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Negative electrode, secondary battery and preparation method of negative electrode

A secondary battery and negative electrode technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of battery cycle performance decline, metal electrode powdering, metal negative electrode failure corrosion, etc., to reduce Effect of Galvanic Corrosion Interface

Pending Publication Date: 2022-05-27
北京恩力动力技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in a battery system using a metal negative electrode, there is a galvanic corrosion interface between the current collector and the metal active material in the non-aqueous electrolyte. The existence of the metal active material at the contact position will cause the generation of dendrites during the charging and discharging process of the battery. On the one hand, the dendrites are easy to cause a micro-short circuit in the battery. On the other hand, some dendrites with broken interfaces will be deactivated, causing the powdering of the metal electrode Causes rapid degradation of battery cycle performance

Method used

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  • Negative electrode, secondary battery and preparation method of negative electrode
  • Negative electrode, secondary battery and preparation method of negative electrode
  • Negative electrode, secondary battery and preparation method of negative electrode

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other Embodiment approach

[0136] An example of other implementations

[0137] In the present embodiment, an example of the negative electrode 940 has been described by taking the case where the interface protective layer 930 is provided on the side surface 342 of the negative electrode active material layer 340 as an example. However, the negative electrode 940 is not limited to this embodiment. In other embodiments, the interface protective layer 930 is provided to cover the side surface 342 of the negative electrode active material layer 340 and one end of at least one of the first plane 344 and the second plane 346 of the negative electrode active material layer 340 .

[0138] Figure 10 is a schematic diagram of one example of the negative electrode 1040 . Figure 10 is a schematic diagram of an example of a top view 1002 and a cross-sectional view 1004 of the negative electrode 1040 . Cross-sectional view 1004 is an example of a cross-section AA' in top view 1002.

[0139] In this embodiment, ...

other Embodiment approach

[0158] An example of other implementations

[0159] In the present embodiment, an example of the negative electrode 1540 has been described by taking the case where the negative electrode active material layer 340 is filled in the recessed portion 1532 as an example. However, the negative electrode 1540 is not limited to this embodiment. In other embodiments, a conductive material different from the material constituting the negative electrode active material layer 340 may be provided in the recessed portion 1532 . In another embodiment, when the thickness of the negative electrode support body 1530 is smaller than the thickness of the negative electrode current collector 320 , the same material as the interface protective layer 930 or the interface protective layer 1030 can be provided in the recessed portion 1532 . An insulating material is provided within the recessed portion 1532 . When the thickness of the negative electrode support body 1530 is smaller than that of the...

other Embodiment approach

[0167] An example of other implementations

[0168] In the present embodiment, an example of the electrode structure 1710 has been described by taking a case where the electrode structure 1710 includes a single positive electrode cap 122 and a single negative electrode cap 142 as an example. However, the electrode structure 1710 is not limited to this embodiment. In other embodiments, the electrode structure 1710 may have a plurality of negative electrode caps 142 . In addition, the electrode structure 1710 may have a plurality of positive electrode caps 122 .

[0169] Figure 18 is a schematic diagram of an example of a method of manufacturing the negative electrode 140 . According to the present embodiment, first, in step 1812 (“step” is also represented by “S”), the negative electrode current collector 320 and the negative electrode active material layer 340 are prepared. As the negative electrode current collector 320, a plate-like metal or conductive resin in which th...

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Abstract

The invention relates to a negative electrode, a secondary battery and a preparation method of the negative electrode, and belongs to the field of batteries, and the negative electrode comprises a current collector and an active material layer containing a negative electrode active material. Wherein a part of the current collector is embedded in the active material layer, so that the current collector is connected with the active material layer, and the connection mode greatly reduces a galvanic corrosion interface of the metal active material and the current collector in the non-aqueous electrolyte on the basis of ensuring the electrode confluence effect.

Description

technical field [0001] The present invention relates to the field of batteries, in particular to a negative electrode, a secondary battery, and a method for preparing the negative electrode. Background technique [0002] In the process of battery application, higher energy density requirements are constantly faced. When traditional lithium-ion batteries use carbon anodes or silicon anodes, the energy density has approached the theoretical limit. Metal negative electrodes generally have a high theoretical gram capacity, and with the positive electrode of the original system, the weight ratio of active materials in the entire battery system can be greatly increased, thereby improving the energy density of the battery. The theoretical gram capacity of lithium metal electrode is 3860mAh / g, which is much higher than the theoretical gram capacity of carbon negative electrode and silicon negative electrode. With high nickel positive electrode material, the battery system can easily...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/571H01M50/536H01M4/13H01M4/139H01M10/0525
CPCH01M50/571H01M50/536H01M4/13H01M4/139H01M10/0525Y02P70/50Y02E60/10
Inventor 黄飞孙文彬姚猛高桥勉车勇戴翔
Owner 北京恩力动力技术有限公司