A large rate hybrid battery capacitor and its preparation method

A hybrid battery and high-rate technology, which is applied in the manufacture of hybrid/electric double-layer capacitors, hybrid capacitors, hybrid capacitor electrodes, etc., can solve the problem of low charge and discharge capacity, meet high-current charge and discharge, improve rate performance, and increase Effect of Magnification Performance

Active Publication Date: 2019-01-18
NINGBO CRRC NEW ENERGY TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0010] In order to solve the above problems, the present invention discloses a high-rate hybrid battery capacitor and a preparation method thereof. Through the selection and combination of electrode materials, the problem of compatibility between the electrode material and the solvent is effectively improved, and the electrode material is improved to the electrolyte. The problem of low charge and discharge capacity caused by the high sensitivity of the battery has significantly improved the rate performance of the product and met the needs of high current charge and discharge.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0045] Preparation of the positive pole piece: First, the positive active material NCA and LFP were mixed on a ball mill for 4 hours at a mass ratio of 9:1, and then placed in an ultrasonic oscillator (220V, 50Hz) for ultrasonic mixing. The solvent was Water and ethanol, the liquid-solid ratio is controlled to be 8:2, the mixing time is 30 minutes, and then dried in vacuum at 140° C. for 4 hours to obtain the positive electrode composite material.

[0046] Subsequently, the positive electrode active material, activated carbon, conductive agent (SuperP+Ketjen black), and binder (PVDF) were weighed according to the ratio of mass ratio 72:18:5:5, and then dissolved in nitrogen methyl pyrrolidone, using high-speed stirring equipment Stir under vacuum for 4 hours to form a uniform slurry, and stir at a high speed to form a positive electrode slurry. Apply the coating evenly on both sides of the corroded aluminum foil through the coating equipment, and dry it stepwise at a rate of 1...

preparation Embodiment 1

[0067] The preparation method of the high-rate hybrid battery capacitor in this example includes the preparation of the positive electrode sheet and the preparation of the negative electrode sheet. The preparation of the positive electrode sheet includes the preparation of the positive electrode slurry and the pressing of the positive electrode sheet. The positive electrode slurry is prepared by uniformly mixing the positive electrode material and the solvent to obtain the positive electrode. Slurry, the positive electrode sheet is pressed into the positive electrode slurry, and the coating is evenly coated on both sides of the current collector through the coating equipment. The thickness of the positive electrode material formed by the slurry on the current collector is 90 μm on one side (the positive electrode material is on one side. The thickness can also include but not limited to any of the following: 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, ...

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Abstract

The invention discloses a high-rate hybrid battery capacitor and a preparation method thereof. The high-rate hybrid battery capacitor comprises a shell, and an electrolyte and a battery cell arranged in the shell, wherein the battery cell is formed by stacking and assembling a positive plate, a membrane and a negative plate; the positive plate comprises a current collector and a positive material formed on the surface of the current collector, and the positive material comprises a composite material of NCA, LFP and AC; the negative plate comprises a current collector and a negative material formed on the surface of the current collector, and the negative material comprises one or more of AGP, CNT and AC. Through the scheme, the problem that an electrode material is compatible with a solvent is effectively solved, and the problem of low charging and discharging capacity caused by too high sensitivity of the electrode material for the electrolyte is solved, so that the rate performance of the product is obviously improved, and the requirement of large-current charging and discharging is met.

Description

technical field [0001] The invention relates to a battery capacitor and a preparation method thereof, in particular to a large-rate hybrid battery capacitor and a preparation method thereof. [0002] The meaning of following expression among the present invention is: [0003] NCA: LiNi 0.8 C o0.15 al 0.05 o 2 [0004] LFP: LiFePO 4 [0005] AGP: Graphite [0006] CNT: carbon nanotube [0007] AC: activated carbon Background technique [0008] At present, there are mainly lithium-ion batteries and supercapacitors for energy storage. Lithium-ion batteries have the characteristics of high energy density, but their cycle life is short and power density is low. Although supercapacitors have high specific power and cycle life, their energy density is low, so It is urgent to develop a hybrid energy storage device with high power density and high energy density. [0009] Supercapacitor battery is a new type of energy storage device with high energy density and high power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/06H01G11/50H01G11/86H01G11/46H01G11/36H01G11/38H01G11/68
CPCY02E60/13
Inventor 阮殿波吴奕环郑超陈雪丹刘秋香
Owner NINGBO CRRC NEW ENERGY TECH CO LTD
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