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A preparation method and application of low cobalt and high nickel ternary lithium

A technology of high nickel and nickel nitrate, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of poor thermal stability and cycle stability of materials, achieve high thermal stability, reduce cobalt content, and high cycle stability sexual effect

Active Publication Date: 2018-12-07
王丹亮 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the researches are focused on cladding and doping, which cannot essentially solve the problems of poor thermal stability and poor cycle stability of the material.

Method used

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  • A preparation method and application of low cobalt and high nickel ternary lithium
  • A preparation method and application of low cobalt and high nickel ternary lithium
  • A preparation method and application of low cobalt and high nickel ternary lithium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1 LiNi 0.875 co 0.025 mn 0.1 o 2 Preparation of cathode material

[0031] Include the following steps:

[0032] (1) Accurately weigh 2.25g of lithium acetate and dissolve it in 20mL of absolute ethanol, add 100mL of deionized water, and stir slowly with a magnetic stirrer;

[0033] (2) Slowly add 0.5 mol tetrabutyl titanate dropwise to the solution obtained in step (1) and continue stirring, add a saturated solution containing 1.5 mol cobalt nitrate to obtain a gel;

[0034] (3) Put the above gel at 120° C. for 8 hours, and the gel becomes a solution again;

[0035] (4) The solution obtained in (3) is evaporated and crystallized to obtain the traction agent (LiTi 0.25 co 0.75 o 2 );

[0036] (5) Get 8.75mol nickel nitrate, 0.25mol titanium nitrate, 1mol manganese nitrate dissolved in deionized water, and spray dry to obtain Ni 0.875 Ti 0.025 mn 0.1 (OH) 2 Precursor;

[0037] (6) Take 9mol of Ni 0.875 Ti 0.025 mn 0.1 (OH) 2 Precursor, 0.3mol tra...

Embodiment 2

[0040] Example 2 LiNi 0.875 co 0.025 mn 0.1 o 2 Preparation of cathode material

[0041] Include the following steps:

[0042] (1) Accurately weigh 2.25g of lithium acetate and dissolve it in 20mL of absolute ethanol, add 100mL of deionized water, and stir slowly with a magnetic stirrer;

[0043] (2) Slowly add 0.4 mol tetrabutyl titanate dropwise to the solution obtained in step (1) and continue stirring, add a saturated solution containing 1.2 mol cobalt nitrate to obtain a gel;

[0044](3) Put the above gel at 120° C. for 8 hours, and the gel becomes a solution again;

[0045] (4) The solution obtained in (3) is evaporated and crystallized to obtain the traction agent (LiTi 0.25 co 0.75 o 2 );

[0046] (5) Get 17.5mol nickel nitrate, 0.5mol titanium nitrate, 2mol manganese nitrate dissolved in deionized water, and spray dry to obtain Ni 0.875 Ti 0.025 mn 0.1 (OH) 2 Precursor;

[0047] (6) Take 18mol of Ni 0.875 Ti 0.025 mn 0.1 (OH) 2 Precursor, 0.6mol trac...

Embodiment 3

[0050] Example 3 LiNi 0.875 co 0.025 mn 0.1 o 2 Application of Cathode Material as Cathode in Lithium-ion Batteries

[0051] Application 1: Accurately weigh 160 mg of LiNi prepared in Example 1 0.875 co 0.025 mn 0.1 o 2 , 20mgPVDF, 20mgSuper P carbon black, dispersed in 1mLNMP (N-methylpyrrolidone), stirred to dissolve PVDF and mix other materials evenly, and then coated on 12 micron thick double-sided glossy aluminum foil to obtain the required positive electrode aluminum foil , directly assembled with lithium sheets to form a lithium-ion half-cell after cutting. (In this application, LiNi 0.875 co 0.025 mn 0.1 o 2 , polyvinylidene fluoride and super phosphorus carbon black mass ratio is 8:1:1)

[0052] Application 2: Accurately weigh 140 mg of LiNi prepared in Example 1 0.875 co 0.025 mn 0.1 o 2 , 20mgPVDF, 40mgSuper P carbon black, dispersed in 1mLNMP and stirred to dissolve PVDF and mix other materials evenly, and then coated on 5 micron thick double-sided ...

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Abstract

The invention discloses a preparation method and application of ternary lithium with low cobalt and high nickel. The preparation method comprises the following steps: spray drying a mixed aqueous solution of nickel nitrate, titanium nitrate and manganese nitrate with a molar ratio of 8.75: 0.25: 1 to obtain a precursor; mixing precursor, traction agent and lithium hydroxide in water according to amolar ratio of 30: 1:30 to obtain a suspension liquid, stirring at 120-180 DEG C for 6-12h, spray drying, calcining at 650-850 DEG C in an oxygen atmosphere for 4-8h; The preparation method of the precursor comprises the following steps of: adding ethanol to lithium acetate; Adding tetrabutyl titanate and cobalt nitrate aqueous solution into the aqueous solution dropwise to form gel; keeping constant temperature at 100 to 120 DEG C for 8 to 12 hours, and then evaporating and crystallize to obtain that product. This method firstly improves the cell structure of ternary materials by using titanium element with better cell parameters, then initiates titanium-cobalt interchange by using traction agent so as to obtain higher nickel ternary materials with better cell parameter structure. Due tothe improvement of the cell structure, the ternary material not only further reduces the cobalt content, but also greatly improves its thermal stability, cycle life and safety.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to a special traction agent (LiTi 0.25 co 0.75 o 2 ) induced ion substitution method synthesized low-cobalt high-nickel ternary lithium (NCM, LiNi 0.875 co 0.025 mn 0.1 o 2 ) as a preparation method and application of a cathode material for a lithium ion battery. Background technique [0002] With the application of lithium-ion batteries in electronic equipment and the promise of lithium-ion batteries to solve the problems in the field of power batteries, people's attention to lithium-ion batteries has greatly increased in recent years. However, with the continuous improvement of people's demand for cruising range, the original lithium-ion battery electrode material system has been difficult to continue to meet. Therefore, it is imminent to develop new lithium-ion battery electrode materials with high energy density. Therefore, high-nickel ternary lithium (811...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王丹亮万远鑫
Owner 王丹亮
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