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A kind of electrolyte additive with catalytic decomposition of lithium-replenishing agent and application thereof

An electrolyte additive and electrolyte technology, applied in the direction of electrolytes, circuits, electrical components, etc., can solve the problems of accelerating the side reaction between the electrolyte and the positive electrode material, reducing the electrolyte oxidative decomposition, etc., to improve cycle stability and reduce decomposition voltage, the effect of promoting decomposition

Active Publication Date: 2022-08-02
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common cathode lithium supplements such as Li 2 o 2 , Li 3 N. Li 2 C 4 o 4 , Li 2 C 2 o 4 , Li 2 C 3 o 5 and Li 2 C 4 o 6 The decomposition potential of the battery is relatively high (4.2-4.6V). It is necessary to charge the voltage to a higher potential during the first cycle of charging to release its capacity and exert the effect of lithium supplementation. However, at such a high voltage, it is inevitable that the positive electrode The material brings disadvantages, especially the acceleration of the side reaction between the electrolyte and the positive electrode material, the oxidative decomposition of the reducing electrolyte, and the dissolution of the transition metal of the positive electrode material.

Method used

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  • A kind of electrolyte additive with catalytic decomposition of lithium-replenishing agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The present embodiment provides a novel electrolyte, and its preparation method includes the following steps:

[0023] S1, the EC and DMC treated by distillation, dehydration and purification are uniformly mixed according to a volume ratio of 1:1 to form an organic solvent.

[0024] S2, the fully dried lithium salt LiPF 6 Dissolved in the organic solvent of step S1, the concentration of lithium salt is 1moL / L.

[0025] S3, adding electrolyte additives to the lithium salt solution, including 18-crown (ether)-6, 2wt% ethylene glycol dimethyl ether DME, 5wt% triazole and 5wt% accounting for 1wt% of the total electrolyte mass chlorobenzene, and mix well.

[0026] This embodiment also provides a lithium ion battery, including a negative electrode piece, a positive electrode piece containing a lithium supplement, a separator, and the novel electrolyte prepared in this example.

[0027] Wherein, the preparation method of the negative electrode pole piece includes the follow...

Embodiment 2

[0031] The present embodiment provides a novel electrolyte, and its preparation method includes the following steps:

[0032] S1, the EC and DMC treated by distillation, dehydration and purification are uniformly mixed according to a volume ratio of 1:1 to form an organic solvent.

[0033] S2, the fully dried lithium salt LiDFOB is dissolved in the organic solvent of step S1, and the concentration of the lithium salt is 1 moL / L to obtain a lithium salt solution.

[0034] S3, adding electrolyte additives to the lithium salt solution, including 18-crown (ether)-6, 3wt% of diethylene glycol dimethyl ether DEGDME, 5wt% of triazole and 2wt% of the total mass of the electrolyte % chlorobenzene, mix well.

[0035] This embodiment also provides a lithium-ion battery, the preparation method of which is basically the same as that in Embodiment 1, the only difference is that the positive electrode active material is replaced with LiFePO 4 , the content of the lithium supplement is adju...

Embodiment 3

[0037] The present embodiment provides a novel electrolyte, and its preparation method includes the following steps:

[0038] S1, the EC and DMC treated by distillation, dehydration and purification are uniformly mixed according to a volume ratio of 1:1 to form an organic solvent.

[0039] S2, the fully dried lithium salt LiPF 6 Dissolving in the organic solvent of step S1, the concentration of lithium salt is 1.5moL / L, to obtain a lithium salt solution.

[0040] S3, adding electrolyte additives to the lithium salt solution, including 15-crown (ether)-5, 4wt% ethylene glycol dimethyl ether DME, 4wt% triazole and 5wt% accounting for 1wt% of the total electrolyte mass chlorobenzene, and mix well.

[0041] The present embodiment also provides a lithium ion battery, the preparation method of which is basically the same as that of Embodiment 1, the only difference is that the lithium supplement is replaced with lithium phosphate, and the content is adjusted to 5wt%.

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Abstract

The invention provides an electrolyte solution additive with catalytic decomposition of lithium-replenishing agent and application thereof. The electrolyte additive with catalytic decomposition of lithium-replenishing agent includes crown ether, linear ether, nitrogen-containing multidentate complex and fluorobenzene. In a battery system containing a lithium supplement, the decomposition of the lithium supplement can be promoted, the decomposition voltage of the lithium supplement can be reduced, and the cycle stability of the battery can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution additive with catalytic decomposition of a lithium replenishing agent and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, and long cycle life, and are widely used in digital, electric vehicles, power tools and other fields. However, there is a loss of active lithium in lithium-ion batteries, and lithium supplementation is required. [0003] At present, lithium supplementation technology mainly includes positive electrode lithium supplementation and negative electrode lithium supplementation. The positive electrode lithium supplementation does not require additional process improvement, the cost is low, and the safety is good. However, common cathode lithium supplements such as Li 2 O 2 , Li 3 N, Li 2 C 4 O 4 , Li 2 C 2 O 4 , Li 2 C 3 O 5 and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525H01M2300/0091Y02E60/10
Inventor 谢佳曾子琪覃明盛
Owner HUAZHONG UNIV OF SCI & TECH
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