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Lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, applied in the field of electrochemistry, can solve the problems of low capacity of positive electrode materials and slow lithium insertion speed, and achieve the effects of easy large-scale production, improving the ability to store electric charges, and increasing capacity.

Inactive Publication Date: 2013-12-25
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercial lithium-ion batteries mainly use metal oxides (lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, etc.) , In addition, the negative electrode of the lithium-ion battery that uses graphite as the positive electrode also uses graphite as the negative electrode, but the lithium-intercalation capacity of the graphite negative electrode is the highest at 372mAh / g. Therefore, a new system is urgently needed to improve the lithium-ion battery.

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  • Lithium ion battery and preparation method thereof

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preparation example Construction

[0050] In addition, the present invention also provides a kind of preparation method of lithium ion battery, comprises the following steps:

[0051] Step (1) Preparation of positive and negative electrodes:

[0052] Mix the positive electrode active material, binder and conductive agent uniformly in a mass ratio of 85-90:5-10:5-10 to obtain a mixed slurry, coat the mixed slurry on an aluminum foil, and dry , film rolling, and edge trimming to obtain the positive electrode sheet of lithium-ion battery; wherein, the positive electrode active material has a specific surface area of ​​1~20m 2 / g of graphite;

[0053] Mix the negative electrode active material, binder and conductive agent uniformly in a mass ratio of 85-90:5-10:5-10 to obtain a mixed slurry, coat the mixed slurry on an aluminum foil, and dry , film rolling, and edge trimming to obtain lithium-ion battery anode sheets; wherein, the anode active material has a specific surface area of ​​200~3000m 2 / g carbon mater...

Embodiment 1

[0071] A preparation method for a lithium ion battery, comprising the following steps:

[0072] (1) The specific surface area of ​​25.5g is 1m 2 / g of graphite, 1.5g of polyvinylidene fluoride binder and 3g of acetylene black conductive agent are mixed evenly to obtain a mixed slurry, which is coated on an aluminum foil, dried, rolled, and trimmed to obtain a Lithium-ion battery positive plate;

[0073] (2) The specific surface area of ​​8.5g is 1500m 2 Graphene / g, 0.5g polyvinylidene fluoride binder, and 1g acetylene black conductive agent were mixed evenly to obtain a mixed slurry, which was coated on an aluminum foil, dried, rolled, and edge-trimmed. Obtain lithium-ion battery negative plate;

[0074] In this embodiment, the mass ratio of the negative electrode active material to the positive electrode active material is 1:3;

[0075] (3) Take the polypropylene diaphragm, assemble it with the positive electrode sheet and the negative electrode sheet stack to form a batt...

Embodiment 2

[0079] A preparation method for a lithium ion battery, comprising the following steps:

[0080] (1) The specific surface area of ​​127.5g is 20m 2 Graphite / g, 15g polytetrafluoroethylene binder and 7.5g Ketjen black conductive agent are mixed evenly to obtain mixed slurry, which is coated on aluminum foil, and processed by drying, film rolling and trimming. Obtain lithium-ion battery positive plate;

[0081] (2) The specific surface area of ​​8.5g is 1500m 2Nitrogen-doped graphene / g, 1g polytetrafluoroethylene binder and 0.5g Ketjen black conductive agent are mixed evenly to obtain a mixed slurry, which is coated on an aluminum foil, dried, rolled, cut Side processing, made lithium-ion battery negative plate;

[0082] In this embodiment, the mass ratio of the negative electrode active material to the positive electrode active material is 1:15;

[0083] (3) Take the polyethylene diaphragm, assemble it with the positive electrode sheet and the negative electrode sheet stack ...

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Abstract

The invention provides a lithium ion battery which comprises a cathode, an anode, a separator between the cathode and the anode, and a electrolyte; the cathode active material is graphite with a specific surface area of 1-20 m<2> / g, the anode active material is graphene or a graphene derivative with a specific surface area of 200-1500 m<2> / g, and the mass ratio of the anode active material to the cathode active material is 1:3-15. Additionally, the invention provided a preparation method of the lithium ion battery. The energy storage mechanism of the cathode active material and the anode active material of the lithium ion battery is an ion intercalation-deintercalation mechanism, so that charge storage capability of the electrode is improved and the capacity of the whole system is improved. The preparation method of the lithium ion battery is simple in operation.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a lithium ion battery and a preparation method thereof. Background technique [0002] In today's society, information, energy and new materials have become important development directions and pillar industries on a global scale. With the continuous progress of society, energy and environmental issues have become the key to sustainable development. With the gradual reduction of non-renewable energy and increasingly severe environmental problems in the world, the development and application of new energy is urgent. Chemical power sources have the characteristics of high energy conversion efficiency, high energy density, no noise pollution, and can be combined and moved at will. Lithium-ion battery is a kind of portable chemical power source with the highest specific energy at present. It has the advantages of high voltage, large specific energy, stable discharge voltage, good low...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/583H01M10/058
CPCY02E60/10Y02P70/50
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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