Lithium battery tab and preparation method thereof

A lithium battery and tab technology, which is applied in the field of lithium battery tabs and its preparation, can solve the problems of increased battery internal resistance, reduced battery energy density, and decreased battery power performance, achieving cost savings, easy operation, and battery protection Effect

Pending Publication Date: 2019-06-14
福建冠城瑞闽新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The safety is improved by adding flame retardant additives to the electrolyte, but the conductivity of the electrolyte decreases, and the battery cycle and charge-discharge performance decreases; the ceramic layer is coated with a diaphragm, and the improvement of the melting point is very limited, generally not exceeding 160°C; heat-sensitive materials The mixture coating is applied between the electrode material and the current collector, which has a certain effect on controlling the thermal runaway inside the battery, but reduces the energy density of the battery and reduces the rate performance of the battery
[0005] In the prior art, PVDF is directly made into a diaphragm or a pole piece, which will directly affect the energy density of the battery; both will lead to an increase in the internal resistance of the battery, resulting in a decrease in the power performance of the battery

Method used

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  • Lithium battery tab and preparation method thereof
  • Lithium battery tab and preparation method thereof
  • Lithium battery tab and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: as Figure 1-2 As shown, a lithium battery tab is coated with a PVDF coating 1 on the surface of the tab itself. The thickness of the PVDF coating 1 is 1 micron, and the PVDF coating 1 is made of PVDF, CNT, graphene, and NMP materials. ,

[0052] Wherein, the ratio by weight: PVDF, graphene, and CNT are 50%:10%:10% by weight. The addition of NMP is 14.5 times of PVDF weight;

[0053] The preparation method of the above-mentioned lithium battery tab is the following steps:

[0054] S1: Mix graphene, CNT, NMP and PVDF to make slurry;

[0055] The steps of making slurry are:

[0056] 1. PVDF baking: Baking PVDF for 10 hours at 75°C and vacuum less than -0.095Mpa.

[0057] 2. PVDF and NMP are made into glue: PVDF is baked and mixed with NMP, and PVDF glue is made after three times of stirring;

[0058] Mix three times using a blender for:

[0059] Stirring for the first time: NMP is 14 times the weight of PVDF, add baked PVDF to NMP, and stir for the fi...

Embodiment 2

[0073] Embodiment 2: as Figure 1-2 As shown, a lithium battery tab is coated with a PVDF coating 1 on the surface of the tab itself. The thickness of the PVDF coating 1 is 10 microns, and the PVDF coating 1 is made of PVDF, CNT, graphene, and NMP materials. ,

[0074] Wherein, the ratio by weight: PVDF, graphene, and CNT is 90%:25%:25% by weight. The addition amount of NMP is 23 times of PVDF weight.

[0075] The preparation method of the above-mentioned lithium battery tab is the following steps:

[0076] S1: Mix graphene, CNT, NMP and PVDF to make slurry;

[0077] The steps of making slurry are:

[0078] 1. PVDF baking: Baking PVDF for 13 hours at 85°C and vacuum less than -0.095Mpa.

[0079] 2. PVDF and NMP are made into glue: PVDF is baked and mixed with NMP, and PVDF glue is made after three times of stirring;

[0080] Mix three times using a blender for:

[0081] Stirring for the first time: NMP is 18 times the weight of PVDF, add baked PVDF to NMP, and stir for ...

Embodiment 3

[0095] Embodiment 3: as Figure 1-2 As shown, a lithium battery tab is coated with a PVDF coating 1 on the surface of the tab itself. The thickness of the PVDF coating 1 is 5 microns, and the PVDF coating 1 is made of PVDF, CNT, graphene, and NMP materials. ,

[0096] Wherein, the ratio by weight: PVDF, graphene, and CNT is 80%:18%:20% by weight. The addition amount of NMP is 19 times of PVDF weight.

[0097] The preparation method of the above-mentioned lithium battery tab is the following steps:

[0098] S1: Mix graphene, CNT, NMP and PVDF to make slurry;

[0099] The steps of making slurry are:

[0100] 1. PVDF baking: Baking PVDF for 12 hours at 80°C and vacuum less than -0.095Mpa.

[0101] 2. PVDF and NMP are made into glue: PVDF is baked and mixed with NMP, and PVDF glue is made after three times of stirring;

[0102] Mix three times using a blender for:

[0103] Stirring for the first time: NMP is 16 times the weight of PVDF, add baked PVDF to NMP, and stir for 1...

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Abstract

The invention relates to lithium battery tabs, in particular to a lithium battery tab and a preparation method thereof. The lithium battery tab comprises a tab body and a PVDF coating applied to the surface of the tab body. The thickness of the PVDF coating is 1-10 microns. The preparation method comprises the steps of S1, mixing a conductive substance, a solvent and PVDF to prepare slurry; S2, uniformly spraying the obtained slurry on the surface of the tab body; and S3, drying the sprayed tab body at 100-150 DEG C to obtain the tab. A PVDF material serves as the PVDF coating to be applied tothe tab body for the first time; the control on the sharp rise of the temperature during battery charging and discharging is more direct; when the temperature reaches a dangerous temperature, the current can be effectively cut off to protect the battery; and on the basis that the safety of the battery can be improved, the energy density and the rate performance of the battery are not influenced.

Description

technical field [0001] The invention relates to a lithium battery tab, in particular to a lithium battery tab and a preparation method thereof. Background technique [0002] Due to its large specific capacity, high working voltage, fast charging and discharging speed, long cycle life, wide working temperature range, high energy density, clean and environmentally friendly, lithium-ion batteries are not only used in portable electronic devices such as mobile power supplies, digital cameras and portable electronics. It is widely used on computers, and it is more and more widely used on large and medium-sized equipment such as electric bicycles and electric vehicles. [0003] With the maturity and improvement of electric vehicle technology, electric vehicles and hybrid vehicles have gradually entered people's daily life. Subsequently, people's requirements for lithium-ion batteries are getting higher and higher, especially the requirements for safety. The interior of the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M2/34H01M10/0525
CPCY02E60/10
Inventor 吕娟杨允杰赵家兴张玉玺
Owner 福建冠城瑞闽新能源科技有限公司
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