Dual-layer composite structured ternary positive electrode material and preparation method therefor

A cathode material, double-layer composite technology, applied in structural parts, nanotechnology for materials and surface science, electrical components, etc., can solve the problems of ternary cathode material cycle performance and safety performance that cannot meet market demand, etc. Improve safety stability and cycle stability, reduce reactivity, and alleviate the effect of particle breakage

Active Publication Date: 2017-09-01
SHANDONG YUHUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to make up for the deficiencies of the existing technology and to solve the problem that the cycle performance and safety performance of the ternary cathode material prepared by the existing preparation method cannot meet the market demand, the present invention provides a double-layer composite structure ternary cathode material and its preparation method

Method used

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  • Dual-layer composite structured ternary positive electrode material and preparation method therefor
  • Dual-layer composite structured ternary positive electrode material and preparation method therefor
  • Dual-layer composite structured ternary positive electrode material and preparation method therefor

Examples

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Embodiment 1

[0033] A preparation method for a double-layer composite structure ternary positive electrode material, comprising the steps of:

[0034] 1) Synthetic inner structure

[0035] a) Prepare nickel-cobalt-manganese salt solution: accurately weigh nickel salt, cobalt salt, and manganese salt according to the molar ratio of 5:2:3, dissolve them in deionized water, and pass nitrogen to remove oxygen to obtain 6L 2 mol / L nickel-cobalt-manganese salt solution ;

[0036] b) Prepare 0.5L complexing agent solution A, 1L complexing agent solution B and 6L precipitant solution, and pass nitrogen to remove oxygen; complexing agent solution A is 0.3 mol / L ammonia solution; complexing agent solution B is 4mol The ammonia solution of / L; Precipitant solution is the sodium hydroxide aqueous solution of 4mol / L;

[0037] c) Add 0.5L of complexing agent solution A in step 1)b as the bottom liquid to the reaction kettle, pass inert gas nitrogen into the reaction kettle, then stir at a stirring spe...

Embodiment 2

[0046] A preparation method for a double-layer composite structure ternary positive electrode material, comprising the steps of:

[0047] 1) Synthetic inner structure

[0048] a) Prepare nickel-cobalt-manganese salt solution: accurately weigh nickel salt, cobalt salt, and manganese salt according to the molar ratio of 8:1:1, dissolve them in deionized water, and pass nitrogen to remove oxygen to obtain 40L 2mol / L nickel-cobalt-manganese salt solution;

[0049] b) Prepare 20L of complexing agent solution A, 12L of complexing agent solution B and 40L of precipitating agent solution, and pass nitrogen to remove oxygen; complexing agent solution A is 0.5 mol / L ammonia solution; complexing agent solution B is 4mol / L The ammonia solution of L; Precipitant solution is the sodium hydroxide aqueous solution of 4mol / L;

[0050] c) Add 20L of complexing agent solution A in step 1)b as the bottom liquid to the reactor, feed the inert gas nitrogen into the reactor, then stir at a stirring...

Embodiment 3

[0059] Change the stirring speed in step 1) c in Example 1 to 700r / min, and the others are consistent with Example 1.

[0060] The double-layer composite structure ternary positive electrode material obtained in this example was used as the positive electrode material to prepare a button battery, and its electrochemical performance was tested. The results are shown in Table 1.

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Abstract

The invention discloses a dual-layer composite structured ternary positive electrode material and a preparation method therefor, and belongs to the technical field of a positive electrode material of a lithium ion battery. The molecular formula of the positive electrode material is LiNi<x>Co<1-x-y>Mn<y>O<2>, wherein x is greater than 0 and less than 1, y is greater than 0 and less than 1, and x+y is less than 1; the positive electrode material adopts a dual-layer structure; an inner layer adopts a loosened porous structure formed by nano-scale granules through aggregation; and an outer layer adopts a structure which is formed by micron-scale granules in radiative directional arrangement and accumulation and surrounds the inner layer. By controlling a material precursor synthesis process, a precursor material with a dual-layer composite material is prepared; and through sintering, the dual-layer composite structured positive electrode material is prepared. The positive electrode material prepared by the method is high in cycling stability and high in safety; the cycle retention rate is greater than 95% when a half battery is subjected to 100 cycles at 1C; and the cycle life of a full battery is more than 2,000 times at 1C.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a double-layer composite structure ternary cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of secondary battery. Due to its obvious advantages such as high specific energy, long cycle life, good discharge stability, low environmental pollution and great development potential, it has become a new model for the development and development of the global energy industry. focus direction. Cathode materials play a pivotal role in lithium-ion batteries. Therefore, the development and utilization of cathode materials is particularly rapid. Ternary cathode materials have become the potential of many cathode materials due to their high energy density, relatively low cost and excellent cycle performance. The largest and most promising one is favored by people and widely used in consumer product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 赵洪东张会斌牛龙伟王瑛赵成龙于文倩
Owner SHANDONG YUHUANG NEW ENERGY TECH
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