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Quad-element lithium ion battery anode material and preparing method

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost and poor stability, and achieve the effects of reducing costs, simple and reliable methods, and improving cycle stability

Inactive Publication Date: 2018-07-17
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: the cost of the existing high-nickel ternary lithium-ion battery is relatively high, the stability is poor and the safety and stability need to be further improved. The present invention provides a quaternary lithium-ion battery that solves the above problems Battery positive electrode material and preparation method

Method used

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  • Quad-element lithium ion battery anode material and preparing method

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Experimental program
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Effect test

Embodiment 1

[0026] Step 1, first calculate and weigh nickel acetate, cobalt acetate, manganese acetate, and iron sulfate according to the molar ratio of each element as Ni:Co:Mn:Fe=0.6:0.1:0.2:0.1, and add all the above raw materials into deionized water Carry out dissolving and be mixed with the solution A of 0.6mol / L;

[0027] Step 2, adding the precipitating agent oxalic acid into deionized water to dissolve and prepare 0.6mol / L solution B;

[0028] Step 3, using solution B as the base solution, add solution A to solution B at a rate of 3mL / min for stirring and mixing, the stirring rate is 700rpm, the temperature is 40°C, the pH is 2, and the reaction time is 6h; after the reaction is completed, put Suction filter, wash and dry the precipitate to obtain a homogeneous co-precipitated quasi-spherical nickel-cobalt-manganese-iron oxalate precursor. The drying temperature is 70°C, the drying time is 12 hours, and the drying time is 10 hours to obtain dry spherical nickel-cobalt-manganese-i...

Embodiment 2

[0033] Step 1, first calculate and weigh nickel nitrate, cobalt nitrate, manganese nitrate, iron nitrate according to the molar ratio of each element as Ni:Co:Mn:Fe=0.6:0.1:0.2:0.1, and add all the above raw materials into deionized water Carry out dissolving and be mixed with the solution A of 0.7mol / L;

[0034] Step 2, adding the precipitating agent oxalic acid into deionized water to dissolve and prepare 0.7mol / L solution B;

[0035] Step 3, using solution B as the base solution, add solution A to solution B at a rate of 6mL / min for stirring and mixing, the stirring rate is 740rpm, the temperature is 46°C, the pH is 3, and the reaction time is 7h; after the reaction is completed, put Suction filter, wash and dry the precipitate to obtain uniform co-precipitated quasi-spherical nickel-cobalt-manganese-iron oxalate precursor. The drying temperature is 78°C, the drying time is 13 hours, and the drying time is 13 hours to obtain dry spherical nickel-cobalt-manganese-iron-4 Pre...

Embodiment 3

[0039] Step 1, first calculate and weigh nickel sulfate, cobalt sulfate, manganese sulfate, and iron nitrate according to the molar ratio of each element as Ni:Co:Mn:Fe=0.6:0.1:0.2:0.1, and add all the above raw materials into deionized water Carry out dissolving and be mixed with the solution A of 0.8mol / L;

[0040] Step 2, adding the precipitating agent ammonium oxalate into deionized water to dissolve and prepare 0.8mol / L solution B;

[0041] Step 3, using solution B as the base solution, add solution A to solution B at a rate of 8mL / min for stirring and mixing, the stirring rate is 780rpm, the temperature is 50°C, the pH is 4.5, and the reaction time is 9h; after the reaction is completed, put Suction filter, wash and dry the precipitate to obtain uniform co-precipitated quasi-spherical nickel-cobalt-manganese-iron oxalate precursor. The drying temperature is 90°C, the drying time is 14 hours, and the drying time is 15 hours to obtain dry spherical nickel-cobalt-manganese-ir...

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Abstract

The invention discloses a quad-element lithium ion battery anode material and a preparing method. The molecular formula of the quad-element lithium ion battery material is LiNi0.6Co0.1Mn0.1Fe0.1O2. The preparing method of the battery anode material includes the following steps of weighing soluble nickel salt, soluble cobalt salt, soluble manganese salt and soluble iron salt, adding the salts to deionized water at the same time to be dissolved to prepare a mixed solution, adding a precipitant to the deionized water to be dissolved to prepare a precipitant solution, dropwise adding the mixed solution to the precipitant solution to be stirred and mixed, conducting coprecipitation, suction filtration, washing and drying to obtain a precursor for standing and ageing, evenly mixing the nickel-cobalt-manganese-iron four-element material precursor and a lithium source, and conducting presintering, grinding and secondary calcinating to obtain the nickel-cobalt-manganese-iron four-element anodematerial. By introducing the fourth element, namely iron, to a three-element material, since the radius and electronegativity of an introduced ion are close to those of a replaced element, damage cannot happen after introduction, the layer structure of the material can be stabilized, and the circulation stability of the material is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a positive electrode material for a quaternary lithium ion battery and a preparation method thereof. Background technique [0002] With the continuous consumption of traditional fossil energy and the increasing environmental problems, it is urgent to solve the key issues that limit new energy vehicles - the safety and energy density of batteries. Since the 1980s, layered lithium cobalt oxide (LiCoO 2 ) has become the cathode material of lithium-ion batteries, scholars have successively proposed layered lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 o 4 ) and olivine-type lithium iron phosphate (LiFePO 4 ) and other cathode materials. However, with the application of these cathode materials, there are many shortcomings: such as LiCoO 2 Although the performance is stable, the cost is high, and the cobalt element has the risk of environmental pollution; LiFe...

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 李峻峰刘磊李平肖逸菲张志涛张力张佩聪岳波赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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