A kind of preparation method of linixmn2-xo4 cathode material

Abstract

The invention relates to a preparation method of a LiNi<x>Mn<2-x>O<4> cathode material, and belongs to the technical field of lithium-ion battery cathode materials. The method comprises the following steps: firstly, carrying out ball-mill mixing on a lithium source, a nickel source, a manganese source and an assistant for 0.5-10 hours, and drying the mixture at 60-160 DEG C to prepare a precursor, wherein at least one of the lithium source, the nickel source, the manganese source and the assistant is chloride; and secondly, heating the obtained precursor in air or oxygen atmosphere to 500-800 DEG C at the rate of 1-20 DEG C / min, heating the precursor at constant temperature for 5-48 hours, and cooling the precursor to room temperature to obtain the product LiNi<x>Mn<2-x>O<4> cathode material, or washing and drying the precursor to obtain the LiNi<x>Mn<2-x>O<4> cathode material. According to the method, a raw material chlorination process is provided; and through introducing chloride ions, the LiNi<x>Mn<2-x>O<4> (x is less than or equal to 0.5 and greater than or equal to 0.4) material in the solid-solid reaction process is promoted to grow up and expose a {111} crystal plane at low temperature, so that preparation of the high-performance LiNi<x>Mn<2-x>O<4> (x is less than or equal to 0.5 and greater than or equal to 0.4) material can be simply and effectively achieved.

Description

technical field

[0001] The present invention relates to a kind of LiNi x mn 2-x o 4 The invention discloses a method for preparing positive electrode materials, belonging to the technical field of lithium ion battery positive electrode materials. Background technique

[0002] Lithium-ion batteries have attracted widespread attention due to their advantages such as high voltage, large specific capacity, long cycle life, small self-discharge, no memory effect, and low environmental pollution, and have become an effective solution to alleviate energy crisis and environmental pollution. way. With the application of lithium-ion batteries in electric tools, electric vehicles and other fields, higher requirements are placed on the energy density of batteries, and the energy density of lithium-ion batteries depends largely on the positive electrode material, and the specific capacity of the positive electrode material is increased. Or voltage is one of the main ways to obtain hi...

Examples

Embodiment 1

[0022] The LiNi 0.5 mn 1.5 o 4 The preparation method of cathode material, its specific steps are as follows:

[0023] (1) First, ball mill and mix the lithium source, nickel source, manganese source and auxiliary agent for 1 hour, and then o The precursor is prepared by drying under C conditions, wherein the molar ratio of the lithium source, the nickel source and the manganese source is 1.0:0.5:1.5, and at least one of the lithium source, the nickel source, the manganese source and the auxiliary agent is a chloride; wherein the lithium The source is LiCl·H 2 O, 0.1mol; Ni source is NiCl 2 ·6H 2 O, 0.05 mol; manganese source is MnCl 2 4H 2 O, 0.15mol; auxiliary agent is oxalic acid, 0.3mol;

[0024] (2) The precursor obtained in step (1) was pressed at 20 o C / min rate heating up to 500 o C is heated at constant temperature for 10h, then cooled to room temperature, and the product after cooling is LiNi 0.5 mn 1.5 o 4 Cathode material.

[0025] Comparative test (r...

Embodiment 2

[0031] The LiNi 0.5 Mn 1.5 O 4 The preparation method of positive electrode material, its specific steps are as follows:

[0032] (1) First, the lithium source, nickel source, manganese source and auxiliary agent are ball-milled and mixed for 3h, and then at 100 o The precursor is prepared by drying under the condition of C, wherein the molar ratio of lithium source, nickel source and manganese source is 1.0:0.5:1.5, and at least one of lithium source, nickel source, manganese source and auxiliary agent is chloride; wherein lithium source The source is LiOH·H 2 O, 0.1 mol; Ni source is NiO, 0.05 mol; Manganese source is MnCl 2 ·4H 2 O, 0.15 mol; auxiliary agent is oxalic acid, 0.25 mol;

[0033] (2) Press the precursor obtained in step (1) to press 10 in an air atmosphere o C / min rate ramp up to 600 o C constant temperature heating for 10h, then cooled to room temperature, the product after cooling is LiNi 0.5 Mn 1.5 O 4 positive electrode material.

Embodiment 3

[0035] The LiNi 0.5 Mn 1.5 O 4 The preparation method of positive electrode material, its specific steps are as follows:

[0036] (1) First, the lithium source, nickel source, manganese source and auxiliary agent are ball-milled and mixed for 3h, and then at 80 o The precursor is prepared by drying under the condition of C, wherein the molar ratio of lithium source, nickel source and manganese source is 1.0:0.5:1.5, and at least one of lithium source, nickel source, manganese source and auxiliary agent is chloride; wherein lithium source Source is Li 2 CO 3 , 0.05mol; nickel source is NiO, 0.05mol; manganese source is MnCl 2 ·4H 2 O, 0.15 mol; auxiliary agent is ammonium oxalate, 0.15 mol;

[0037] (2) Press the precursor obtained in step (1) to press 20 in an air atmosphere o C / min rate ramp up to 700 o C constant temperature heating for 10h, then cooled to room temperature, the product after cooling is LiNi 0.5 Mn 1.5 O 4 positive electrode material.

technical field

[0001] The present invention relates to a kind of LiNi x mn 2-x o 4 The invention discloses a method for preparing positive electrode materials, belonging to the technical field of lithium ion battery positive electrode materials. Background technique

[0002] Lithium-ion batteries have attracted widespread attention due to their advantages such as high voltage, large specific capacity, long cycle life, small self-discharge, no memory effect, and low environmental pollution, and have become an effective solution to alleviate energy crisis and environmental pollution. way. With the application of lithium-ion batteries in electric tools, electric vehicles and other fields, higher requirements are placed on the energy density of batteries, and the energy density of lithium-ion batteries depends largely on the positive electrode material, and the specific capacity of the positive electrode material is increased. Or voltage is one of the main ways to obtain hi...

Examples

Embodiment 1

[0022] The LiNi 0.5 mn 1.5 o 4 The preparation method of cathode material, its specific steps are as follows:

[0023] (1) First, ball mill and mix the lithium source, nickel source, manganese source and auxiliary agent for 1 hour, and then o The precursor is prepared by drying under C conditions, wherein the molar ratio of the lithium source, the nickel source and the manganese source is 1.0:0.5:1.5, and at least one of the lithium source, the nickel source, the manganese source and the auxiliary agent is a chloride; wherein the lithium The source is LiCl·H 2 O, 0.1mol; Ni source is NiCl 2 ·6H 2 O, 0.05 mol; manganese source is MnCl 2 4H 2 O, 0.15mol; auxiliary agent is oxalic acid, 0.3mol;

[0024] (2) The precursor obtained in step (1) was pressed at 20 o C / min rate heating up to 500 o C is heated at constant temperature for 10h, then cooled to room temperature, and the product after cooling is LiNi 0.5 mn 1.5 o 4 Cathode material.

[0025] Comparative test (r...

Embodiment 2

[0031] The LiNi 0.5 Mn 1.5 O 4 The preparation method of positive electrode material, its specific steps are as follows:

[0032] (1) First, the lithium source, nickel source, manganese source and auxiliary agent are ball-milled and mixed for 3h, and then at 100 o The precursor is prepared by drying under the condition of C, wherein the molar ratio of lithium source, nickel source and manganese source is 1.0:0.5:1.5, and at least one of lithium source, nickel source, manganese source and auxiliary agent is chloride; wherein lithium source The source is LiOH·H 2 O, 0.1 mol; Ni source is NiO, 0.05 mol; Manganese source is MnCl 2 ·4H 2 O, 0.15 mol; auxiliary agent is oxalic acid, 0.25 mol;

[0033] (2) Press the precursor obtained in step (1) to press 10 in an air atmosphere o C / min rate ramp up to 600 o C constant temperature heating for 10h, then cooled to room temperature, the product after cooling is LiNi 0.5 Mn 1.5 O 4 positive electrode material.

Embodiment 3

[0035] The LiNi 0.5 Mn 1.5 O 4 The preparation method of positive electrode material, its specific steps are as follows:

[0036] (1) First, the lithium source, nickel source, manganese source and auxiliary agent are ball-milled and mixed for 3h, and then at 80 o The precursor is prepared by drying under the condition of C, wherein the molar ratio of lithium source, nickel source and manganese source is 1.0:0.5:1.5, and at least one of lithium source, nickel source, manganese source and auxiliary agent is chloride; wherein lithium source Source is Li 2 CO 3 , 0.05mol; nickel source is NiO, 0.05mol; manganese source is MnCl 2 ·4H 2 O, 0.15 mol; auxiliary agent is ammonium oxalate, 0.15 mol;

[0037] (2) Press the precursor obtained in step (1) to press 20 in an air atmosphere o C / min rate ramp up to 700 o C constant temperature heating for 10h, then cooled to room temperature, the product after cooling is LiNi 0.5 Mn 1.5 O 4 positive electrode material.

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