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Application of additive capable of removing active oxygen species in lithium ion battery

A technology of lithium-ion batteries and additives, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of poor battery cycle performance and rate performance, reduce electrolyte oxidation, achieve high-rate charge and discharge performance, and avoid battery damage. The effect of overcharging

Pending Publication Date: 2022-08-02
广东马车动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an application of an additive that can scavenge active oxygen species in lithium-ion batteries, aiming to solve the problem of battery life caused by the generation of active oxygen species in existing lithium batteries during cycling. Problems with poor cycle performance and rate performance

Method used

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  • Application of additive capable of removing active oxygen species in lithium ion battery
  • Application of additive capable of removing active oxygen species in lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0018] (1) Preparation of positive electrode sheet

[0019] The cathode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2 , Adhesive polyvinylidene fluoride, conductive agent acetylene black are prepared according to the mass ratio of 97:1.5:1.5, first add polyvinylidene fluoride to a certain amount of N-methylpyrrolidone to dissolve, and then add LiNi 0.8 Co 0.1 Mn 0.1 O 2 The powder and acetylene black are stirred and mixed under the action of vacuum stirring to form a positive electrode slurry with uniform fluidity. The positive electrode slurry is uniformly coated on the aluminum foil current collector with a thickness of 12 μm, and is dried in an oven with five different temperature gradients. After baking, it was placed in a vacuum oven at 120° C. for 8 hours, and after rolling and slitting, a positive electrode sheet for assembling a lithium ion battery was obtained. Using NaVPO in a similar way 4 F was used as a positive electrode active material to obtain a positive ...

Embodiment 2

[0029] (1) Preparation of positive electrode sheet

[0030] The cathode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2 , Adhesive polyvinylidene fluoride, conductive agent acetylene black are prepared according to the mass ratio of 97:1.5:1.5, first add polyvinylidene fluoride to a certain amount of N-methylpyrrolidone to dissolve, and then add LiNi 0.8 Co 0.1 Mn 0.1 O 2 The powder and acetylene black are stirred and mixed under the action of vacuum stirring to form a positive electrode slurry with uniform fluidity. The positive electrode slurry is uniformly coated on the aluminum foil current collector with a thickness of 12 μm, and is dried in an oven with five different temperature gradients. After baking, it was placed in a vacuum oven at 120° C. for 8 hours, and after rolling and slitting, a positive electrode sheet for assembling a lithium ion battery was obtained. Using NaVPO in a similar way 4 F was used as a positive electrode active material to obtain a positive ...

Embodiment 3

[0040] (1) Preparation of positive electrode sheet

[0041] The cathode active material LiNi 0.8 Co 0.1 Mn 0.1 O 2 , Adhesive polyvinylidene fluoride, conductive agent acetylene black are prepared according to the mass ratio of 97:1.5:1.5, first add polyvinylidene fluoride to a certain amount of N-methylpyrrolidone to dissolve, and then add LiNi 0.8 Co 0.1 Mn 0.1 O 2 The powder and acetylene black are stirred and mixed under the action of vacuum stirring to form a positive electrode slurry with uniform fluidity. The positive electrode slurry is uniformly coated on the aluminum foil current collector with a thickness of 12 μm, and is dried in an oven with five different temperature gradients. After baking, it was placed in a vacuum oven at 120° C. for 8 hours, and after rolling and slitting, a positive electrode sheet for assembling a lithium ion battery was obtained. Using NaVPO in a similar way 4 F was used as a positive electrode active material to obtain a positive ...

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Abstract

The invention discloses an application of an additive capable of removing active oxygen species in a lithium ion battery, the additive is added into an electrolyte in the lithium ion battery, and the additive is an organic matter containing bitriene, an anthryl structure unit, a tertiary aromatic amino group, a nitrogen-containing heterocyclic ring or a selenium-containing active functional group. According to the invention, the additive is added into the electrolyte, so that the active functional group contained in the additive can be subjected to cycloaddition reaction with active oxygen species generated in the battery, thereby obviously reducing electrolyte oxidation caused by the active oxygen species, and being beneficial to constructing a thin positive electrode / electrolyte interface layer with high ion transport property; the high-rate charge-discharge performance of the battery can be realized; in addition, the additive can also obviously improve the self-discharge of the battery and avoid the overcharge of the battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to the application of an additive capable of scavenging active oxygen species in lithium ion batteries. Background technique [0002] During the cycling process of the oxide cathode lithium battery, the active material is prone to phase transition to generate a variety of active oxygen species such as singlet oxygen and superoxide radicals; secondly, the lithium carbonate generated on the surface of the oxide cathode also occurs under high voltage. Decompose, producing a large amount of reactive oxygen species. These reactive oxygen species can induce severe oxidative decomposition of the electrolyte, resulting in a large number of harmful by-products that corrode and destroy the active material structure on the one hand, and deposit on the surface of the positive electrode to form a thick positive electrode / electrolyte interface that is prone to ion blockage . These fac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 陈超李真棠
Owner 广东马车动力科技有限公司
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