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Method for preparing lithium ion battery composite positive electrode material

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of complex operation and high cost, and achieve the effect of simple operation method, optimized material performance, and mild reaction conditions

Active Publication Date: 2018-08-07
成都芯曌科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Some researchers used Mn-Ni-Co-LDHs as precursors to prepare MnNiCo ternary oxides with different components, and then combined with LiOH to prepare positive electrode materials, but in the preparation process, the precursors need to be calcined at high temperatures to form layered metal oxides. As a cathode material, the operation is complicated and the cost is high

Method used

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  • Method for preparing lithium ion battery composite positive electrode material
  • Method for preparing lithium ion battery composite positive electrode material
  • Method for preparing lithium ion battery composite positive electrode material

Examples

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preparation example Construction

[0030] A preparation method of a lithium-ion battery composite positive electrode material, comprising the following steps:

[0031] Step 1. Prepare LiFePO by rheological phase method, hydrothermal method or solid phase method 4 Cathode material;

[0032] Step 2, the preparation of Ni-Al-Li-LDHs:

[0033] 2.1 Take soluble lithium salt, soluble nickel salt, and soluble aluminum salt as raw materials, weigh the above raw materials according to the ratio of molar ratio Li:Ni:Al=4:1:1 and dissolve them in deionized water, stir for more than 30min, mix well, A mixed solution A is obtained; wherein, the concentration of the soluble lithium salt is 0.1 to 0.3 mol / L;

[0034] 2.2 Add urea to the mixed solution A obtained in step 2.1 as a hydrolysis precipitant, stir for 3-8 hours, and mix uniformly to obtain a mixed solution B; wherein, the concentration of urea in the mixed solution B is 0.1-0.2 mol / L;

[0035] 2.3 Transfer the mixed liquid B obtained in step 2.2 to an autoclave, ...

Embodiment 1

[0049] A preparation method of a lithium-ion battery composite positive electrode material, comprising the following steps:

[0050] Step 1. Preparation of LiFePO 4 Cathode material:

[0051] 1.1. Weigh Li with a molar ratio of 1:1 2 CO 3 and FePO 4 The raw material is placed in a ball mill iron tank;

[0052] 1.2. Li placed in step 1.1 2 CO 3 and FePO 4 Stearic acid was added as a carbon source in an iron tank, and ethanol was used as a grinding aid in a high-energy ball mill for wet ball milling for 12 hours; wherein, the mass percent of the stearic acid in the total material was 2 wt %;

[0053] c. Dry the material obtained in the previous step at 80°C for 10 hours, then grind it into powder, pour it into a porcelain boat, and put it in a tube furnace, raise it from room temperature to 400°C under an argon atmosphere, and keep it warm 5h, and then raised to 600 ° C, heat preservation 8h, after the completion of the reaction, naturally cooled to room temperature with...

Embodiment 2

[0062] This embodiment is compared with embodiment 1, when step 3 is compounded, LiFePO 4 Positive electrode material: Ni-Al-Li-LDHs=85wt%: 15wt%, and the rest of the steps are the same as in Example 1.

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Abstract

The invention provides a method for preparing a lithium ion battery composite positive electrode material, and belongs to the technical field of preparation of lithium ion battery positive electrode materials. The method includes preparing Ni-Al-Li-LDHs with layered structure by the aid of a hydrothermal process; preparing a LiFePO4 positive electrode material by the aid of a rheological phase process, the hydrothermal process or a solid-phase process; introducing the Ni-Al-Li-LDHs with the layered structure into the LiFePO4 positive electrode material by the aid of a mechanical ball-milling mode. The method has the advantages that the purpose of optimizing the performance of the lithium ion battery composite positive electrode material can be achieved under mutual effect of the Ni-Al-Li-LDHs and a positive electrode active material, the traditional ion doping or carbon coating can be omitted, and important basis can be provided to research and application of the composite positive electrode material; the method is easy to operate, reaction conditions are mild, and high-temperature calcination treatment can be omitted.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium ion batteries, in particular to a layered metal hydroxide (Layered Double Hydroxides-LDHs) modified LiFePO 4 The preparation method of the obtained composite cathode material. Background technique [0002] Layered metal hydroxides (LDHs: layered double hydroxides) have a layered structure similar to brucite, which determines that it has good structural coordination. Metal atoms are highly dispersed within its structure, and the anions in the middle of the interlayer It is flexible and interchangeable. In addition, LDHs have a structural memory effect. When the layered structure collapses due to the decomposition of intercalated water and anions after high-temperature calcination, the layered structure can be restored by soaking the collapsed structure in its synthesis mother liquor. The flexible ion tunability, structural memory effect, and special layered st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58
CPCH01M4/366H01M4/5825Y02E60/10
Inventor 向勇张晓晴史家远张晓琨
Owner 成都芯曌科技有限公司