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A polymer binder with high peel strength and its application in secondary lithium batteries

A polymer, high-stripping technology, used in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of mechanical properties (poor elastic modulus, low solubility of organic solvents, electrode delamination or peeling, etc.), and achieve excellent performance. , The effect of easy availability of raw materials and high elastic modulus

Active Publication Date: 2022-06-21
中科深蓝汇泽新能源(青岛)有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are obvious defects in PVDF binder: (1) only through the van der Waals force to bond the electrode active material and the current collector, the bonding performance is insufficient, and the electrode delamination or peeling phenomenon is prone to occur during the cycle; (2) the lithium ion Low electrical conductivity and poor electrical conductivity, it is easy to cause battery polarization when charging and discharging at a large rate; (3) The mechanical properties (elastic modulus) are poor, which cannot meet the needs of negative electrode active materials such as nano-silicon that have a large volume change during charging and discharging. The requirements of the material for the binder; (4) easy to decompose under high voltage and lose the bonding performance
However, most polysaccharide binders have performance defects such as low peel strength with current collectors, and the structure optimization faces difficulties such as low solubility in organic solvents.

Method used

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  • A polymer binder with high peel strength and its application in secondary lithium batteries
  • A polymer binder with high peel strength and its application in secondary lithium batteries
  • A polymer binder with high peel strength and its application in secondary lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Polymer Binder A1:

[0043] The cathode active material lithium nickel manganate, Super P and binder A1 precursor [(Nu1 (m=44, 60% of the total polymer mass) and polyvinyl carbonate (40% of the total polymer mass)] were added to the mortar at a mass ratio of 8:1:1 as a slurry, added NMP (accounting for 10% of the mass of the slurry) continued to grind and stir at 30° C. for 20 min to obtain a uniform slurry. The above slurry was evenly coated on aluminum foil, dried in an oven at 60°C for 2 hours, shot into a suitable size pole piece by a gun slicer, continued to dry in an oven at 100°C for 24 hours, and placed in a glove box for use.

[0044] The electrode obtained above is used as the positive electrode, and the graphite is assembled as the negative electrode to obtain a lithium nickel manganate / / graphite full battery, and its room temperature long cycle performance and peel strength at 0.5C are detected (see figure 1 and Table 1), by figure 1 It ca...

Embodiment 2

[0050] Preparation of Polymer Binder A2:

[0051] Put Nu2 (10% of the total polymer mass) and polyethylene carbonate (90% of the total polymer mass) were dissolved in acetonitrile (80% of the mass of the slurry), and the reaction was stirred at 100 ° C for 2 h to prepare A solution of polymer binder A2 was obtained.

[0052] High peel strength polymer binder based electrodes:

[0053] The positive electrode active materials sulfur, graphite and the acetonitrile solution of the polymer binder A2 obtained above were ground and stirred in a mortar in a mass ratio of 70:5:25 to form a uniform slurry. The above slurry was evenly coated on aluminum foil and dried in an oven at 60°C for 0.5h. The pole pieces of the appropriate size are formed by the gun tablet machine, and then continue to be dried in an 80 ℃ oven for 12 hours.

[0054] The above-obtained electrode was used as the positive electrode, and lithium was used as the negative electrode to assemble, and the sulfur / / lit...

Embodiment 3

[0059] Preparation of Polymer Binder A3:

[0060] structure Nu3 as (33% of the total polymer mass) and poly(vinylidene carbonate) (67% of the total polymer mass) were dissolved in tetrahydrofuran (80% by mass of the slurry), and the reaction was stirred at -10°C A solution of polymer binder A2 was prepared in 2 min. High peel strength polymer binder based electrodes:

[0061] The ternary positive electrode material, acetylene black and the tetrahydrofuran solution of the polymer binder A3 obtained above were ground and stirred in a mortar in a mass ratio of 6.5:1.8:1.7 to form a uniform slurry. The above slurry was uniformly coated on aluminum foil and dried in an oven at 60°C for 20 min. Pole pieces of suitable size are shot by a shotgun machine, continue to be dried in a 60 ℃ vacuum oven for 12 hours, and placed in a glove box for future use.

[0062] The above-obtained electrode was used as the positive electrode, and lithium was used as the negative electrode to assem...

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Abstract

The invention relates to the field of secondary lithium batteries, in particular to a polymer binder with high peel strength and its application in secondary lithium batteries. The polymer binder is obtained by the ring-opening reaction of nucleophiles to polyvinylene carbonate; among them, polyvinylene carbonate accounts for 10-90% of the total mass of the polymer binder; the nucleophile accounts for the polymer bond 10‑90% of the total mass of the agent. The polymer binder of the present invention is prepared by the ring-opening reaction of polyvinylene carbonate by a nucleophile, has high peel strength (0.02-0.6N / mm) and higher decomposition voltage (4.5-6.0V), and can Used as an electrode material binder for secondary lithium batteries.

Description

technical field [0001] The invention relates to the field of secondary lithium batteries, in particular to a polymer binder with high peel strength and its application in secondary lithium batteries. Background technique [0002] Secondary lithium-ion batteries have a series of outstanding advantages such as high specific energy, high operating voltage, light weight, small self-discharge, long cycle life, stable discharge, no memory effect, and low environmental pollution. Notebook computers and other new portable communication and electronic products. In the process of preparing lithium-ion batteries, the positive and negative electrode slurries are uniformly coated on the corresponding current collectors, and after drying, they are formed by rolling, tableting, and winding. Among them, the binder is an inactive component in the electrode sheet of the lithium secondary battery. Its main function is to bind the electrode active material and enhance the electronic contact be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/052H01M4/04H01M4/13H01M4/139
CPCH01M4/622H01M10/052H01M4/13H01M4/139H01M4/0404H01M4/0409H01M10/0525
Inventor 崔光磊张焕瑞王鹏徐红霞胡容祥
Owner 中科深蓝汇泽新能源(青岛)有限责任公司
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