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Composite lithium-rich manganese-based cathode material and preparation method thereof

A cathode material, lithium-rich manganese-based technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of unstable coating structure, poor conductivity, etc., to improve cycle stability, electrochemical performance improvement, The effect of high rate charge and discharge

Active Publication Date: 2017-05-24
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But amorphous LiNiPO 4 The structure of the cladding layer is not stable enough and the conductivity is poor

Method used

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  • Composite lithium-rich manganese-based cathode material and preparation method thereof
  • Composite lithium-rich manganese-based cathode material and preparation method thereof
  • Composite lithium-rich manganese-based cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Li 1.2 mn 0.6 Ni 0.2 o 2 The mass of NaZr 2 (PO 4 ) 3 When the mass ratio of the coating layer is 1:0.03, the preparation steps of the composite lithium-rich manganese-based positive electrode material are as follows:

[0049] Step 1. Dissolve 0.0053g of sodium nitrate in 2mL of deionized water, stir at 50°C and 500rpm for 0.5h to obtain a sodium salt solution; dissolve 0.0525g of zirconium nitrate pentahydrate in 3mL of deionized water, stir at 50°C and Stir at a stirring speed of 500rpm for 0.5h to obtain a zirconium salt solution; dissolve 0.0215g of ammonium dihydrogen phosphate in 5mL of deionized water, stir at 50°C and a stirring speed of 500rpm for 0.5h to obtain a phosphate solution; Dissolve 1,300,000 polyvinylpyrrolidone in 10 mL of deionized water, and stir for 6 hours at 30°C and a stirring speed of 500 rpm to obtain a complexing agent solution;

[0050] Step 2. Add the sodium salt solution, zirconium salt solution and phosphate solution prepared in ...

Embodiment 2

[0055] Li 1.2 mn 0.6 Ni 0.2 o 2 The mass of NaZr 2 (PO 4 ) 3 When the mass ratio of the coating layer is 1:0.05, the preparation steps of the composite lithium-rich manganese-based positive electrode material are as follows:

[0056] Step 1. Dissolve 0.0088g of sodium nitrate in 2mL of deionized water, stir at 50°C and 500rpm for 0.5h to obtain a sodium salt solution; dissolve 0.0876g of zirconium nitrate pentahydrate in 3mL of deionized water, stir at 50°C and Stir for 0.5 h at a stirring speed of 500 rpm to obtain a zirconium salt solution; dissolve 0.0357 g of ammonium dihydrogen phosphate in 5 mL of deionized water, and stir for 0.5 h at 50° C. and a stirring speed of 500 rpm to obtain a phosphate solution; Dissolve 1,300,000 g of polyvinylpyrrolidone in 10 mL of deionized water, and stir for 7 hours at 30°C and a stirring speed of 500 rpm to obtain a complexing agent solution;

[0057] Step 2. Add the sodium salt solution, zirconium salt solution and phosphate solu...

Embodiment 3

[0062] Li 1.2 mn 0.6 Ni 0.2 o 2 The mass of NaZr 2 (PO 4 ) 3 When the mass ratio of the coating layer is 1:0.07, the preparation steps of the composite lithium-rich manganese-based positive electrode material are as follows:

[0063] Step 1. Dissolve 0.0124g of sodium nitrate in 2mL of deionized water, stir at 50°C and 500rpm for 0.5h to obtain a sodium salt solution; dissolve 0.1225g of zirconium nitrate pentahydrate in 3mL of deionized water, stir at 50°C and Stir at a stirring speed of 500rpm for 0.5h to obtain a zirconium salt solution; dissolve 0.0501g of ammonium dihydrogen phosphate in 5mL of deionized water, and stir at 50°C for 1h at a stirring speed of 500rpm to obtain a phosphate solution; the average molecular mass of 1.4g is Dissolve 1,300,000 g of polyvinylpyrrolidone in 15 mL of deionized water, and stir for 7 hours at 30°C and a stirring speed of 500 rpm to obtain a complexing agent solution;

[0064] Step 2. Add the sodium salt solution, zirconium salt ...

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Abstract

The invention relates to a composite lithium-rich manganese-based cathode material and a preparation method thereof, belonging to the field of chemical energy storage batteries. The cathode material is a composite material with a core-shell structure; a NaZr2(PO4)3 coating layer with uniform deposition thickness is prepared on the surface of the lithium-rich manganese-based cathode material by a complexing method; and by changing the mass ratio of the NaZr2(PO4)3 to lithium-rich manganese-based cathode material, coating layers different in morphology, structure and arrangement can be obtained. With the NaZr2(PO4)3 coating layer, the relocation diffusion of Li<+> is improved in different degrees, which shows the improvement of electrochemical performance in varying degrees; and moreover, the composite lithium-rich manganese-based cathode material can realize high-rate charge / discharge of a battery so as to enhance the cycling stability of the battery.

Description

technical field [0001] The invention relates to a composite lithium-rich manganese-based positive electrode material and a preparation method thereof, belonging to the field of chemical energy storage batteries. Background technique [0002] The fundamental issues facing the world today are energy and the environment. These two issues are related to the survival of our human beings, and at the same time, they restrict our development everywhere. As one of the biggest contributions of traditional fossil energy, automobiles not only bring people convenient travel, but also cause a series of problems such as air pollution, noise pollution, and traffic congestion. In order to solve these problems, in recent years, more and more new energy electric vehicles have entered our lives. With the popularization of electric vehicles, the performance of lithium-ion batteries as the power source of electric vehicles is urgently needed to be improved. The state proposes that by 2020, the ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 苏岳锋李翌通包丽颖吴锋卢赟王敬陈实陈来
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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