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Negative plate for lithium ion capacitor and preparation method thereof

A negative pole piece, lithium ion technology, applied in the field of negative pole piece for lithium ion capacitors and its preparation, can solve the problem of low conductivity of lithium titanate, achieve good electrochemical performance, simple preparation process, and wide application prospects Effect

Inactive Publication Date: 2013-06-26
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the extremely low conductivity of lithium titanate, this limits the large-scale commercial application of this material to a certain extent.

Method used

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  • Negative plate for lithium ion capacitor and preparation method thereof

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preparation example Construction

[0022] Looking further, the present invention provides a method for preparing a negative electrode sheet for lithium-ion capacitors, which is characterized in that it includes the following steps: first, dissolving a binder with a mass ratio of 5%-10% in a deionized aqueous solution or N- in methylpyrrolidone. Afterwards, a conductive agent with a mass ratio of 30%-60% is added into the stirred binder solution. Subsequently, lithium titanate with a mass ratio of 30%-65% is added after stirring uniformly in a vacuum at high speed.

[0023] In order to improve the degree of fusion of various materials, it can be stirred evenly in a vacuum at a high speed again to become a negative electrode slurry. Afterwards, the negative electrode slurry was screened through a 150-mesh sieve to form a coating mixture. After the above steps are completed, the coating mixture is evenly coated on the front and back of the aluminum foil, dried and rolled, and then cut into negative electrode she...

Embodiment 1

[0025] Dissolve CMC with a mass ratio of 1.6% in deionized water, stir evenly in a vacuum at high speed, and then stand still for about 6 hours, then add conductive graphite with a mass ratio of 35% into the stirred binder solution, stir evenly in a vacuum at a high speed Add conductive carbon black with a mass ratio of 10% to the slurry, stir evenly in a vacuum at high speed and pass through a 150-mesh sieve, then add 50% lithium titanate to the sieved slurry, stir evenly in a vacuum mixer at a high speed, Then add SBR with a mass ratio of 3.4%, stir evenly to form a negative electrode slurry, and then pass the slurry through a 150-mesh sieve to evenly coat the front and back of the aluminum foil, and dry it under vacuum at 120°C for 36 hours. Cut into negative pole pieces after pressing.

[0026] The activated carbon pole piece is used as the positive electrode, and the lithium titanate pole piece is used as the negative pole. The fiber diaphragm of NKK company model TF4035...

Embodiment 2

[0028] Dissolve PVDF with a mass of 6% in NMP, stir evenly in a vacuum at high speed, and then stand still for about 6 hours, then add conductive graphite with a mass ratio of 35% to the stirred binder solution, stir evenly in a high-speed vacuum, and then add it to the slurry Add conductive carbon black with a mass ratio of 10% in the mixture, stir evenly in a vacuum at high speed and pass through a 150-mesh sieve. Afterwards, add 49% lithium titanate to the sieved slurry, stir evenly in a vacuum mixer at a high speed in a vacuum, pass the slurry through a 150-mesh sieve, and evenly coat the slurry on the front and back of the aluminum foil to prepare The obtained negative electrode sheet was dried by vacuum circulation at 120° C. for 36 hours, and then rolled and cut into negative electrode sheets. The activated carbon pole piece is used as the positive electrode, and the lithium titanate pole piece is used as the negative pole. The fiber diaphragm of NKK company model TF40...

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Abstract

The invention relates to a negative plate for a lithium ion capacitor and a preparation method of the negative plate. The negative plate comprises an aluminum foil substrate, and is characterized in that coating straps are respectively distributed on front and back surfaces of the aluminum foil substrate; and admixture comprising lithium titanate, conductive agent and bonding agent is arranged in the coating strap. When the negative plate is prepared, firstly negative pole paste is mixed, and then screening is performed, so that coating admixture is formed. The coating admixture is uniformly coated on the front and back surfaces of an aluminum foil, and the aluminum foil is subjected to drying and rolling and then is shorn into the negative plate. The preparation process is simple, and large-scale operation is easy to realize. Meanwhile, the lithium titanate negative plate shows excellent electrochemical property, and is easily used for performing energy matching with an active carbon positive plate of the lithium ion capacitor, so that the negative plate has an extensive application prospect in the lithium ion capacitor.

Description

technical field [0001] The invention relates to a pole piece and a preparation method thereof, in particular to a negative electrode pole piece for a lithium ion capacitor and a preparation method thereof. Background technique [0002] The development of modern civilization and the continuous increase of the world's population have increased the world's demand for energy. With the increasing shortage of traditional primary energy supplies such as coal and oil, and the increasing problems of global warming and ecological environment deterioration caused by fuel energy, energy issues have received more and more attention. Exploring clean and renewable new energy has become one of the important tasks in today's scientific world, and has become a major issue related to the future living conditions of human beings. Among them, supercapacitors and lithium-ion batteries have attracted widespread attention due to their excellent performance. Since its inception, it has been widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/50H01G11/86H01G11/06
CPCY02E60/13
Inventor 高立军丁帮助
Owner SUZHOU UNIV
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