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A method to manufacture precursor of nickel-cobalt-lithium-manganese-oxide of lithium ion cell anode material

A technology for nickel-cobalt lithium manganate and lithium-ion batteries, which is used in the preparation of nickel-cobalt lithium manganate precursors and the material field of making positive electrodes of lithium-ion batteries, which can solve the problem of low packing density, affecting industrialization, and no fixed shape problem, to achieve the effect of improving volume specific capacity, realizing industrialization and fast preparation

Active Publication Date: 2007-05-16
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of its disadvantages is that the three elements of nickel, cobalt, and manganese cannot be fully and uniformly mixed, so they cannot fully exert their respective effects.
The second is that the synthesized powder material is composed of irregular particles, has no fixed shape, and has a low bulk density. It is difficult to increase the volume specific capacity of the material, which hinders the practical application of the material.
Another method is the gel method. Although this method has its advantages, it is difficult to dry and remove water, which affects its industrialization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Experimental conditions: room temperature (25°C), ammonia concentration in the reactor 0.5mol / L, solid content 50g / L, pH=10.5, reactor 5L, mechanical stirring.

[0019] Solution preparation:

[0020] 1. Preparation of the first mixed solution: prepare a mixed solution of 0.3 mol / L cobalt nitrate, nickel nitrate, manganese nitrate and 0.5 mol / L ammonium nitrate.

[0021] 2. Preparation of the second mixed solution: prepare a mixed solution of 2.5 mol / L sodium hydroxide and 0.5 mol / L ammonia water.

[0022] 3. Solution preparation at the beginning of the reaction (bottom solution): prepare a solution with an ammonia concentration of 0.5 mol / L.

[0023] 4. Washing solution preparation: Add dissolved LiOH, NaOH or KOH concentrated solution to pure water to adjust the pH value to 10.5 to prepare for the precipitation of hydroxide generated after the washing reaction.

[0024] Take 1L of the prepared bottom solution and add it into the reactor, start the stirrer to stir. A...

Embodiment 2

[0026] Experimental conditions: room temperature (25°C), ammonia concentration in the reactor 0.5mol / L, solid content 100g / L, pH=10.5, reactor 5L, mechanical stirring.

[0027] Solution preparation:

[0028]1. Preparation of the first mixed solution: prepare a mixed solution of 0.6 mol / L cobalt nitrate, nickel nitrate, manganese nitrate and 0.5 mol / L ammonium nitrate.

[0029] 2. Preparation of the second mixed solution: prepare a mixed solution of 5 mol / L sodium hydroxide and 0.5 mol / L ammonia water.

[0030] 3. Solution preparation at the beginning of the reaction (bottom solution): prepare a solution with an ammonia concentration of 0.5 mol / L.

[0031] 4. Washing liquid preparation: add dissolved LiOH or NaOH concentrated solution to pure water, adjust the pH value to 10.5, in order to prepare for the precipitation of hydroxide generated after the washing reaction.

[0032] Take 1L of the prepared bottom solution and add it into the reactor, start the stirrer to stir. Ad...

Embodiment 3

[0034] Experimental conditions: room temperature (25°C), system ammonia concentration 0.5mol / L, solid content 50g / L, PH=12, reactor 5L, mechanical stirring.

[0035] Solution preparation:

[0036] 1. Preparation of the first mixed solution: prepare a mixed solution of 0.3 mol / L cobalt nitrate, nickel nitrate, manganese nitrate and 0.5 mol / L ammonium nitrate.

[0037] 2. Preparation of the second mixed solution: prepare a mixed solution of 2.5 mol / L sodium hydroxide and 0.5 mol / L ammonia water.

[0038] 3. Solution preparation at the beginning of the reaction (bottom solution): prepare a solution with an ammonia concentration of 0.5 mol / L.

[0039] 4. Washing liquid preparation: add dissolved LiOH or NaOH concentrated solution to pure water, adjust the pH value to 10.5, in order to prepare for the precipitation of hydroxide generated after the washing reaction.

[0040] Take 1L of the prepared bottom solution and add it into the reactor, start the stirrer to stir. Add the fi...

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Abstract

The related preparation method for Li1.05NixCoyMn(1-x-y)O2 precursor for Li-ion cell anode material comprises: a. preparing the first mixed solution with nitrates of Ni, Co and Mn, and some NH4NO3; b. adding proper NH3H2O into the cooled NaOH solution to form the second mixed solution, and adding NH3H2O into the a little pure water in reactor as base solution; c. adding continually mixed solution into the base solution for stirring; d. cleaning the hydroxide deposition by LiOH, NaOH or KOH, while controlling pH value in 10-10.5; e. drying deposition in oven. This invention is convenient to control and prepare fit to industrial production.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a preparation method of a precursor of nickel cobalt lithium manganese oxide, which is a material for making the positive electrode of the lithium ion battery. Background technique [0002] Currently, although LiCoO 2 Lithium-ion secondary batteries produced for positive electrode materials have become green high-energy batteries due to their high voltage, high energy density, good cycle performance, small self-discharge, and wide operating temperature range. They have been used in mobile phones, computers, digital Cameras, video cameras, instruments, meters, electric tools, electric bicycles, electric vehicles, defense weapons and other fields have been widely used, but due to the commercialized LiCoO 2 Cobalt in (lithium cobalt oxide) materials is scarce and toxic in geological resources, and it is difficult to develop and the price is high. Therefore, it is the direction and pursuit o...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58H01M4/48C01G1/02C01D15/00
CPCY02E60/12Y02E60/10
Inventor 肖峰程堂利
Owner BYD CO LTD
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