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Preparation method of spherical lithium-rich ternary cathode material

A ternary material, lithium-rich technology, applied in the direction of positive electrodes, chemical instruments and methods, electrical components, etc., can solve the problems of large particles, poor electrochemical performance, high cost, etc., achieve uniform particle size, increase specific capacity, good topographical effect

Inactive Publication Date: 2019-12-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method of solid-phase synthesis has large particles, poor dispersion of the material, and poor electrochemical performance; the synthesis equipment of the coprecipitation method is complicated, which is not conducive to laboratory operation and high cost

Method used

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  • Preparation method of spherical lithium-rich ternary cathode material
  • Preparation method of spherical lithium-rich ternary cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The high-capacity lithium-rich ternary material Li was prepared according to the following steps 1.2 Ni 0.13 co 0.13 mn 0.54 o 2

[0028] (1) Accurately weigh nickel sulfate, cobalt sulfate and manganese sulfate according to the molar ratio of Ni:Co:Mn=0.13:0.13:0.54, and dissolve them in a mixed solvent of deionized water and ethylene glycol (1:1 by volume) , and magnetically stirred at 500r / min to make it fully dissolved to obtain a clear solution A;

[0029] (2) Transfer the solution A to a 100mL reaction kettle, and heat the reaction in a blast oven at 160°C for 20h;

[0030] (3) Obtain carbonate precursor precipitation, filter, wash three times with deionized water and ethanol;

[0031] (4) Put the carbonate precursor into a vacuum oven to dry for 12 hours;

[0032] (5) obtain dry carbonate precursor, it is mixed with lithium carbonate (molar ratio is 1:1.2);

[0033] (6) Put the mixture into a muffle furnace for pre-calcination at 450°C for 4 hours, then c...

Embodiment 2

[0035] The high-capacity lithium-rich ternary material Li was prepared according to the following steps 1.2 Ni 0.16 co 0.08 mn 0.56 o 2

[0036] (1) Accurately weigh nickel sulfate, cobalt sulfate and manganese sulfate according to the ratio of Ni:Co:Mn=0.16:0.08:0.56, and dissolve them in a mixed solvent of deionized water and ethylene glycol (1:1 by volume) , and magnetically stirred at a speed of 500r / min to fully dissolve it to obtain a clear solution A;

[0037] (2) Transfer the solution A to a 100mL reaction kettle, and heat the reaction in a blast oven at 160°C for 20h;

[0038] (3) Obtain carbonate precursor precipitation, filter, wash three times with deionized water and ethanol;

[0039] (4) Put the carbonate precursor into a vacuum oven to dry for 12 hours;

[0040] (5) obtain dry carbonate precursor, it is mixed with lithium carbonate (molar ratio is 1:1.2);

[0041] (6) Put the mixture into a muffle furnace for pre-calcination at 450°C for 4 hours, then ca...

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Abstract

The invention discloses a preparation method of a spherical lithium-rich ternary cathode material. The preparation method comprises the steps that Ni, Co and Mn salts are dissolved in a mixed solventof deionized water and glycol, a mixture is fully dissolved by magnetic stirring, and a clarified solution A is obtained; the solution A is transferred into a reaction kettle for a heating reaction; acarbonate precursor precipitate is obtained, filtered and washed with the deionized water and an ethanol solution for three times; a carbonate precursor is subjected to vacuum drying to obtain a dried carbonate precursor, and the dried carbonate precursor is evenly mixed with lithium carbonate; and finally a mixture is put into a muffle furnace for presintering at 450 DEG C, and then is calcinedat 900 DEG C, and cooling is conducted to the room temperature to obtain the spherical lithium-rich ternary material. According to the preparation method, a solvothermal method is adopted, the material prepared by the synthetic method has the uniform particle size, good morphology is easy to achieve, and the actual specific capacity of the cathode material can be improved.

Description

technical field [0001] The invention relates to a preparation method of a spherical lithium-rich ternary positive electrode material, belonging to the technical field of lithium ion battery materials. Background technique [0002] Lithium-rich manganese-based layered oxides can be expressed as xLi 2 MnO 3 -(1-x)LiMO 2 (M=Ni, Co, Mn). M.M. Thackeray et al. proposed a strategy to improve the layered LiNi x co y mn 1-x-y o 2 The structural stability and electrochemical performance of the material, even with structurally compatible Li 2 MnO 3 As stable LiNi x co y mn 1-x-y o 2 components. The charge and discharge capacity of this lithium-rich manganese-based material can reach more than 250mAh / g between 2.0-4.8V. Moreover, lithium-rich manganese-based layered oxides have the advantages of good thermal stability, wide charge-discharge voltage window, and low cost. In recent years, they have been considered as one of the most promising high-performance lithium-ion ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2004/03C01P2004/32C01P2006/40H01M4/366H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 刘杰张扬何瑶陈令郑胜军王德齐
Owner NANJING UNIV OF SCI & TECH