Method for prolonging cycle life of lithium ion battery by piezoelectric ceramic

A technology of lithium ion batteries and piezoelectric ceramics, which is applied in the direction of repair/maintenance of secondary batteries, can solve the problems of easy change of the structure of lithium ion batteries, poor reversibility, etc., and achieves good industrial application prospects, improved reversibility, The effect of sufficient raw material resources

Inactive Publication Date: 2017-07-04
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of them can effectively overcome the defects of easy structure change and poor reversibility of lithium-ion batteries during cycle charge and discharge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for improving the cycle life of lithium-ion batteries by using piezoelectric ceramics, which specifically includes the following steps:

[0030] (1) Disperse the positive electrode material of lithium ion battery composed of lithium cobaltate, lithium manganate and lithium iron phosphate in ethylene glycol, and ultrasonically treat it at room temperature for 1 hour to obtain the precursor of the positive electrode material of lithium ion battery;

[0031] (2) The bismuth-layer structure titanate piezoelectric ceramic material is subjected to wet ball milling, drying, and sintering at 800° C. for 4 hours to obtain nanoscale piezoelectric ceramic solid-solution powder;

[0032] (3) Dispersing the piezoelectric ceramic solid-solution powder obtained in step (2) in ethylene glycol, stirring at a high speed and ultrasonicating for 4 hours to form a uniform suspension;

[0033] (4) under high-speed stirring, the lithium ion battery cathode material precursor obtained...

Embodiment 2

[0036] A method for improving the cycle life of lithium-ion batteries by using piezoelectric ceramics, which specifically includes the following steps:

[0037] (1) Disperse lithium-ion battery cathode materials composed of lithium cobaltate, lithium manganate, nickel-cobalt-manganese oxide, and lithium iron phosphate in absolute ethanol, and ultrasonically treat them for 4 hours at room temperature to obtain a lithium-ion battery cathode material precursor ;

[0038] (2) The perovskite structure titanate piezoelectric ceramic material is subjected to wet ball milling, drying, sintering at 1200° C. for 2 hours, and grinding to obtain nanoscale piezoelectric ceramic solid solution powder;

[0039] (3) Dispersing the piezoelectric ceramic solid-solution powder obtained in step (2) in absolute ethanol, stirring at a high speed, and ultrasonicating for 4 hours to form a uniform suspension;

[0040] (4) under high-speed stirring, the lithium ion battery cathode material precursor ...

Embodiment 3

[0043] A method for improving the cycle life of lithium-ion batteries by using piezoelectric ceramics, which specifically includes the following steps:

[0044] (1) Disperse lithium-ion battery cathode materials composed of lithium cobaltate, lithium manganese oxide, lithium nickelate and lithium iron phosphate in glycerin, and ultrasonically treat them at room temperature for 2 hours to obtain a lithium-ion battery cathode material precursor;

[0045] (2) The niobate piezoelectric ceramic material is subjected to wet ball milling, drying, sintering at 1000° C. for 3 hours, and grinding to obtain a nanoscale piezoelectric ceramic solid solution powder;

[0046] (3) Dispersing the piezoelectric ceramic solid-solution powder obtained in step (2) in glycerin, stirring at a high speed, and ultrasonicating for 3 hours to form a uniform suspension;

[0047] (4) under high-speed stirring, the lithium ion battery cathode material precursor obtained in step (1) is added to the suspensi...

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Abstract

The invention provides a method for prolonging cycle life of a lithium ion battery by piezoelectric ceramic. A small quantity of piezoelectric ceramic crystals are adopted in preparation of a precursor of a positive electrode material of a lithium battery; and when lithium ions are in mobility, the piezoelectric ceramic crystals, which suffer from an external electric field effect, generate mechanical deformation so as to suppress structural changes of lithium cobalt oxides, lithium manganate, lithium iron phosphate, lithium nickel cobalt phosphate and other lithium ion positive electrode materials in a cyclic charging-discharging process. Therefore, the problem of capacity fading of the electrode material in a cyclic process is solved fundamentally, the reversibility of the cyclic charging-discharging process is improved, and the cycle life is greatly prolonged; and in addition, lithium ions can pass freely and high electric conductivity is achieved, so that the initial efficiency and the rate capability of the lithium battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials, and in particular relates to a method for improving the cycle life of lithium-ion batteries by using piezoelectric ceramics. Background technique [0002] With the continuous progress of society and the rapid growth of the global economy, products brought about by the continuous development of science and technology play an indispensable role in people's lives. Electronic products, electric vehicles, medical equipment, etc. The requirements are getting higher and higher, people's demand for energy is increasing, and the understanding of the importance of sustainable social and economic development is deepening. Lithium-ion battery, as a new generation of green high-energy rechargeable battery, has achieved rapid development in the past 20 years due to its outstanding advantages such as high voltage, high energy density, good cycle performance, small self-discharge and environmental fr...

Claims

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Application Information

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IPC IPC(8): H01M10/42
CPCH01M10/42Y02E60/10
Inventor 陈庆王镭迪曾军堂
Owner CHENDU NEW KELI CHEM SCI CO LTD
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