A Modification of LiMn<sub>2</sub>O<sub>4</sub> by Ionic Conductive Agent and Electronic Conductive Agent Coating
- 1 Hangzhou Narada Power Technology Co., Ltd., Hangzhou, China
- 2 Hangzhou Narada Power Technology Co., Ltd., Hangzhou, China
- 3 Hangzhou Narada Power Technology Co., Ltd., Hangzhou, China
- 4 Hangzhou Narada Power Technology Co., Ltd., Hangzhou, China
Abstract
Carbon was used as electronic conductive agent, and metasilicic acid lithium (Li 2 SiO 3 ) as ionic conductive agent, the two factors were investigated cooperatively. We evaluated their effect by using spherical spinel LiMn<sub>2</sub>O<sub>4</sub> which prepared ourselves as cathode material. Then Li<sub>2</sub> SiO<sub> 3</sub> /carbon surface coating on LiMn<sub> 2</sub> O<sub>4</sub> (LMO/C/LSO) which Li<sub> 2</sub> SiO<sub> 3</sub> inside and carbon/Li<sub> 2</sub> SiO<sub> 3</sub> coated LiMn<sub> 2</sub> O<sub> 4</sub> (LMO/LSO/C) were prepared, All of materials were characterized by X-ray diffraction (XRD) and electrochemical test; spherical LiMn 2 O 4 was characterized by scanning electron microscopy (SEM); and coated materials were characterized by transmission electron microscopy (TEM). While uncoated spinel LiMn<sub> 2</sub> O<sub> 4</sub> maintained 72% of capacity in 60 cycles by the rate of 0.2C, and LMO/LSO/C showed the best electrochemical performance, 89% of the initial capacity remained after 75 cycles at 0.2C. Furthermore, the rate performance of LMO/LSO/C also improved obviously, about 30 mAh·g -1 of capacity attained at the rate of 5C, higher than LMO/C/LSO and bare LiMn<sub> 2</sub> O<sub> 4</sub> .
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