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Method for improving electrochemical properties of electrode material of lithium ion batteries

A lithium-ion battery and electrode material technology, which is applied in the field of improving the electrochemical performance of lithium-ion battery electrode materials, can solve the problems of large surface energy, difficult stable existence, and agglomeration of nanomaterials, so as to reduce large-scale industrialization, low cost, and The effect of simple process

Inactive Publication Date: 2017-08-25
ANQING NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nanomaterials lose their unique properties due to their large surface energy, difficulty in stable existence, and prone to spontaneous agglomeration.

Method used

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  • Method for improving electrochemical properties of electrode material of lithium ion batteries
  • Method for improving electrochemical properties of electrode material of lithium ion batteries
  • Method for improving electrochemical properties of electrode material of lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A kind of method of improving the electrochemical performance of lithium-ion battery electrode material of the present embodiment, comprises the steps:

[0034] (1) sodium dodecylbenzenesulfonate (SDBS) is dissolved in deionized water;

[0035] (2) The NH of the electrode material will be prepared 4 VO 3 、CH 3 COOLi·H 2 O, NH 4 h 2 PO 4 And complexing agent citric acid, maintain in the form of solid phase or aqueous solution under certain condition (pH, temperature, the drip rate of raw material and atmosphere protection) add in step (1) solution, form solution;

[0036](3) Heat and stir the solution in step (2) in a water bath at 60°C until it forms a sol, then transfer it to an oven at 120°C for drying to obtain a precursor;

[0037] (4) After grinding the precursor obtained in step (3) in 5% H 2 / N 2 After sintering at 350°C for 5 hours in an atmosphere tube furnace, cool to room temperature naturally;

[0038] (5) Grinding the sample processed in step (4);...

Embodiment 2

[0042] A kind of method of improving the electrochemical performance of lithium-ion battery electrode material of the present embodiment, comprises the steps:

[0043] (1) cetyltrimethylammonium bromide (CTAB) is dissolved in deionized water;

[0044] (2) The CH of the electrode material will be prepared 3 COOLi·H 2 O, (CH 3 COO) 2 Mn 4H 2 O, (CH 3 COO) 2 Ni·4H 2 O and auxiliary raw material ammonia water are maintained in the form of solid phase or aqueous solution under certain conditions (pH, temperature, drip rate and atmosphere protection of raw materials) and added in the solution of step (1) to form a solution;

[0045] (3) Transfer the solution of step (2) into a hydrothermal reaction kettle, react at 180°C for 24 hours to obtain a sol, then evaporate in a water bath at 70°C, and then transfer to an oven for drying at 120°C to obtain a precursor;

[0046] (4) Grinding the precursor obtained in step (3) and sintering it in a muffle furnace at 250°C for 1 hour; ...

Embodiment 3

[0051] A kind of method of improving the electrochemical performance of lithium-ion battery electrode material of the present embodiment, comprises the steps:

[0052] (1) polyvinyl alcohol (PVA) and cetyltrimethylammonium bromide (CTAB) are dissolved in deionized water;

[0053] (2) The CH of the electrode material will be prepared 3 COOLi·H 2 O, (CH 3 COO) 2 Co 6H 2 O and Precipitant Na 2 CO 3 Each was dissolved in deionized water, and each solution was added dropwise to the solution of step (1) under continuous stirring, adjusted with ammonia water to maintain pH = 10, continued to stir for 10 h after the addition, filtered, and washed with deionized water , get the precipitate;

[0054] (3) transferring the precipitate obtained in step (2) to a vacuum oven for vacuum drying to obtain a precursor;

[0055] (4) After grinding the precursor obtained in step (3) in 10% H 2 / N 2 Sintering at 600°C for 8 hours in an atmosphere tube furnace;

[0056] (5) Grinding the s...

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Abstract

The invention discloses a method for improving the electrochemical properties of an electrode material of lithium ion batteries, and the method comprises the following steps: dissolving a surfactant in deionized water; adding multiple salts and auxiliary raw materials to the solution; conducting treatment by a corresponding method and drying to obtain a precursor; grinding the precursor and pre-roasting the precursor at low temperature; conducting grinding; and conducting roasting at high temperature to obtain the corresponding electrode material to be used as an anode or an cathode for forming a lithium ion battery. The method has the following advantages: (1) the electrochemical properties of the material of lithium ion batteries are obviously improved; (2) the electrode material is prepared by the aid of the surfactant, the dispersity and uniformity of the material can be improved, so that the contact area between the material and electrolyte is increased, the ion transmission and electron transmission paths in the charge and discharge processes are shortened, and the cycle property, rate property and high-and-low temperature property of the electrode material are improved; (3) the cost is low; and (4) the method has a simple process, low equipment investment and a short period.

Description

technical field [0001] The invention relates to the field of chemical power sources, in particular to a method for improving the electrochemical performance of lithium-ion battery electrode materials. Background technique [0002] With the depletion of fossil fuels, the research on energy storage and conversion devices has attracted more and more attention. Lithium-ion batteries have become the most attractive secondary batteries due to their high energy density, long cycle life, and low self-discharge rate. However, the large-scale equipment required for power batteries and long-term energy storage requires lithium-ion batteries to have high rate performance, long-term stability, and high-temperature performance. These are problems that need to be solved urgently in the development of lithium-ion batteries. The preparation of electrode materials by solid-state sintering is convenient for large-scale production, but the material particles are easy to agglomerate, resulting ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 陈静娟何承东
Owner ANQING NORMAL UNIV
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