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Lithium ion battery and cathode thereof

A lithium-ion battery and negative electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cell deformation and cycle performance, achieve excellent cycle performance, high reversible capacity, and increase the weight of active materials.

Active Publication Date: 2012-10-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-capacity negative electrode for lithium-ion batteries, successfully introduce Si material into lithium-ion batteries, and overcome the existing cell deformation and cycle problems caused by the volume change of Si-based negative electrodes during charging and discharging. poor performance defect

Method used

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  • Lithium ion battery and cathode thereof
  • Lithium ion battery and cathode thereof
  • Lithium ion battery and cathode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using high-purity silicon as the silicon source, the amorphous silicon active layer is deposited on the Cu current collector by magnetron sputtering. The thickness of the deposited amorphous silicon active layer is 1 μm; the graphite active layer is coated on the above amorphous silicon active layer. Above, the graphite active layer is composed of graphite active material, conductive additive and binder. The graphite active material in the graphite active layer is a mixture of natural graphite and artificial graphite, and the proportion of natural graphite in the mixture of natural graphite and artificial graphite is 35%. The proportion of the amorphous silicon active layer in the entire negative electrode active material is 2%.

[0031] The initial reversible capacity of the above-mentioned negative electrode measured in the button battery is 391mAh / g, the initial efficiency is 86.8%, and the capacity retention rate after 30 cycles is 96%. The battery cycle curve is a...

Embodiment 2

[0033] Using high-purity silicon as the silicon source, the amorphous silicon active layer is deposited on the Cu current collector by magnetron sputtering. The thickness of the deposited amorphous silicon active layer is 0.2 μm; the graphite active layer is coated on the above amorphous silicon active layer. layer above. The graphite active layer is composed of graphite active material, conductive additive and binder. The graphite active material in the graphite active layer is natural graphite. The proportion of the amorphous silicon active layer in the entire negative electrode active material is 0.5%.

[0034] The initial reversible capacity of the above-mentioned negative electrode measured in the button battery is 354mAh / g, the initial efficiency is 89.2%, and the capacity retention rate after 30 cycles is 98.1%. The battery cycle curve is as figure 2 shown.

Embodiment 3

[0036]Using high-purity silicon as the silicon source, the amorphous silicon active layer is deposited on the Cu current collector by magnetron sputtering. The thickness of the deposited amorphous silicon active layer is 0.5 μm; the graphite active layer is coated on the above amorphous silicon active layer. layer above. The graphite active layer is composed of graphite active material, conductive additive and binder. The graphite active material in the graphite active layer is artificial graphite. The proportion of the amorphous silicon active layer in the entire negative electrode active material is 1%.

[0037] The initial reversible capacity of the above-mentioned negative electrode measured in the button battery is 365mAh / g, the initial efficiency is 88.3%, and the capacity retention rate after 30 cycles is 96.9%.

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Abstract

The invention belongs to technical field of lithium ion batteries, in particular relates to a cathode and a lithium ion battery using the cathode, and especially relates to a cathode capable of improving volume change of Si materials and a lithium ion battery with high energy density. The cathode comprises a current collector and active materials attached on the current collector, the active materials is composed of an A layer and a B layer, wherein the A layer is an amorphous silicon active layer, the B layer is a graphite active layer coated on the A layer which is contacted with the current collector directly, the thickness is limited in a range between 0.1mu m to 0.5mu m, the cathode has the advantages of the amorphous silicon active layer and the graphite active layer simultaneously, and the lithium ion battery manufactured through the cathode has the advantages of high capacity, low expansion, good cycle performance and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a negative electrode and a lithium ion battery using the material, in particular to a negative electrode capable of improving the volume change of Si material and a lithium ion battery with high energy density including the negative electrode. Background technique [0002] As we all know, lithium-ion batteries are called green batteries because of their high energy density, high specific power, high working voltage, good cycle performance, no memory effect, and no pollution. Since their birth, they have attracted widespread attention. With the development of high-performance consumer appliances and electric vehicles, people have put forward higher requirements on the performance of lithium-ion batteries, and the improvement of the energy density of lithium-ion batteries has become an urgent problem to be solved. Therefore, it is of great strategic significance to de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/133H01M4/134H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 华斌
Owner NINGDE AMPEREX TECH
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