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A kind of preparation method of lithium nickel manganese oxide cathode material with thin flake microscopic morphology

A microscopic morphology, lithium nickel manganese oxide technology, applied in the field of lithium-ion batteries, can solve the problems of many steps, long time, limited development, etc., and achieve the effect of simple process flow

Active Publication Date: 2017-08-25
HONGHE COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has many steps and takes a long time, which limits its development.

Method used

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  • A kind of preparation method of lithium nickel manganese oxide cathode material with thin flake microscopic morphology
  • A kind of preparation method of lithium nickel manganese oxide cathode material with thin flake microscopic morphology
  • A kind of preparation method of lithium nickel manganese oxide cathode material with thin flake microscopic morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Lithium nitrate, lithium acetate, manganese nitrate, manganese acetate, nickel nitrate, nickel acetate (Li:Mn:Ni=1:1.5:0.5 (molar ratio)) according to nitrate: acetate = 1:1 (molar ratio) The proportion of dissolved in deionized water, control the total concentration of metal ions to 1.5M. Afterwards, the filter paper was cut into squares with a side length of 2 cm and completely immersed in the raw material solution, heated to 60° C. for 1 hour, and then filtered. Put the filtered product into an oven, heat and solidify at 150°C for 2 hours, then move the cured product into a muffle furnace, bake at 700°C for 2 hours, and cool in the furnace to obtain sample 1.

Embodiment 2

[0026] Lithium nitrate, lithium acetate, manganese nitrate, manganese acetate, nickel nitrate, nickel acetate (Li:Mn:Ni=1:1.5:0.5 (molar ratio)) according to nitrate: acetate=0.5:1 (molar ratio) The proportion of dissolved in deionized water, control the total concentration of metal ions to 1M. Afterwards, the filter paper was cut into squares with a side length of 2 cm and completely immersed in the raw material solution, heated to 60° C. for 1 hour, and then filtered. The filtered product was directly put into a muffle furnace with a preset temperature of 750° C. for 2 hours and then air-cooled to obtain sample 2.

[0027] Table 1 The battery performance test data table of the example sample (0.5C charge, 1C discharge)

[0028]

[0029] figure 1 It is the SEM image of the sample synthesized in Example 1. It can be seen from the figure that the prepared LiNi 0.5 Mn 1.5 O 4 Under the magnification of 5000 times, the material presents a flake-like microscopic morpholo...

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Abstract

The invention provides a method for preparing a nickel lithium manganate positive pole material with a flaky microstructure. The method includes the steps that a raw material solution is prepared, soluble lithium salt, manganous salt and nickel salt are weighed according to the stoichiometric ratio of LiNi0.5Mn1.5O4 and dissolved in deionized water to form a uniform solution, and the total concentration of metal ions is 0.3-3 M; solution immersion is carried out, filter paper is completely immersed in the solution obtained in the first step, the temperature is controlled to be 30-90 DEG C, immersion time is 0.1-24 hours, and filtering is carried out after immersion; a sample is cured, the filter paper absorbing the raw material solution and obtained in the second step is heated and cured at the temperature of 100-300 DEG C, and a precursor is obtained; the sample is roasted, the nickel lithium manganate positive pole material with the flaky microstructure is obtained through furnace cooling or air cooling after the precursor is roasted at the temperature of 400-900 DEG C. The filter paper serves as a microstructure controlling substance and is automatically removed during roasting, a template is not needed, and the technological process is simple. The obtained LiNi0.5Mn1.5O4 material has the flaky microstructure, a product is small in particle and good in dispersity, the rate capability of the material can be improved, and the specific discharge capacity is high.

Description

technical field [0001] The invention relates to a method for preparing a lithium nickel manganese oxide positive electrode material with a flake-like microscopic appearance, and belongs to the technical field of lithium ion batteries. Background technique [0002] At present, lithium-ion batteries for hybrid electric vehicles and electric vehicles are greatly affected by the energy density and power density of positive electrode materials, LiNi 0.5 Mn 1.5 O 4 With a specific capacity of ~130mAh / g and a high voltage platform of nearly 4.7V, it is a cathode material for lithium-ion batteries with potential applications. However, LiNi 0.5 Mn 1.5 O 4 If the material is to be applied in a high-power lithium-ion battery system, the rate performance still needs to be improved. Preparation of LiNi with special morphology and loose porous structure 0.5 Mn 1.5 O 4 The material can obtain better rate performance. At present, the commonly used preparation of loose porous struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 刘贵阳孙红燕孔馨王宝森刘卫
Owner HONGHE COLLEGE