Binder, and preparation method and application thereof

A binder and reaction technology, applied in the field of binder and preparation of secondary battery, can solve the problem of not being able to adapt well to the volume change of electrode active materials, insufficient resistance to electrode buffer characteristics, and decrease in battery cycle stability, etc. problem, to achieve the effect of facilitating large-scale implementation, improving the overall electrochemical performance, and outstanding cycle stability

Active Publication Date: 2016-12-07
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the large-scale production of lithium-ion secondary batteries, polyvinylidene fluoride (PVDF) is generally used as the battery electrode binder, and the organic solvent methylpyrrolidone (NMP) is used as the dispersant, although PVDF has good viscosity and electrochemical properties. Stability, but the cushioning properties to withstand the expansion and shrinkage of the electrode are not sufficient, and PVDF is only connected to the active material by weak van der Waals force, and has poor adhesion to the current collector and active material, so it cannot be well adapted to the severe conditions of the electrode active material. The volume change of the battery can easily lead to the destruction of the structure of the electrode sheet, resulting in a decrease in the cycle stability of the battery.
And if the amount of PVDF used is not large, the binder effect will not be shown, and if the amount used is too large, the amount of active material in the electrode will be relatively reduced, and as a result, it is difficult to meet the requirements of high-capacity batteries

Method used

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  • Binder, and preparation method and application thereof
  • Binder, and preparation method and application thereof
  • Binder, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of embodiment 1 binding agent

[0037] see figure 1 , the binder is synthesized in two steps, as follows:

[0038] The first step: under nitrogen protection conditions, get 4.2g dimer acid (HJ-156, Shandong Huijin Chemical Co., Ltd., mainly containing 75-82% dimer acid and 15-22% trimer acid) and 1.7g diethylene The triamine was kept at 160 degrees (if not specified below, all refer to ℃) for 24 hours, the reaction product was dissolved in chloroform, the solution was washed repeatedly with a mixture of water / methanol (volume ratio of 2 / 1), and finally the chloroform solvent was spin-dried to obtain oligomers.

[0039] Step 2: Under the condition of nitrogen protection, take 3g of oligomer and 0.7g of urea to react at 140°C for 6 hours, wash thoroughly with water or a water-alcohol mixed solvent for 3 to 5 times of purification, and obtain a polyamide resin with self-repairing function Electrode binder (SHP).

[0040] The binder is a bright yellow, t...

Embodiment 2 Embodiment 1

[0041] One of the battery application schemes of the binder obtained in Example 2 Example 1

[0042] Get carbon black (Super-P) and commercial sulfur mix (mass ratio is 2:3), under the protection condition of argon in the sealed reactor, 155 ℃ through the diffusion reaction of molten sulfur for 12 hours, obtain positive electrode active material (CB / S). CB / S and carbon black (conductive agent) were mixed with different binders (SHP, polyvinylidene fluoride (PVDF) and styrene-butadiene rubber-sodium carboxymethyl cellulose (SBR-CMC)) at a ratio of 7:2 The mass ratio of : 1 is mixed evenly, and the positive electrode slurry is prepared, and the positive electrode slurry is evenly coated on the aluminum foil, dried in vacuum at 50 degrees for 24 hours, punched into pieces with a diameter of 15mm as the positive electrode, and metal lithium as the negative electrode, adding 1% LiNO3 lithium bis(trifluoromethylsulfonate)imide (LiTFSI) in 1,3-dioxolane (DOL) / ethylene glycol dimeth...

Embodiment 3 Embodiment 1

[0043] Example 3 The second battery application scheme of the binder obtained in Example 1

[0044]Under the condition of ammonia gas, take graphene oxide powder and react in the quartz tube of tube furnace at 800 degrees for 1 hour to obtain nitrogen-doped graphene (N-G), N-G and commercial sulfur are mixed (mass ratio is 2:3), sealed Under the protection condition of argon in the reaction kettle, the positive electrode active material (N-G / S) was obtained through the diffusion reaction of molten sulfur at 155 degrees for 12 hours. N-G / S, carbon black (conductive agent) and different binders (SHP, PVDF and SBR-CMC) were mixed uniformly at a mass ratio of 7:2:1 to prepare positive electrode slurry, and the positive electrode slurry was evenly coated on On the aluminum foil, vacuum dry at 50 degrees for 24 hours, die into a sheet with a diameter of 15mm as the positive electrode, metal lithium as the negative electrode, add 1% LiNO3 LiTFSI DOL / DME (volume ratio is 1:1) solution...

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Abstract

The invention discloses a binder, and a preparation method and application thereof. In an embodiment, the preparation method comprises the steps of, in a protective atmosphere, fully reacting polyacid with an ethyleneamine monomer, dissolving a reaction product into an organic solvent, carrying out full washing through a mixture of water and methanol and then removing an organic solvent to obtain an oligomer; and in the protective atmosphere, reacting the oligomer with carbomite to obtain the binder. The preparation technology is simple and low in cost and large-scale implementation is facilitated; and the obtained binder is a bright yellow translucent polymer, has the characteristics of glass and rubber, and not only has excellent ductility, but also has self-repairing property. The binder is excellent adaptation with a current collector or an electrode material when used for an electrode, and the structure stability of an electrode slice can be effectively improved, so that the overall electrochemical properties of a battery are greatly improved.

Description

technical field [0001] The invention relates to a binder, in particular to a binder applicable to secondary batteries and a preparation method thereof. Background technique [0002] High energy density, long cycle life, environmental protection, and low cost have become the research hotspots of secondary batteries in recent years. However, many problems are unavoidably encountered in the research process of secondary batteries, among which the electrode powdering and peeling caused by the internal stress generated by the drastic volume change of the electrode greatly affect the electrochemical performance of the battery. A good binder plays a key role in the preparation of electrode materials with excellent electrochemical performance. [0003] The binder is a very important part of the electrode material of the secondary battery, and its performance directly affects the cycle life and cycle performance of the battery. The main function of the battery electrode binder is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCY02E60/10
Inventor 张跃钢南达·山杰李宛飞刘美男侯远周莉莎
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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