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Coated nickel phosphate lithium anode material doped by copper and magnesium for lithium battery, and preparation method

A technology for coating lithium nickel phosphate and positive electrode materials, which is applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve the problem of unsatisfactory charge-discharge specific capacity and cycle performance, decreased specific capacity and cycle performance, and poor ionic conductivity. and other problems, to achieve the effect of improving electrochemical performance, improving high-rate performance, and improving electrochemical performance

Active Publication Date: 2019-04-12
扬州虹途电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the composite material prepared by this invention is used in lithium batteries, there are defects in the charge-discharge specific capacity and cycle performance at high rates.
[0007] In summary, the lithium nickel phosphate cathode material has the disadvantages of poor ionic conductivity, serious decline in specific capacity and cycle performance at high rates, so a lithium lithium phosphate cathode material with high conductivity and good cycle stability at high rates has been developed. , is of great significance

Method used

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  • Coated nickel phosphate lithium anode material doped by copper and magnesium for lithium battery, and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Prepare a mixed solution of cetyltrimethylammonium bromide, ethanol, and deionized water, add lithium hydroxide and stir to dissolve, then add ammonium dihydrogen phosphate, nickel sulfate, magnesium sulfate, copper sulfate, and stir Evenly, transferred to a hydrothermal reaction kettle, heated to 123°C for 4.5h in a sealed state, then passed nitrogen gas, raised to 176°C and continued to react for 1.5h, then cooled, discharged, suction filtered, washed, and vacuum-dried. A copper-magnesium-doped lithium nickel phosphate material is obtained; in the mixed solution, the molar ratio of cetyltrimethylammonium bromide, ethanol, and deionized water is 2:50:55; lithium hydroxide, ammonium dihydrogen phosphate The molar ratio of nickel sulfate, magnesium sulfate and copper sulfate is 1.14:1:0.8:0.1:0.1; the temperature of vacuum drying is 48°C, and the time is 9h;

[0032] (2) Add carboxymethyl cellulose to deionized water, heat and stir until completely dissolved, then ad...

Embodiment 2

[0035] (1) Prepare a mixed solution of cetyltrimethylammonium bromide, ethanol, and deionized water, add lithium hydroxide and stir to dissolve, then add ammonium dihydrogen phosphate, nickel sulfate, magnesium sulfate, copper sulfate, and stir Evenly, transferred to a hydrothermal reaction kettle, heated to 121°C for 5 hours in a sealed state, then passed nitrogen gas, raised to 172°C and continued to react for 2 hours, then cooled, discharged, suction filtered, washed, and vacuum-dried to obtain Lithium nickel phosphate material doped with copper and magnesium; in the mixed solution, the molar ratio of cetyltrimethylammonium bromide, ethanol, and deionized water is 1:40:45; lithium hydroxide, ammonium dihydrogen phosphate, sulfuric acid The molar ratio of nickel, magnesium sulfate, and copper sulfate is 1.1:1:0.85:0.05:0.1; the temperature of vacuum drying is 45°C, and the time is 9.5h;

[0036] (2) Add carboxymethyl cellulose to deionized water, heat and stir until complete...

Embodiment 3

[0039] (1) Prepare a mixed solution of cetyltrimethylammonium bromide, ethanol, and deionized water, add lithium hydroxide and stir to dissolve, then add ammonium dihydrogen phosphate, nickel sulfate, magnesium sulfate, copper sulfate, and stir uniform, transferred to a hydrothermal reaction kettle, heated to 14°C for 4 hours in a sealed state, then passed nitrogen gas, raised to 178°C and continued to react for 1 hour, then cooled, discharged, suction filtered, washed, and vacuum-dried to obtain Lithium nickel phosphate material doped with copper and magnesium; in the mixed solution, the molar ratio of cetyltrimethylammonium bromide, ethanol, and deionized water is 3:60:65; lithium hydroxide, ammonium dihydrogen phosphate, sulfuric acid The molar ratio of nickel, magnesium sulfate, and copper sulfate is 1.2:1:0.65:0.2:0.15; the temperature of vacuum drying is 55°C, and the time is 8.5h;

[0040] (2) Add carboxymethyl cellulose to deionized water, heat and stir until completel...

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Abstract

The invention relates to the technical field of lithium battery anode materials, and provides a coated nickel phosphate lithium anode material doped by copper and magnesium for a lithium battery, anda preparation method. The method comprises the following steps that: in the presence of surfactant, through a hydrothermal method, preparing nickel phosphate lithium material LiNi1-x-yMgxCuyPO4 dopedby copper and magnesium; then, spraying and depositing a coating liquid precursor which contains carboxymethylcellulose, lithium carbonate and vanadium pentoxide to the surfaces of LiNi1-x-yMgxCuyPO4particles; and carrying out pre-sintering at the temperature of 550-650DEG C and sintering at the temperature of 700-750DEG C to prepare the nickel phosphate lithium anode material mixed and coated with Li3VO4 / C. The nickel phosphate lithium anode material prepared by the preparation method has the advantages of good electrochemical performance, high ion electrical conductivity and good cycle performance and can keep a high specific capacity under high multiplying power.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium batteries, and provides a copper-magnesium-doped coated lithium nickel phosphate positive electrode material for lithium batteries and a preparation method thereof. Background technique [0002] As a new type of chemical power source developed in the 1990s, lithium batteries have outstanding advantages such as high working voltage, light weight, high specific capacity, small self-discharge, long cycle life, no memory effect, safety and reliability, and environmental protection. , has become an important field supporting the technology of the electronics industry, and has become an ideal energy source for small and lightweight electronic devices such as mobile phones, notebook computers, digital cameras, and digital cameras, and is also the preferred power source for light-duty high-power batteries such as future power vehicles and electric tools. [0003] Lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/366H01M4/5825H01M4/62H01M4/625H01M4/628H01M10/052Y02E60/10
Inventor 蔡杰
Owner 扬州虹途电子材料有限公司