Lithium manganate positive electrode material for lithium ion batteries and preparation method of lithium manganate positive electrode material

A battery lithium manganese oxide and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficulty in meeting the requirements of long battery life of power lithium batteries, restrictions on large-scale industrial applications, and poor stability, and achieve Suppresses oxygen defects, improves structural stability, and avoids the effect of reduction

Inactive Publication Date: 2018-11-27
HENAN INST OF SCI & TECH
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature cycle stability of this cathode material is poor, especially the high-temperature cycle performance is difficult to meet the requirements of long battery life for power lithium batteries, which seriously restricts the large-scale industrial application of this material.

Method used

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  • Lithium manganate positive electrode material for lithium ion batteries and preparation method of lithium manganate positive electrode material
  • Lithium manganate positive electrode material for lithium ion batteries and preparation method of lithium manganate positive electrode material

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preparation example Construction

[0037] The present invention also provides a preparation method of lithium manganate cathode material for lithium ion battery, comprising the following steps:

[0038] providing a mixed powder comprising a lithium source, a manganese source and a dopant source; the dopant source comprises a silicon source, a zirconium source or a titanium source;

[0039] The molar ratio of lithium source, manganese source and dopant source in the mixed powder is 1: [1.9,2): (0,0.1];

[0040] (2) pre-sintering and re-sintering the mixed powder obtained in the step (2) successively to obtain LiMn 2-x m x o 4 Nucleus; the pre-sintering temperature is 400-450°C, and the pre-sintering time is 4-6h; the re-sintering temperature is 750-825°C, and the re-sintering time is 12-18h; the M is Si , Zr or Ti;

[0041] (3) LiMn obtained in said step (2) 2-x m x o 4 In situ synthesis of fast ion conductor cladding on the surface of the core to obtain primary core-shell materials;

[0042] (4) In-situ...

Embodiment 1

[0098] according to figure 1 The flow chart shown prepares lithium manganate cathode material for lithium ion batteries:

[0099] The absolute ethanol solution of lithium carbonate, manganese tetraoxide and ethyl orthosilicate was mixed according to the molar ratio of Li, Mn and Si of 1.05:1.95:0.05, and wet ball milled for 3 hours. After ball milling, the obtained mixed slurry was transferred to an evaporating dish for drying. Finally, grind the dried mixture evenly and place it in a muffle furnace for pre-calcination at 450°C for 4 hours, then grind it again and place it in a muffle furnace for final firing at 800°C for 18 hours to obtain LiMn 1.95 Si 0.05 o 4 .

[0100] 10g of LiMn 1.95 Si 0.05 o 4 Ultrasonic dispersion in a mixed solution of absolute ethanol and deionized water, then dissolve 0.35g tetraethyl orthosilicate in absolute ethanol, and then mix the absolute ethanol solution of tetraethyl orthosilicate with the mixed solution of nuclei Afterwards, ammonia ...

Embodiment 2

[0106] The absolute ethanol solution of lithium hydroxide, electrolytic manganese dioxide and nano-titanium dioxide was mixed according to the molar ratio of Li, Mn and Ti of 1.05:1.95:0.05, and wet ball milled for 3 hours. After ball milling, the obtained mixed slurry was transferred to an evaporating dish for drying. Finally, grind the dried mixture evenly and place it in a muffle furnace for pre-calcination at 400°C for 6 hours, then grind it again and place it in a muffle furnace for final firing at 780°C for 15 hours to obtain LiMn 1.95 Ti 0.05 o 4 .

[0107] According to the molar ratio of lanthanum, strontium, manganese and cobalt as 0.7:0.3:0.7:0.3, dissolve lanthanum nitrate, strontium nitrate, manganese nitrate and cobalt nitrate in deionized water at 50°C, and add lemon Acid acts as a chelating agent, and ammonia water is added dropwise to adjust the pH of the solution to 3. Then, the solution was heated to 70°C, and 10 g of LiMn was added 1.95 Mg 0.05 o 4 , ...

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Abstract

The invention in particular relates to a lithium manganate positive electrode material for lithium ion batteries and a preparation method of the lithium manganate positive electrode material. Spinel type lithium manganate is modified by adopting a collaborative optimization scheme of high-valence doping and two-phase co-coating, the defect that reversible capacity of the material is often sacrificed during the conventional low-valence doping and surface coating is overcome, the structural stability of the material is obviously improved, and the diffusion rate of lithium ions of the material and the electronic conductivity are simultaneously improved. LiMn2-xMxO4 serves as the core, reduction of Mn<3+> during the conventional high-valence doping modification is avoided, oxygen vacancy is inhibited, and the diffusion rate of the lithium ions is improved to a certain degree; and due to collaborative optimization modification of the two-phase shell layer and high-valence doping, the service life of the material can be greatly prolonged by utilizing the synergistic effect of the two. Results of the embodiment show that the core-shell positive electrode material for the lithium ion battery provided by the invention has the capacity retention ratio of 95.8% after cycling for 100 times under the condition of 55 DEG C.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery positive electrode materials, and in particular relates to a lithium ion battery lithium manganate positive electrode material and a preparation method thereof. Background technique [0002] As an energy system that realizes the conversion and storage of chemical energy and electrical energy, chemical power sources have developed relatively maturely, and a variety of high-performance battery products have been formed, such as widely used lead-acid batteries and nickel-cadmium batteries. Although these traditional chemical power sources have the advantages of stable quality and high reliability, they will cause serious environmental pollution in the process of battery product manufacturing, especially the damage caused by improper disposal of waste batteries to the living environment of human beings, which will seriously threaten human life and health. In contrast, as a new type of che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/62H01M4/624H01M10/0525Y02E60/10
Inventor 赵红远李勇峰苏建修王占奎吴婷婷李芳李冬冬李博
Owner HENAN INST OF SCI & TECH
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