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Application of fluoro-substituted phosphate in preparation of lithium ion battery electrode, lithium

A fluorophosphate, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle capacity attenuation, high industrialization cost, poor rate performance, etc., and achieve battery rate performance improvement and battery safety. The effect of improving performance and improving the condition of lithium precipitation

Inactive Publication Date: 2018-01-09
JIANGSU GUOTAI SUPER POWER NEW MATERIALS
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Problems solved by technology

However, the existing methods have the following defects: ① During the first cycle, the electrolyte and electrode materials in the lithium-ion battery system will react at the solid-liquid interphase level to form a layer of SEI film, which will consume the electrode materials Lithium in the active material leads to a low initial capacity of the lithium-ion battery; ②During the charge and discharge process, a certain thickness of the pole piece causes the battery to form a large concentration polarization, which in turn causes the battery capacity to fail to function normally and the rate performance to be poor , low temperature lithium precipitation, cycle capacity fading and a series of problems
This method can make up for the loss of lithium caused by the formation of the SEI film, but its actual industrialization cost is relatively high. At the same time, this method is also difficult to ensure that the lithium element can be completely coated and can exist stably in the high-temperature pole piece process. Not conducive to the application in lithium-ion batteries

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  • Application of fluoro-substituted phosphate in preparation of lithium ion battery electrode, lithium
  • Application of fluoro-substituted phosphate in preparation of lithium ion battery electrode, lithium
  • Application of fluoro-substituted phosphate in preparation of lithium ion battery electrode, lithium

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preparation example Construction

[0043] Correspondingly, the present invention provides a kind of preparation method of lithium ion battery electrode, comprises the following steps:

[0044] Coating the slurry including the additive on the current collector, drying and rolling to obtain a lithium-ion battery electrode; the additive is a fluorophosphate represented by formula I;

[0045] m a PO x f y Formula I;

[0046] Wherein, M is an alkali metal element, 0<a≤3, x and y are both integers, 1≤x, y≤4, x+y≤5.

[0047] The embodiment of the present invention firstly provides a slurry including an additive, the additive is a fluorophosphate represented by formula I, the content of which is as described above, and will not be repeated here. In an embodiment of the present invention, the slurry includes an active material, a conductive agent and a binder, and the contents of these components are also as described above. The slurry also includes a solvent, such as an organic solvent or water, for dispersing or...

Embodiment approach

[0055] In an embodiment of the present invention, the separator can be selected from various separator layers used in lithium-ion batteries known to those skilled in the art, such as polyolefin microporous membrane (PP microporous membrane), polyethylene felt (PE felt ), glass fiber mat, superfine glass fiber paper or PP / PE / PP composite film. As a preferred embodiment, the separator is a PP / PE / PP composite film.

[0056] In an embodiment of the present invention, the electrolyte is a non-aqueous electrolyte containing lithium salt and a non-aqueous solvent. Wherein, the lithium salt can be lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium perfluorobutylsulfonate, lithium aluminate, lithium chloroaluminate, lithium fluorosulfonimide One or more of lithium fluorophosphate, lithium chloride and lithium iodide, preferably LiPF 6 . The non-aqueous solvent can be gamma-but...

Embodiment 1

[0062] 1. Preparation of the positive electrode: Add sodium difluorophosphate with a total positive electrode solid mass fraction of 3% in N-methylpyrrolidone (NMP) solvent and stir to dissolve, and 88% lithium cobaltate (LiCoO 2 ), 4% acetylene black as a conductive material, 5% binder polyvinylidene fluoride (PVDF) are added in the solution, stirred to make a uniform slurry, the solid content of the slurry is 55%, and the obtained slurry is coated with Clothed on both sides of aluminum foil with a thickness of 12 μm, dried at 120° C., rolled and cut to obtain the positive electrode.

[0063] 2. Preparation of the negative electrode: Artificial graphite (Shanshan Technology, SS1-P10) with a total negative solid mass fraction of 95%, 2% binder styrene-butadiene rubber latex (SBR), 1% binder carboxymethyl Cellulose (CMC), 2% conductive material SP and water were added into a disperser for mixing to make a slurry with a solid content of 35%. The obtained slurry was coated on both...

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Abstract

The invention provides application of fluoro-substituted phosphate in preparation of a lithium ion battery electrode, the lithium ion battery electrode and a preparation method and application of thelithium ion battery electrode. The lithium ion battery electrode comprises a current collector and an electrode material, wherein the electrode material is loaded on the current collector and is prepared from paste comprising an additive, the additive is fluoro-substituted phosphate shown in a formula I, M is an alkali metal element, a is more than 0 but less than or equal to 3, x and y both are integers, x is more than or equal to 1, y is less than or equal to 4, and (x+y) is less than or equal to 5. The lithium ion battery electrode is prepared by employing the fluoro-substituted phosphate shown in the formula I, the polarization condition of a pole plate can be effectively improved, the stability of an SEI membrane is improved, and the lithium precipitation condition of a surface of thepole plate is improved. The lithium ion battery electrode provided by the invention is low in manufacturing cost, the rate performance of the battery is obviously improved after the battery is assembled, the lithium precipitation condition is obviously improved, the cycle stability is also obviously improved, and the safety of the battery is improved. The formula I is MaPOxFy.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, in particular to the application of fluorophosphate in preparing lithium ion battery electrodes, lithium ion battery electrodes, its preparation method and application. Background technique [0002] Due to the advantages of high working voltage, high energy density, low self-discharge rate, no memory effect, long cycle life and no pollution, lithium-ion batteries are widely used in various fields of daily life, including various portable electronic devices and electric vehicles, etc. . However, with the rapid development of science and technology, the development of miniaturization, long standby time, and long life of portable electronic equipment, and the use of high-power, high-energy equipment such as electric vehicles, all affect the energy of lithium-ion secondary batteries as energy storage power sources. Density, cycle life, environmental adaptability and other pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/136H01M4/1397H01M10/0525
CPCH01M4/136H01M4/1397H01M4/62H01M10/0525Y02E60/10
Inventor 朱幼仙
Owner JIANGSU GUOTAI SUPER POWER NEW MATERIALS
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