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Lithium-ion battery precursor material, composite positive electrode material and preparation method thereof

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability, battery safety, explosion, etc., achieve high-voltage cycle stable electrochemical performance, and improve processing performance And the effect of excellent storage performance and physical performance

Inactive Publication Date: 2015-10-07
GUANGZHOU LIBODE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Third, the surface Li 2 CO 3 The presence of LiOH and LiOH will cause battery safety issues. At high temperatures, LiOH and LiOH 2 CO 3 will decompose to release H 2 , CO and CO 2 and other gases, causing the battery to swell or even explode
But this method has following problems: 1, the 5%wt~15%wt sodium hydroxide solution aging treatment of CN103553152A is beneficial to the removal of sulfur, but often can cause the loss of surface aluminum element in washing process, causes final prepared The lack of aluminum on the surface of the material reduces the cycle stability of the material; 2. The active nickel-cobalt-lithium-aluminate material synthesized by coprecipitation still has structural instability, and has strict requirements on the synthesis environment and battery production environment; 3. Ordinary nickel-cobalt-aluminate Lithium has poor charge-discharge cycle stability at relatively high voltage

Method used

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  • Lithium-ion battery precursor material, composite positive electrode material and preparation method thereof
  • Lithium-ion battery precursor material, composite positive electrode material and preparation method thereof
  • Lithium-ion battery precursor material, composite positive electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation nickel-cobalt ion concentration is 2mol / L, the nickel-cobalt mixed solution of Ni:Co=80:15, the sodium metaaluminate solution of aluminum content 0.5mol / L (the complex solution of aluminum and hydroxide, press Al 3+ :OH - =1:4 formulated), 4mol / L NaOH solution, 7mol / L ammonia water;

[0045] In the 150L reaction kettle, add ammonia solution as the bottom liquid in advance, the temperature is 50°C, (NH 3 ·H 2 O+NH 4 + ) concentration is 1mol / L, pH is 11.50±0.02, a total of 40L;

[0046] Feed nickel-cobalt mixed solution, sodium metaaluminate solution, NaOH solution and concentrated ammonia water into the reaction kettle separately, and the feeding speeds are: 20±1mL / min, 4.21±0.05mL / min, 20±5mL / min, 7±1mL / min, the reaction temperature is controlled at 50°C, the pH is 11.40-11.50, the stirring speed is 400r / min, and the reaction is stopped when the product particle size distribution D50=11.4-11.5 microns;

[0047] After the materials in the reactor w...

Embodiment 2

[0050] Preparation of nickel-cobalt ion concentration is 2mol / L, Ni:Co=80:10 nickel-cobalt mixed solution, aluminum content 0.5mol / L Al:EDTA=1:1.05 aluminum-containing complex solution, mass concentration 10% NaOH Solution, 0.5mol / l EDTA solution;

[0051] Add the EDTA solution as the bottom liquid in advance in the 150L reactor, the temperature is 50°C, the EDTA concentration is 0.02mol / L, the pH is 11.50±0.02, and the volume is 40L;

[0052] Feed nickel-cobalt mixed solution, aluminum-containing complex solution, NaOH solution and EDTA solution into the reaction kettle at the same time, and the feeding speeds are: 20±1mL / min, 8.89±0.05mL / min, 37±2mL / min , 2.7±0.1mL / min Continuous reaction under the condition of reaction temperature of 50°C, pH of 11.40-11.50, and stirring speed of 400r / min, stop the reaction when the product particle size distribution D50=11.4-11.5 microns;

[0053] After the materials in the reactor were left to stand for 1 hour, the supernatant was draine...

Embodiment 3

[0056] Preparation of nickel-cobalt ion concentration is 2mol / L, Ni:Co=80:15 nickel-cobalt mixed solution, aluminum content 0.5mol / L Al:EDTA=1:1.05 aluminum-containing complex solution, mass concentration 30% NaOH Solution, 7mol / L ammonia water;

[0057] In the 150L reaction kettle, add ammonia solution as the bottom liquid in advance, the temperature is 50°C, (NH 3 ·H 2 O+NH 4 + ) concentration is 1mol / L, pH is 11.50±0.02, volume is 40L;

[0058] Feed nickel-cobalt mixed solution, aluminum-containing complex solution, NaOH solution and concentrated ammonia water into the 150L reaction kettle at the same time. min and 7±1mL / min. The reaction temperature is 50°C, the pH is 11.40-11.50, and the stirring speed is 400r / min. The reaction is continued, and the reaction is stopped when the product particle size distribution D50=11.4-11.5 microns;

[0059] After the materials in the reactor were left to stand for 1 hour, the supernatant was drained away. Use deionized water, 4m...

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Abstract

The present invention relates to a lithium-ion battery positive electrode material precursor material with high-voltage charge and discharge stability, a composite positive electrode material synthetic method and a composite positive electrode material prepared by the method. The precursor material has the advantages of good sphericity, high density, strong lithium source adaptability, gentle mixing environment, and the like, the synthesized composite material has high tap density, compared with ordinary lithium nickel-cobalt-aluminum material, the composite material sensitivity to ambient moisture and carbon dioxide is reduced, and the composite material has good processing performance and storage performance, and exhibits high specific capacity and high stability characteristics when the composite material is charged and discharged in 2.8-4.4V and 2.8-4.5V voltage windows.

Description

technical field [0001] The invention relates to the field of lithium ion battery manufacturing, in particular to a lithium ion battery precursor material, a composite positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are recognized by the international community as the most ideal chemical power source for their high energy density, long life, small self-discharge, no memory effect, and environmental protection. They are widely used in mobile phones, notebook computers, power tools, and portable cameras. and other electronic products. At the same time, lithium-ion batteries play an important role in solving the peak-valley adjustment of grid power consumption and in the field of intermittent clean energy storage such as wind energy, solar energy and tidal energy. In addition, the ever-expanding fields of electric vehicles, electric bicycles, aerospace, military mobile communication tools and equipment will bring...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 吴层谭潮溥严亮黄殿华陈瑞祥张郑袁昌杰骆宏钧
Owner GUANGZHOU LIBODE NEW MATERIAL
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