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Gradient single-crystal positive electrode material, preparation method and application

A positive electrode material and single crystal technology, applied in the field of gradient single crystal positive electrode materials, can solve the problems of battery life attenuation, particle breakage, poor rate performance, etc., to improve high voltage performance, prevent structural stability, and excellent rate performance effect

Active Publication Date: 2021-12-10
HENAN KELONG NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This sharp edge will cause serious wear and tear on the equipment during the battery electrode preparation process, shorten the service life of equipment accessories, and greatly increase the manufacturing cost of the battery; The degree of charge and discharge is not uniform, which causes a strong polarization, and even the particles are broken during the cycle, and the battery life decays rapidly
And traditional single crystal ternary materials usually have poor rate performance

Method used

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  • Gradient single-crystal positive electrode material, preparation method and application
  • Gradient single-crystal positive electrode material, preparation method and application
  • Gradient single-crystal positive electrode material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) NiSO 4 、CoSO 4 and MnSO 4 According to the molar ratio of Ni:Co:Mn=6:1:3, the mixed salt solution is formulated, the concentration of the mixed solution A is 2mol / L; the NaOH solution with a concentration of 5mol / L is used as a precipitant; the prepared concentration is 6mol / L The ammonia solution is used as a complexing agent; the mixed salt solution, NaOH solution and ammonia solution are continuously added to the stirred reaction vessel with a metering pump, the reaction temperature is kept at 40 °C, the pH is kept at 11, and the stirring speed is 500 r / min , the whole process of the reaction is protected by an inert gas; after the reaction, the obtained precipitate is filtered, washed, and dried at 110°C for 4-12h to obtain a Ni with a D50 of 3.5 microns 0.6 co 0.1 mn 0.3 (OH) 2 Precursor (NCM613 precursor).

[0031] Lithium carbonate and prepared Ni 0.6 co 0.1 mn 0.3 (OH) 2Weigh 1.07kg of lithium carbonate and 2.5kg of NCM613 precursor based on a mola...

Embodiment 2

[0047] Mix 0.96kg of nano-scale metal Ni, 0.16kg of nano-metal Co and 0.45kg of nano-metal Mn in a high-speed mixer at 3000rpm for 3 minutes, then add 1.07kg of lithium carbonate, and continue mixing at 3000rpm for 8 minutes. Check that the materials have no white spots, and the mixing is complete. Put the mixed material into a 330*300*100mm alumina ceramic sagger, flatten the material, and use a cutter to evenly cut the material into 36 pieces, then put it into the atmosphere box furnace, and feed 60L / min of pure oxygen, the heating rate is 3°C / min, the temperature is raised to the first sintering temperature of 970°C and kept for 12h, and then naturally cooled. The cooled material is crushed into a crushed material smaller than 2mm by a double pair of rollers, and then the crushed material is crushed and classified by a jet mill to obtain a conventional single crystal 613 positive electrode material with a D50 of 3.8 microns. Subsequent preparation method is the same as tha...

Embodiment 3

[0049] The conventional single crystal 613 cathode material 1.5kg and 118g nanometer Co(OH) obtained in step (2) of Example 1 2 1.5kg of conventional single crystal 613 cathode material and 118g of nanometer Co(OH) obtained by "changed to" 2 and 2.8g nano-Al 2 o 3 ", other with embodiment 1

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Abstract

The invention discloses a gradient single-crystal positive electrode material. The chemical formula of the single-crystal positive electrode material is LiNi<x>Co<y>A<1-x-y>O2@mLiZO<c>, wherein 0 < x < 1, 0 < y < 1, 0 < x + y < 1, 0 < m < 0.05, 0.3 < a < = 10, 1 < = b < 4, and 1 < = c < 15; and A is at least one of Mn, Zr, Sr, Ba, W, Ti, Al, Mg, Y and Nb, and Z is at least one of B, Al, Co, W, Ti, Zr and Si. The atomic proportion of the Co on the surface of the single-crystal positive electrode material particle to Ni + Co + A on the surface is greater than 0.4 and less than 0.8, and the atomic proportion of Co at a position which is 10% radius depth away from the surface of the single-crystal positive electrode material particle is not less than 0.3. The single-crystal positive electrode material is good in particle sphericity and free of sharp corners. The invention also provides a preparation method and application of the gradient single-crystal material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a gradient single crystal positive electrode material, a preparation method and an application. Background technique [0002] In recent years, ternary lithium batteries have gradually become the most mainstream batteries on the market due to their advantages of high capacity, good cycle stability and moderate cost. Ternary cathode materials can be divided into two types in terms of morphology: single crystal and polycrystalline. Comparing the performance of single crystal and polycrystalline ternary materials, the overall energy density of the single crystal ternary material system is higher, and it performs better in terms of safety performance and cycle performance. excellent. Especially the graded single crystal material, it has small impedance, stable cycle performance, high capacity retention rate and high thermal stability in the cycle process. H...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/04H01M4/36H01M10/0525C01G1/02C01G53/00C30B1/10C30B29/22
CPCH01M4/505H01M4/525H01M4/485H01M4/0471H01M4/366H01M10/0525C01G53/50C01G1/02C30B29/22C30B1/10H01M2004/028C01P2004/80Y02E60/10C30B1/04C01G53/006C01P2004/61C01P2004/84H01M2004/021H01M4/131H01M10/052H01M4/1391C30B1/02C30B1/12
Inventor 李金锁左高峰陈丹凤黄静栗晓静文万超徐云军程迪
Owner HENAN KELONG NEW ENERGY CO LTD
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