Method for preparing multi-element co-doped lithium manganate composite material

Abstract

The invention discloses a method for preparing a multi-element co-doped lithium manganate composite material. The method adopts a sol-gel method, firstly, a mixed solution of manganese acetate tetrahydrate, aluminum nitrate nonahydrate, magnesium acetate tetrahydrate, and cobalt acetate tetrahydrate is slowly added dropwise to a lithium hydroxide monohydrate and citric acid mixed solution under stirring, an ammonia solution is added to adjust the pH of the solution, and the mixture is heated and stirred until a sol is formed, the sol is dried to obtain a dry gel, and the dry gel is calcined and ground into powder, and finally calcined to obtain the aluminum-cobalt-magnesium three-element co-doped lithium manganate composite material. The method has the advantages of simple process, wide source of raw materials, large output, low cost and easy control, and is favorable for large-scale industrial production, and the prepared lithium ion battery positive electrode material has excellent rate charge and discharge performance and excellent cycle service life.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and relates to a preparation method of a multi-element co-doped lithium manganate composite material. Background technique [0002] As a new energy carrier, lithium-ion batteries have the advantages of high working voltage, light weight, small size, high energy density, long cycle life, and environmental protection, and have been successfully applied to energy storage systems for portable electronic devices. LiCoO is almost always used as the positive electrode material in commercial lithium-ion batteries. 2 Mainly. In order to reduce the cost of materials and make full use of natural resources with large reserves and low prices, it is of great significance to develop and produce spinel-type lithium manganese oxide as the positive electrode material of lithium-ion batteries. [0003] Spinel LiMn 2 o 4 As a new generation of battery cathode materials, it has the adv...

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Problems solved by technology

Single-element Mg-doped pure-phase LiMn prepared by Xiang et al. 2 o 4 The composite material LiMg 0.1 mn 1.9 o 4 , the electrochemical behavior test shows that the electrochemical performance is not good, and the initial discharge capacity is only 99.3mAh / g (Xiang et al.Rapidsynthesis of high-cycling performanceLiMg x mn 2-x o 4 (x≤0.20)cath-odematerials by a low-temperaturesolid-statecombustionmethod[J].Electrochim Acta,2014)

Yi et al prepared Al-doped LiMn by co-precipitation method 2 o 4 The composite material LiAl x mn 2-x o 4 , compared with undoped lithium manganese oxide, it has better cycle stability at higher temperature, but the reaction requirements are higher, and the overall discharge capacity is not high (X.Yi et al. Elevated temperature cyclic performance of LiAl x mn 2-x o 4 microspheres synthesized via co-precipitation route[J]. Alloys Compd, 2014)

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