A kind of lithium ion battery manganese cobalt lithium oxide cathode material and preparation method thereof

A battery manganese cobalt lithium, positive electrode material technology, applied in the direction of battery electrodes, cobalt oxide/cobalt hydroxide, circuits, etc., can solve the electrochemical performance deterioration of positive electrode materials, poor repeatability of the coprecipitation process, and is not conducive to product uniformity and other problems , to achieve excellent electrochemical performance, easy to control, and save production costs

Active Publication Date: 2016-06-29
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Although the traditional co-precipitation method (using NaOH as the precipitating agent) has many advantages, it still has great shortcomings.
For example: (1) the process of preparing the transition metal hydroxide precursor first and then mixing it with lithium salt not only complicates the production, but also is not conducive to the uniformity of the product; (2) in order to form the transition metal co-precipitate, it has to be Adding a precipitant under the condition of gas protection complicates the production, increases the production cost, and is not conducive to large-scale production; (3) the different supersaturation between the transition metal hydroxides leads to the phase composition of the precursor fluctuations, making the repeatability of the coprecipitation process poor; (4) using NaOH as the precipitant inevitably introduces impurity ions——NaOH + , which improves the water absorption of the product and deteriorates the electrochemical performance of the positive electrode material

Method used

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  • A kind of lithium ion battery manganese cobalt lithium oxide cathode material and preparation method thereof
  • A kind of lithium ion battery manganese cobalt lithium oxide cathode material and preparation method thereof
  • A kind of lithium ion battery manganese cobalt lithium oxide cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1: Li 1.2 Mn 0.4 Co 0.4 O 2 Positive electrode material

[0024] Taking lithium acetate, manganese acetate, cobalt acetate and oxalic acid as starting materials, dissolving 0.9804g manganese acetate, 0.9964g cobalt acetate and 1.2855g lithium acetate in absolute ethanol to obtain a metal salt solution of ethanol; 2.1634g of excess 20% oxalic acid was dissolved in absolute ethanol; the ethanolic solution of oxalic acid was added to the metal salt solution of ethanol, stirred for 1 hour, filtered with suction, dried at 100°C for 3 hours, and ground into powder and put into a crucible; The furnace was heated to 900°C for 12h at a heating rate of 4°C / min, and then annealed at room temperature to obtain Li. 1.2 Mn 0.4 Co 0.4 O 2 powder material. The XRD test results of the powder material show that the synthesized powder has a layered rock-salt structure (R3m), such as figure 1 shown. The SEM test results of the powder materials show that the synthesized po...

Embodiment 2

[0025] Example 2: Li 1.033 Mn 0.067 Co 0.9 O 2 Positive electrode material

[0026] Taking lithium acetate, manganese acetate, cobalt acetate and oxalic acid as starting materials, dissolving 0.3270g manganese acetate, 4.4836g cobalt acetate and 2.5305g lithium acetate in absolute ethanol to obtain a metal salt solution of ethanol; 4.8021g of excess 20% oxalic acid was dissolved in absolute ethanol; the ethanolic solution of oxalic acid was added to the ethanolic metal salt solution, stirred for 1 hour, filtered with suction, dried at 100°C for 3 hours, ground into powder and put into a crucible; The furnace was heated to 900°C for 12h at a heating rate of 4°C / min, and then annealed at room temperature to obtain Li. 1.033 Mn 0.067 Co 0.9 O 2 powder material. The XRD test results of the powder material show that the synthesized powder has a layered rock-salt structure (R3m). The SEM test results of the powder materials show that the synthesized powder particles are uni...

Embodiment 3

[0027] Example 3: Li 1.1 Mn 0.2 Co 0.7 O 2 Positive electrode material

[0028] Taking lithium acetate, manganese acetate, cobalt acetate and oxalic acid as starting materials, 0.9804g manganese acetate, 3.4873g cobalt acetate and 2.4689g lithium acetate are dissolved in absolute ethanol to obtain a metal salt solution of ethanol; 6.3842g of excess 20% oxalic acid was dissolved in absolute ethanol; the ethanolic solution of oxalic acid was added to the metal salt solution of ethanol, stirred for 1 hour, filtered with suction, dried at 100°C for 3 hours, ground into powder and put into a crucible; The furnace was heated to 900°C for 12h at a heating rate of 4°C / min, and then annealed at room temperature to obtain Li. 1.1 Mn 0.2 Co 0.7 O 2 powder material. The XRD test results of the powder material show that the synthesized powder has a layered rock-salt structure (R3m). The SEM test results of the powder materials show that the synthesized powder particles are uniform...

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Abstract

The invention discloses a cathode material of manganese, cobalt and lithium oxidate for a lithium ion battery and a preparation method of the cathode material. The chemical formula of the cathode material is as follow: Li(3+x) / 3Mn2x / 1-xO2, wherein x is larger than or equal to 0.1 and is less than or equal to 0.9. The cathode material has excellent electrochemistry performances of high specific capacity, applicability of high temperature and low temperature, and the like. The preparation method is characterized by simplicity in operation, low manufacturing cost, short synthesis period, high repeatability and the like; no foreign ion is introduced, so that the purity of the product is greatly improved; lithium ions and transitional metal ions settle together, so that all the ions are mixed more uniformly; and the method can be extensively applied to synthesis of cathode material of oxidate for the lithium ion battery.

Description

technical field [0001] The invention relates to a manganese cobalt lithium oxide positive electrode material in the field of lithium ion batteries and a preparation method thereof. The chemical formula of the positive electrode material can be expressed as: Li (3+x) / 3 Mn 2x / 3 Co 1-x O 2 , where 0.1≤x≤0.9. Background technique [0002] Due to the advantages of high voltage, high capacity, long cycle life, good safety performance, and environmental protection, lithium-ion batteries have been widely used in portable electronic equipment, power units, aerospace, space technology and other fields. The co-precipitation method has great advantages in the synthesis of transition metal oxide cathode materials for lithium ion batteries: (1) the product particles are uniformly dispersed and the particle size distribution is uniform; (2) the process is simple, easy to control, and easy to scale Production; (3) Simple requirements for production equipment and low production costs. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/04H01M4/505H01M4/525
CPCY02E60/10
Inventor 李莉萍罗冬余创关翔锋李广社
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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