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Positive electrode active material precursor and preparation method thereof, and positive electrode active material

A cathode active material and precursor technology, applied in the field of cathode active material and cathode active material precursor, can solve the problems of reducing the comprehensive electrochemical performance of lithium-ion batteries, easy gas production, low capacity, etc.

Inactive Publication Date: 2020-07-03
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive active material synthesized by the existing high-nickel ternary positive active material precursor, or it has a high capacity, but the cycle performance is poor, and easy to produce gas; or its cycle performance is relatively high, and the gas production is relatively low. less, but the capacity is low; it makes it difficult for the positive electrode active material to have good comprehensive electrochemical performance, thereby reducing the comprehensive electrochemical performance of lithium-ion batteries

Method used

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  • Positive electrode active material precursor and preparation method thereof, and positive electrode active material
  • Positive electrode active material precursor and preparation method thereof, and positive electrode active material
  • Positive electrode active material precursor and preparation method thereof, and positive electrode active material

Examples

Experimental program
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Effect test

Embodiment 1

[0107] Preparation of positive electrode active material precursor

[0108] Nickel sulfate, cobalt sulfate, and manganese sulfate are configured into a mixed salt solution with a concentration of 1.5mol / L according to the molar ratio Ni:Co:Mn=8:1:1, and NaOH is configured into a precipitant solution with a concentration of 5mol / L. Aqueous ammonia with a concentration of 8 mol / L was used as complexing agent solution.

[0109] Add 10L deionized water to a 20L controlled crystallization reactor, add a certain amount of concentrated ammonia water to make the ammonia concentration 0.45mol / L-0.55mol / L, and add a certain amount of NaOH solution to make the pH 11.70-11.75 to obtain the bottom liquid.

[0110] in N 2 Under a protective atmosphere, heat the bottom liquid to 55°C and maintain it. At a stirring speed of 600rpm, add the mixed salt solution, precipitant solution, and complexing agent solution into the bottom liquid in parallel, wherein the flow rate of the mixed salt sol...

Embodiment 2

[0122] Different from Example 1, in the preparation of the positive electrode active material precursor:

[0123] Nickel sulfate, cobalt sulfate, and manganese sulfate are configured into a mixed salt solution with a concentration of 2.0mol / L according to the molar ratio Ni:Co:Mn=8:1:1, and NaOH is configured into a precipitant solution with a concentration of 3mol / L. Ammonia water with a concentration of 14mol / L was used as complexing agent solution.

[0124] Add 15L deionized water to a 20L controlled crystallization reactor, add a certain amount of concentrated ammonia water to make the ammonia concentration 0.15mol / L-0.25mol / L, and add a certain amount of NaOH solution to make the pH 11.15-11.25 to obtain the bottom liquid.

[0125] in N 2 Under a protective atmosphere, heat the bottom liquid to 55°C and maintain it. At a stirring speed of 800rpm, add the mixed salt solution, precipitant solution, and complexing agent solution into the bottom liquid in parallel, wherein t...

Embodiment 3

[0127] Different from Example 1, in the preparation of the positive electrode active material precursor:

[0128] Nickel sulfate, cobalt sulfate, and manganese sulfate are configured into a mixed salt solution with a concentration of 2.0mol / L according to the molar ratio Ni:Co:Mn=8:1:1, and NaOH is configured into a precipitant solution with a concentration of 5mol / L. Ammonia water with a concentration of 10mol / L was used as complexing agent solution.

[0129] Add 5L of deionized water to a 20L controlled crystallization reactor, add a certain amount of concentrated ammonia water to make the ammonia concentration 0.15mol / L-0.25mol / L, and add a certain amount of NaOH solution to make the pH 12.05-12.15 to obtain the bottom liquid.

[0130] in N 2 Under a protective atmosphere, heat the bottom liquid to 65°C and maintain it. At a stirring speed of 800rpm, add the mixed salt solution, precipitant solution, and complexing agent solution into the bottom liquid in parallel, wherein t...

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Abstract

The invention discloses a positive electrode active material precursor and a preparation method thereof, and a positive electrode active material. The positive electrode active material precursor comprises secondary particles formed by aggregation of a plurality of primary particles, each secondary particle comprises an internal area and an external area coating the external side of the internal area, the density of the internal area is smaller than that of the external area, and the density of the external area is gradually increased from inside to outside. According to the positive electrodeactive material precursor of the invention, the positive electrode active material adopting the positive electrode active material precursor has high initial charge specific capacity, initial discharge specific capacity, initial coulombic efficiency and cycle performance, so that the lithium ion secondary battery can have high initial charge specific capacity, initial discharge specific capacity,initial coulombic efficiency and cycle performance at the same time.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a positive electrode active material precursor, a preparation method thereof and a positive electrode active material. Background technique [0002] The positive active material has an important impact on the improvement of the energy density of lithium-ion batteries. Among them, the high-nickel ternary positive electrode active material has a high energy density, so it is expected to become the next-generation mainstream positive electrode active material for lithium-ion batteries. [0003] The performance of the high-nickel ternary positive electrode active material is largely affected by the performance of the precursor of the high-nickel ternary positive electrode active material. The positive active material synthesized by the existing high-nickel ternary positive active material precursor, or it has a high capacity, but the cycle performance is poor, and easy...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 刘良彬孙静何金华吴奇郑铮陈贵福吉长印
Owner CONTEMPORARY AMPEREX TECH CO
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