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Chromium-doped lithium-nickel-manganese-oxygen material and preparation method thereof, and lithium ion battery containing chromium-doped lithium-nickel-manganese-oxygen material

A lithium-nickel-manganese-oxygen and chromium-doped technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of low cycle performance of lithium-ion batteries, and achieve the effects of easy industrial production, low cost, and improved cycle performance

Active Publication Date: 2012-08-15
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low cycle performance of existing lithium nickel manganese oxide materials and lithium ion batteries prepared therefrom, and to provide a preparation method of chromium-doped lithium nickel manganese oxide materials

Method used

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  • Chromium-doped lithium-nickel-manganese-oxygen material and preparation method thereof, and lithium ion battery containing chromium-doped lithium-nickel-manganese-oxygen material
  • Chromium-doped lithium-nickel-manganese-oxygen material and preparation method thereof, and lithium ion battery containing chromium-doped lithium-nickel-manganese-oxygen material
  • Chromium-doped lithium-nickel-manganese-oxygen material and preparation method thereof, and lithium ion battery containing chromium-doped lithium-nickel-manganese-oxygen material

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Experimental program
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Effect test

Embodiment 1

[0029] This embodiment provides a LiNi 0.45 Cr 0.1 mn 1.45 o 4 The preparation method of material, it comprises the following steps:

[0030] Step 1. Preparation of precursor Ni by co-precipitation method 0.45 Cr 0.1 mn 1.45 (OH) 4 step:

[0031] According to the amount ratio of substances Ni: Cr: Mn=0.45: 0.1: 1.45, prepare the mixture aqueous solution of nickel chloride, chromium sulfate, manganese nitrate, under stirring state, add the NaOH solution that the molar concentration is 2M in the mixture aqueous solution, Control the pH value of the mixed solution at 12.6 to ensure that the Ni 2+ 、Cr 3+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 120 °C for 12 hours to obtain the precursor Ni 0.45 Cr 0.1 mn 1.45 (OH) 4 .

[0032] Step 2. Mixing steps:

[0033] According to the amount ratio of the substance Li:Ni:Cr:Mn=1.02:0.45:0.1:1.45, the mixture of lithium nitrate and lithium carbona...

Embodiment 2

[0042] This embodiment provides a LiNi 0.49 Cr 0.02 mn 1.49 o 4 The preparation method of material, it comprises the following steps:

[0043] Step 1. Preparation of precursor Ni by co-precipitation method 0.49 Cr 0.02 mn 1.49 (OH) 4 step:

[0044] According to the ratio of substance Ni:Cr:Mn=0.49:0.02:1.49, prepare the mixture aqueous solution of nickel sulfate and nickel nitrate (the ratio of the two substances is 1:1), chromium acetate and manganese chloride, under stirring , add dropwise a NaOH solution with a molar concentration of 2M to the aqueous solution of the mixture, and control the pH value of the mixed solution at 12.9 to ensure that Ni 2+ 、Cr 3+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 120 °C for 12 hours to obtain the precursor Ni 0.49 Cr 0.02 mn 1.49 (OH) 4 .

[0045] Step 2. Mixing steps:

[0046] Lithium acetate and the precursor Ni 0.49 Cr 0.02 mn 1.49 (OH) ...

Embodiment 3

[0053] This embodiment provides a LiNi 0.4 Cr 0.2 mn 1.4 o 4 The preparation method of material, it comprises the following steps:

[0054] Step 1. Preparation of precursor Ni by co-precipitation method 0.4 Cr 0.2 mn 1.4 (OH) 4 step:

[0055] According to the ratio of substance Ni:Cr:Mn=0.4:0.2:1.4, prepare the mixture aqueous solution of nickel acetate, chromium nitrate and chromium sulfate (the ratio of the substance of the two is 1:1), and manganese sulfate. Add dropwise a KOH solution with a molar concentration of 2M to the aqueous solution of the mixture, and control the pH value of the mixed solution at 12.8 to ensure that Ni 2+ 、Cr 3+ , Mn 2+ The precipitation is complete, after standing for 2 hours, suction filtration, washing three times, and drying at 120 °C for 12 hours to obtain the precursor Ni 0.4 Cr 0.2 mn 1.4 (OH) 4 .

[0056] Step 2. Mixing steps:

[0057] Lithium carbonate and the precursor Ni 0.4 Cr 0.2 mn 1.4 (OH) 4 Mix to obtain a solid...

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Abstract

The invention provides a chromium-doped lithium-nickel-manganese-oxygen material and a preparation method thereof, and a lithium ion battery containing the chromium-doped lithium-nickel-manganese-oxygen material, which belong to the field of the lithium ion batteries and are used for solving the problem of low cycle performance of the conventional lithium-nickel-manganese-oxygen anode material and a lithium ion battery prepared from the same. The preparation method of the chromium-doped lithium-nickel-manganese-oxygen material comprises a step for preparing nickel chromium manganese oxygen serving as a precursor through a co-precipitation, a step for mixing, and a three-stage sintering step. In the method, the precursor nickel chromium manganese oxygen material is prepared through the co-precipitation method, the precursor is mixed with a lithium source, and a mixture obtained by mixing is subjected to the three-stage sintering treatment to obtain the chromium-doped lithium-nickel-manganese-oxygen material with high performance, so that the cycle performance of the chromium-doped lithium-nickel-manganese-oxygen material and the lithium ion battery prepared from the material is greatly improved. The chromium-doped lithium-nickel-manganese-oxygen material is prepared by using the method. The lithium ion battery comprises the chromium-doped lithium-nickel-manganese-oxygen material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a chromium-doped lithium nickel manganese oxide material, a preparation method thereof, and a lithium ion battery containing the material. Background technique [0002] In recent years, with the increasingly severe energy and environmental problems and the requirement of light weight electronic products, researchers have continued to deepen their research on lithium-ion batteries. Since the commercial lithium-ion battery cathode material LiCoO 2 Due to its high price and toxicity, researchers have been working hard to find alternatives. Lithium manganese oxide has attracted much attention because of its low price and non-toxicity. LiNi containing nickel 0.5 mn 1.5 o 4 During the charge and discharge process, there is mainly a 4.7V platform, corresponding to Ni 2+ / Ni 4+ Oxidation-reduction process, and a very small 4V plateau, corresponding to Mn ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 刘三兵
Owner CHERY AUTOMOBILE CO LTD
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