Negative pole piece for lithium battery, preparation method of negative pole piece and lithium battery with negative pole piece

A negative electrode sheet and lithium battery technology, which is applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of graphite peeling off and large amount of addition, so as to improve the first-time efficiency, stability, and improvement The effect of cycle performance

Inactive Publication Date: 2013-04-03
DONGGUAN AMPEREX TECH
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Problems solved by technology

[0009] It should be noted that the patent application whose publication number is CN102201565 A discloses a high-capacity metal lithium powder composite negative electrode and its preparation method and multilayer composite electrode, but in this patent, metal lithium powder is used as the negative electrode active material, and the amount of addition Large and placed inside the pole piece, it does not improve the graphite peeling problem

Method used

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  • Negative pole piece for lithium battery, preparation method of negative pole piece and lithium battery with negative pole piece

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Embodiment 1

[0030] The invention provides a lithium battery negative electrode sheet, such as figure 1 As shown, it includes a current collector 1 and a graphite layer 2 disposed on the current collector 1, and also includes a protective layer 3 and a lithium metal layer 4, the protective layer 3 is disposed on the graphite layer 2, and the lithium metal layer 4 is disposed on the protective layer 3 superior.

[0031] In this embodiment, the thickness of the graphite layer 2 is 50 μm, the thickness of the protective layer 3 is 40 μm, and the thickness of the metal lithium layer 4 is 500 nm. Wherein, the protective layer 3 includes an adhesive, a conductive agent and an active material. The adhesive is sodium carboxymethyl cellulose-styrene butadiene rubber, the active material is hard carbon, and the conductive agent is superconducting carbon.

Embodiment 2

[0033] In this embodiment, the thickness of the graphite layer 2 is 10 μm, the thickness of the protective layer 3 is 1 μm, and the thickness of the metal lithium layer 4 is 100 nm. Wherein, the protective layer 3 includes an adhesive, a conductive agent and an active material, wherein the adhesive is polyacrylonitrile, the active material is silicon-aluminum alloy, and the conductive agent is carbon fiber. Other structures are the same as in Embodiment 1.

Embodiment 3

[0035] In this embodiment, the thickness of the graphite layer 2 is 200 μm, the thickness of the protective layer 3 is 100 μm, and the thickness of the metal lithium layer 4 is 2 μm. Wherein, the protective layer 3 includes an adhesive, a conductive agent and an active material, wherein the adhesive is polyimide, the active material is a tin-copper alloy, and the conductive agent is superconducting carbon. Other structures are the same as in Embodiment 1.

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Abstract

The invention belongs to the technical field of lithium batteries, and in particular relates to a negative pole piece for a lithium battery. The negative pole piece comprises a current collector and a graphitic layer arranged on the current collector, and further comprises a protecting layer and a metal lithium layer, wherein the protecting layer is arranged on the graphitic layer; and the metal lithium layer is arranged on the protecting layer. Compared with the prior art, the negative pole piece is provided with the protecting layer on the surface of the graphitic layer, and the metal lithium layer on the surface of the protecting layer, when the negative pole piece is assembled into the lithium battery, metal lithium powder diffuses in the negative pole piece in an electrochemical manner, so that the first time efficiency of a negative pole is improved, and moreover, the energy density of the lithium battery is increased, and the capacity of the lithium battery is enhanced; and at the same time, the protecting layer is equivalent to a buffer layer which can effectively prevent the graphitic layer from internally peeling off, so that the stability of an SEI (Solid Electrolyte Interphase) membrane on the surface of the negative pole piece is improved, and the circulation performance of the battery is improved. In addition, the invention also discloses a preparation method of the negative pole piece and a lithium battery with the negative pole piece.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a lithium battery negative electrode sheet, a preparation method thereof and a lithium battery containing the negative electrode sheet. Background technique [0002] With the widespread application of lithium batteries, people put forward higher requirements for the energy density of lithium batteries. In the lithium battery system, the initial charge and discharge efficiency of the battery is mainly determined by the initial efficiency of the negative electrode. Therefore, improving the initial efficiency of the negative electrode can effectively improve the initial efficiency and discharge capacity of the battery, thereby improving the energy density of the battery. [0003] In order to improve the primary efficiency of the negative electrode, many researchers have conducted research and achieved some results. For example, the Chinese patent application w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/052
CPCY02E60/10
Inventor 陈振钟开富赵丰刚
Owner DONGGUAN AMPEREX TECH
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