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Pole piece and lithium battery

A pole piece and positive pole piece technology, applied in the field of lithium batteries and the pole pieces used, can solve the problems of reduced active material load, inability to take into account battery energy density performance and long cycle performance at the same time, etc., so as to reduce replacement frequency and improve Market competitiveness and the effect of improving liquid retention

Pending Publication Date: 2021-12-07
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for batteries with this structure, due to the addition of electrolyte conductive substances in the electrode diaphragm, the load of active materials in the electrode diaphragm will inevitably decrease, and it is impossible to take into account the energy density performance and long cycle performance of the battery at the same time.

Method used

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  • Pole piece and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1. Preparation of electrode collectors; in this example, aluminum foil and copper foil are used as the electrode collectors of the positive electrode and the electrode collectors of the negative electrode, respectively, and are prepared on the copper foil and the aluminum foil by punching. Pores, the total area of ​​the storage holes is 20% of the current collector area of ​​the pole piece; the conductive porous substances are filled in the storage holes, the conductive porous substances used in this embodiment are carbon nanotubes, and the conductive porous substances are used for electrolysis Liquid storage tank;

[0027] Step 2, prepare the positive electrode sheet; first prepare the positive electrode slurry, the ratio of lithium cobaltate (positive electrode active material), polyvinylidene fluoride (binder), and acetylene black (conductive agent) is 97%: 2%: 1%. Prepared into slurry, the prepared slurry has a solid content of 75%; the positive electrode slurr...

Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 lies in that the total area of ​​the storage holes on the pole piece current collector in this embodiment is 30% of the area of ​​the pole piece current collector.

Embodiment 3

[0034] The difference between this embodiment and Embodiment 1 lies in that the total area of ​​the storage holes on the pole piece current collector in this embodiment is 40% of the area of ​​the pole piece current collector.

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Abstract

The invention discloses a pole piece and a lithium battery. The pole piece comprises a pole piece current collector and an active substance arranged on the surface of the pole piece current collector; and at least one storage hole is formed in the pole piece current collector, the storage hole is filled with a conductive porous substance, and electrolyte is stored in the conductive porous substance. The current collector of the pole piece is provided with the holes in any shape, the holes are filled with the conductive porous substance, the filled conductive porous substance is used as a storage bin of the electrolyte, and after the electrolyte is injected into the battery, the conductive porous substance can absorb and store part of the electrolyte, so that the electrolyte retention capacity of the battery is improved, the electrolyte stored by the conductive porous material is gradually separated out in the use cycle process of the battery, electrolyte consumption in the cycle process is supplemented for the battery, and then the cycle life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium battery with long cycle life and pole pieces used therein. Background technique [0002] In recent years, with the application and development of consumer electronics, electric vehicles, aerospace and other equipment industries, higher demands have been placed on the long-term cycle performance of the batteries used. It is imperative to prolong the service life of the battery and reduce the frequency of battery replacement, thereby reducing the cost of battery use. Universities, scientific research institutions, and lithium battery manufacturers have invested a lot of manpower and material resources for this, and long-cycle and long-life batteries are currently one of the most popular research directions in the field of lithium batteries. [0003] Long-cycle batteries mainly improve the long-term cycle performance of batteries by developing ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/682H01M4/13H01M10/0525
CPCH01M50/682H01M4/13H01M10/0525H01M2004/021Y02E60/10
Inventor 田奎邹浒何志佳王清辉朱威肖良曹昊楠
Owner ZHUHAI COSMX BATTERY CO LTD
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