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Electrode for lithium battery, preparation method thereof, and lithium battery containing the electrode

A lithium battery and electrode technology, which is applied in the field of electrodes and their preparation methods and lithium batteries containing the electrode, can solve the problems of conformality/inhibition of volume change, battery capacity attenuation, SEI film thickening, etc. at the same time, to achieve Inhibit the cracking of the pole piece, reduce the consumption of electrolyte, and improve the effect of cycle performance

Active Publication Date: 2021-07-27
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 thereof, and lithium battery containing the electrode
  • Electrode for lithium battery, preparation method thereof, and lithium battery containing the electrode
  • Electrode for lithium battery, preparation method thereof, and lithium battery containing the electrode

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preparation example Construction

[0043] One embodiment of the present invention also provides the preparation method of above-mentioned lithium battery electrode, it comprises the following steps:

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

[0045] (2) Coating the active material slurry and the polymer glue on the current collector by simultaneous coating, wherein the active material slurry is below (close to the current collector) and the polymer glue is above; or Firstly, the active material slurry is coated on the current collector, and after drying and rolling, the current collector with the active material coating is immersed in the polymer glue or the polymer glue is coated on the active material coating. on the current collector of the layer;

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

Embodiment 1

[0052] Such as 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; Wherein, the current collector 1 is made of battery-grade copper foil; the electrochemically active layer 2 is made of the following components by weight percentage: 95% silicon-based negative electrode material, 4% binder, and 1% 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 lithium battery electrode of this embodiment, the porosity of the modified layer 3 is 5%, and the thickness of the modified layer 3 is 500 nm.

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

[0055] (1) dissolving / dispersing the mate...

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 described in this embodiment is the same as that in Embodiment 1, specifically as follows figure 1 shown. The electrode for the lithium battery described in this embodiment is different from the electrode for the lithium battery described in Embodiment 1 only in that: in this embodiment, the material of the current collector 1 is a carbon-coated foil material; the material of the electrochemically active layer 2 is made of The following components are composed in weight percent: 90% of tin-based negative electrode material, 8% of binder, and 2% of conductive agent; the modification layer 3 is formed by lithium ion exchange polymer, and the lithium ion exchange polymer is nafion-Li.

[0063] In the lithium battery electrode of this embodiment, the porosity of the modified layer 3 is 3%, and the thickness of the modified layer 3 is 5...

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Abstract

The invention relates to an electrode for a lithium battery, a preparation method thereof and a lithium battery containing the electrode, belonging to the technical field of batteries. The lithium battery electrode of the present invention includes a current collector, an electrochemically active layer disposed on the current collector, and a modification layer coated on the outer surface of the electrochemically active layer; the material of the electrochemically active layer includes In the electrode active material, the modification layer is formed of lithium ion exchange polymer. The electrode for lithium battery of the present invention adopts lithium ion exchange polymer as the modification layer to coat the electrochemically active layer, and the modification layer has better shape retention to the electrode, thereby to a certain extent suppressing material pulverization caused by volume change , and inhibit the cracking of the pole piece; at the same time, the lithium ion exchange capacity can also ensure the lithium ion transmission rate in the electrochemical process and reduce the influence of the coating on the impedance.

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 automobile 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 with a lithium-ion battery energy density of 300Wh / kg in 2020, it is almost inevitable to choose a lithium-ion battery chemistry system containing silicon / tin negative electrodes. Silicon / tin-based negative electrode materials have high specific capacity, but during the charging and discharging process, the huge and repeated ...

Claims

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Application Information

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Patent Type & Authority Patents(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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