凝胶燃烧法合成5 V级正极材料LiNi0.5Mn1.5O4及其高倍率放电性能

doi:10.3866/PKU.WHXB20100808

Abstract

Abstract:

Sub-micron LiNi_0.5Mn_1.5O₄ with excellent high rate performance was synthesized by a polyvinylpyrrolidone-assisted gel-combustion method. Thermogravimetric and differential thermal analyses (TG/DTA) were used to determine the nature of the combustion process of the gel. The structure and morphology of the as-prepared materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and cyclic voltammetry (CV). The results showed that the LiNi_0.5Mn_1.5O₄ powders were single-phase spinel and consisted of uniform secondary particles (5 μm), which were formed by small primary particles (500 nm). Galvanostatic charge-discharge tests indicated that the LiNi_0.5Mn_1.5O₄ had an excellent rate capability and cyclic performance. When discharged at a rate of 0.5C, 1C, 4C, 8C,and 10C between 3.5 and 4.9 V, the discharge capacity is 131.9, 127.6, 123.4, 118.4, and 113.7 mAh·g^-1, respectively. Upon long cycling under a high discharge rate of 10C, the capacity retentions after 100, 500, and 1000 cycles were 91.4%, 80.9%, and 73.5%, respectively.

Key words: Lithium ion battery, Cathode material, LiNi_0.5Mn_1.5O₄, Gel-combustion method, Polyvinylpyrrolidone

MSC2000:

O646

DAI Ke-Hua, MAO Jing, ZHAI Yu-Chun. High Rate Capability of 5 V LiNi_0.5Mn_1.5O₄ Cathode Materials Synthesized via a Gel-Combustion Method[J].Acta Phys. -Chim. Sin., 2010, 26(08): 2130-2134.

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High Rate Capability of 5 V LiNi_0.5Mn_1.5O₄ Cathode Materials Synthesized via a Gel-Combustion Method

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High Rate Capability of 5 V LiNi0.5Mn1.5O4 Cathode Materials Synthesized via a Gel-Combustion Method

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High Rate Capability of 5 V LiNi_0.5Mn_1.5O₄ Cathode Materials Synthesized via a Gel-Combustion Method