Nanorod-Nanoflake Interconnected LiMnPO4·Li3V2(PO4)3/C Composite for High-Rate and Long-Life Lithium-Ion Batteries.
Olivine-type structured LiMnPO4has been extensively studied as a high-energy density cathode material for lithium-ion batteries. However, preparation of high-performance LiMnPO4is still a large obstacle due to its intrinsically sluggish electrochemical kinetics. Recently, making the composites from both active components has been proven to be a good proposal to improve the electrochemical properties of cathode materials. The composite materials can combine the advantages of each phase and improve the comprehensive properties. Herein, a LiMnPO4·Li3V2(PO4)3/C composite with interconnected nanorods and nanoflakes has been synthesized via a one-pot, solid-state reaction in molten hydrocarbon, where the oleic acid functions as a surfactant. With a highly uniform hybrid architecture, conductive carbon coating, and mutual cross-doping, the LiMnPO4·Li3V2(PO4)3/C composite manifests high capacity, good rate capability, and excellent cyclic stability in lithium-ion batteries. The composite electrodes deliver a high reversible capacity of 101.3 mAh g-1at the rate up to 16 C. After 4000 long-term cycles, the electrodes can still retain 79.39% and 72.74% of its maximum specific discharge capacities at the rates of 4C and 8C, respectively. The results demonstrate that the nanorod-nanoflake interconnected LiMnPO4·Li3V2(PO4)3/C composite is a promising cathode material for high-performance lithium ion batteries.
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Xinxin
X
Cao
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Anqiang
A
Pan
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Yifang
Y
Zhang
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Jiwei
J
Li
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Zhigao
Z
Luo
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Xin
X
Yang
School of Material Science and Engineering, Central South University , Changsha, Hunan 410083, China.
Shuquan
S
Liang
Department of Materials Science & Engineering, University of Washington , Seattle, Washington 98195, United States.
Guozhong
G
Cao
LiMnPO4·Li3V2(PO4)3/C; cathode materials; hybrid nanostructure; lithium-ion batteries; phosphates