Modified spinel lithium manganate material and preparation method thereof

A spinel lithium manganate, modification technology, applied in the direction of manganate/permanganate, nanotechnology for materials and surface science, electrical components, etc., can solve the problem of inability to guarantee cycle performance and hinder marketization Application, limited cobalt resources and other issues, to achieve the effects of reducing production costs, inhibiting the John-Teller effect, improving cycle performance and high temperature performance

Inactive Publication Date: 2012-10-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The performance of lithium-ion batteries depends on the performance of the cathode material, and the current commercial cathode material is mainly LiCO 2 , but due to limited cobalt resources, its production cost is high, which limits its large-scale application, and the cobalt element is toxic; while spinel lithium manganate has the characteristics of simple preparation process, low cost, low toxicity, and high safety. It is one of the most promising cathode materials for lithium-ion batteries
[0004] Although spinel-type lithium manganate has the above advantages, its low specific capacity and poor cycle performance, especially its poor high temperature performance, hinder its normal market application.
In order to solve the above problems, doping or coating methods are generally used to solve the above problems, but only one aspect can be used to improve its performance. The cycle performance is guaranteed but the capacity is reduced or the capacity is increased but the cycle performance cannot be guaranteed.

Method used

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  • Modified spinel lithium manganate material and preparation method thereof
  • Modified spinel lithium manganate material and preparation method thereof
  • Modified spinel lithium manganate material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Using Al, Zn compound doping, its chemical formula is: Li 1.03 al 0.03 Zn 0.03 mn 1.91 o 4 .

[0027] (1) Preparation of xerogel: LiNO 3 , Mn(CH 3 COO) 2 4H 2 O, Al(NO 3 ) 3 9H 2 O, Zn(NO 3 ) 2 ·6H 2 O was weighed according to the molar ratio of Li:Mn:Al:Zn of 1.03:1.91:0.03:0.03, ground in a mortar and mixed evenly, dissolved in deionized water at about 1g / mL, and mixed evenly , add citric acid in an amount equal to the sum of the molar amounts of all metal ions, mix and stir evenly, adjust the pH value to 8 with concentrated ammonia water with a mass fraction of 24%, and heat and stir in a water bath at 80°C to evaporate to obtain a light pink wet gel; Dry the wet gel at 120°C for 12 hours to obtain a dry gel;

[0028] (2) Burning: Take the dry gel prepared in step (1) and place it at 480°C for pre-burning treatment for 6 hours, cool it down to room temperature naturally, grind it, and pass it through a 200-mesh sieve; put the ground dry gel at 600°C fo...

Embodiment 2

[0031] Using Zn, Mg composite doping, its chemical formula is: Li 1.03 Zn 0.03 Mg 0.03 mn 1.91 o 4 .

[0032] (1) Preparation of xerogel: LiNO 3 , Mn(CH 3 COO) 2 4H 2 O, Zn(NO 3 ) 2 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O was weighed according to the ratio of Li:Mn:Zn:Mg molar ratio of 1.03:1.91:0.03:0.03, ground in a mortar and mixed evenly, dissolved in deionized water at about 1g / mL, and mixed evenly , add citric acid in an amount equal to the sum of the molar amounts of all metal ions, mix and stir evenly, adjust the pH value to 8 with concentrated ammonia water with a mass fraction of 25%, heat and stir in a water bath at 90°C to evaporate, and obtain a light pink wet gel; Dry the wet gel at 130°C for 10-14 hours to obtain a dry gel;

[0033] (2) Burning: Take the dry gel prepared in step (1) and place it at 490°C for pre-burning treatment for 8 hours, cool it down to room temperature naturally, grind it, and pass it through a 220-mesh sieve; place the ground dry gel at...

Embodiment 3

[0036] Using Al, Mg compound doping, its chemical formula is: Li 1.03 al 0.03 Mg 0.03 mn 1.91 o 4 ,

[0037] (1) Preparation of xerogel: LiNO 3 , Mn(CH 3 COO) 2 4H 2 O, Al(NO 3 ) 3 9H 2 O, Mg(NO 3 ) 2 ·6H 2 O is weighed according to the molar ratio of Li:Mn:Al:Mg of 1.03:1.91:0.03:0.03, ground in a mortar and mixed evenly, dissolved in deionized water at about 1g / mL, and mixed evenly , adding citric acid in an amount equal to the sum of the molar amounts of all metal ions, mixing and stirring evenly, adjusting the pH value to 6 with concentrated ammonia water with a mass fraction of 22%, heating and stirring in a water bath at 70°C for evaporation, and obtaining a light pink wet gel; Dry the wet gel at 110°C for 10 hours to obtain a dry gel;

[0038] (2) Burning: Take the dry gel prepared in step (1) and place it at 470°C for pre-burning treatment for 4 hours, cool it down to room temperature naturally, grind it, and pass it through a 180-mesh sieve; put the gro...

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Abstract

The present invention relates to a modified nanometer spinel lithium manganate material and a preparation method thereof, specifically to a method for carrying out composite doping modification on spinel by adopting a plurality of metals selected from Mg, Zn, Al and other metals according to a certain combination of the metals, and belongs to the technical field of lithium batteries. According to the present invention, a lithium source, a manganese source, and an acetate or a nitrate of a metal M are grinded and uniformly mixed in a mortar according to a certain molar ratio; deionized water and citric acid are added; concentrated ammonia water is adopted to adjust the pH value; a heating evaporation treatment is performed to obtain a wet gel; the wet gel is dried to obtain a dry gel; and the dry gel is subjected to ignition grinding twice to obtain the product, wherein the product is the modified spinel lithium manganate material. The preparation method of the present invention belongs to the nanometer range, such that the prepared material has high discharge capacity and good rate performance. With the composite doping, cycle performance and high temperature performance of the material can be improved, such that the important practical application significance is provided.

Description

technical field [0001] The invention relates to a nano-scale modified spinel-type lithium manganese oxide material and a preparation method thereof, in particular to compound doping and modification of spinel by several kinds of metals such as Mg, Zn and Al according to a certain combination, belonging to Lithium battery technology field. Background technique [0002] Nanotechnology provides novel synthesis methods for battery materials, and the outstanding representative is the preparation and application of nanometer electrode materials. Nanomaterials refer to related materials whose size is within 1~100nm in at least one direction. Surface effects, quantum size effects, small size effects, and macroscopic quantum tunneling effects are the basic properties of nanomaterials, which make nanomaterials different from bulk materials in terms of electricity, light, chemistry, magnetism, and heat. The use of nanotechnology can greatly increase the discharge capacity of the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01M4/505B82Y30/00
CPCY02E60/122Y02E60/10
Inventor 张海朗叶兰
Owner JIANGNAN UNIV
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