Pole piece of negative electrode and preparation method of pole piece as well as lithium-ion battery using negative electrode

A negative electrode sheet and negative electrode technology, which is applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of increased cost and complicated process, and achieve the effects of improving compaction density, simple and easy preparation method, and saving manufacturing cost

Inactive Publication Date: 2016-10-26
DONGGUAN AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The prior art discloses a hard carbon negative electrode material composed of pitch-based hard carbon and natural graphite, which improves the first-time efficiency of lithium-ion batteries to a certain extent and improves its rate performance, but increases the cost of material preparation, and the process is complicated

Method used

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  • Pole piece of negative electrode and preparation method of pole piece as well as lithium-ion battery using negative electrode
  • Pole piece of negative electrode and preparation method of pole piece as well as lithium-ion battery using negative electrode
  • Pole piece of negative electrode and preparation method of pole piece as well as lithium-ion battery using negative electrode

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preparation example Construction

[0047] The present application also relates to the preparation method of the negative electrode sheet, which method selects any one of the following methods:

[0048] 1) One layer of graphite coating slurry is coated on one side of the negative electrode current collector, and dried to obtain a graphite coating; a layer of hard carbon coating slurry is coated on the graphite coating, and dried to obtain a hard carbon coating; Prepare graphite coating and hard carbon coating successively in the same manner and order on the other side of the negative electrode current collector;

[0049] 2) One layer of hard carbon coating slurry is coated on one side of the negative electrode current collector, and dried to obtain a hard carbon coating; a layer of graphite coating slurry is coated on the hard carbon coating, and dried to obtain a graphite coating; On the other side of the negative electrode collector, prepare a hard carbon coating and a graphite coating in the same manner and i...

Embodiment 1～5

[0056] LiCoO 2 As the positive electrode material, it is mixed with the conductive agent Super P and the binder polyvinylidene fluoride (PVDF) at a mass ratio of 90:5:5, and the solvent N-methylpyrrolidone is added, and the positive electrode slurry is obtained after mixing and stirring. Coating, cold pressing, slitting, and cutting into pieces to obtain positive pole pieces.

[0057] Mix and stir graphite, conductive agent (mixture of Super P and graphene), binder PVDF and solvent N-methylpyrrolidone to obtain graphite negative electrode slurry. The hard carbon negative electrode slurry is obtained after mixing and stirring polyacrylonitrile-based hard carbon powder, conductive agent Super P, binder PVDF and solvent N-methylpyrrolidone. Wherein in the graphite negative electrode slurry, the mass ratio of graphite, conductive agent and binder is 97:1.5:1.5, and the weight content of graphene in the graphite negative electrode slurry is 0.3-1.0%. In the hard carbon negative e...

Embodiment 6～10

[0067] The preparation methods of the positive electrode sheet, the graphite negative electrode slurry, and the hard carbon negative electrode slurry are the same as in Example 1. First coat the above-mentioned graphite negative electrode slurry on the copper foil of the negative electrode current collector, and the thickness of the coating film is 10-100 μm to obtain a graphite coating; after drying at 110°C for 2-3 hours, then coat the hard carbon negative electrode slurry, and the thickness of the coating film is 10-100 μm to obtain a hard carbon coating, and dry at 110°C for 2-3 hours. On the other side of the copper foil, apply the graphite negative electrode slurry and the hard carbon negative electrode slurry respectively in the same method and order as above. The above pole pieces were cold-pressed, stripped, and cut into pieces to obtain the negative pole pieces of Examples 6-10, the structure of which was graphite / hard carbon. The coating thicknesses of the negative...

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Abstract

The invention relates to the field of lithium-ion battery materials and in particular relates to a pole piece of a negative electrode and a lithium-ion battery using the negative electrode. The pole piece of the negative electrode, provided by the invention, comprises a negative electrode current collector, a graphite coating and a hard carbon coating; graphene is used as a conductive agent and is added into the graphite coating, so that on one hand, dynamics properties of the graphite coating can be improved; on the other hand, the lubrication effect of the graphene conductive agent is utilized, so that damage to materials by residual stress caused by cold pressing can be reduced, and the compaction density of the negative electrode is improved. A corresponding negative electrode preparation method is simple and feasible, and the materials do not need to be modified, so that the manufacturing cost of battery cells is reduced.

Description

technical field [0001] The present application relates to the field of lithium-ion battery materials, in particular, to a negative pole piece, a preparation method thereof and a lithium-ion battery using the negative pole. Background technique [0002] Graphite is the most widely commercialized lithium-ion battery anode material. With the development of social economy and the advancement of information technology, people have higher and higher requirements for the energy density and performance of lithium-ion batteries. Conventional lithium-ion secondary batteries use lithium cobalt oxide as the positive electrode and graphite as the negative electrode. Lithium ions in the positive electrode enter the interlayer of the negative electrode graphite during charging. During the discharge process, lithium ions are released from the graphite layer and returned to the positive electrode. However, the theoretical gram capacity of graphite is only 372mAh / g, which cannot meet the ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/366H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 金娟
Owner DONGGUAN AMPEREX TECH
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