Preparation method of polyimide composite material and application of polyimide composite material in battery

A polyimide and composite material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electrical conductivity and poor battery electrochemical performance, and achieve the effect of high cost

Active Publication Date: 2019-12-03
NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to one aspect of the present application, a preparation method of a polyimide composite material is provided, which solves the problem that the poor electrical conductivity of the existing negative electrode material leads to poor electrochemical performance of the battery. Additional conductive agent with excellent performance

Method used

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  • Preparation method of polyimide composite material and application of polyimide composite material in battery
  • Preparation method of polyimide composite material and application of polyimide composite material in battery
  • Preparation method of polyimide composite material and application of polyimide composite material in battery

Examples

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Effect test

Embodiment 1

[0109] The preparation of embodiment 1 polyimide composite material

[0110]Step A: add superconducting carbon black (Super P) of polyimide synthesis amount 5% in small beaker, then add the sodium carboxymethyl cellulose (CMC) of superconducting carbon black (Super P) content 1.5%, Add 20mL solvent N,N-dimethylformamide (DMF) and magnetically stir for 10min, then transfer to an ultrasonic wave for ultrasonic dispersion for 30min.

[0111] Step B: Add 1,4,5,8-naphthalene tetracarboxylic anhydride powder and ethylenediamine solution in the N,N-dimethylformamide (DMF) solution at a molar ratio of 1:1, keep magnetic stirring, and then Add the mixture from step A. It was carried out in a glass flask protected by an argon atmosphere. The flask was transferred to a 50°C oil bath, and the temperature was gradually raised to 150°C, and the reaction was carried out at this temperature for 4h.

[0112] Step C: Collect the product, centrifuge, and remove the supernatant. For the centr...

Embodiment 2

[0114] The preparation of embodiment 2 polyimide composite material

[0115] The specific operation is the same as in Example 1, the difference is that step A is: add superconducting carbon black (Super P) with a polyimide synthesis amount of 10% in a small beaker, and the obtained polyimide composite material is designated as sample 2.

Embodiment 3

[0118] The preparation of embodiment 3 half cell

[0119] half cell

[0120] Electrolyte: 2.0M lithium sulfate (Li 2 SO 4 ) aqueous solution

[0121] Diaphragm: glass fiber filter paper (porosity below 1 micron, thickness about 260 microns)

[0122] Positive electrode: polyimide-based carbon-based composite electrode

[0123] Negative electrode: activated carbon cloth

[0124] Preparation process: negative electrode case / negative electrode / diaphragm / positive electrode / gasket / shrapnel / positive electrode case. After assembly, use a button battery sealing machine to seal under a pressure of 1500Kg. .

[0125] Half-cell 1-1, half-cell 1-2, and half-cell 1-D1 were obtained by using sample 1 in Example 1, sample 2 in Example 2, and sample D1 in Comparative Example 1, respectively.

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Abstract

The invention discloses a preparation method of a polyimide composite material. The preparation method comprises the following steps of: a) obtaining dispersion liquid containing superconducting carbon black, a dispersing agent and a polyimide monomer; b) reacting the dispersion liquid in an inert atmosphere at a temperature of 140-150 DEG C for 4-8 hours, performing separating, washing and dryingto obtain dry powder; and c) sintering the dry powder for 8-12 hours at a temperature of 300-350 DEG C in an inert atmosphere to obtain the polyimide composite material, wherein the non-active atmosphere is selected from at least one of nitrogen, helium and argon. The invention also provides application of the polyimide composite material in a battery. The carbon-based material used in the methodis common conductive carbon, has the cost advantage compared with graphene, carbon nanotubes and other conductive substances, and can easily make the polyimide material be compounded in situ to formthe composite material with a high specific surface area.

Description

technical field [0001] The application relates to a preparation method of a polyimide composite material, which belongs to the field of material preparation. Background technique [0002] Traditional lithium-ion batteries use organic electrolytes. Organic electrolytes are easy to burn and the reaction between electrode materials and electrolytes causes thermal runaway, which poses major safety issues. In addition, in the manufacturing process, the harsh conditions of anhydrous and oxygen-free, the cost of lithium-ion batteries is relatively high. Aqueous lithium-ion batteries are water-based battery systems, and aqueous electrolytes usually use inorganic lithium salts, such as Li 2 SO 4 、LiNO 3 etc. The price of this raw material is generally low, and the source channels are extensive. Aqueous lithium-ion batteries solve several important problems faced by traditional lithium-ion batteries: 1. It fundamentally solves the phenomenon that the organic electrolyte is easy to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/60H01M4/62H01M10/36
CPCH01M4/362H01M4/608H01M4/625H01M10/36H01M2004/021Y02E60/10
Inventor 王敏刚李忆非张旭锋王晓东王耀国
Owner NINGBO FENGCHENG ADVANCED ENERGY MATERIALS RES INST CO LTD
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