Preparation method of nanometer lithium lanthanum titanate coated 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2 material

A nano-titanium, lithium-coated technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low coulombic efficiency, poor rate performance, capacity decay, etc. Effects of Coulombic Efficiency

Inactive Publication Date: 2016-10-12
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

[0004] However, people have also found in the research that although LNMO has a high discharge specific capacity and energy density, it also has problems such as low initial Coulombic efficiency, poor rate performance, and capacity fading. Therefore, it is necessary to modify the surface of this type of material. To meet the requirements of electric vehicles for high rate, high energy density and long life of lithium-ion batteries
[0005] In order to overcome the problems of poor rate performance and capacity fading in the application of lithium-rich manganese-rich solid solution battery materials, the current solution to the above problems in the industry is mainly through material body doping or / and surface coating, while the surface The type of coating material is closely related to the performance of the battery material

Method used

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  • Preparation method of nanometer lithium lanthanum titanate coated 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2 material
  • Preparation method of nanometer lithium lanthanum titanate coated 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2 material
  • Preparation method of nanometer lithium lanthanum titanate coated 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2 material

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Experimental program
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Effect test

Embodiment 1

[0031] A kind of 0.5Li coated with nanometer lanthanum lithium titanate 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The preparation method of material comprises the following steps:

[0032] (1) Co-precipitation method to prepare nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4

[0033]Prepare a mixed aqueous solution of nickel nitrate and manganese nitrate at a molar ratio of Ni:Mn=1:3, add 2M NaOH solution dropwise to the mixed aqueous solution under stirring, and control the pH value of the mixed solution at 10.5 to ensure that Ni 2 +, Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain the precursor Ni 0.5 mn 1.5 (OH) 4 ;

[0034] (2) Nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4 Preprocessing:

[0035] According to the molar ratio Li: Ni: Mn = 4.1: 1: 3 lithium carbonate, precursor Ni 0.5 mn 1.5 (OH) 4 Mix to obtain a solid mixture, in which a slight excess of Li is to ...

Embodiment 2

[0046] A kind of 0.5Li coated with nanometer lanthanum lithium titanate 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The preparation method of material comprises the following steps:

[0047] (1) Preparation of nickel-manganese precursor Ni by co-precipitation 0.5 mn 1.5 (OH) 4

[0048] Prepare a mixed aqueous solution of nickel nitrate and nickel acetate (the ratio of the two substances is 1:1) and manganese sulfate according to the molar ratio Ni:Mn=1:3, and add molar solution dropwise to the mixed aqueous solution under vigorous stirring. KOH solution with a concentration of 2M, the pH value of the mixed solution is controlled at about 10 to ensure that the Ni 2+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain the precursor Ni 0.5 mn 1.5 (OH) 4 ;

[0049] (2) Nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4 preprocessing

[0050] With step 1) gained precursor Ni 0.5 mn ...

Embodiment 3

[0058] A kind of 0.5Li coated on the surface of nanometer lanthanum lithium titanate 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The preparation method of material comprises the following steps:

[0059](1) Preparation of nickel-manganese precursor Ni by co-precipitation 0.5 mn 1.5 (OH) 4

[0060] Prepare a mixed aqueous solution of nickel sulfate, manganese chloride and manganese sulfate (the ratio of the two substances is 1:1) according to the amount ratio of Ni:Mn=1:3, and add it dropwise to the mixed solution under stirring LiOH solution with a molar concentration of 2M, the pH of the mixed solution was controlled at 10.1 to ensure that the Ni 2+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 110°C for 12 hours to obtain the precursor Ni 0.5 mn 1.5 (OH) 4 ;

[0061] (2) Nickel-manganese precursor Ni 0.5 mn 1.5 (OH) 4 For pretreatment, lithium acetate and precursor Ni 0.5 mn 1.5 (OH) 4 Mix the ...

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Abstract

The invention provides a preparation method of a nanometer lithium lanthanum titanate coated 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2 material. Compared with the prior art, the method has the advantages that the lithium lanthanum titanate is a very good lithium conductor, is applicable to fast migration of lithium ions, and achieves the effect of improving the material rate capability; meanwhile, due to the surface coating, the protection effect is achieved on the body material; the contact between the material and electrolyte can be reduced; the occurrence of side reaction can be reduced; the manganese ion dissolution separation due to corrosion of HF on the material per se is reduced; the coulombic efficiency and the circulation stability are improved. By controlling the preparation process parameters, the 0.5Li2MnO3 0.5LiNi0.5Mn0.5O2 material with good performance is obtained through preparation; then, the material is subjected to uniform nanometer lithium lanthanum titanate surface coating, so that the first-time coulombic efficiency, the rate capability and the circulation stability are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to the modification research of lithium-ion battery cathode materials, in particular to 0.5Li coated with nano-lanthanum lithium titanate 2 MnO 3 0.5LiNi 0.5 mn 0.5 o 2 The method of preparation of the material. Background technique [0002] Lithium-ion battery positive electrode materials with application prospects in the field of electric vehicles mainly include lithium iron phosphate and lithium manganate. Although lithium iron phosphate with an olivine structure has low cost and good rate performance, its industrialization level and application prospects are limited due to its low energy density (generally less than 120Wh / Kg), poor processing consistency, and poor low-temperature performance. ; In addition, lithium manganate with a spinel structure has the advantages of a three-dimensional deintercalation channel structure that is very suitable for lithium ions ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王秀田海滨杨玉梅朱广燕赵志刚
Owner CHERY AUTOMOBILE CO LTD
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