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Ternary positive electrode material of high-nickel monocrystal-like lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of reduced material energy density, irreversible capacity loss, etc., and achieve improved processing performance, less impurities, and complete and sufficient reaction. Effect

Active Publication Date: 2020-03-27
新乡天力锂能股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ni 2+ Occupy Li + position, but during the discharge process Ni 2+ Can't be like Li + The energy density of the material is reduced, resulting in an irreversible capacity loss, which reduces the energy density of the material

Method used

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  • Ternary positive electrode material of high-nickel monocrystal-like lithium ion battery and preparation method thereof
  • Ternary positive electrode material of high-nickel monocrystal-like lithium ion battery and preparation method thereof
  • Ternary positive electrode material of high-nickel monocrystal-like lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Synthesis of precursors:

[0031] Mix nickel sulfate, cobalt sulfate, manganese sulfate and magnesium sulfate according to the element molar ratio of Ni:Co:Mn:Mg=0.80:0.10:0.097:0.003 to form a metal ion mixture with a metal ion concentration of 2.5mol / L; 5mol / L NaOH solution; prepare ammonia water with a concentration of 6mol / L. Pass N 2 While protecting, add the above-mentioned metal ion mixture, NaOH solution, and ammonia solution into the reactor at a flow ratio of 1:3:0.2, and keep the pH value in the reactor at 11.6. After the reaction is completed, the obtained precipitate is filtered, washed, dried, and passed through a 300-mesh sieve to obtain a precursor.

[0032] Synthesized precursor Ni 0.80 co 0.10 mn 0.097 Mg 0.003 (OH) 2 The particle size is: D10: 1.2 μm; D50: 3.0 μm; D90: 5.5 μm, and the particle size distribution conforms to the normal distribution.

[0033] Raw material pretreatment:

[0034] The precursor Ni prepared above 0.80 co 0.10 mn ...

Embodiment 2

[0048] Synthesis of precursors:

[0049] Mix nickel nitrate, cobalt nitrate, manganese nitrate and aluminum nitrate according to the element molar ratio of Ni:Co:Mn:Al=0.70:0.15:0.148:0.002 to form a metal ion mixture, the metal ion concentration is 3.0mol / L; 4.5mol / L NaOH solution; prepare ammonia water with a concentration of 8mol / L. Pass N 2 While protecting, add the above-mentioned metal ion mixture, NaOH solution, and ammonia solution into the reactor at a flow ratio of 1:6:2, and keep the pH value in the reactor at 11.3. After the reaction is completed, the obtained precipitate is filtered, washed, dried, and passed through a 300-mesh sieve to obtain a precursor.

[0050] Synthesized precursor Ni 0.70 co 0.15 mn 0.148 al 0.002 (OH) 2 The particle size is: D10: 1.0 μm; D50: 3.1 μm; D90: 5.4 μm, and the particle size distribution conforms to the normal distribution.

[0051] Raw material pretreatment:

[0052] The precursor Ni prepared above 0.70 co 0.15 mn 0.1...

Embodiment 3

[0061] Synthesis of precursors:

[0062] Nickel chloride, cobalt chloride, manganese chloride and zirconium nitrate are prepared in the molar ratio of Ni:Co:Mn:Zr=0.83:0.12:0.047:0.003 to form a metal ion mixture, and the metal ion concentration is 2.5mol / L ; The configuration concentration is 4mol / L NaOH solution; the preparation concentration is 8mol / L ammonia water. Pass N 2 While protecting, add the above-mentioned metal ion mixture, NaOH solution, and ammonia solution into the reactor at a flow ratio of 1:3:2, and keep the pH value in the reactor at 11.8. After the reaction is completed, the obtained precipitate is filtered, washed, dried, and passed through a 300-mesh sieve to obtain a precursor. Synthesized precursor Ni 0.83 co 0.12 mn 0.047 Zr 0.003 (OH) 2 The particle size is: D10: 1.2μm; D50: 3.3μm; D90: 5.6μm, and the particle size distribution conforms to the normal distribution.

[0063] Raw material pretreatment:

[0064] The precursor Ni prepared above ...

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Abstract

The invention discloses a preparation method of a ternary positive electrode material of a high-nickel monocrystal-like lithium ion battery and the prepared ternary positive electrode material. The preparation method comprises the following steps: sintering a precursor and a lithium source in air or oxygen; uniformly mixing the precursor metal oxide A and lithium oxide obtained by sintering according to a molar ratio of lithium to metal ions in A of 1.0-1.1, and carrying out primary sintering in oxygen to obtain B; adding 30-70% by mass of B into pure water, uniformly mixing, adding 0.5-3% bymass of an oxidizing agent without metal ions, and stirring at 10-50 DEG C for 10-30 minutes; filtering, drying, carrying out secondary sintering in oxygen, and sieving to obtain the ternary positiveelectrode material LiNi<x>Co<y>Mn<z>M<t>O<2> of the high-nickel single-crystal-like lithium ion battery, wherein x is more than or equal to 0.60 and less than or equal to 0.90, y is more than or equalto 0.05 and less than or equal to 0.20, z is more than or equal to 0 and less than or equal to 0.20, t is more than or equal to 0 and less than or equal to 0.005, x+y+z+t is equal to 1, and M is oneof Al, Ca, Mg, Zr, Ti, Sr, Mo, W and Ce. The ternary positive electrode material of the high-nickel single-crystal-like lithium ion battery contains divalent nickel, has few surface impurities lithiumand impurities, and is good in processability, high in capacity and good in cycle performance when being used for manufacturing the battery.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a ternary positive electrode material for a high-nickel single crystal lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, less environmental pollution, and low self-discharge rate. The positive electrode material of the battery is one of the core materials of the lithium-ion battery, which accounts for the entire battery cost. About 30% of the lithium-ion battery directly affects the performance and cost. In recent years, with the development of power batteries in the new energy electric vehicle industry, higher requirements have been placed on the safety performance, energy density, and cycle performance of cathode materials in lithium-ion batteries. [0003] The advantages of low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 岳磊王瑞庆蔡碧博魏玲张磊闫晓志陈树茂
Owner 新乡天力锂能股份有限公司
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