Lithium ion battery positive electrode material uniformly coated with MOF (Metal Organic Framework) and preparation method of lithium ion battery positive electrode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex preparation process, high cost, and difficulty in forming a uniform coating layer, and achieve high specific capacity, good Rate performance, the effect of improving electrochemical performance

Active Publication Date: 2022-03-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Oxide, fluoride, phosphate and other types of materials are used as cladding materials (Adv.Energy Mater.2019, 9, 1901597; Adv.Energy Mater. ; Energy

Method used

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  • Lithium ion battery positive electrode material uniformly coated with MOF (Metal Organic Framework) and preparation method of lithium ion battery positive electrode material
  • Lithium ion battery positive electrode material uniformly coated with MOF (Metal Organic Framework) and preparation method of lithium ion battery positive electrode material
  • Lithium ion battery positive electrode material uniformly coated with MOF (Metal Organic Framework) and preparation method of lithium ion battery positive electrode material

Examples

Experimental program
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Example Embodiment

[0029] A method of preparing a MOF uniformly coated lithium-ion battery positive material according to an embodiment of the present invention, such as figure 1 As shown, including the following steps:

[0030] (1) 2,5-dihydroxy terephthalic acid or a derivative thereof is added to the organic solvent, stirred for 10 to 20 minutes, resulting in 2,5-dihydroxy terephthalic acid solution, i.e., solution A;

[0031] (2) In the solution A of the lithium ion battery positive electrode particles, stirred at room temperature for 4 h to 8 h at room temperature to obtain a mixed liquid B; wherein the hydroxyl group on the 2,5-dihydroxy phthalic acid is positive and lithium ion battery. The residual base on the particles is bonded, then 2,5-dihydroxy terephthalic acid is coated on the surface of the positive particles of the lithium ion battery by a hydrogen bond;

[0032] (3) In the mixed liquid B of the mixture of the metal salt, stirred at room temperature for 16 h to 20 h, mixed liquid C;...

Example Embodiment

[0041] Example 1

[0042] A method of preparing a lithium ion battery having uniformly coated MOF, including the following steps:

[0043] (1) 25 ml of N, N-dimethylformamide was added to 50 ml of beaker, and 10.4 mg of 2,5-dihydroxy phthalic acid was added under conditions having a stirring speed of 500 r / min, and it was fully Dissolve, obtain solution A of 2,5-dihydroxy terephthalic acid.

[0044] (2) Under the mechanical stirring of 500r / min, the solution A obtained in step (1) is slowly added to 0.6 g of lithium manganese-rich positive electrode material (Li 1.2 Mn 0.54 CO 0.13 Ni 0.13 O 2 ), A mixture of 2,5-dihydroxy terephthalic acid packs is rumored to lithium manganese-based positive electrode material;

[0045] (3) Under the mixing liquid B obtained in the step (2), 10.6 mg of tetrahydrate magnesium glycetate is slowly added to the mixed liquid B obtained in step (2) to obtain a mixture C which is a lithium manganese positive electrode material.

[0046] (4) The mixt...

Example Embodiment

[0049] Example 2

[0050] A method of preparing a lithium ion battery having uniformly coated MOF, including the following steps:

[0051] (1) 25 ml of N, N-dimethylformamide was added to 50 ml of beaker, and 6.3 mg of 2,5-dihydroxyphthalic acid was added under conditions having a stirring speed of 500 r / min, and it was fully dissolved. To give 2,5-dihydroxy phthalic acid solution A;

[0052] (2) Under the mechanical stirring of 500r / min, the solution A obtained in step (1) is slowly added to 1.2 g of lithium manganese-rich manganese positive electrode material (Li 1.2 Mn 0.54 CO 0.13 Ni 0.13 O 2 ), A mixture of 2,5-dihydroxy terephthalic acid packs is rumored to lithium manganese-based positive electrode material;

[0053] (3) At 500 r / min, 6.7 mg of zirconium chloride is slowly added to the mixed liquid B obtained in step (2) to obtain a mixture of Zr-MOF lithium manganese positive electrode material.

[0054] (4) The mixture C was stirred at 40 ° C for 8 h;

[0055] (5) P...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly discloses an MOF uniformly coated lithium ion battery positive electrode material and a preparation method thereof, the preparation method comprises the following steps: S1, at room temperature, adding lithium ion battery positive electrode particles into a 2, 5-dihydroxy terephthalic acid solution to obtain a mixed solution, hydroxyl in the 2, 5-dihydroxy terephthalic acid is combined with residual alkali on the lithium ion battery positive electrode particles to form the lithium ion battery positive electrode particles coated with the 2, 5-dihydroxy terephthalic acid; and S2, adding a metal salt into the mixed solution, and reacting the 2, 5-dihydroxy terephthalic acid coated on the lithium ion battery positive electrode particles with metal ions to generate MOF, thereby obtaining the MOF uniformly coated lithium ion battery positive electrode material. The lithium ion battery positive electrode material uniformly coated with the MOF can be obtained through the preparation method, and the lithium ion battery positive electrode material has high specific capacity, good rate capability and stable cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and more specifically relates to a lithium ion battery positive electrode material uniformly coated with MOF and a preparation method thereof. Background technique [0002] As a material for providing lithium ions in lithium-ion batteries, the performance of positive electrode materials directly affects the performance and application of lithium-ion batteries. In recent years, lithium-rich manganese-based, ternary, and lithium cobalt oxide cathode materials with high energy density have attracted much attention, and they are favorable competitors for the next generation of commercial lithium-ion battery cathode materials. However, due to its high operating voltage and poor cycle stability, its further application is limited. [0003] So far, different methods have been used to improve the performance of lithium-rich manganese-based, ternary, and lithium cobalt oxide cathode materia...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08G83/00
CPCH01M4/62H01M4/628H01M10/0525C08G83/008Y02E60/10
Inventor 方淳王志昊韩建涛徐佳王鑫李琪
Owner HUAZHONG UNIV OF SCI & TECH
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