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Lithium element supplementing method for electrode of lithium ion battery

A lithium-ion battery and electrode technology, applied in the field of lithium-ion batteries and electrochemistry, can solve problems such as difficulty, difficulty in large-scale use, control of electrodeposition methods, etc., and achieve the effect of improving discharge capacity and easy large-scale application.

Inactive Publication Date: 2014-07-23
徐兆清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, from the perspective of actual battery production, the above methods all have shortcomings, such as very high manufacturing costs of lithium powder, harsh requirements for use, and difficult control of electrodeposition methods, which are not easy to use on a large scale, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using 100ml of a mixed solution of tetrahydropyran and cyclohexane as a solvent (in which tetrahydropyran accounts for 25% of the solvent volume), 30g of metal lithium wire is thrown into the solvent, and the solution is stirred for 24 hours, and the remaining lithium wire is taken out , to obtain the required lithium solution. Under the protection of an inert gas, immerse the silicon electrode in the lithium solution. After a certain period of time (about 5 minutes to 10 minutes), take out the electrode, and then dry it at 80°C for about 20 minutes under negative pressure to completely volatilize the solvent. Lithium-supplemented electrodes. Then, according to the manufacturing process of the lithium-ion battery, the lithium-supplemented electrode can be applied and combined with other battery components to assemble a lithium-ion battery.

Embodiment 2

[0044] Using 100ml of a mixed solution of tetrahydrofuran and naphthalene as a solvent (wherein tetrahydrofuran accounts for 50% of the solvent volume), 20g of metal lithium flakes were thrown into the solvent for 24 hours, and the remaining lithium flakes were taken out to obtain the required lithium solution. Under the protection of an inert gas, immerse the tin alloy electrode in the lithium solution. After a certain period of time (about 10min-20min), take the electrode out, put it in a vacuum oven and dry it at 100°C for about 5 hours, and then obtain the lithium-supplemented electrode. electrode sheet. Then, according to the manufacturing process of the lithium-ion battery, the lithium-supplemented electrode can be applied and combined with other battery components to assemble a lithium-ion battery.

Embodiment 3

[0046] In an environment of -40°C, 100ml of a mixed solution of ethylene glycol dimethyl ether and liquid ammonia is used as a solvent (wherein ethylene glycol dimethyl ether accounts for 70% of the solvent volume), and 20g of lithium metal powder is thrown into the solvent , and the solution was stirred for 24 hours, and the remaining lithium powder was taken out to obtain the required lithium solution. Under the protection of an inert gas, immerse the silicon-carbon composite electrode in the lithium solution. After a certain period of time (about 10 seconds to 30 seconds), take out the electrode, and then dry it at 20°C for about 1 min under the protection of an inert gas to completely dissolve the solvent. Volatilize to obtain a lithium-supplemented electrode sheet. Then, according to the manufacturing process of the lithium-ion battery, the lithium-supplemented electrode can be applied and combined with other battery components to assemble a lithium-ion battery.

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Abstract

The invention aims at providing a method for supplementing lithium element in a new lithium ion battery. A liquid solution method is used for supplementing lithium for an electrode which needs to supplement with lithium element, and the lithium element supplementing method has better process feasibility. The method comprises the following steps: preparing a solvent which can dissolve metal lithium, and dissolving the metal lithium to form a lithium solution; enabling an electrode sheet to be in full contact with the lithium solution and enabling the lithium solution to infiltrate into the electrode; removing the solvent in the electrode sheet to obtain the electrode sheet after lithium supplementation. By adopting the method provided by the invention, the lithium element can be added into the electrode sheet, and the discharge capacity of the lithium ion battery assembled by the electrode can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, in particular to the technical field of lithium ion batteries. The invention relates to a method for replenishing lithium elements in an electrode in a lithium ion battery, and a lithium ion battery prepared by using the electrode. Background technique [0002] Lithium-ion batteries are the secondary batteries with the highest energy in commercial batteries today. The current research on this battery is mainly to continue to increase the energy density of batteries by using electrode materials with higher energy densities. Among the high energy density materials studied, some materials do not contain lithium in their initial state, and they obtain lithium during the battery reaction, such as the negative electrode material Si, which transforms into a LiSi compound during charging. When electrodes made of these materials are used, another electrode used in conjunction with them often nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139
CPCH01M4/139H01M4/382H01M10/0525Y02E60/10
Inventor 徐兆清
Owner 徐兆清
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