Electrode plate activation method for negative electrode based on passivation metal lithium powder

A passivation metal and activation method technology, applied in electrode manufacturing, battery electrodes, electrode rolling/calendering, etc., can solve problems such as hindering the extraction of metal lithium lithium ions and increasing battery internal resistance, so as to increase electrochemical activity and process Simple and environmentally friendly, the effect of ultra-high electrochemical gram capacity

Inactive Publication Date: 2017-05-10
武汉理工力强能源有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The existence of the passivation layer will hinder the extraction of lithium ions in the electrolyte and increase the internal resistance of the battery

Method used

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  • Electrode plate activation method for negative electrode based on passivation metal lithium powder
  • Electrode plate activation method for negative electrode based on passivation metal lithium powder
  • Electrode plate activation method for negative electrode based on passivation metal lithium powder

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Embodiment 1

[0022] Example 1, see Figure 1 to Figure 3 :

[0023] The invention provides a method for activating an electrode sheet based on a passivated metal lithium powder negative electrode, comprising the following steps:

[0024] 1) The SBR / toluene solution containing the lithium metal powder with a mass concentration of 2% is uniformly coated on the graphite electrode sheet with the copper sheet as the current collector by a coating machine to obtain the lithium metal powder / graphite / copper electrode sheet;

[0025] 2) Transfer the metal lithium powder / graphite / copper electrode sheet to an argon-protected glove box, dry at 60°C for 4 hours, and set aside;

[0026] 3) Roll the dried metal lithium powder / graphite / copper electrode sheet (total thickness 92 microns) in an argon-protected glove box with a roller press, and control the roll gap of the roller press to 60 microns, so that the lithium metal The powder / graphite / copper electrode sheet passes through the roll gap at a const...

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Abstract

The invention provides an electrode plate activation method for a negative electrode based on passivation metal lithium powder. The electrode plate activation method comprises the following steps of uniformly coating a graphite electrode plate, which takes a copper sheet as a current collector, with a metal lithium powder-containing butadiene styrene rubber/methylbenzene solution through a coating machine to obtain a metal lithium powder/graphite/copper electrode plate; transferring the electrode plate to a glove box under protection of argon, and drying; performing rolling and activating on the dried electrode plate in the glove box under protection of argon by adopting a roller press; and preserving the rolled and activated electrode plate in the glove box under protection of argon for use. According to the electrode plate activation method, the rolling pressure loaded on the electrode plate is controlled through the roller press, the passivation layer-containing metal lithium powder is smashed through mechanical external force, and more metal lithium surfaces can be exposed, so that the electrochemical activity of the metal lithium powder can be improved, and the metal lithium powder-based lithium ion battery performance can be improved; and the electrode plate activation method has the characteristics of simple and environment friendly process, capability of realizing large-scale production easily, super-high electrochemical capacity per gram and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemical material manufacturing, in particular to an electrode sheet activation method based on a passivated metal lithium powder negative electrode. Background technique [0002] Lithium-ion batteries are popular as power sources for mobile devices due to their high energy density, light weight, and long life. In 1991, Sony Corporation commercialized lithium-ion batteries for the first time, which has since opened up a global research boom in lithium-ion battery materials. However, as far as the energy density of the lithium-ion battery itself is concerned, its capacity is closely related to the type of electrode material. The development of high-capacity electrode materials has always been one of the core tasks of lithium-ion battery workers around the world. Graphite is currently widely used as an anode material for lithium-ion batteries, but its theoretical capacity is only 372mAh / g, which re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1395
CPCH01M4/0404H01M4/0435H01M4/1395Y02E60/10
Inventor 吴黎明葛耀闻
Owner 武汉理工力强能源有限公司
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