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A kind of preparation method of nickel-cobalt-manganese ternary precursor with low sulfur and high tap density

A technology of nickel-cobalt-manganese ternary and tap density, which is applied in the direction of electrical components, structural parts, battery electrodes, etc., can solve the problems of not meeting high tap density and low sulfur content at the same time, and achieve high density and low concentration of lye Effect

Active Publication Date: 2020-05-19
ZHEJIANG HUAYOU COBALT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the products prepared by the above three patents simultaneously meet the indicators of high tap density and low sulfur content

Method used

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  • A kind of preparation method of nickel-cobalt-manganese ternary precursor with low sulfur and high tap density
  • A kind of preparation method of nickel-cobalt-manganese ternary precursor with low sulfur and high tap density
  • A kind of preparation method of nickel-cobalt-manganese ternary precursor with low sulfur and high tap density

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Low sulfur high tap density Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The preparation of ternary precursor, D50 is 10.4μm, TD is 2.30g / cc, S content is 1071ppm, the preparation process is as follows:

[0028] (1) According to Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 The molar ratio of nickel, cobalt and manganese in the medium weighs the weight of nickel sulfate, cobalt sulfate and manganese sulfate, and adds pure water to make a mixed solution. The total concentration of metal content in the mixed solution is 1.5mol / L; the concentration of the lye is 5mol / L, Configure the concentration of ammonia water to be 15%.

[0029] (2) Use a 200L titanium reactor with controllable temperature and speed, add 40-50L pure water as the bottom liquid before starting the machine, start stirring to 595-605rpm, heat up to 53-57°C, add ammonia and lye, and adjust the bottom liquid When the pH value reaches 12.25~12.35, the ammonia value is 4~5g / L, and after 0.1~0.2 hours of passing through the protective g...

Embodiment 2

[0034] Low sulfur high tap density Ni 0.5 co 0.2 mn 0.3 (OH) 2 The preparation of the ternary precursor, the D50 is 12.5 μm, the TD is 2.32g / cc, and the S content is 1100ppm. The preparation process is as follows:

[0035] (1) According to Ni 0.5 co 0.2 mn 0.3 (OH) 2 The molar ratio of nickel, cobalt and manganese in the middle weighs the weight of nickel sulfate, cobalt sulfate and manganese sulfate, and adds pure water to form a mixed solution. The total concentration of metal content in the mixed solution is 2mol / L; The concentration of ammonia water is 20%.

[0036] (2) Use a 5000L titanium reactor with controllable temperature and speed, add 1000-1200L pure water as the bottom liquid before starting the machine, start stirring to 398-405rpm, heat up to 50°C, add ammonia and lye, and adjust the pH value of the bottom liquid To 11.55~11.65, the ammonia value is 6~7g / L, after 0.5h of the protective gas, the peristaltic pump of the metal material liquid, lye, and ammo...

Embodiment 3

[0041] Low sulfur high tap density Ni 0.8 co 0.1 mn 0.1 (OH) 2 The preparation of ternary precursor, D50 is 11.5μm, TD is 2.31g / cc, S content is 1007ppm, the preparation process is as follows:

[0042] (1) According to Ni 0.8 co 0.1 mn 0.1 (OH) 2 The molar ratio of nickel, cobalt and manganese in the middle Weigh the weight of nickel sulfate, cobalt sulfate and manganese sulfate, add pure water to make a mixed solution, the total concentration of metal content in the mixed solution is 2.5mol / L; the concentration of the lye is 6.5mol / L , configure the concentration of ammonia water to be 25%.

[0043] (2) Use a 50L titanium reactor with controllable temperature and speed, add 10-13L pure water as the bottom liquid before starting the machine, start stirring to 798-805rpm, heat up to 45°C, add ammonia and lye, and adjust the pH value of the bottom liquid To 11.95~12.05, the ammonia value is 5~6g / L, after 1 hour of protective gas, the peristaltic pump of metal material li...

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Abstract

The invention discloses a preparation method of a nickel cobalt manganese ternary precursor with low sulfur and high tap density. The product prepared by the existing method cannot satisfy indexes ofhigh tap density and low sulfur content at the same time. Nickel cobalt manganese hydroxide is prepared by adopting an interval process with different stages of crystal nucleation and crystal growth;a PSP (reaction stopping-sedimentation performing-supernate removing-reaction starting) synthesis process is adopted in the crystal growth stage to improve compactness of the nickel cobalt manganese hydroxide granules and reduce unqualified materials; extra additive and extra reaction kettle quantity are not needed; low-concentration alkali liquid washing and drying are performed to obtain the nickel cobalt manganese ternary precursor with low sulfur and high tap density; and the prepared nickel cobalt manganese ternary precursor is 6-13[mu]m in D50, TD is greater than or equal to 2.30g / cc,andthe S content is less than or equal to 1,200ppm.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery ternary positive electrode material precursors, in particular to a method for preparing a nickel-cobalt-manganese ternary precursor with low sulfur and high tap density. Background technique [0002] As a new type of green and environment-friendly power supply, lithium-ion batteries are widely used in 3C, electric vehicles, electric tools and energy storage and other fields. The cathode material is the key material that determines the electrochemical performance of lithium-ion batteries. It is divided into lithium manganate, lithium nickelate, lithium cobaltate, lithium iron phosphate, ternary cathode materials, etc., among which ternary cathode materials are in terms of cost, energy density, It has excellent comprehensive performance in terms of cycle performance, discharge voltage, and thermal stability, and has gradually become the mainstream cathode material for lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 王娟邱天高炯信沈震雷朱玉华赵斌杰
Owner ZHEJIANG HUAYOU COBALT
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