Lithium-ion battery negative electrode pole piece, preparation method thereof and lithium-ion secondary battery

A technology of lithium ion battery and negative pole piece, applied in the field of lithium ion battery negative pole piece and lithium ion secondary battery, can solve the problems of inability to meet industrial demands, low theoretical specific capacity, etc. High capacity and good ductility

Inactive Publication Date: 2019-10-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although graphite has the advantages of high initial Coulombic efficiency (greater than 90%), low cost, and stable cycle performance, its theoretical specific capacity (372mAh / g) is relatively low, and the actual specific capacity is already close to the theoretical value, so it is difficult to improve it. , has been increasingly unable to meet industrial needs

Method used

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  • Lithium-ion battery negative electrode pole piece, preparation method thereof and lithium-ion secondary battery
  • Lithium-ion battery negative electrode pole piece, preparation method thereof and lithium-ion secondary battery
  • Lithium-ion battery negative electrode pole piece, preparation method thereof and lithium-ion secondary battery

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Effect test

Embodiment 1

[0028] The preparation method of a kind of lithium-ion battery negative pole sheet of the present embodiment comprises the following steps:

[0029] Step 1, select a 100 μm pure tin metal foil as a self-supporting negative electrode;

[0030] Step 2, wipe the surface of the self-supporting negative electrode with alcohol, remove the stains on the surface, and dry it. Cut the dried self-supporting negative electrode into discs with a diameter of 12 mm to obtain battery pole pieces;

[0031] In step 3, the battery pole piece is placed in a vacuum oven at 80° C. for 6 hours to 12 hours to obtain a lithium ion battery negative pole piece.

[0032] In this example, CR2025 button-type lithium iron phosphate / / tin full battery and tin / / lithium half-cell were assembled in a glove box with both water and oxygen content 6 ) were dissolved in DEC and EC solvents with a volume ratio of 1:1 and a ceramic separator was assembled into a secondary battery.

[0033] figure 1 It is the physic...

Embodiment 2

[0038] The preparation method of a kind of lithium-ion battery negative pole sheet of the present embodiment comprises the following steps:

[0039] Step 1, selecting 15 μm-100 μm tin-copper alloy containing 0.7wt% copper as the metal foil for the negative electrode;

[0040] Step 2, wipe the surface of the negative electrode with metal foil with alcohol, after drying, cut it into discs with a diameter of 12mm to obtain battery pole pieces;

[0041] In step 3, the battery pole piece is placed in a vacuum oven at 80° C. for 6 hours to 12 hours to obtain a lithium ion battery negative pole piece.

[0042] In this embodiment, a button-type full battery is assembled by using the lithium-ion battery negative pole piece and the lithium iron phosphate positive pole in a glove box where the water oxygen content is <0.1 ppm.

Embodiment 3

[0044] The preparation method of a kind of lithium-ion battery negative pole sheet of the present embodiment comprises the following steps:

[0045] Step 1, selecting 15 μm-100 μm tin-silver alloy foil material containing 3.5wt% silver as the metal foil for the negative electrode;

[0046] Step 2, wipe off the stains with alcohol on the surface of the metal foil for the negative electrode, dry it, and cut it into discs with a diameter of 12mm to obtain battery pole pieces;

[0047] In step 3, the battery pole piece is placed in a vacuum oven at 80° C. for 6 hours to 12 hours to obtain a lithium ion battery negative pole piece.

[0048]In this embodiment, a button-type full battery is assembled by using the lithium-ion battery negative pole piece and the lithium iron phosphate positive pole in a glove box where the water and oxygen content must meet <0.1ppm.

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Abstract

The invention provides a lithium-ion battery negative electrode pole piece, a preparation method thereof and a lithium-ion secondary battery. The lithium-ion battery negative electrode pole piece is made of pure tin metal foil and tin-based alloy foil. The method includes the following steps of (1) selecting the pure tin metal foil or the tin-based alloy foil of a predetermined thickness as a metal foil for a negative electrode, (2) wiping the surface of the metal foil for the negative electrode with ethyl alcohol and drying and cutting the dried metal foil according to the size of a pole piece of the lithium-ion secondary battery to obtain a battery pole piece, and (3) placing the battery pole piece into a vacuum oven at 80 DEG C for 6 to 12 hours to obtain the lithium-ion battery negative electrode pole piece.

Description

technical field [0001] The invention belongs to the field of battery negative electrode material preparation, and in particular relates to a negative electrode sheet of a lithium ion battery, a preparation method thereof and a lithium ion secondary battery. Background technique [0002] With the development of society and the continuous growth of the world's population, human beings' demand for energy is increasing. The energy used in the past is mainly oil, coal and natural gas, and these mineral energy sources are rapidly depleting. In addition, the emission of pollutants such as carbon dioxide and other gas products from the combustion of fossil fuels has caused serious environmental problems. In order to alleviate the problems caused by traditional energy, the efficient use of renewable energy has become the focus of research by researchers all over the world. The battery stores electrical energy in the form of chemical energy. When charging, the electrical energy provi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/36H01M4/38H01M4/66H01M10/0525H01M4/1395
CPCH01M4/134H01M4/1395H01M4/364H01M4/387H01M4/662H01M4/661H01M4/666H01M10/0525H01M2004/027Y02E60/10
Inventor 胥会李洒黄云辉张灿陈鑫龙刘文健
Owner TONGJI UNIV
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