Enhanced electrochemical performance of LiAlO 2 -LiMnPO 4 /C composite using LiAlO 2 from AAO synthesis by hydrothermal
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ORIGINAL PAPER
Enhanced electrochemical performance of LiAlO2-LiMnPO4/C composite using LiAlO2 from AAO synthesis by hydrothermal rout Longjiao Chang 1,2 & Shaohua Luo 3 & Sinan Li 3 & Xiaoshi Lang 1 & Xinyue San 1 & Jianan Liu 2 & Junzhe Li 4 Received: 19 March 2020 / Revised: 6 May 2020 / Accepted: 6 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Lithium aluminate (LiAlO2) has been successfully synthesized by a hydrothermal reaction based on using the anodic alumina (AAO) as the template and explored as the compound materials in LiMnPO4/C lithium battery. LiAlO2 nanoplate porous structure is inherited from anodic aluminum oxide (AAO) structure and serves as substrates to grow LiMnPO4 nanocrystals, which provide a high surface area with a porous structure. The morphology, structure, and electrochemical properties of the samples were analyzed. The instruments used in this process are X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscope (HRTEM), and charge-discharge test system. The crystallization transition process of the precursor after hydrothermal reaction was researched by thermal gravity analysis. The specific surface area and pore volume of LiAlO2 are 118.6 m2/g and 0.89 cm3/g, which were confirmed by the method of nitrogen adsorption. Moreover, the 10% content LiAlO2-LiMnPO4/C has the excellent electrochemical performance, and its first discharge capacity is 144 mAh/ g at 0.1 C, compared with the LiMnPO4/C electrode (121 mAh/g at 0.1 C). The LiAlO2 can obstruct the direct contact of electrode and electrolyte, thus reducing their direct contact areas of cathode at charged state, owing to the fact that LiAlO2 around the active surfaces of LiMnPO4 grains acts as an ionic conductive wiring. Keywords Lithium-ion batteries . Cathode material . LiMnPO4 . Lithium aluminate composite . Electrochemical performance
Introduction In recent years, LiMnPO4 cathode materials have been positioned a significant place in the field of energy storage devices due to its low cost, nontoxicity, high energy capacity, long cycle life, and structure stability [1–5]. However, the low electronic conductivity and low ionic conductivity of olivine structure materials are two predominant drawbacks, which
* Longjiao Chang [email protected] * Shaohua Luo [email protected] 1
School of New Energy, Bohai University, Jinzhou 121013, Liaoning, China
2
Liaoning Key Laboratory of Engineering Technology Research Center of Silicon Materials, Jinzhou 121013, Liaoning, China
3
School of Resources and Materials, Northeastern University at Qinghuangdao, Qinghuangdao 066004, Hebei, China
4
School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, Anhui, China
make its theoretical capacity much higher than the practical capacity [6–11]. Therefore, there are many alternative methods to solve the problems. For example, reduce particle size [12–14], coat conductive materials on the surface [15–17], and dope with divalent c
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