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Current collector, preparation method of current collector and lithium ion battery comprising current collector

A current collector and positive electrode current collector technology, which is applied in the direction of battery electrodes, secondary batteries, electrode carriers/collectors, etc., can solve problems such as not significantly improving the safety performance of lithium-ion batteries

Active Publication Date: 2016-03-02
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, neither of them significantly improved the safety performance of lithium-ion batteries.

Method used

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  • Current collector, preparation method of current collector and lithium ion battery comprising current collector
  • Current collector, preparation method of current collector and lithium ion battery comprising current collector
  • Current collector, preparation method of current collector and lithium ion battery comprising current collector

Examples

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preparation example Construction

[0039] The present invention also relates to a method for preparing the current collector, comprising the following steps:

[0040] Prepare an aqueous solution containing a thickener, a conductive agent and a binder, the solid content of the thickener, a conductive agent and a binder is 1 to 10%, preferably 5 to 10%; and then coated on the positive current collector and / or At least one side of the negative electrode current collector, preferably on both sides of the current collector, and finally dried at 85°C to obtain a current collector with a conductive paste coating;

[0041] At least one of the PEDOT:PSS polymers shown in formula I, formula II or formula III is dissolved in an aqueous solution with a solid content of 1 to 10%, preferably 5 to 10%; On at least one side of the positive electrode current collector and / or the negative electrode current collector, after drying, a double-coated current collector is obtained. The thickener can be selected from CMC, the conduct...

Embodiment 1

[0048] (1) Preparation of PEDOT:PSS coated current collector

[0049] First of all, take CMC, Super-P (product name: Super-P conductive carbon black, manufacturer: Swiss Temigo), SBR according to the weight ratio of 10:60:30 to configure the slurry, the solvent is deionized water, The solid content is 10%, evenly coated on both sides on 10μ copper foil (negative electrode current collector raw material) or 12μ aluminum foil (positive electrode current collector raw material), the single-layer coating thickness is 1μm, and dried to obtain a conductive paste coating the current collector;

[0050] Secondly, the polymer PEDOT:PSS (Formula 1) was dissolved in water with a solid content of 10%, and double-sided uniform coating was applied to the positive or negative electrode current collector that had been coated with a conductive agent. The thickness of the single-layer coating was 1 μm. Dry to obtain a double-coated current collector. The SEM images are as follows figure 2 a...

Embodiment 2～29

[0060] Examples 2-29 Prepare double-coated current collectors and lithium-ion batteries in the same manner as in Example 1, and the conductive paste coating is the same; the difference is: the structural formula of PEDOT:PSS polymer is different, and / or PEDOT : PSS coating thickness is different. The details are shown in Table 1.

[0061] Table 1: Properties of positive and negative electrode collectors in Examples 2-21

[0062]

[0063]

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a current collector, a preparation method of the current collector and a lithium ion battery comprising the current collector. The current collector comprises a two-layer coating which includes a conductive slurry coating and a conductive polymer PEDOT (poly(3,4-ethylenedioxythiophene)):PSS (poly(styrenesulfonate)) coating from inside to outside. The two-layer coating of the current collector has high electrical conductivity at the room temperature, and the electrical conductivity is reduced abruptly at a high temperature. When thermal shock, over-charging and short-circuited failure happen to the lithium ion battery using the current collector, the temperature rises to be higher than 100 DEG C abruptly, the electron conductivity of the two-layer coating is reduced abruptly, transmission of electrons on the current collector is quickly and effectively limited, an electron source for reactions in the battery is cut off, and in-site overheat protection is provided for the battery in time.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a current collector, a preparation method thereof and a lithium ion battery containing the current collector. Background technique [0002] In the rapidly developing information age, the demand for mobile phones, notebooks, cameras and other electronic products is increasing year by year. As the working power source of electronic products, lithium-ion batteries have the characteristics of high energy density, no memory effect, and high working voltage, and are gradually replacing traditional Ni-Cd and MH-Ni batteries. However, with the expansion of market demand for electronic products and the development of power and energy storage equipment, people's safety requirements for lithium-ion batteries continue to increase, which is also one of the bottlenecks currently restricting the development of lithium-ion batteries. [0003] At present, the measures used to impro...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/663H01M4/667H01M10/0525Y02E60/10
Inventor 陈培培付成华吉惟肖艾新平李永坤唐超
Owner DONGGUAN AMPEREX TECH
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