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Preparation method of spherical porous lithium-ion battery high-voltage cathode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reversible capacity not meeting the target requirements, fast capacity decay, poor rate performance, etc., and achieve considerable reversible capacity and uniform particle size Consistent, improved energy density and power density effects

Inactive Publication Date: 2016-04-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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Problems solved by technology

But LiNi 0.5 mn 1.5 o 4 The biggest shortcoming is the loss of oxygen during the high-temperature synthesis process of the material at 650 ° C, and the formation of NiO or Li 1-x Ni x O impurities, which in turn lead to LiNi 0.5 mn 1.5 o 4 During high current charge and discharge, the capacity decays quickly, the rate performance is poor, and the reversible capacity is far from meeting the required target requirements.
In addition, during the charging and discharging process of the battery, LiNi 0.5 mn 1.5 o 4 When the material is in direct contact with the fluorine-containing electrolyte, it is easy to cause Ni 2+ React with trace amount of HF to produce NiF 2 , further reducing the LiNi 0.5 mn 1.5 o 4 Reversible capacity and rate performance of materials

Method used

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  • Preparation method of spherical porous lithium-ion battery high-voltage cathode material
  • Preparation method of spherical porous lithium-ion battery high-voltage cathode material
  • Preparation method of spherical porous lithium-ion battery high-voltage cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Dissolve 0.05 mol of nickel sulfate and 0.15 mol of manganese sulfate in a mixed solution of 50 mL of distilled water and ethanol (the volume ratio of distilled water to ethanol is 2:1), then add 0.31 mol of ammonium bicarbonate, stir at room temperature for 30 minutes, and then dissolve the obtained The mixture was put into a 200mL hydrothermal kettle to react at 210°C for 11h, and then the precipitate was filtered out, washed and dried to obtain a carbonate compound precursor. The obtained carbonic acid compound precursor and 0.0505 mol of lithium carbonate ball mill were mixed evenly, and then placed in a muffle furnace for 6 h at 500 ° C, and then 800 ° C for 12 h, and then kept at 600 ° C for 8 h, that is, the porous spherical shape with P4 3 32-structure high-voltage lithium-ion battery cathode material LiNi0.5 mn 1.5 o 4 . 0.0018molLiNO 3 , 0.00306molLa (NO 3 ) 3 ·6H 2 O, 0.00547molTi(C 4 h 9 O) 4 (Tetrabutyl titanate) was dissolved in 20 mL of ethanol, ...

Embodiment 2

[0029] Dissolve 0.05 mol of nickel sulfate and 0.15 mol of manganese sulfate in a mixed solution of 50 mL of distilled water and acetone (the volume ratio of distilled water to acetone is 2:1), then add 0.31 mol of ammonium bicarbonate, stir at room temperature for 30 minutes, and then dissolve the obtained The mixture was put into a 200mL hydrothermal kettle to react at 220°C for 12h, and then the precipitate was filtered out, washed and dried to obtain a carbonate compound precursor. Mix the obtained carbonic acid compound precursor and 0.11mol lithium hydroxide ball mill evenly, put it in a muffle furnace and bake it at 500°C for 6h, and then bake it at 800°C for 15h, and then keep it at 600°C for 5h, that is, the porous spherical shape with P4 3 32-structure high-voltage lithium-ion battery cathode material LiNi 0.5 mn 1.5 o 4 . With 0.0018mol lithium acetate, 0.00306mol lanthanum acetate, 0.00547molTi(C 4 h 9 O) 4 (Tetrabutyl titanate) was dissolved in 20 mL of etha...

Embodiment 3

[0031] Dissolve 0.05 mol of nickel sulfate and 0.15 mol of manganese sulfate in a mixed solution of 50 mL of distilled water and benzyl alcohol (the volume ratio of distilled water to benzyl alcohol is 2:1), then add 0.35 mol of ammonium bicarbonate, stir at room temperature for 30 minutes, and then The resulting mixture was added to a 200 mL hydrothermal kettle to react at 220° C. for 6 h, and then the precipitate was filtered out, washed and dried to obtain a carbonate compound precursor. Mix the obtained carbonic acid compound precursor and 0.11mol lithium acetate ball mill evenly, put it in a muffle furnace and bake it at 600°C for 6h, then bake it at 800°C for 15h, and then keep it at 600°C for 5h, that is, the porous spherical shape with P4 3 32-structure high-voltage lithium-ion battery cathode material LiNi 0.5 mn 1.5 o 4 . Dissolve 0.0018 mol of lithium acetate, 0.00306 mol of lanthanum acetate, and 0.00547 mol of tetrapropyl titanate in 20 mL of ethanol, then add ...

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Abstract

The invention discloses a preparation method of a spherical porous lithium-ion battery high-voltage cathode material and belongs to the technical field of lithium-ion batteries. The chemical formula of the material is LiNi0.5Mn1.5O4-Li3xLa(2 / 3)-xTiO3, wherein 0.05<x<0.15, and the mass fraction of the Li3xLa(2 / 3)-xTiO3 is 5%. The material is prepared by adopting an organic solvent assisted coprecipitation method. The preparation method is wide in raw material source, simple and convenient to operate, good in controllability and high in reproducibility, and the long-time high-energy-consumption high-temperature sintering process is avoided. The prepared material has the porous spherical characteristics, is small in granule, uniform in particle size distribution, high in crystallinity and better in rate performance, is of a P4332 structure and can be used as the high-performance lithium-ion battery high-voltage cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a spherical porous lithium ion battery high-voltage cathode material. Background technique [0002] With the development of various electronic devices as well as electric vehicles and hybrid vehicles, higher requirements are placed on the lithium-ion batteries that provide energy for them. Lithium-ion batteries have high capacity density and energy density, and are recognized as the most promising power batteries. [0003] However, the large-scale commercialization of lithium-ion batteries in the electric vehicle industry requires further improvement of their electrochemical performance. Among them, the specific energy of the battery is the bottleneck that restricts the mileage of electric vehicles. For example: taking the widely used lithium iron phosphate / graphite lithium-ion power battery as an example, its specific energy is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 伊廷锋朱彦荣梅洁诸荣孙
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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