Positive electrode sheet of lithium ion capacitor, lithium ion capacitor and negative electrode lithium pre-intercalation method thereof

A lithium ion and capacitor technology, applied in the field of lithium ion capacitors, can solve the problems of shortened battery cycle life and peeling off of the positive electrode coating layer, and achieve the effects of long cycle life, improved energy density, and long cycle life

Inactive Publication Date: 2019-09-17
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome that the positive electrode coating layer in the prior art is a single-layer structure. When the pre-lithiation agent in the positive electrode coating layer is consumed by pre-intercalating lithium, there will be Pores make the positive electrode coating layer easy to fall off from the aluminum foil, and then lead to the defect of shortening the cycle life of the battery, thereby providing a positive electrode sheet of a lithium ion capacitor, a lithium ion capacitor and a negative electrode pre-embedded lithium method

Method used

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  • Positive electrode sheet of lithium ion capacitor, lithium ion capacitor and negative electrode lithium pre-intercalation method thereof
  • Positive electrode sheet of lithium ion capacitor, lithium ion capacitor and negative electrode lithium pre-intercalation method thereof
  • Positive electrode sheet of lithium ion capacitor, lithium ion capacitor and negative electrode lithium pre-intercalation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-9

[0055] Embodiments 1-9 relate to a lithium ion capacitor, and the lithium ion capacitor is prepared according to the following steps:

[0056] S1: Preparation of negative electrode sheet: Mix soft carbon, conductive carbon black and PVDF according to a certain mass ratio, and evenly disperse them into N-methylpyrrolidone to prepare a slurry, and then coat the slurry on the copper foil, pass Drying, rolling, slitting and other processes are used to make negative electrode sheets.

[0057] S2: Preparation of positive electrode sheet: Mix activated carbon, conductive carbon black, and PVDF according to a certain mass ratio, and evenly disperse them into N-methylpyrrolidone to prepare a slurry, and then coat the slurry on aluminum foil. Rolling, slitting and other processes are used to form a positive electrode current collector coated with a coating layer of positive electrode active material, and then lithium nitride and PVDF are mixed in a glove box filled with high-purity argo...

Embodiment 10

[0064] This embodiment relates to a lithium ion capacitor, and the lithium ion capacitor is prepared according to the following steps:

[0065] S1. Preparation of negative electrode sheet: Mix soft carbon, conductive carbon black, and PTFE in a mass ratio of 8:1:1, and evenly disperse them into N-methylpyrrolidone to prepare a slurry, and then coat the slurry on the copper foil Then, through drying, rolling, slitting and other processes, the negative electrode sheet is made.

[0066] S2. Preparation of positive electrode sheet: Mix activated carbon, conductive carbon black, and PTFE in a mass ratio of 8:1:1, and evenly disperse them into N-methylpyrrolidone to prepare a slurry, and then coat the slurry on aluminum foil, Through drying, rolling, slitting and other processes, the positive electrode current collector coated with the positive electrode active material coating layer is made, and then lithium nitride and PTFE are mixed in a glove box filled with high-purity argon ac...

Embodiment 11

[0071] This embodiment relates to a lithium ion capacitor, and the lithium ion capacitor is prepared according to the following steps:

[0072] S1. Preparation of negative electrode sheet: Mix soft carbon, conductive carbon black, and CMC in a mass ratio of 7:2:1, and evenly disperse them into an aqueous solution to prepare a slurry, then coat the slurry on the copper foil, and dry it by drying , rolling, slitting and other processes to make negative electrode sheets.

[0073]S2. Preparation of positive electrode sheet: Activated carbon, conductive carbon black, and CMC are mixed in a mass ratio of 7:1:2, and uniformly dispersed into an aqueous solution to obtain a slurry, and then the slurry is coated on an aluminum foil, dried and rolled Pressing, slitting and other processes are used to make a positive electrode current collector coated with a coating layer of positive active material, and then in a glove box filled with high-purity argon gas, lithium nitride and PVDF are m...

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Abstract

The present invention relates to the field of lithium ion capacitors and particularly to a positive electrode sheet of a lithium ion capacitor, a lithium ion capacitor and a negative electrode lithium pre-intercalation method thereof. The positive electrode sheet includes a positive electrode current collector and a positive electrode coating layer, wherein the positive electrode coating layer a positive electrode active material coating layer coating the positive electrode current collector and a pre-lithiation agent coating layer coating the positive electrode active material coating layer; the positive electrode active material coating layer is composed of a material including a positive electrode active material, a conductive agent, and a binder; and the pre-lithiation agent coating layer is composed of a material including a pre-lithiation agent and a binder. After the lithium pre-intercalation of the negative electrode is completed, the positive electrode active material coating layer can still be maintained as a complete coating layer. Thus, it can be prevented that the positive electrode coating layer in the prior art is likely to fall off from the positive electrode current collector due to the occurrence of voids. As a result, the positive electrode sheet has a long cycle life so as to prolong the cycle life of the lithium ion capacitor.

Description

technical field [0001] The invention relates to the field of lithium ion capacitors, in particular to a positive electrode sheet of a lithium ion capacitor, a lithium ion capacitor and a method for pre-inserting lithium on the negative electrode. Background technique [0002] Lithium-ion capacitors are a new type of energy storage device between supercapacitors and lithium-ion batteries. It combines the advantages of both lithium-ion batteries and supercapacitors, with high energy density, high power density, fast charge and discharge and Due to its long cycle life and other characteristics, it has a wide range of application prospects in the fields of rail transit, electric vehicles, new energy power generation, aerospace and national defense and military. [0003] Lithium ion capacitor is a hybrid supercapacitor structure. It usually uses an electric double layer capacitor material with high specific surface area as the positive electrode, and the negative electrode uses a...

Claims

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Application Information

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IPC IPC(8): H01G11/06H01G11/28H01G11/50H01G11/84H01G11/86
CPCH01G11/06H01G11/28H01G11/50H01G11/84H01G11/86Y02E60/13
Inventor 张熊马衍伟孙琮凯孙现众
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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