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Lithium ion capacitor

A capacitor and lithium ion technology, applied in the field of lithium ion capacitors, can solve the problems of not paying attention to the influence of the power characteristics of lithium ion capacitors, unable to ensure the high conductivity characteristics of the electrolyte, restricting the power characteristics of lithium ion capacitors, etc., to achieve high energy utilization Efficiency, suppressing the decay of cycle life, improving the effect of energy storage density

Active Publication Date: 2016-11-23
中船重工黄冈水中装备动力有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology does not pay attention to the influence of electrolyte concentration changes on the power characteristics of lithium-ion capacitors during charging and discharging. Most of them use electrolytes with a concentration of about 1mol / L consistent with lithium-ion batteries.
Even in a small number of technologies, realizing the problem of electrolyte concentration reduction during the charging process of lithium-ion capacitors, a higher concentration of electrolyte is used (such as the use of 1.2mol / L in the document "Electrochimica Acta 153 (2015) 476-483") LiPF 6 Electrolyte, while the literature "Journal of Power Sources 113 (2003) 62-71" uses 2.0mol / L LiBF 4 Electrolyte), but it is still impossible to give a suitable technical solution for the utilization of electrolyte concentration according to the characteristics of the electrolyte system, and cannot guarantee the high conductivity of the electrolyte, which restricts the performance of the power characteristics of lithium-ion capacitors, and also limits lithium-ion capacitors to a certain extent. Cyclic characteristics and stored energy of ionic capacitors

Method used

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  • Lithium ion capacitor

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Embodiment 1

[0035] The positive electrode material layer is 82wt% activated carbon (the specific surface area is 1600m 2 / g) as positive electrode active material, 10wt% acetylene black as conductive agent, 8wt% PTFE as binding agent;

[0036] The negative electrode material layer uses 92wt% mesophase carbon microspheres (pre-intercalated lithium capacity of 250mAh / g) as the negative active material, 3wt% Ketjen black as the conductive agent, 2.5wt% SBR and 2.5wt% CMC as a binder;

[0037] The lithium salt in the electrolyte is LiPF 6 , the solvent is EC and EMC (the volume ratio of the two is 1:1), and the maximum conductivity concentration of the electrolyte in this system is 0.75mol / L at 30°C;

[0038] Lithium-ion capacitors work at 2.0V-3.8V, the concentration of the electrolyte is 1.0mol / L at 2.0V, and 0.75mol / L at 3.8V.

Embodiment 2

[0040] Positive electrode material layer with 5wt% activated graphene (specific surface area is 3100m 2 / g) and 80wt% activated carbon (the specific surface area is 1400m 2 / g) as positive electrode active material, the acetylene black of 5wt% is as conductive agent, and the PTFE of 10wt% is as binding agent;

[0041] The negative electrode material layer uses 87wt% artificial graphite (pre-intercalated lithium capacity is 100mAh / g) as the negative electrode active material, 6wt% acetylene black as the conductive agent, and 7wt% PVDF as the binder;

[0042] The lithium salt in the electrolyte is Li(CF 3 BF 3 ), the solvent is EC, EMC and DMC (the volume ratio of the three is 5:3:2), and the maximum conductivity concentration of the electrolyte in this system is 1mol / L at 25°C;

[0043] Lithium-ion capacitors work at 2.0V-4.0V, the concentration of the electrolyte is 1.1mol / L at 2.0V, and 0.8mol / L at 4.0V.

Embodiment 3

[0045] The positive electrode material layer is carbon aerogel activated by 84wt% carbon dioxide (the specific surface area is 1886m 2 / g) as positive electrode active material, 4wt% acetylene black and 2wt% conductive graphite as conductive agent, 10wt% PTFE as binding agent;

[0046] The negative electrode material layer uses 80wt% carbon-coated lithium titanate (the carbon coating amount is 3.25%) as the negative electrode active material, 10wt% Ketjen black as the conductive agent, and 10wt% PVDF as the binding agent;

[0047] The lithium salt in the electrolyte is LiPF 6 , the solvent is PC, and the maximum conductivity concentration of the electrolyte in this system is 0.8mol / L at 25°C;

[0048] Lithium-ion capacitors work at 1.5V-2.7V, the concentration of the electrolyte is 1.0mol / L at 1.5V, and 0.7mol / L at 2.7V.

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Abstract

The invention discloses a lithium ion capacitor. An active material in a positive electrode material layer is a double-layer energy storage carbon material, an active material in a negative electrode material is a lithium inserted energy storage material, and electrolyte comprises soluble lithium salt and non-protonic organic solvent with soluble lithium salt dissolved. The concentration of the electrolyte is x when an open-circuit voltage of the lithium ion capacitor is equal to a maximum working voltage and is y when the open-circuit voltage is equal to a minimum working voltage, and a maximum conductivity concentration value of electrolytes of a same system is z at a temperature ranging from -20 DEG C to 60 DEG C, wherein z is larger than or equal to x and smaller than or equal to y. When the lithium ion capacitor is in operation under a voltage between the minimum working voltage and the maximum working voltage, concentration variation of the electrolyte corresponds to a high concentration range of conductivity values, the highest ionic conductivity range of the electrolyte is used to the greatest extent, and accordingly the lithium ion capacitor is low in internal resistance and excellent in power performance.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a lithium ion capacitor. Background technique [0002] Lithium ion capacitor is a new type of chemical power source, which is composed of electric double layer energy storage carbon material, lithium intercalation energy storage material and organic lithium salt electrolyte. Lithium-ion capacitors combine the energy storage mechanism of electric double-layer supercapacitors and lithium-ion batteries, and have the electrochemical characteristics of supercapacitors and lithium-ion batteries. Excellent power and cycle characteristics of ion batteries. In addition, lithium-ion capacitors also have many advantages such as low self-discharge rate, high operating voltage, wide operating temperature range, and high safety. Application prospect. [0003] The construction methods of lithium-ion capacitors are mainly divided into the following two categories: the first cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/50H01G11/32H01G11/58H01G11/60H01G11/62
CPCY02E60/13H01G11/50H01G11/32H01G11/58H01G11/60H01G11/62
Inventor 李文斌刘飞袁斌金鑫孙佳
Owner 中船重工黄冈水中装备动力有限公司
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