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A multistage layer-coated ternary cathode material for A lithium ion batterY, a preparation method thereof and a lithium ion battery

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of poor uniformity of active material coating, reduced material cycle stability, and limited effect, so as to improve thermal efficiency. Stability and cycle life, simple preparation method, effect of inhibiting reaction

Active Publication Date: 2019-01-18
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, spray drying technology is used to prepare coated positive electrode materials, the effect is limited by the technology itself, and the uniformity of active material coating is not good
However, the method of suction filtration and drying after wet coating is adopted, but this method will cause the material to lose more lithium elements and reduce the cycle stability of the material.

Method used

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  • A multistage layer-coated ternary cathode material for A lithium ion batterY, a preparation method thereof and a lithium ion battery
  • A multistage layer-coated ternary cathode material for A lithium ion batterY, a preparation method thereof and a lithium ion battery
  • A multistage layer-coated ternary cathode material for A lithium ion batterY, a preparation method thereof and a lithium ion battery

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preparation example Construction

[0052] The present invention also provides a method for preparing the above-mentioned ternary positive electrode material, comprising the following steps:

[0053] A) preparing an aqueous solution of a soluble first metal-coated element salt to obtain a first coating solution;

[0054] preparing a salt solution of a soluble second metal coating element to obtain a second coating solution;

[0055] preparing an aqueous solution of a soluble phosphoric acid compound to obtain a third coating solution;

[0056] B) dispersing the ternary cathode material substrate in deionized water to obtain a suspension;

[0057] Under alkaline conditions, dropwise adding the first coating solution to the suspension for reaction to obtain a reaction product;

[0058] Drying the reaction product and performing heat treatment to obtain an intermediate reaction product;

[0059] C) dispersing the intermediate reaction product in deionized water to obtain a suspension;

[0060] Under alkaline co...

Embodiment 1

[0098] 1.1 Dissolve 20g of aluminum nitrate nonahydrate in 80ml of deionized water to obtain coating solution 1;

[0099] 1.2 Add 1Kg Ni 0.6 co 0.2 mn 0.2 o 2 The ternary positive electrode material is dispersed in 1000ml of deionized water to form a suspension 1, 1 drop of the coating solution obtained in step (1) is added to the suspension 1, and 2mol / L lithium hydroxide solution is added to control the pH of the reaction system=7.5, React for 2 hours, then suction filter, wash, dry, and heat-treat at 350°C for 6 hours at a heating rate of 3°C / min to obtain an intermediate reactant;

[0100] 1.3 Dissolve 5g of aluminum nitrate nonahydrate in 80ml of deionized water to obtain coating solution 2; dissolve 1.7g of diammonium hydrogen phosphate in 80ml of deionized water to obtain coating solution 3;

[0101] 1.4 Disperse the intermediate reactants obtained in step 2 in 1000ml deionized water to form suspension 2, add coating solution 2 and coating solution 3 obtained in ste...

Embodiment 2

[0105] 2.1 Dissolve 18g of magnesium sulfate heptahydrate in 80ml of deionized water to obtain coating solution 1;

[0106] 2.2 Put 1Kg Ni 0.5 co 0.2 mn 0.3 o 2 The ternary positive electrode material is dispersed in 1000ml of deionized water to form a suspension 1, 1 drop of the coating solution obtained in step (1) is added to the suspension 1, and 2mol / L lithium hydroxide solution is added to control the pH of the reaction system=10.0, React for 3 hours, then suction filter, wash and dry, and heat-treat at 400°C for 6 hours at a heating rate of 4°C / min to obtain the intermediate reactant;

[0107] 2.3 Dissolve 7.5g of lanthanum nitrate hexahydrate in 80ml of deionized water to obtain coating solution 2; dissolve 3.52g of ammonium phosphate in 80ml of deionized water to obtain coating solution 3;

[0108] 2.4 Disperse the intermediate reactants obtained in step 2 in 1000ml deionized water to form suspension 2, add coating solution 2 and coating solution 3 obtained in ste...

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Abstract

The invention provides a multistage layer-coated ternary cathode material for a lithium ion battery, which comprises a ternary cathode material and a multilayer cladding layer coated on the surface ofthe ternary cathode material; A metal oxide layer, a transition layer formed by a metal oxide and a metal phosphate salt, and a metal phosphate layer are sequentially arranged from that inside to theoutside of the multilayer cladding layer, wherein the metal oxide layer and / or the transition layer further comprises a lithium metal oxide of a fast ion conductor, and the transition layer and / or the metal phosphate salt layer further comprises lithium phosphate. A ternary cathode material coated with a plurality of layers is formed by multi-stage coating, thereby realizing the effect of inhibiting the reaction between the surface of the cathode material and the electrolyte, and improving the thermal stability and cycle life of the material through the synergistic effect of different types of surface coatings; While increasing the safety of lithium ion batteries. In addition, the preparation method provided by the invention is simple, can be prepared by using the existing equipment, andsaves the production cost.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a multi-level layer-coated lithium ion battery ternary cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] When the voltage is higher than 4.4V, the electrochemical performance of lithium-rich nickel-based materials will deteriorate, mainly in the following aspects: 1) During the electrochemical reaction, side reactions will occur between the active material and the electrolyte, resulting in the circulation of the material The stability becomes poor. 2) The phase transformation of the active material occurs, resulting in NiO phase, which is not conducive to the electrochemical performance of the material. 3) The corrosion side reaction occurs on the electrode surface, which will produce a chain reaction and threaten the safety of the battery. [0003] Doping and coating metal oxides or metal phosphates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 朱永波佘圣贤袁徐俊任万里黄连友戚洪亮
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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