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Preparation method of lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating

A technology of lithium nickel manganese oxide and cathode materials, which is applied in the field of preparation of cathode materials for lithium-ion batteries, can solve problems such as difficult to precisely control the ratio of elements, unfavorable large-scale industrial production, and complicated preparation processes, so as to improve high-temperature charge and discharge performance, Reduction of phase transition and agglomeration, low transmission energy barrier

Inactive Publication Date: 2019-09-17
启东启澳新材料科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this material is easy to decompose due to the reduction reaction of Ti4+ / Ti3+ in the environment where metal lithium exists.
In addition, due to the complex composition of the material, the preparation process is also relatively complicated, requiring high temperature treatment, it is difficult to precisely control the ratio of each element, and it is not conducive to large-scale industrial production

Method used

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  • Preparation method of lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating
  • Preparation method of lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating
  • Preparation method of lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating

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Embodiment 1

[0034] A preparation method of a conductive strontium titanate coating lithium nickel manganese oxide positive electrode material, comprising the following steps:

[0035] (1) take by weighing strontium hydroxide and tetrabutyl titanate by the molar ratio of 1:1;

[0036] (2) Dissolve strontium hydroxide and tetrabutyl titanate in triethylene glycol, heat to 80°C, and dissolve them fully to obtain a mixed solution A;

[0037] (3) The mass ratio of strontium hydroxide and tetrabutyl titanate total mass to lithium nickel manganese oxide positive electrode material is 10:90 to take lithium nickel manganese oxide positive electrode material;

[0038] (4) Under the condition that the temperature of the mixed solution A is 80°C and the rotational speed of the stirrer is 300r / min, the lithium nickel manganese oxide positive electrode material is added to the mixed solution A while adding 0.5% polyvinylpyrrolidone of triethylene glycol weight, the molecular weight 36000, mechanically...

Embodiment 2

[0043] A preparation method containing conductive strontium titanate coating lithium nickel manganese oxide positive electrode material, comprising the following steps:

[0044] (1) take by weighing strontium hydroxide and tetrabutyl titanate by the molar ratio of 1:1;

[0045] (2) Dissolve strontium hydroxide and tetrabutyl titanate in triethylene glycol, heat to 80°C, and dissolve them fully to obtain a mixed solution A;

[0046] (3) Under the condition that the temperature of the mixed solution A is 80°C and the rotational speed of the stirrer is 300r / min, the lithium nickel manganese oxide positive electrode material is added to the mixed solution A while adding 0.4% polyvinylpyrrolidone of triethylene glycol weight, the molecular weight 50000, mechanically stirred for 30 minutes to obtain mixed suspension B;

[0047](4) at 80 DEG C, under the mechanical stirring condition of 300r / min, add ammoniacal liquor in mixed suspension B, the amount of ammoniacal liquor is 7 times...

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Abstract

The invention discloses a preparation method of a lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating. The preparation method comprises the following steps: weighing strontium salt or strontium hydroxide, titanium salt and a third metal salt according to a molar ratio of 1: 1: X; adding strontium salt or strontium hydroxide, titanium salt and a third metal salt into a certain amount of triethylene glycol, and heating to dissolve to obtain a solution A; weighing a lithium nickel manganese oxide positive electrode material; heating and stirring the mixed solution, adding a lithium nickel manganese oxide positive electrode material into the mixed solution A, adding a suspending agent at the same time, and mechanically stirring to obtain a mixed turbid liquid B; adding a precipitant into the mixed suspension B while stirring; continuously stirring the mixed turbid liquid in the step (5), filtering, washing and drying the mixed turbid liquid to obtain the lithium nickel manganese oxide positive electrode material containing the strontium titanate-based conductive coating. According to the invention, the lithium nickel manganese oxide positive electrode material has better specific discharge capacity, and the discharge capacity of the lithium nickel manganese oxide positive electrode material can be maintained or improved.

Description

technical field [0001] The invention relates to the technical field of preparation of positive electrode materials for lithium ion batteries, in particular to a lithium nickel manganese oxide positive electrode material coated with a strontium titanate-based conductive coating and a preparation method thereof. Background technique [0002] Lithium-ion batteries play an increasingly important role in various fields such as electronic products and electric vehicles. As a positive electrode material, lithium nickel manganese oxide has the advantages of high working voltage (>4.5V), high specific energy, abundant resources, good safety performance, and low environmental pollution due to the absence of cobalt, and has become the most widely used lithium ion at present. One of the battery cathode materials. However, lithium nickel manganese oxide still has some defects, such as poor cycle performance, rate performance and high temperature performance. The existence of these p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/48H01M10/0525H01M2004/028Y02E60/10
Inventor 张菊平
Owner 启东启澳新材料科技发展有限公司
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