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Method for preparing anode material lithium nickle cobalt manganic acid of lithium ion battery

A technology for nickel-cobalt manganate lithium and lithium-ion batteries, which is applied in the field of new energy materials and preparation, can solve the problems of easy oxidation, difficulty in obtaining density, affecting the charge balance distribution of materials, etc., and achieves a high discharge voltage platform and an improved density. Effect

Inactive Publication Date: 2009-08-19
JILIN JIEN NICKEL IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the existing technologies that have been published, the co-deposition method can make the uniform doping of nickel-cobalt-manganese at the molecular level easier than the method of dry powder mixing and sintering, which is beneficial to finally obtain a uniform single-phase lithium nickel-manganese-cobalt oxide, but due to During codeposition synthesis, Co, especially Mn, is easily oxidized, and manganese is extremely easy to be synthesized from Mn 2+ converted to Mn 3+ or Mn 4+ Separation of nickel, cobalt and manganese, and the change of valence state of doping elements will also affect the growth of spheres, making it difficult to obtain greater density
During the sintering process of the precursor deposited with carbonate, the CO decomposed during sintering will also 2 Affects charge balance distribution in materials

Method used

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preparation example Construction

[0030] The preparation method of nickel cobalt lithium manganate lithium ion battery cathode material of the present invention mainly comprises the following steps:

[0031] 1) According to the molar ratio x:y:x, that is, 2x+y=1, nickel salt, cobalt salt, and manganese salt are prepared into a mixed solution with a metal content of 40-100g / L, wherein 0.1≤x≤0.4, 0.2 ≤y≤0.8, and satisfy 2x+y=1;

[0032] 2), preparation contains the sodium hydroxide solution of 2mol-6mol / L and the ammonia solution of 2-15mol / L;

[0033] 3), continuously inject the prepared nickel-cobalt-manganese salt mixed solution, sodium hydroxide solution, and ammonia solution into the reactor for stirring, adjust the ratio of the flow rate of the nickel-cobalt-manganese salt mixed solution to the ammonia flow rate, and control the NH 3 / (Ni+Co+Mn) molar ratio is between 0.4-1.5, while adjusting the flow rate of sodium hydroxide solution, controlling the pH value in the reactor to be kept between 8-11, and t...

Embodiment 1

[0044] Embodiment 1: a, solution preparation: use nickel sulfate (NiSO 4 ·7H 2 O), cobalt sulfate (CoSO 4 ·6H 2 O), manganese sulfate (MnSO 4 ·H 2 O) prepare the mixed solution of Ni+Co+Mn total molar number 1.2mol / L, make in the solution Ni:Co:Mn=1:1:1 (molar ratio); Prepare the sodium hydroxide solution of 6mol / L; Prepare 8mol / L NH 3 aqueous solution.

[0045] b. Add an appropriate amount of hydrazine water to the reactor every 30 minutes from the beginning of the reaction, and feed nitrogen into the reactor at the same time. Use a metering pump to inject the solution prepared in step a into the reactor with strong intensity respectively, fix the injection amount of the nickel-cobalt-manganese solution and the injection amount of ammoniacal liquor, and keep the NH 3 / (Ni+Co+Mn)=0.8. Regulate the injection rate of sodium hydroxide solution to keep the pH value in the reactor at 10.5. The temperature in the reactor was controlled at 55°C±1°C. Turn on the metering pu...

Embodiment 2

[0049] Example 2: Except that the nickel-cobalt-manganese mixed solution is prepared according to the ratio of Ni:Co:Mn=0.3:0.4:0.3, other process conditions are the same as in Example 1. The bulk density of nickel hydroxide cobalt manganese is 1.67g / cm 3 , tap density 2.38g / cm 3 . Spherical nickel-cobalt-manganese composite oxide, bulk density 1.73g / cm 3 , tap density 2.39g / cm 3 . The obtained spherical nickel-cobalt lithium manganese oxide has a normal distribution with a particle size of 5-28μm and a tap density of 2.75g / cm 3 . . The carbon material is used as the matching negative electrode to make the battery. The measured initial discharge capacity at room temperature is 165mAh / g, and the capacity above 3.6V at 0.2C accounts for 72% of the total capacity.

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Abstract

The invention relates to a preparation method of Ni-Co lithium manganate which is a cathode material for a lithium ion battery, which pertains to the field of new energy material and preparative technique. The preparation method comprises the following steps: 1. a sulfate mixture solution of nickel, cobalt and manganese is prepared in accordance with a certain concentration; 2. the mixture solution, NH3 water and a sodium hydroxide solution are continuously injected into a reactor and stirred, and a spherical or quasi-spherical multiple hydroxide A of Ni, Co and Mn is obtained after the filtration, washing and drying are conducted over the mixture; 3. the dry multiple hydroxide A of Ni, Co and Mn is presintered to obtain a spherical multiple oxide B of Ni, Co and Mn; and 4. after being added with a right quantity of alcohol, the product B is evenly mixed with lithium hydroxide and the mixture is sintered, smashed and screened to obtain a spherical LizNixCoyMnxO2 cathode material C for the lithium ion battery. With the preparation method, the particle size and distribution of the product A and product B are easy to control and the spherical Ni-Co lithium manganate C with stable quality, high density, high capacity and high discharge plateau is obtained; therefore, the preparation method is applicable to stabilizing industrial production.

Description

Technical field: [0001] The invention belongs to the technical field of new energy materials and preparation, and in particular relates to a cathode material for a lithium ion battery. Background technique [0002] In recent years, with the rapid development of small portable electric devices such as digital cameras, notebook computers, and mobile phones, the market strongly demands that the batteries that drive these devices have comprehensive performance such as small size, light weight, and high capacity. Lithium-ion secondary batteries have high discharge voltage and high energy density, so they have occupied the dominant position of small secondary batteries, and their market development space is extremely huge. [0003] The positive electrode battery material is an important part of the lithium-ion battery, which determines many key performances of the lithium-ion battery. The main materials currently studied are LiCoO 2 , LiNiO 2 , LiMnO 2 、LiFePO 4 and many othe...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58C01G53/00
CPCY02E60/12Y02E60/10
Inventor 赵泉赵才李维春袁凤艳
Owner JILIN JIEN NICKEL IND
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