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Single crystal nickel-cobalt-manganese lithium anode material, precursor and preparation methods for single crystal nickel-cobalt-manganese lithium anode material and precursor

A technology of nickel-cobalt-lithium-manganese-manganese-oxide and positive-electrode materials, which is applied in the field of precursors and their preparation, single-crystal doped multi-element nickel-cobalt-lithium-manganese-manganese-oxide positive-electrode materials, and can solve the effects of unfavorable positive-electrode materials on firing, morphology, and density, etc. problem, to achieve the effect that is beneficial to the formation of single crystal, small loose packing and tap density, and low density

Active Publication Date: 2019-03-12
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the large-particle spherical precursor is forcibly broken into small particles, the shape and density of the material will be affected to varying degrees, which is not conducive to the firing of the final cathode material

Method used

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  • Single crystal nickel-cobalt-manganese lithium anode material, precursor and preparation methods for single crystal nickel-cobalt-manganese lithium anode material and precursor
  • Single crystal nickel-cobalt-manganese lithium anode material, precursor and preparation methods for single crystal nickel-cobalt-manganese lithium anode material and precursor
  • Single crystal nickel-cobalt-manganese lithium anode material, precursor and preparation methods for single crystal nickel-cobalt-manganese lithium anode material and precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare 1.5mol / L nickel-cobalt-manganese sulfate mixed solution (molar ratio Ni:Co:Mn=50:20:30), 3mol / L NaOH solution, 3mol / L ammonia water, 10g / L PEG1000 dispersant aqueous solution , put the above solutions into the reaction kettle in parallel flow, keep the reaction temperature at 50°C, and the reaction pH value at 12.0. Under nitrogen protection atmosphere, wash, dry at 120°C, and sieve to obtain a loose morphology The small particle nickel cobalt manganese hydroxide precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 . Such as figure 1 As shown, the nickel-cobalt-manganese hydroxide is densely stacked in small plates, with low density and large specific surface area; test result D 50 5.5 μm, D max is 14.47μm, and the specific surface area is 12.92m 2 / g, bulk density AD is 0.86g / cm 3 , the tap density TD is 1.65 g / cm 3 .

[0046] The obtained nickel-cobalt lithium manganese oxide cathode material precursor, lithium carbonate, strontium carbonate, and magnesium oxide we...

Embodiment 2

[0048] Prepare 1.8mol / L nickel-cobalt nitrate mixed solution (molar ratio Ni:Co:Mn=63:17:20), 5mol / L NaOH solution, 5mol / L ammonia water, 5g / L polyvinyl alcohol dispersion The above-mentioned solutions are passed into the reaction kettle in parallel flow, the reaction temperature is set at 55°C, the pH value is 12.5, and the precipitation is carried out under the protection atmosphere of argon, washed, dried at 115°C, and sieved. Obtain a loose morphology of small particles of nickel cobalt lithium manganate cathode material precursor Ni 0.63 co 0.17 mn 0.2 (OH) 2 ;Such as image 3 As shown, the nickel-cobalt-manganese hydroxide is densely stacked in small plates, similar in appearance to Example 1, and slightly smaller in particle size; the D of the nickel-cobalt-manganese hydroxide is tested. 50 4.26μm, D max is 12.19μm, and the specific surface area is 18.75m 2 / g, bulk density AD is 0.82g / cm 3 , the tap density TD is 1.63 g / cm 3 .

[0049] The resulting nickel cob...

Embodiment 3

[0051] Prepare 2mol / L nickel-cobalt-manganese sulfate mixed solution (molar ratio Ni:Co:Mn=82:9:9), 8mol / L NaOH solution, 8mol / L ammonia water, 20g / L polyglycerol dispersant aqueous solution , the above-mentioned several solutions are passed into the reaction kettle in a co-current manner, the reaction temperature is set at 60°C, the pH value is 12.8, and the precipitation is carried out under a nitrogen protection atmosphere, washed, dried at 115°C, and sieved to obtain a loose form Small particle nickel cobalt lithium manganese oxide cathode material precursor Ni 0.82 co 0.09 mn 0.09 (OH) 2 . Such as Figure 5 As shown, the nickel-cobalt-manganese hydroxide is densely stacked in small pieces, and the particles are smaller, similar in appearance to Example 1, D 50 3.98 μm, D max is 9.93μm, and the specific surface area is 21.28m 2 / g, bulk density AD is 0.80g / cm 3 , the tap density TD is 1.51 g / cm 3 .

[0052] The obtained nickel cobalt manganese hydroxide precursor...

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Abstract

The invention discloses a single crystal nickel-cobalt-manganese lithium anode material, a precursor and preparation methods for the single crystal nickel-cobalt-manganese lithium anode material and the precursor. The molecular formula of the anode material is LiNi<x>Co<y>Mn<1-x-y>M'<z>M' ' <w>O<2-delta>R<delta>(a being greater than or equal to 0.95 and smaller than or equal to 1.25, x being greater than or equal to 0 and smaller than or equal to 1, y being greater than or equal to 0 and smaller than or equal to 0.5, z being greater than or equal to 0 and smaller than or equal to 0.01, w being greater than or equal to 0 and smaller than or equal to 0.05, delta being greater than or equal to 0 and smaller or equal to 0.02). By adding a dispersant and controlling the content of a co-precipitation reaction complexing agent, the synthesis pH value and the reaction temperature, a nickel-cobalt manganese hydroxide precursor with small particles, loose shape, small density and large specific surface area is obtained. A nickel-cobalt-manganese lithium anode material with typical single crystal shape is obtained by sintering the precursor with a lithium salt and a specific melting acceleration element additive. The invention has simple process, easy process control and no need for modification or addition to original devices. The obtained precursor is easy to react and combine with the lithium salt, which reduces the sintering temperature, simplifies the sintering process and greatly improves the production efficiency.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically relates to a single-crystal doped multi-element nickel-cobalt lithium manganate positive electrode material, a precursor and a preparation method thereof. Background technique [0002] Lithium-ion battery is a green high-energy battery with outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge, and no memory effect. It is widely used in various portable electric tools, electronic instruments, mobile phones, notebook computers, Camcorders, weaponry, etc. have also been used on a large scale in electric vehicles and various energy storage fields. [0003] The cathode material is one of the important components of the lithium-ion battery, and the quality of the cathode material directly determines the performance of the lithium-ion battery. Ternary nickel-cobalt lithium manganese oxide has high capacity, excellent cy...

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 孙立国宋顺林刘亚飞陈彦彬李建忠
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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