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A kind of composite negative pole piece of lithium ion battery and preparation method thereof, lithium ion battery

A technology of lithium ion battery and negative pole piece, which is applied to battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of reducing the rate performance, low conductivity and poor conductivity of lithium ion batteries, and improve cycle performance and energy. Density, high rate performance, and the effect of reducing internal resistance

Active Publication Date: 2019-10-25
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low conductivity of the silicon material itself makes the conductivity between the first active layer and the second active layer of the composite negative electrode sheet poor, reducing the rate performance of the lithium-ion battery.

Method used

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  • A kind of composite negative pole piece of lithium ion battery and preparation method thereof, lithium ion battery
  • A kind of composite negative pole piece of lithium ion battery and preparation method thereof, lithium ion battery
  • A kind of composite negative pole piece of lithium ion battery and preparation method thereof, lithium ion battery

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Effect test

Embodiment 1

[0033] The composite negative pole piece of the lithium ion battery of this embodiment, such as figure 1 As shown, it includes a current collector 1 and a silicon material layer 2, a graphene layer 3, an active material layer 4, and an aluminum oxide material layer 5 arranged in a direction away from the current collector, that is, a silicon material layer 2 is provided on the surface of the current collector 1, A graphene layer 3 is provided on the surface of the silicon material layer 2, an active material layer 4 is provided on the surface of the graphene layer 3, and an alumina material layer 5 is provided on the surface of the active material layer 4. The current collector is a copper mesh with a thickness of 10 μm and a porosity of 50%; the thickness ratio of the current collector, silicon material layer, graphene layer, active material layer and alumina material layer is 10:1:1:120:3; The silicon material is SiB 4 The active material layer is composed of artificial graphi...

Embodiment 2

[0043] The lithium ion battery composite negative pole piece of this embodiment includes a current collector and a silicon material layer, a graphene layer, an active material layer, and an alumina material layer arranged in a direction away from the current collector, that is, a silicon material is arranged on the surface of the current collector Layer, a graphene layer is arranged on the surface of the silicon material layer, an active material layer is arranged on the surface of the graphene layer, and an alumina material layer is arranged on the surface of the active material layer. The current collector is a copper mesh with a thickness of 10 μm and a porosity of 30%; the thickness ratio of the current collector, silicon material layer, graphene layer, active material layer and alumina material layer is 8:0.5:0.5:80:1. The silicon material is Mg 2 Si; the active material layer is composed of artificial graphite, conductive agent SP, LA132 binder, the mass ratio of artificia...

Embodiment 3

[0053] The lithium ion battery composite negative pole piece of this embodiment includes a current collector and a silicon material layer, a graphene layer, an active material layer, and an alumina material layer arranged in a direction away from the current collector, that is, a silicon material is arranged on the surface of the current collector Layer, a graphene layer is arranged on the surface of the silicon material layer, an active material layer is arranged on the surface of the graphene layer, and an alumina material layer is arranged on the surface of the active material layer. The current collector is a copper mesh with a thickness of 10 μm and a porosity of 60%; the thickness ratio of the current collector, silicon material layer, graphene layer, active material layer and alumina material layer is 15:2:2:150:5. The silicon material is TiSi 2 The active material layer is composed of artificial graphite, conductive agent SP, LA132 binder, the mass ratio of artificial gr...

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Abstract

The invention relates to a composite negative pole piece of a lithium ion battery and a preparation method of the composite negative pole piece as well as the lithium ion battery and belongs to the technical field of lithium ion batteries. The composite negative pole piece of the lithium ion battery, provided by the invention, comprises a current collector, a silicon material layer arranged on the surface of the current collector, a graphene layer arranged on the surface of the silicon material layer and an active substance layer arranged on the surface of the graphene layer, wherein a silicon material in the silicon material layer is one of SiB4, SiB6, Mg2Si, Ni2Si, TiSi2, CoSi2, CaSi2, MnSi2 and SiC. According to the composite negative pole piece of the lithium ion battery, the silicon material layer is arranged on the surface of the current collector so that a contact area between the silicon material and the current collection can be improved, and the inner resistance is reduced and the circulating performance and energy density are improved; the graphene layer is arranged on the surface of the silicon material layer so that the expansion ratio of the silicon material layer in a utilization process can be reduced; and meanwhile, the rate performance of the pole piece can also be improved by the high conductivity of graphene.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery composite negative pole piece and a preparation method thereof, and a lithium ion battery. Background technique [0002] Commercial lithium-ion batteries are widely used in electric vehicles, digital electronics, energy storage and other fields due to their high energy density, long cycle life, and environmental friendliness. As the market has higher and higher requirements for the performance of lithium-ion batteries, the improvement of the energy density and safety performance of lithium-ion batteries has become a hot spot for research and development. [0003] At present, the main measures to improve the safety of lithium-ion batteries include the use of ceramic separators, the use of safe electrolytes and the use of high-safety positive and negative materials, and the surface modification of the negative pole pieces rarely improves the safety of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/04
CPCH01M4/0426H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/366H01M4/386H01M4/587H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 何伟周骥彭林
Owner CALB CO LTD