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Electrode for lithium battery, preparation method of electrode and lithium battery containing electrode

A lithium battery and electrode technology, which is applied in the field of electrodes and their preparation methods and lithium batteries containing the electrodes, can solve the problems of not being able to take into account the conformability/suppression of volume changes, the thickening of the SEI film, and the complex production process, etc. The effect of suppressing pole piece cracking, improving cycle performance, and high degree of coating

Active Publication Date: 2020-08-04
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Most of the existing mass-produced lithium battery pole piece designs, when using silicon / tin-containing negative electrode materials, or sulfur-containing positive electrode materials, due to the large expansion / contraction of the active material during charging and discharging, repeated volume changes are easy. It causes the pole piece to crack, the material is pulverized, and further falls off from the current collector. At the same time, the SEI film will continue to thicken and consume the electrolyte, resulting in battery capacity attenuation and pole piece deactivation.
Some advanced research also adds a conductive layer or polymer layer on the active material layer, but most of them cannot take into account conformality / inhibition of volume change and sufficient lithium ion transport channels at the same time, or most of the production processes are more complicated

Method used

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  • Electrode for lithium battery, preparation method of electrode and lithium battery containing electrode
  • Electrode for lithium battery, preparation method of electrode and lithium battery containing electrode
  • Electrode for lithium battery, preparation method of electrode and lithium battery containing electrode

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preparation example Construction

[0043] An embodiment of the present invention also provides a method for preparing the above-mentioned electrode for a lithium battery, comprising the following steps:

[0044] (1) dissolving / dispersing the material of the electrochemical active layer in solvent A to obtain active material slurry; at the same time, dissolving lithium ion exchange polymer in solvent B to obtain polymer glue;

[0045] (2) Coat the active material slurry and the polymer glue on the current collector by means of simultaneous coating, wherein the active material slurry is below (close to the current collector) and the polymer glue is above; or , first coat the active material slurry on the current collector, dry and roll the current collector and then dip the current collector with the active material coating in the polymer glue or coat the polymer glue on the active material coating on the current collector of the layer;

[0046] (3) performing drying treatment to obtain the electrode for the lit...

Embodiment 1

[0052] like figure 1 As shown, an electrode for a lithium battery according to an embodiment of the present invention includes a current collector 1, an electrochemically active layer 2 disposed on the current collector 1, and a modification layer 3 coated on the outer surface of the electrochemically active layer 2; Among them, the material of the current collector 1 is battery-grade copper foil; the material of the electrochemical active layer 2 is composed of the following components by weight: 95% of silicon-based negative electrode material, 4% of binder, and 1% of conductive agent; The modification layer 3 is formed of a lithium ion exchange polymer, and the lithium ion exchange polymer is nafion-Li.

[0053] In the electrode for a lithium battery of this embodiment, the porosity of the modification layer 3 is 5%, and the thickness of the modification layer 3 is 500 nm.

[0054] The preparation method of the electrode for lithium battery of the present embodiment is:

...

Embodiment 2

[0062] An electrode for a lithium battery according to an embodiment of the present invention, the structure of the electrode for a lithium battery in this embodiment is the same as that of Embodiment 1, and the details are as follows: figure 1 shown. The difference between the electrode for lithium battery in this embodiment and the electrode for lithium battery in Embodiment 1 is only that: in this embodiment, the material of the current collector 1 is carbon-coated foil; the material of the electrochemical active layer 2 is made of The following components are composed of the following weight percentages: 90% of tin-based negative electrode material, 8% of binder, and 2% of conductive agent; the modification layer 3 is formed of lithium ion exchange polymer, and the lithium ion exchange polymer is nafion-Li.

[0063] In the electrode for a lithium battery of this embodiment, the porosity of the modification layer 3 is 3%, and the thickness of the modification layer 3 is 50 ...

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Abstract

The invention relates to an electrode for a lithium battery, a preparation method of the electrode and the lithium battery containing the electrode, and belongs to the technical field of batteries. The electrode for the lithium battery comprises a current collector, an electrochemical active layer arranged on the current collector and a modification layer coating the outer surface of the electrochemical active layer, wherein the material of the electrochemical active layer comprises an electrode active material, and the modification layer is formed by a lithium ion exchange polymer. Accordingto the electrode for the lithium battery, the lithium ion exchange polymer is used as the modification layer to coat the electrochemical active layer, and the modification layer has relatively good conformality for the electrode, so that material pulverization caused by volume change is inhibited to a certain extent, and cracking of a pole piece is inhibited; and meanwhile, the lithium ion exchange capacity can also guarantee the lithium ion transmission rate in the electrochemical process, and the influence of the coating on impedance is reduced.

Description

technical field [0001] The invention relates to an electrode, a preparation method thereof, and a lithium battery containing the electrode, in particular to an electrode for a lithium battery, a preparation method thereof, and a lithium battery containing the electrode. Background technique [0002] In recent years, lithium-ion batteries have been widely used in the field of new energy vehicles. With the development of the new energy vehicle industry, people have put forward higher and higher requirements for the performance of lithium-ion batteries, especially the energy density. [0003] In order to achieve the battery design and performance goals of lithium-ion battery energy density reaching 300Wh / kg in 2020, it is almost inevitable to choose a lithium-ion battery chemical system containing silicon / tin negative electrode. The silicon / tin-based negative electrode material has high specific capacity, but during the charging and discharging process, the electrode stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/62H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M4/366H01M4/628H01M10/052Y02E60/10
Inventor 何娜李进梅骜唐道平李根徐峤
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD
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