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Lithium battery with high specific energy and preparation method for current collector of lithium battery

A lithium battery and current collector technology, which is applied in the direction of battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of affecting the use of lithium-ion batteries, insufficient binding force, and low specific surface area, and achieve large binding force and improved The effect of binding force and large specific surface area

Active Publication Date: 2014-01-29
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the aluminum mesh and copper mesh used as battery current collectors have affected their use in lithium-ion batteries due to their low specific surface area and insufficient binding force with positive and negative electrode pastes.

Method used

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  • Lithium battery with high specific energy and preparation method for current collector of lithium battery
  • Lithium battery with high specific energy and preparation method for current collector of lithium battery
  • Lithium battery with high specific energy and preparation method for current collector of lithium battery

Examples

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Effect test

Embodiment 1

[0028] will contain 90 wt .% lithium manganate, 6 wt .% PVDF and 4 wt The mixture of .% acetylene black is coated on the 20μm carbon-coated aluminum mesh prepared by the magnetron sputtering method as the positive pole piece; will contain 90 wt .% Artificial graphite, 5 wt .% PVDF and 5 wt The mixture of .% acetylene black was coated on the 25 μm carbon-coated copper grid prepared by magnetron sputtering method as the negative pole piece; the PP single-layer separator, the positive pole piece and the negative pole piece were as figure 1 , 2 Laminate in the manner shown, pack with aluminum-plastic film, and inject electrolyte to obtain a high-specific-energy lithium battery.

Embodiment 2

[0030] will contain 85 wt .% nickel cobalt manganese ternary material, 7 wt .% Hydroxypropyl Methyl Cellulose and 8 wt .% The mixture of nano-carbon fibers is coated on a 50 μm carbon-coated aluminum mesh prepared by magnetron sputtering as a positive pole piece; will contain 93 wt .% lithium titanate, 5 wt .% hydroxypropyl methylcellulose and 2 wt .% The mixture of nano-carbon fibers is coated on a 10 μm carbon-coated copper grid prepared by magnetron sputtering as a negative pole piece; a PE single-layer separator, a positive pole piece and a negative pole piece such as figure 2 Laminate in the manner shown, pack with aluminum-plastic film, and inject electrolyte to obtain a high-specific-energy lithium battery.

Embodiment 3

[0032] will contain 95 wt .% layered lithium-rich material, 3 wt .% polyvinylidene fluoride and 2 wt .% The mixture of carbon nanotubes is coated on a 15 μm carbon-coated aluminum mesh prepared by magnetron sputtering as a positive pole piece; will contain 87 wt .% Silicon carbon composite material, 8 wt .% PVDF and 5 wt.% The mixture of carbon nanotubes is coated on a 35 μm carbon-coated copper grid prepared by magnetron sputtering as the negative pole piece; the PP / PE / PP three-layer composite diaphragm, the positive pole piece and the negative pole piece are as figure 2 Laminate in the manner shown, pack with aluminum-plastic film, and inject electrolyte to obtain a high-specific-energy lithium battery.

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Abstract

The invention relates to a lithium battery with high specific energy and a preparation method for a current collector of the lithium battery. The lithium battery with the high specific energy is characterized by comprising a positive pole piece, a negative pole piece, a diaphragm and a current collector. The current collector is a carbon-coated aluminum net or a carbon-coated copper net which is prepared by adopting a magnetron sputtering method. The preparation method is simple, the specific surface area of the aluminum net or the copper net after being coated with carbon is high, the mechanical strength is high, the adhesiveness between the electrode sizing agents is strong, and power dropping phenomenon of the pole piece in the charging-discharging process of the battery is obviously reduced. In addition, a transitional layer is also arranged between a carbon layer and the metal net in the current collector in a coating manner, so that the bonding force between the carbon layer and the metal net can be greatly increased, and the safety of a single battery can be improved.

Description

technical field [0001] The invention relates to a lithium battery with high specific energy and a method for preparing a current collector of the lithium battery. The surface of the current collector is coated with a thin carbon layer, and belongs to the technical field of lithium ion batteries. Background technique [0002] In recent years, with the continuous improvement of calls for energy conservation and emission reduction, the development of new energy vehicles has become more and more vigorous. New energy vehicles are different from traditional internal-combustion locomotives. Research on this technology can realize China's "curving overtaking" in automotive technology. In addition, research on new energy vehicles is also in line with the country's industrial policy and development direction. Batteries are the core and soul of new energy vehicles, which determine the various indicators of new energy vehicles. Only by mastering battery technology can we truly master ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/0525
CPCY02E60/122H01M4/667H01M10/052Y02E60/10
Inventor 姜涛常潇然陈慧明张克金安宇鹏
Owner CHINA FIRST AUTOMOBILE
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