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A kind of nickel-manganese-titanium composite material and its preparation method and application

A composite material, nickel-manganese technology, used in positive electrodes, active material electrodes, structural parts, etc., can solve the problems of poor cathode material capacity and cycle stability, achieve high structural stability and electrochemical performance, and improve electrochemical cycles. The effect of performance and appearance is easy

Active Publication Date: 2022-06-17
XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to overcome existing layered LiNi x mn (1-x) o 2 The capacity of the positive electrode material and the defects of poor cycle stability provide a nickel-manganese-titanium composite material with high capacity and cycle stability and its preparation method and application

Method used

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  • A kind of nickel-manganese-titanium composite material and its preparation method and application
  • A kind of nickel-manganese-titanium composite material and its preparation method and application
  • A kind of nickel-manganese-titanium composite material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] S1, be 83:17 by the mol ratio of Ni:Mn to take by weighing nickel sulfate and manganese sulfate and be made into the mixed solution of 1mol / L, this mixed solution and the ammonia solution (complexing agent) of 2mol / L, the mixed solution of 2mol / L Aqueous sodium hydroxide solution (precipitating agent) was added to the reaction kettle, and the reaction was allowed to stand for 4 hours under the conditions of a water bath temperature of 55°C and a pH value of 11.00, to obtain a nickel-manganese hydroxide precursor.

[0061] S2, place the nickel-manganese hydroxide precursor in a 2mol / L ammonia solution and continue stirring for 30min, then slowly add a 1mol / L tetrabutyl titanate solution and a 2mol / L sodium hydroxide solution, at a temperature of The primary titanium-doped nickel-manganese precipitate was obtained by standing at 60 °C and a pH value of 11.5 for an aging reaction for 3 hours, wherein the molar ratio of titanium ions and nickel-manganese mixed ions added thi...

Embodiment 2

[0067] S1, be 84:16 by the molar ratio of Ni:Mn to take by weighing nickel sulfate and manganese sulfate and be made into the mixed solution of 1mol / L, this mixed solution and the ammonia solution (complexing agent) of 1.5mol / L, 2mol / L The sodium hydroxide aqueous solution (precipitant) was added to the reaction kettle, and the reaction was allowed to stand for 5 hours under the conditions of a water bath temperature of 55 °C and a pH value of 11.00 to obtain a nickel-manganese hydroxide precursor.

[0068] S2. Place the nickel-manganese hydroxide precursor in a 1.5 mol / L ammonia solution and continue stirring for 30 min, and then slowly add a 1 mol / L isobutyl titanate solution and a 2 mol / L sodium hydroxide solution. The reaction was allowed to stand for 4 hours at 50°C and pH 11.5 to obtain primary titanium-doped nickel-manganese precipitates, wherein the molar ratio of titanium ions and nickel-manganese mixed ions added this time was 6:70.

[0069] S3. Place the primary tit...

Embodiment 3

[0074] S1, be 80:20 by the molar ratio of Ni:Mn to take by weighing nickel sulfate and manganese sulfate and be made into the mixed solution of 1.3mol / L, this mixed solution and the ammonia solution (complexing agent) of 1.5mol / L, 2mol / L L potassium hydroxide aqueous solution (precipitating agent) was added to the reaction kettle, and the reaction was allowed to stand for 3.6 hours under the conditions of a water bath temperature of 55 °C and a pH value of 11.00 to obtain a nickel-manganese hydroxide precursor.

[0075] S2, place the nickel-manganese hydroxide precursor in a 1.5 mol / L ammonia solution and continue stirring for 30 min, then add a 1.3 mol / L tetrabutyl titanate solution and a 2 mol / L potassium hydroxide aqueous solution. For 3.8 hours of standing at 55°C and pH value of 11.5 for aging reaction, primary titanium-doped nickel-manganese precipitates were obtained, wherein the molar ratio of titanium ions and nickel-manganese mixed ions added this time was 1:15.

[0...

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Abstract

The invention belongs to the field of lithium ion batteries, and in particular relates to a nickel-manganese-titanium composite material and a preparation method and application thereof. The nickel-manganese-titanium composite material includes an inner core and a cladding layer covering the surface of the inner core. The inner core is composed of nickel-manganese-titanium oxide, and the three elements of nickel, manganese and titanium are distributed in a gradient in the inner core. The content of manganese and manganese gradually decreases from the inside to the outside along the radial direction of the core, and the content of titanium gradually increases from the inside to the outside along the radial direction of the core, and the composition of the cladding layer is lithium titanate. The lithium-ion battery corresponding to the nickel-manganese-titanium composite material provided by the invention has higher capacity and cycle stability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a nickel-manganese-titanium composite material and a preparation method and application thereof. Background technique [0002] Layered nickel-cobalt-manganese cathode material is a promising material. with traditional LiCoO 2 , LiNiO 2 and LiMnO 2 In contrast, layered nickel-cobalt-manganese cathode materials have the advantages of high specific capacity, high energy density, and environmental friendliness, and gradually occupy an important position in the lithium-ion battery market. However, as the nickel content increases, the structural stability and thermal stability of the nickel-cobalt-manganese cathode material will become weaker, resulting in a large capacity attenuation of the cathode material with the progress of the cycle. [0003] The role of cobalt in ternary cathode materials is crucial, Co 3+ The magnetic moment is 0, occupying the transition m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/366H01M4/505H01M4/525H01M4/485H01M10/0525H01M2004/028Y02E60/10
Inventor 姜龙叶耀滨王泰淦王静任魏国祯
Owner XTC NEW ENERGY MATERIALS(XIAMEN) LTD
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