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Pole core for lithium ion battery and lithium ion battery using pole core

A lithium-ion battery, pole core technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor bonding force and poor electrolyte wettability, increase volume energy density, and improve ion passage. Efficiency and effect of improving safety performance

Inactive Publication Date: 2010-09-08
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the defects of poor bonding force between the inorganic protective film and the electrode and poor wettability of the electrolyte in the prior art, the present invention provides a lithium-ion battery core, which includes a positive pole piece, a negative pole piece and a positive pole piece and the separator between the negative electrode sheet, which is characterized in that an adhesive layer is arranged between the positive electrode sheet and the negative electrode sheet and the separator, so that the positive electrode sheet and the negative electrode sheet and the separator are closely bonded, the adhesive layer has a porous structure, and The porosity of the adhesive layer is 35%-80%, and the composition of the adhesive layer is fluororesin containing siloxane

Method used

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  • Pole core for lithium ion battery and lithium ion battery using pole core
  • Pole core for lithium ion battery and lithium ion battery using pole core
  • Pole core for lithium ion battery and lithium ion battery using pole core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example is used to illustrate the battery electrode provided by the present invention, the lithium ion battery using the electrode and their preparation method.

[0037] 1) Preparation of positive electrode

[0038] a: The positive electrode slurry is prepared as follows: 10 grams of polyvinylidene fluoride (Atofina Company) is dissolved in 225 grams of N-methyl-2-pyrrolidone (NMP) solvent to prepare a binder solution, and 15 grams of carbon black (TIMICAL company) was dispersed into the above-mentioned binder solution, and then 500 grams of lithium cobalt oxide was added to the resulting solution, and mixed well to obtain positive electrode active material slurry X1.

[0039] b: The adhesive layer slurry was prepared by the following method: 8 grams of polyvinylidene fluoride (Atofina Company) was dissolved in 42 grams of ethyl orthosilicate (Beijing Yili Fine Chemicals Co., Ltd.); After the solution was clarified, 500 g of N-methyl-2-pyrrolidone (NMP) solvent wa...

Embodiment 2

[0047] Lithium-ion batteries are prepared according to the method of Example 1, the difference is that the binder layer slurry is prepared by the following method: 10 grams of polyvinylidene fluoride (Atofina Company) is dissolved in 40 grams of tetraethyl orthosilicate (Beijing Yili Fine Chemicals Co., Ltd.), after the solution is clarified, add 500 grams of N-methyl-2-pyrrolidone (NMP) solvent, mix at a speed of 500rpm, and the mixing time is 45 minutes to obtain a homogeneous mixture containing Silicone adhesive paste X3.

[0048] Coat X3 with the surface of the positive and negative electrode materials, form an adhesive layer after curing, and wind the positive and negative electrode sheets covered with the adhesive layer together with the separator to make a pole core, and then follow the procedure in Example 1 Method assembly, obtain lithium ion battery A2.

Embodiment 3

[0050] Lithium-ion batteries are prepared according to the method of Example 1, the difference is that the binder layer slurry is prepared by the following method: 7 grams of polyvinylidene fluoride (Atofina Company) are dissolved in 43 grams of tetraethyl orthosilicate (Beijing Yili Fine Chemicals Co., Ltd.), after the solution is clarified, add 500 grams of N-methyl-2-pyrrolidone (NMP) solvent, mix at a speed of 500rpm, and the mixing time is 45 minutes to obtain a homogeneous mixture containing Silicone adhesive paste X4.

[0051] Coat X4 with the surface of the positive and negative electrode materials, form an adhesive layer after curing, and wind the positive and negative electrode sheets covered with the adhesive layer together with the diaphragm to make a pole core, and then follow the procedure in Example 1 Method assembly, obtain lithium ion battery A3.

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Abstract

The invention relates to a pole core for a lithium ion battery and the lithium ion battery using the pole core, wherein the pole core comprises an anode piece, a cathode piece and a membrane between the anode piece and the cathode piece, and is characterized in that a bond layer is respectively arranged between the anode piece and the membrane and between the cathode piece and the membrane, so that the anode piece and the cathode piece as well as the membrane are closely bonded, the bond layer is provided with a porous structure, the porosity of the bond layer is 35 to 80 percent, the component of the bond layer is fluorine resin containing siloxane, and the battery obtained by using the pole core for the lithium ion battery has good safety performance and simultaneously keeps the excellent conventional performance of the battery.

Description

【Technical field】 [0001] The invention relates to a pole core for a battery and a battery using the pole core. 【Background technique】 [0002] Lithium-ion batteries have many advantages such as high working voltage, high specific capacity, long cycle life, small self-discharge, no memory effect, and no pollution to the environment. They are widely used in electronic products. However, the current lithium-ion secondary batteries There are safety problems in use, and lithium-ion batteries of laptops and mobile phones often catch fire. One of the main reasons is that the positive and negative electrodes of existing lithium-ion batteries rely on very thin PE (polyethylene) or PP (polypropylene) materials. As an isolation layer, under abnormal use conditions, the burrs on the surface of the positive and negative electrodes and the metal shavings introduced during the production process can easily pierce this very thin isolation layer and cause an internal short circuit in the bat...

Claims

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Application Information

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IPC IPC(8): H01M10/38C09J127/12C09J127/14C09J127/16C09J127/18C09J127/20H01M10/36H01M10/40
CPCY02E60/10Y02P70/50
Inventor 朱江民
Owner SHANGHAI BYD
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