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Nickel-manganese-titanium composite material and preparation method and application thereof

A composite material, nickel-manganese technology, applied in the direction of active material electrodes, electrical components, electrochemical generators, etc., can solve the problems of positive electrode material capacity and poor cycle stability, and achieve high structural stability, electrochemical performance, and cycle performance Good, easy-to-deform effect

Active Publication Date: 2021-06-08
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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  • Nickel-manganese-titanium composite material and preparation method and application thereof
  • Nickel-manganese-titanium composite material and preparation method and application thereof
  • Nickel-manganese-titanium composite material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] S1, by the mol ratio of Ni:Mn be 83:17 to take nickel sulfate and manganese sulfate to be made into the mixed solution of 1mol / L, the ammonia solution (complexing agent) of this mixed solution and 2mol / L, 2mol / L Aqueous sodium hydroxide solution (precipitating agent) was added into the reaction kettle, and left to stand for an aging reaction 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 2mol / L ammonia solution and continue to stir for 30min, then slowly add 1mol / L tetrabutyl titanate solution and 2mol / L sodium hydroxide solution at a temperature of Standing and aging for 3 hours at 60°C and pH 11.5, primary titanium-doped nickel-manganese precipitates were obtained, in which the molar ratio of titanium ions and nickel-manganese mixed ions added this time was 1:20.

[0062] S3, place the primary titanium-doped n...

Embodiment 2

[0067] S1, be 84:16 by the mol ratio of Ni:Mn and take nickel sulfate and manganese sulfate to be made into the mixed solution of 1mol / L, this mixed solution and the ammoniacal solution (complexing agent) of 1.5mol / L, 2mol / L The aqueous sodium hydroxide solution (precipitating agent) was added into the reaction kettle, and left to stand for aging reaction 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, the nickel-manganese hydroxide precursor is placed in the ammonia solution of 1.5mol / L and continue to stir for 30min, then slowly add the isobutyl titanate solution of 1mol / L and the sodium hydroxide solution of 2mol / L, at temperature Standing and aging for 4 hours at 50°C and a pH value of 11.5, a primary titanium-doped nickel-manganese precipitate was obtained, wherein the molar ratio of titanium ions and nickel-manganese mixed ions added this time was 6:70.

[0069]...

Embodiment 3

[0074] S1, according to the molar ratio of Ni:Mn be 80:20 to take by weighing nickel sulfate and manganese sulfate to be made into the mixed solution of 1.3mol / L, the ammonia solution (complexing agent) of this mixed solution and 1.5mol / L, 2mol / L L of potassium hydroxide aqueous solution (precipitating agent) was added into the reaction kettle, and left to age 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, the nickel manganese hydroxide precursor is placed in the aqueous ammonia solution of 1.5mol / L and continue to stir for 30min, then add the tetrabutyl titanate solution of 1.3mol / L and the potassium hydroxide aqueous solution of 2mol / L, at temperature After static aging at 55°C and pH 11.5 for 3.8 hours, a primary titanium-doped nickel-manganese precipitate was obtained, in which the molar ratio of titanium ions and nickel-manganese mixed ions added this time was 1...

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a nickel-manganese-titanium composite material and a preparation method and application thereof. The nickel-manganese-titanium composite material comprises an inner core and a coating layer coating the surface of the inner core, wherein the inner core is composed of nickel-manganese-titanium oxide, nickel, manganese and titanium are distributed in the inner core in a gradient mode, the content of nickel and manganese is gradually reduced from inside to outside in the radial direction of the inner core, the content of titanium is gradually increased from inside to outside in the radial direction of the inner core, and the component of the coating layer is lithium titanate. A lithium ion battery corresponding to the nickel-manganese-titanium composite material provided by the invention has relatively high capacity and cycling 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. Compared with traditional LiCoO 2 , LiNiO 2 and LiMnO 2 In comparison, 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 weaken, resulting in a large capacity decay of the cathode material as the cycle progresses. [0003] The role of cobalt in ternary cathode materials is crucial, Co 3+ The magnetic moment is 0, and occupying the transition metal p...

Claims

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Application Information

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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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