Method for preparing multi-element co-doped lithium manganate composite material
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of lithium heteromanganate and composite materials, which is applied in the field of new energy material preparation, can solve the problems of poor electrochemical performance, low initial discharge capacity, and low discharge capacity, and achieve low cost, low synthesis temperature, and improved rate performance Effect
Inactive Publication Date: 2018-09-14
NANJING UNIV OF SCI & TECH
View PDF5 Cites 5 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
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 e...
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0029] (1) Preparation of lithium salt and citric acid solution: when preparing the solution, LiOH·H 2 O and citric acid monohydrate were dissolved in 25ml of deionized water at a molar ratio of 1.02:1, and stirred until completely dissolved;
[0030] (2) Preparation of manganese salt, aluminum salt, cobalt salt, and magnesium salt mixture: after weighing manganese acetate tetrahydrate, aluminum nitrate nonahydrate, magnesium acetate tetrahydrate, and cobalt acetate tetrahydrate, dissolve them in 50ml deionized water, and magnetically Stir well;
[0031] (3) Solution mixing: under constant magnetic stirring at 50°C, slowly drop the prepared mixture of manganese salt, aluminum salt, cobalt salt, and magnesium salt into the mixed solution of lithium salt and citric acid, and stir magnetically for 10 minutes. , adjust the pH of the mixed solution to be 8 with ammonia water;
[0032] (4) Preparation of sol and xerogel: continuously stir the above mixed solution on a magnetic heati...
Embodiment 2
[0043] This example is basically the same as Example 1, the only difference is that in the mixing process of (3) the solution, the stirring temperature is 45°C, which is almost the same as the electrochemical performance of the sample prepared at the stirring temperature of 50°C, but stirring is required A little longer.
Embodiment 3
[0045] This example is basically the same as Example 1, the only difference is that in the mixing process of (3) the solution, the stirring temperature is 55°C, which is almost the same as the electrochemical performance of the sample prepared at the stirring temperature of 50°C, and the stirring time similar.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more