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Lithium-ion capacitors based on lithium titanate

A lithium titanate and lithium ion technology, which is applied in the field of lithium ion capacitors, can solve the problems of bad influence on the power performance of lithium ion capacitors, affecting the conductivity value of the electrolyte, etc., so as to improve the capacity utilization rate, maintain high conductivity and improve the cycle. Effects of Features

Active Publication Date: 2018-08-28
中船重工黄冈水中装备动力有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The continuously decreasing electrolyte concentration affects the conductivity value of the electrolyte and may also adversely affect the power performance of Li-ion capacitors

Method used

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  • Lithium-ion capacitors based on lithium titanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The positive electrode material layer is made of 85wt% activated carbon (the specific surface area is 1600m 2 / g) As an active material, 5wt% acetylene black is used as a conductive agent, 10wt% PTFE is used as a binder, and the reversible capacity areal density of the single-sided positive electrode material layer at 2-4V (vs Li) is 4760mAh / m 2 ;

[0037] The negative electrode material layer uses 75wt% lithium titanate as the active material, 10wt% acetylene black as the conductive agent, and 15wt% PVDF as the binder. The single-sided negative electrode material layer has a reversible capacity of 1-2V (vs Li). Surface density is 4760mAh / m 2 ;

[0038] The surface density of the pre-intercalated lithium capacity of the single-sided negative electrode is 2380mAh / m 2 ;

[0039] Both positive and negative current collectors are 20μm corroded aluminum foil;

[0040] The electrolyte is 1.2M LiPF 6 / EC+DMC (the volume ratio of EC to DMC is 1:1).

Embodiment 2

[0042] Positive electrode material layer with 90wt% activated graphene (specific surface area is 3100m 2 / g) as an active material, 5wt% Ketjen black as a conductive agent, 5wt% PTFE as a binder, and the reversible capacity areal density of the single-sided positive electrode material layer at 2-4V (vsLi) is 2020mAh / m 2

[0043] The negative electrode material layer uses 80wt% carbon-coated lithium titanate as the active material (the carbon coating amount is 3.2wt%), 10wt% Ketjen black as the conductive agent, and 10wt% PVDF as the binder, single-sided The reversible capacity areal density of the negative electrode material layer at 1-2V (vsLi) is 8080mAh / m 2 ;

[0044] The surface density of the pre-intercalated lithium capacity of the single-sided negative electrode is 7070mAh / m 2 ;

[0045] The positive current collector is 20μm corroded aluminum foil, and the negative current collector is 18μm copper foil;

[0046] The electrolyte is 1.2M LiBF 4 / AN.

Embodiment 3

[0048] The composition of the positive electrode material layer is 90wt% activated carbon fiber fabric (the specific surface area is 1550m 2 / g) and 10wt% metal aluminum spray coating, the reversible capacity areal density of the single-sided positive electrode material layer at 2-4V (vs Li) is 6216mAh / m 2 ;

[0049] The negative electrode material layer uses 90wt% metallic silver coated lithium titanate as an active material, 6wt% acetylene black as a conductive agent, and 4wt% PVDF as a binder. ) has a reversible capacity areal density of 12432mAh / m 2 ;

[0050] The surface density of the pre-intercalated lithium capacity of the single-sided negative electrode is 6225mAh / m 2 ;

[0051] Corroded aluminum foil with CVD deposited carbon layer with positive and negative current collectors of 20 μm;

[0052] The electrolyte is 1.2M LiClO 4 / EC+EMC (the volume ratio of EC and EMC is 1:2).

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Abstract

The invention discloses a lithium ion capacitor of a lithium titanate system. Active substances in an anode electrode material layer are electric double layer type energy storage carbon materials, and active substances in a cathode electrode material layer are spinel structure lithium titanate; electrolyte comprises a soluble lithium salt and an aprotic organic solvent with the soluble lithium salt dissolved therein; the reversible capacity of the cathode of 1 to 2V is 1 to 4 times that of the reversible capacity of the anode of 2 to 4V; lithium pre-insertion treatment is performed on the cathode lithium titantate, wherein the minimum lithium pre-insertion capacity is the reversible capacity of the anode of 2 to 3V, and the maximum lithium pre-insertion capacity is obtained by subtracting the reversible capacity of the anode of 3 to 4V from the reversible capacity of the cathode of 1 to 2V, so as to improve the capacity utilization ratio of the electric double layer type energy storage carbon materials, and improve the energy density of the lithium ion capacitor of the lithium titanate system; and meanwhile, the circulation characteristic of the lithium titanate cathode is improved, so that the circulation characteristic of the anode carbon material is fully utilized, and the cycle life of the lithium ion capacitor is prolonged.

Description

technical field [0001] The invention relates to the technical field of chemical power sources, in particular to a lithium ion capacitor whose negative electrode active material is a lithium titanate system with a spinel structure. Background technique [0002] Carbon-carbon electrode double-layer supercapacitors have excellent high-current charge-discharge capabilities and long cycle life, but their low energy storage density limits their wide application. Lithium-ion capacitors are composed of electric double-layer energy storage carbon materials, lithium-intercalated energy storage materials and organic lithium salt electrolytes. Combining the energy storage mechanism of electric double-layer supercapacitors and lithium-ion batteries, they can obtain better than electric double-layer The energy density of supercapacitors can maintain the power and long life characteristics of electric double layer supercapacitors to a certain extent. It is a new type of chemical power sour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/06H01G11/32H01G11/46H01G11/50
CPCY02E60/13
Inventor 李文斌刘飞袁斌王兆聪胡棋威
Owner 中船重工黄冈水中装备动力有限公司