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A kind of preparation method of composite material coating lithium nickel manganese oxide

A technology of lithium nickel manganese oxide and composite materials, which is applied in the field of battery material preparation, can solve problems such as restricting battery performance, and achieve the effects of inhibiting the dissolution of manganese, good crystallization, and guaranteed capacity and cycle performance

Active Publication Date: 2017-12-05
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially after the lithium nickel manganese oxide battery is stored at high temperature, a large amount of gas will accumulate inside the battery, and the expansion phenomenon of the battery is very obvious, which seriously restricts the performance of the battery

Method used

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  • A kind of preparation method of composite material coating lithium nickel manganese oxide
  • A kind of preparation method of composite material coating lithium nickel manganese oxide
  • A kind of preparation method of composite material coating lithium nickel manganese oxide

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Effect test

Embodiment 1

[0022] (1) Preparation of pure-phase lithium nickel manganese oxide precursor: Accurately weigh lithium carbonate, nickel sulfate, and manganese sulfate according to the Li:Ni:Mn element ratio of 2:1:3, and disperse them by ball milling with isopropanol for 1 h. The obtained slurry was vacuum-dried at 80°C, pre-fired in an air atmosphere of 400°C for 3 hours after grinding, cooled naturally, taken out, and ground to obtain a pure-phase lithium nickel manganese oxide precursor;

[0023] (2) ultrasonically disperse the pure-phase lithium nickel manganese oxide precursor in isopropanol, and stir to obtain the lithium nickel manganese oxide precursor suspension;

[0024] (3) According to Li: Ca: Zr: Ti = 2: 0.01: 0.01: 0.01, weigh calcium acetate, zirconium hydroxide, and tetrabutyl titanate, add them to the suspension of lithium nickel manganese oxide in step (2), add 1% PEG as dispersant and 1% citric acid complexing agent, add ammonia water dropwise to adjust pH to 9, stir mech...

Embodiment 2

[0028] (1) Preparation of pure-phase lithium nickel manganese oxide precursor: Accurately weigh lithium acetate, nickel nitrate, and manganese nitrate according to Li:Ni:Mn element ratio of 2:1:3, and disperse them by ball milling with absolute ethanol for 2 hours. The obtained slurry was vacuum-dried at 85°C, pre-fired in an air atmosphere of 450°C for 3.5 hours after grinding, cooled naturally, taken out, and ground to obtain a pure-phase lithium nickel manganese oxide precursor;

[0029] (2) ultrasonically disperse the pure-phase lithium nickel manganese oxide precursor in absolute ethanol, and stir to obtain the lithium nickel manganese oxide precursor suspension;

[0030] (3) By Li: Ca: Zr: Ti=2: 0.02: 0.02: 0.02, take calcium carbonate, zirconium nitrate, titanium tetrachloride, add in step (2) lithium nickel manganese oxide suspension, mass fraction is 2% PEG as a dispersant, 3% citric acid as a complexing agent, add ammonia water dropwise to adjust the pH to 9.2, mecha...

Embodiment 3

[0034] (1) Preparation of pure-phase lithium nickel manganese oxide precursor: Accurately weigh lithium nitrate, nickel chloride, and manganese nitrate according to Li:Ni:Mn element ratio of 2:1:3, and disperse them by ball milling with acetone for 3 hours to obtain The slurry was vacuum-dried at 90°C, pre-fired in an air atmosphere of 500°C for 4.5 hours after grinding, cooled naturally and then ground to obtain a pure-phase lithium nickel manganese oxide precursor;

[0035] (2) ultrasonically disperse the pure-phase lithium nickel manganese oxide precursor in acetone, and stir to obtain the lithium nickel manganese oxide precursor suspension;

[0036] (3) According to Li: Ca: Zr: Ti = 2: 0.03: 0.03: 0.03, weigh calcium oxalate, zirconium n-propoxide, and titanium tetrachloride, add them to the suspension of lithium nickel manganese oxide in step (2), add PEG with a mass fraction of 3% was used as a dispersant, citric acid with a mass fraction of 4% was used as a complexing a...

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Abstract

The invention discloses a preparation method for a nickel lithium manganate coated composite material. The preparation method comprises the following steps of adding a composite solution of a calcium salt, a zircon salt and a titanium salt into a pure-phase nickel lithium manganate precursor suspension liquid, simultaneously adding polyethylene glycol (PEG) as a dispersing agent and citric acid as a complexing agent, adjusting pH with ammonia water, carrying out mechanical stirring and constant-temperature waterbath reaction, taking out and ageing the composite solution, and carrying out filtering, washing and drying to obtain a Cao-ZrO2-TiO2 coated nickel lithium manganate precursor, wherein the composite solution is prepared from Li, Ca, Zr and Ti according to the ratio of 2:x:x:x, and x is equal to (0.01-0.1); and carrying out calcination and annealing processing in an air atmosphere to obtain the CaO-ZrO2-TiO2 coated nickel lithium manganate composite material. The material obtained according to the preparation method is pure in phase, well crystallization is achieved, the process is simple, continuous industrial production is easily realized, moreover, the initial discharging specific capacity at 0.2C reaches over 130mAh / g, and the cycle capacity retention rate at 0.2C after rate of 100 times is over 97%.

Description

technical field [0001] The present invention relates to a kind of preparation method of anode material of lithium ion battery, relate in particular to a kind of composite material coating lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) preparation method, which belongs to the technical field of battery material preparation. technical background [0002] In the 21st century, energy crisis and environmental degradation have become two major problems to be solved in the world today. In order to solve the above problems, the development of electric vehicles and hybrid vehicles is one of the main methods. However, for a long time, the development of electric vehicles has been restricted by the development of power battery technology. The new lithium-ion battery belongs to the field of clean energy. It has the advantages of good safety, good cycle performance, long life, non-toxic and pollution-free, making it the first choice for power batteries. Spinel lithium nickel m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 刘兴亮杨茂萍汪涛
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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