Faculty

Personal Information

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Alma Mater:北京科技大学

Discipline:Materials Science

Education Level:With Certificate of Graduation for Doctorate Study

Degree:博士

School/Department:材料科学与工程学院

E-Mail:

Business Address:北京市海淀区学院路30号北京科技大学工程实践基地306

Lianfang

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Professional Title:Professor

Supervisor of Doctorate Candidates

Paper Publications

Improved Rate Capability of Li-Rich Cathode Materials by Building a Li+-Conductive LixBPO4+ x/2 Nanolayer from Residual Li2CO3 on the Surface

Journal:Chem. Electro. Chem
Abstract:Lithium- and manganese-rich layered oxides face great challenges for practical applications, including gradual voltage decay upon normal charge/discharge cycling and the relatively low volumetric energy density. This series of materials generally suffer from a great reduction in reversible capacity with an increase of the current density and the loading density of the electrode, which can be attributed to the low Li+ conductivity of the material, as previously reported. Herein, BPO4 is proposed to encapsulate Li1.16(Ni0.25Mn0.75)0.84O2 (LNMO) particles and is expected to form a Li-doped LixBPO4+ x/2 (LBP) layer as a lithiumion conductor on the particle surface to facilitate the transportation of Li+ across the solidliquid interface. The results confirm that the LBP layer was formed, providing a lithium-ion diffusion path and suppressing the undesired interfacial reactions. A LNMO sample coated with 1.6 mol% LBP (LBP@LNMO) demonstrated excellent rate capability, retaining 90.2, 80.2, 61.2, and 43.5 % at 1, 2, 5, and 10 C rates of the capacity at the 0.5 C
Indexed by:Journal paper
Translation or Not:no
Date of Publication:2017-01-01