Zhengzhou University, Zhengzhou, People’s Republic of China

Tóm tắt

LiMnPO4 has been attracting attention for high energy density (701 Wh kg−1) and excellent safety. However, LiMnPO4 suffers from the cycling instability coming from the fragile solid electrolyte interface, besides the Jahn-Teller effect of Mn3+, the poor electrical conductivity and the sluggish ionic conductivity. The substitution of cation with less ionic radius for Mn2+ is conducive to stabilize the solid-electrolyte interface and retard the erosion from electrolyte; therefore, the gradient Co-doped LiMn0.98Co0.02PO4 was synthesized with 25.93 (mol) % Co on the surface by the secondary solvothermal method, and the permeated depth reaches more than 20 nm because of the coprecipitation and cation exchange of Co2+ and Mn2+. LiMn0.98Co0.02PO4/Li cell that demonstrates the cycling performance is remarkably enhanced with 87% capacity retention after 380 cycles at room temperature, even 87% after 100 cycles at 60 °C. Meanwhile, the preferential growth along the a–c plane results in the highly [010]-oriented LiMnPO4 by the solvothermal, which afford more channels for Li+ migration by exposing more reaction sites, and the infrared spectrum also reflects the less Mn2+-Li+ antisite defects in the crystal. So the samples show the superior rate performance as well.

Tài liệu tham khảo

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