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Lithium nickel manganese oxide material and preparation method thereof and lithium ion battery containing lithium nickel manganese oxide material

A lithium-nickel-manganese-oxygen and nickel-manganese technology, which is applied in the field of lithium-nickel-manganese-oxygen materials and their preparation, can solve the problems of low initial coulombic efficiency, low specific capacity, and poor cycle performance of lithium-ion batteries, and achieve excellent cycle performance and high performance ratio. The effect of high capacity and high rate performance

Active Publication Date: 2012-09-12
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the invention is to solve the aLiNi of the prior art 0.5 mn 1.5 o 4 ·(1-a)Li 2 MnO 3 ·(1-a)LiNi 0.5 mn 0.5 o 2 (a=0, 0.1, 0.15, 0.2, 0.3, 0.4) materials and lithium-ion batteries prepared from them have low first-time coulombic efficiency or low specific capacity and poor cycle performance, and provide an aLiNi 0.5 mn 1.5 o 4 ·(1-a)Li 2 MnO 3 ·(1-a)LiNi 0.5 mn 0.5 o 2 (0.6≤a≤0.7) material

Method used

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  • Lithium nickel manganese oxide material and preparation method thereof and lithium ion battery containing lithium nickel manganese oxide material
  • Lithium nickel manganese oxide material and preparation method thereof and lithium ion battery containing lithium nickel manganese oxide material
  • Lithium nickel manganese oxide material and preparation method thereof and lithium ion battery containing lithium nickel manganese oxide material

Examples

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Effect test

Embodiment 1

[0032] This embodiment provides a 0.62LiNi 0.5 mn 1.5 o 4 0.38 Li 2 MnO 3 0.38LiNi 0.5 mn 0.5 o 2 The method of preparation of the material, including:

[0033] Step 1. Preparation of precursor by co-precipitation

[0034] Prepare the aqueous solution of the mixture of nickel acetate and manganese nitrate according to the ratio of substance Ni:Mn=1:3, and add Na with a molar concentration of 0.5M to the mixed solution dropwise under stirring. 2 CO 3 solution to make Ni 2+ , Mn 2+ The precipitation was complete, and after standing for 2 hours, suction filtration, washing three times, and drying at 110° C. for 12 hours obtained the precursor nickel-manganese composite carbonate.

[0035] Step 2. Pretreatment of NiMn precursor

[0036] Lithium nitrate and Lithium Retard (both are 1: 1) and the precursor nickel-manganese composite carbonate are mixed to obtain a solid mixture by the amount ratio Li: Ni: Mn=3.463: 1: 3. The volatilization of Li during the treatment pro...

Embodiment 2

[0047] This embodiment provides a kind of 0.6LiNi 0.5 mn 1.5 o 4 0.4 Li 2 MnO 3 0.4LiNi 0.5 mn 0.5 o 2 Preparation method of material:

[0048] Step 1. Co-precipitation to prepare nickel-manganese precursor

[0049] According to the ratio of substance Ni:Mn=1:3, prepare nickel nitrate and nickel acetate (the ratio of substance of the two is 1:1), and the mixture aqueous solution of manganese sulfate is added dropwise to the mixed solution in a state of stirring. K at a concentration of 0.3M 2 CO 3 solution to make Ni 2+ , Mn 2+ The precipitation was complete, and after standing for 2 hours, suction filtration, washing three times, and drying at 110° C. for 12 hours obtained the precursor nickel-manganese composite carbonate.

[0050] Step 2. Pretreatment of NiMn precursor

[0051]Dry the nickel-manganese composite carbonate precursor obtained in step 1, sinter it in an air atmosphere, heat it up to 600°C at a heating rate of 10°C / min, keep it warm and sinter for 2...

Embodiment 3

[0059] This embodiment provides a kind of 0.61LiNi 0.5 mn 1.5 o 4 0.39 Li 2 MnO 3 0.39LiNi 0.5 mn 0.5 o 2 The method of preparation of the material, including:

[0060] Step 1. Co-precipitation to prepare nickel-manganese precursor

[0061] Prepare a mixture aqueous solution of nickel sulfate, manganese chloride and manganese sulfate (the ratio of the two substances is 1:1) according to the amount ratio of Ni:Mn=1:3, and add it dropwise to the mixed solution under stirring 2M NaHCO molarity 3 solution to make Ni 2+ , Mn 2+ The precipitation was complete, and after standing for 2 hours, suction filtration, washing three times, and drying at 110° C. for 12 hours obtained the precursor nickel-manganese composite carbonate.

[0062] Step 2. Pretreatment of NiMn precursor

[0063] Li:Ni:Mn=3.6312:1:3 according to the amount of substance ratio Lithium acetate and the precursor nickel-manganese composite carbonate are mixed to obtain a solid mixture; and the ratio of etha...

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Abstract

The invention provides a lithium nickel manganese oxide material and a preparation method thereof and a lithium ion battery containing the lithium nickel manganese oxide material, relates to the technical field of lithium ion batteries, and can solve the problems that the first coulomb efficiency or specific capacity of an existing lithium nickel manganese oxide material and a lithium ion battery prepared with the same is low and the cycle performance is poor. The lithium nickel manganese oxide material preparation method includes the following steps of precipitation to prepare a nickel manganese precursor, pretreatment of the precursor and solid phase synthesis. Proper process parameters are selected to obtain the lithium nickel manganese oxide material with good performance, so that the first coulomb efficiency, specific capacity and cycle performance of the lithium nickel manganese oxide material and the lithium ion battery prepared with the same are high. The lithium nickel manganese oxide material is prepared by the preparation method. The lithium ion battery comprises the lithium nickel manganese oxide material.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium nickel manganese oxide material, a preparation method thereof, and a lithium ion battery containing the material. Background technique [0002] In recent years, microelectronics and related technologies have developed rapidly. Modern society has higher and higher requirements for lithium-ion batteries in terms of energy density, volume, cycle life, and safety. General cathode materials such as LiCoO 2 , LiMn 2 o 4 、LiFePO 4 , ternary materials, etc. are increasingly unable to meet the needs of high-capacity, high-energy-density energy storage devices, and the layered lithium-rich cathode material xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Cr, Ni 1 / 3 co 1 / 3 mn 1 / 3 , Fe...) is a kind of α-NaFeO 2 type solid solution material, composed of layered Li 2 MnO 3 and LiMO 2 (M=Mn, Ni, Co, Ni 0.5 mn 0.5 , Fe...) formation, wi...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M10/0525C01G45/02C01G53/04C01D15/02
CPCY02E60/10
Inventor 刘三兵翟丽娟
Owner CHERY AUTOMOBILE CO LTD
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