Lithium ion battery anode material coated with piezoelectric material on surface and preparation method thereof

A technology for lithium-ion batteries and piezoelectric materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of destroying the bulk phase structure of positive active materials, thermal safety of materials with slow ion diffusion, and declining material structure stability. , to achieve the effect of improving the diffusion rate, improving the structural stability and electrochemical cycle performance, and being easy to operate.

Pending Publication Date: 2019-06-21
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a continuous bulk structure phase transition in the positive electrode active material during the electrochemical cycle, resulting in a decrease in the structural stability of the material, as well as slow ion diffusion at the interface between the positive electrode active material and the cladding layer, and the thermal safety of the material is still an urgent issue. Addressing constraints
[0006] In the prior art, there is a piezoelectric ceramic material added to the precursor of the positive electrode active material, that is, the positive electrode active material is mixed with the piezoelectric ceramic material, so that the piezoelectric ceramic material can enhance ion diffusion in the positive electrode material, but no coating layer is formed. The material has poor stability due to the destruction of the bulk phase structure of the positive electrode active material

Method used

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  • Lithium ion battery anode material coated with piezoelectric material on surface and preparation method thereof
  • Lithium ion battery anode material coated with piezoelectric material on surface and preparation method thereof
  • Lithium ion battery anode material coated with piezoelectric material on surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Piezoelectric material LiTaO 3 Coated lithium-ion battery lithium-rich cathode material Li 1.2 mn 0.56 Ni 0.17 co 0.07 o 2 .

[0042] (1) Configure 0.1 M Ta 2 o 5 、C 4 h 6 o 6 and CH 3 COOLi was dissolved in ethanol solution, selected according to the proportion, dropped into the positive electrode material solution dissolved in ethanol, and then mixed and stirred for 8 h;

[0043] (2) The above mixed solution was heated to 100 °C, stirred and evaporated, and then dried in a drying oven at 120 °C for 12 h to obtain a xerogel;

[0044] (3) Put the above dry gel into a crucible after being ground, calcined at 500 °C for 48 h, and naturally cooled to room temperature to obtain the piezoelectric material LiTaO 3 coated lithium-rich cathode material.

Embodiment 2

[0046] Piezoelectric material BaTiO 3 Coated lithium-ion battery lithium-rich cathode material Li 1.2 mn 0.56 Ni 0.17 co 0.07 o 2 .

[0047] (1) Configure 0.1 M of Ba 2 CO 3 、C 6 h 8 o 7 and C 16 h 36 CO 4 Ti is dissolved in the ethanol solution, selected according to the ratio, dropped into the positive electrode material solution dissolved in ethanol, and then mixed and stirred for 10 h;

[0048] (2) The above mixed solution was heated to 80 °C, stirred and evaporated, and then dried in an oven at 80 °C for 12 h to obtain a xerogel;

[0049] (3) The above dry gel was ground and put into a crucible, calcined at 900 °C for 12 h, and then naturally cooled to room temperature to obtain the piezoelectric material BaTiO 3 coated lithium-rich cathode material.

Embodiment 3

[0051] Piezoelectric material LiNbO 3 Coated Lithium Iron Phosphate Cathode Material LiFePO for Lithium-ion Batteries 4 .

[0052] (1) Configure Nb of 0.1 M 2 o 5 、C 4 h 6 o 6 and CH 3 COOLi was dissolved in ethanol solution, selected according to the proportion, dropped into the positive electrode material solution dissolved in ethanol, and then mixed and stirred for 8 h;

[0053] (2) The above mixed solution was heated to 120 °C, stirred and evaporated, and then dried in a drying oven at 120 °C for 12 h to obtain a xerogel;

[0054] (3) Put the above dry gel into a crucible after being ground, calcined at 550 °C for 24 h, and naturally cooled to room temperature to obtain the piezoelectric material LiNbO 3 Coated lithium iron phosphate cathode material.

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Abstract

The invention provides a lithium ion battery anode material coated with piezoelectric material on the surface and a preparation method thereof. The surface of the battery anode material is coated witha layer of piezoelectric material with piezoelectric effect; the piezoelectric material comprises any one or more of barium titanate, lithium niobate, sodium niobate, lithium tantalite, sodium-potassium metaniobate and barium-strontium metaniobate with piezoelectric effect. The piezoelectric characteristic of the piezoelectric material is utilized to realize a coating modification function for the anode active materials so as to ensure that the volume phase structures of the anode active materials are not influenced and damaged, the growth of solid-electrolyte interface membranes is suppressed, and the diffusion speeds of active material-coating layer interface lithium ions are improved, thereby effectively improving the structure stability and electrochemical cycle performance of the lithium ion battery anode material, improving the pyrolysis temperature of the anode material and then enhancing the safety performance of the lithium ion batteries in the using process.

Description

technical field [0001] The invention relates to the field of surface modification of positive electrode active materials of new energy lithium ion batteries, in particular to a lithium ion battery positive electrode material with a surface coated piezoelectric material and a preparation method thereof. Background technique [0002] Lithium-ion batteries were first commercialized by Sony Corporation of Japan in 1990. Because of their advantages of high specific energy and high energy storage efficiency, they have been gradually used in energy storage systems, mobile electronic devices, electric vehicles and other energy fields in recent years. The main constituent materials of lithium-ion batteries include electrolyte, separator, positive electrode material and negative electrode material. Among them, the positive electrode material occupies a large proportion and is the key material to promote the performance of lithium-ion batteries. Therefore, the preparation of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/485H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 郁彩艳司梦婷赵慧玲白莹
Owner HENAN UNIVERSITY
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