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Nanometer fusion lamination modified lithium ion battery positive electrode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems that the ideal coating effect cannot be achieved, the ionic conductivity of the coating layer is not improved much, and the performance improvement of the positive electrode material is limited. Achieve good chemical stability, improve electrochemical performance, and improve the effect of ionic conductivity

Inactive Publication Date: 2015-04-08
HUNAN SHANSHAN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used coating materials are mostly metal or nonmetal oxides, metal fluorides, phosphates, carbon materials and conductive polymers, etc., which can prevent the positive electrode material particles from directly contacting the electrolyte. However, metal or nonmetal Although oxides, fluorides, and phosphates have certain electronic conductivity, they have no ionic conductivity; carbon materials and conductive polymers have good electronic conductivity, but relatively poor ionic conductivity
CN103633312A discloses a surface-modified positive electrode material and method for lithium ion batteries. The electronic conductance of the cladding layer is improved by compound coating metal oxide and carbon material on the surface of the positive electrode material, but the ion conductance of the cladding layer is improved. It is not large, so the improvement of the performance of the positive electrode material is limited
In a word, the coating of the above substances cannot achieve the ideal coating effect.

Method used

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  • Nanometer fusion lamination modified lithium ion battery positive electrode material and preparation method thereof
  • Nanometer fusion lamination modified lithium ion battery positive electrode material and preparation method thereof
  • Nanometer fusion lamination modified lithium ion battery positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Composition of nano-melt composite coating modified lithium-ion battery cathode material:

[0036] Positive electrode active material matrix: LiCoO 2 , content 99 wt%, nano oxide: La 2 o 3 (particle size 50nm), content 0.2 wt%, Li 2 TiO 3 , content 0.8 wt%.

[0037] Preparation:

[0038] (1) Dissolve 3.06 mL tetraethyl titanate (0.0145 mol) in 90 mL absolute ethanol, stir and add glacial acetic acid to pH=6 to obtain a uniform colloidal solution;

[0039] (2) Add 1.5 mL of n-butylamine to the colloidal solution obtained in step (1), then add 1.93 g of anhydrous lithium acetate (0.029 mol), and stir to obtain a solution containing 1.6 g of Li 2 TiO 3 coating solution;

[0040] (3) Slowly add 0.4 g of nano-oxide La to the coating solution obtained in step (2) 2 o 3 and 198 g of cathode material LiCoO 2 , and added 100 g of ethanol, heated and stirred at 60 °C, when the solution lost fluidity, a sol was obtained;

[0041] (4) Dry the sol obtained in step (3...

Embodiment 2

[0045] Composition of nano-melt composite coating modified lithium-ion battery cathode material:

[0046] Positive active material matrix: Li(Mn 1 / 3 Ni 1 / 3 co 1 / 3 )O 2 , content 98.5 wt%, nano oxide: MgO (particle size 30nm), content 0.3 wt%, Li 2 TiO 3 , content 1.2 wt%.

[0047] Preparation:

[0048] (1) Dissolve 6.5 mL of titanium isopropoxide (0.0219mol) in 180 mL of absolute ethanol, stir and add glacial acetic acid to pH=5.5 to obtain a uniform colloidal solution;

[0049] (2) Add 3 mL of hexamethylenediamine to the colloidal solution obtained in step (1), then add 2.89 g of anhydrous lithium acetate (0.0438 mol) and stir to obtain a solution containing 2.4 g of Li 2 TiO 3 coating solution;

[0050] (3) Slowly add 0.6 g of nano-oxide MgO and 197 g of cathode material Li(Mn 1 / 3 Ni 1 / 3 co 1 / 3 )O 2 , heating and stirring at 70 °C, when the solution loses fluidity, a sol is obtained;

[0051] (4) Dry the sol obtained in step (3) in an oven at 110 °C for 11 ...

Embodiment 3

[0055] Composition of nano-melt composite coating modified lithium-ion battery cathode material:

[0056] Positive active material matrix: Li 1.2 (Mn 0.56 Ni 0.16 co 0.08 )O 2 (The expression can also be written as 0.6Li[Li 1 / 3 mn 2 / 3 ]O 2 0.4Li[Ni 0.4 mn 0.4 co 0.2 ]O 2 ), content 98 wt%, nano oxide: Al 2 o 3 (particle size 30 nm), content 0.4 wt%, Li 2 TiO 3 , content 1.6 wt%.

[0057] Preparation:

[0058] (1) Dissolve 10.3 mL tetrabutyl titanate (0.029 mol) in 257.5 mL absolute ethanol, stir and add glacial acetic acid to pH=5 to obtain a uniform colloidal solution;

[0059] (2) Add 5 mL of dodecylamine to the colloidal solution obtained in step (1), then add 3.85 g of anhydrous lithium acetate (0.058 mol), and stir to obtain a solution containing 3.2 g of Li 2 TiO 3 coating solution;

[0060] (3) Slowly add 0.8 g nano-oxide Al to the coating solution obtained in step (2) 2 o 3 and 196 g of cathode material Li 1.2 (Mn 0.56 Ni 0.16 co 0.08 )O 2...

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Abstract

The invention relates to a nanometer fusion lamination modified lithium ion battery positive electrode material and a preparation method thereof. The nanometer fusion lamination modified lithium ion battery positive electrode material consists of a positive electrode active material base body and a nanometer oxide and Li2TiO2 compound layer wrapping the surface of the base body. The preparation method comprises the following steps: (1) dissolving a titanium source in absolute ethyl alcohol, adding an inhibiting agent to obtain a colloidal solution; (2) adding a template agent in the colloidal solution, then adding lithium acetate to obtain a wrapping solution; (3) slowly adding a nanometer oxide and a positive electrode material in the wrapping solution, heating and mixing to obtain sol; and (4) drying the sol to obtain a wrapping precursor; and (5) grinding the wrapping precursor and then keeping the ground wrapping precursor at the temperature of 500-600 DEG C for 5-8h to obtain the nanometer fusion lamination modified lithium ion battery positive electrode material. According to the nanometer fusion lamination modified lithium ion battery positive electrode material modified in accordance with the method provided by the invention, the stability and the safety of the nanometer fusion lamination modified lithium ion battery positive electrode material can be effectively improved, and the ion conductance and the electronic conductance of the surface of the positive electrode material are improved.

Description

Technical field [0001] The invention involves the surface modified material and its preparation methods of a lithium -ion battery positive material, which specializes in a nano melting composite lithium -ion battery orthopedic material and its preparation methods. Background technique [0002] Lithium -ion batteries have been widely used in electronic products such as mobile phones, mobile phones, cameras, laptops and computers due to the advantages of high energy density, light weight, no memory effect, and long cycle life.The ideal energy of power electric vehicles, so it is urgent to develop lithium -ion batteries with high energy density, high power density, and high safety. [0003] The performance of lithium -ion batteries largely depends on the performance of the positive electrode materials to a large extent. In practical applications, due to the high potential of the positive electrode material of the lithium ion battery, and the lithium -state positive material has stro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/505H01M4/131H01M4/62
CPCH01M4/1391H01M4/505H01M4/525H01M4/62H01M4/624H01M4/628Y02E60/10
Inventor 李艳袁荣忠谭欣欣李旭蒋湘康
Owner HUNAN SHANSHAN NEW ENERGY CO LTD
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