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A kind of high-nickel ternary positive electrode material with twice surface modification and preparation method thereof

A positive electrode material and subsurface technology, applied in the field of high-nickel ternary positive electrode materials and its preparation, can solve the problems of lower thermal decomposition temperature, large amount of desorption, and low thermal stability of materials, and achieve long cycle life and broad application prospects , the effect of high specific energy

Inactive Publication Date: 2020-09-15
博澳郢创(厦门)能源科技有限公司
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AI Technical Summary

Problems solved by technology

However, there are still some problems, including: 1) the detachment of Li on the surface is larger during charging, resulting in structural instability and the formation of a non-electrochemically active NiO-like phase with a rock-salt structure; 2) due to the high Ni content, the thermal decomposition temperature decreases, The heat release increases, and the thermal stability of the material is low; 3) The compatibility with the electrolyte becomes poor, and it is easy to react with the electrolyte, causing the dissolution of Co and Ni ions, which reduces the cycle life and storage life
The above problems lead to poor cycle performance and safety performance of lithium-ion batteries

Method used

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  • A kind of high-nickel ternary positive electrode material with twice surface modification and preparation method thereof
  • A kind of high-nickel ternary positive electrode material with twice surface modification and preparation method thereof
  • A kind of high-nickel ternary positive electrode material with twice surface modification and preparation method thereof

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preparation example Construction

[0032] A preparation method of a high-nickel ternary positive electrode material modified twice, comprising the following steps:

[0033] Step 1, the soluble salt of cobalt sulfate, nickel sulfate and manganese sulfate or A is made into solution S;

[0034] Step 2. Add the precipitating agent and the chelating agent into the stirring solution S, adjust the solution temperature to 30-70°C, and the pH to 10.0-12.0 to precipitate the high-nickel precursor P1;

[0035] Step 3: Wash the high-nickel precursor P1 to remove residual ions, dry it in an environment of 100-350°C and set it aside;

[0036] Step 4: Mix the high-nickel precursor P1 with the precursor P2 and lithium hydroxide, put it into a sagger, oxidize it under oxygen at 700-800°C for 5-20 hours, and obtain the first-calcined product C1 after crushing;

[0037] Step 5: Add the one-calcined product C1 into the reaction kettle, pass through the pre-prepared citric acid-methanol-ethanol solution, stir continuously for 0.5-...

Embodiment 1

[0048] Firstly, nickel sulfate, cobalt sulfate, manganese sulfate and aluminum sulfate are made into a solution according to the elemental molar ratio Ni0.82Co0.14Mn0.01Al0.03. Under vigorous stirring, the solution temperature is 50°C and the speed is 700r / min; add hydroxide Sodium solution and ammonia water, adjust the pH to 11.5±0.05, and precipitate the precursor; the precursor is washed and dried, and mixed with Co3O4 and lithium hydroxide with a particle size D50 of 150 nanometers. The amount of Co3O4 added is 0.5% of the mass of the precursor. The Li / me ratio is 1.03. After the mixing is completed, put it into a sagger, and carry out high-temperature sintering in an oxygen atmosphere at 765°C for 10 hours in a high-temperature roller kiln or an experimental box-type furnace to obtain a first-fired powder; the obtained powder is added to a stirred tank , into the pre-prepared citric acid-methanol-ethanol solution, stirred for 20 minutes, vacuum-dried for 3 hours after suct...

Embodiment 2

[0052] In this embodiment, the similarities with Embodiment 1 will not be repeated, and the difference is: the design ratio is Ni0.58Co0.195Mn0.195Mg0.03. The primary sintering temperature is 850°C. The secondary sintering temperature is 400°C.

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Abstract

The invention discloses a high-nickel ternary positive electrode material subjected to twice surface modification. The positive electrode material is a lithium-nickel-cobalt-manganese-aluminum multibasic oxide; the positive electrode material comprises a substrate and a second modification layer; a chemical structural formula of the substrate is LiNixCoyMnzAwO2, wherein x+y+z+w=1, x is greater than or equal to 0.6 and is less than or equal to 0.9, y is greater than 0 and is less than or equal to 0.2, z is greater than 0 and is less than or equal to 0.2, and A is selected from one or more of Al, Mg and Zr and w is greater than 0 and is less than or equal to 0.1. Solution is prepared by cobalt sulfate, nickel sulfate, manganese sulfate and soluble salt containing a metal element A, the obtained powder is added into a reaction kettle containing citric acid-methanol-ethanol solution to stir and dry to obtain powder, a modified additive is further added to carry out high-temperature sintering at the sintering temperature of 300-800 DEG C, and finally the high-nickel ternary positive electrode material subjected to twice surface modification is obtained; the material has the advantages of being high in specific energy and long in cycle life, and has a wide application prospect.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a high-nickel ternary positive electrode material with twice surface modification and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and cycle efficiency, low self-discharge, no memory effect, etc., and have broad application prospects in power batteries. At present, many automobile manufacturers all choose lithium-ion batteries as the power source of electric vehicles, and have launched electric vehicles of their own brand models. As a means of transportation, electric vehicles are the focus of everyone's attention on their mileage, acceleration performance, safety performance, etc., and these aspects mainly depend on the performance of the power battery, focusing on energy density, power density, cycle life, safety, etc. aspect. [0003] From the perspective of b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505
CPCH01M4/505H01M4/525Y02E60/10
Inventor 罗灏程建聪陈永翔范友作
Owner 博澳郢创(厦门)能源科技有限公司
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