A preparation method of a lithium-ion battery with improved high-voltage low-temperature discharge and cycle performance

A lithium-ion battery, cycle performance technology, applied in battery electrodes, secondary batteries, electrode manufacturing, etc., can solve the problems of low-temperature discharge performance and poor cycle performance, and achieve improved low-temperature discharge performance, low impedance, and reduced compaction density. Effect

Active Publication Date: 2021-07-02
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor low-temperature discharge performance and cycle performance of high-voltage lithium-ion batteries, provide a preparation method for lithium-ion batteries that improve high-voltage low-temperature discharge and cycle performance, and the low-temperature discharge performance of the prepared lithium-ion batteries And the cycle performance is better, the high voltage refers to ≥4.45V, and the low temperature refers to ≤0℃

Method used

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  • A preparation method of a lithium-ion battery with improved high-voltage low-temperature discharge and cycle performance

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specific Embodiment approach 1

[0011] DETAILED DESCRIPTION OF THE INVENTION A method of preparing a lithium ion battery increasing high voltage low temperature discharge and cycle performance, the preparation method steps are as follows:

[0012] Step 1: A negative electrode slurry A having a thickness of 170 um to 240 um is applied to the negative electrode collector length, the negative slurry A, from the negative electrode main material, high ratio surface area (180 ~ 800m) 2 / g) Conductant, CMC, SBR, modified acrylic adhesive according to 96.1% ~ 97.3%: 0.5% ~ 1.0%: 0.96% ~ 1.5%: 0.3% ~ 1.19%: 0.3% ~ 1.19% mass composition composition ;

[0013] Step 2: Apply a negative slurry B having a layer of thickness of 170 um to 240 um on the negative electrode concentration fluid, from the negative electrode main material, low specific surface area (30 ~ 100m) 2 / g) Conductant, CMC, SBR consists of 96.1% to 97.3%: 0.5% to 1.0%: 1.2% ~ 1.5%: 1.0% ~ 1.4% mass percentage;

[0014] Step 3: Roller Pressure → Subthere. ...

specific Embodiment approach 2

[0016] DETAILED DESCRIPTION OF THE INVENTION A method of preparing a lithium ion battery increasing high voltage low temperature discharge and cycle performance, in step one, the specific method of formula A is: (1) 20 % ~ 50% of CMC and high-proportional area conductive agents are premixed in advance; (2) Add 20% to 30% negative electrode main material and 30% to 40% of CMC; (3) Add 25% to 30% negative electrode Materials and 10% to 50% of CMC; (4) Add 25% to 30% negative electrode main materials and modified acrylic binders; (5) add 10% to 30% negative electrode main material; (6) final One step will join the SBR.

specific Embodiment approach 3

[0017] DETAILED DESCRIPTION OF THE INVENTION 3: A method for improving a lithium ion battery having a high voltage low temperature discharge and cycle performance, in step two, the negative slurry B specifically formulated method: (1) 10 % ~ 30% CMC and low-specific surface area conductive agent advance mixed; (2) Add 20% to 30% negative electrode main material and 40% to 50% of CMC; (3) add 25% to 30% negative electrode Materials and 20% to 50% of CMC; (4) Add 25% to 30% negative electrode main materials; (5) add 10% to 30% negative electrode main material; (6) the last step adds SBR to all.

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Abstract

The invention discloses a preparation method of a lithium-ion battery that improves high-voltage low-temperature discharge and cycle performance, and belongs to the technical field of lithium-ion batteries. The preparation method is as follows: a layer of negative electrode slurry A with a thickness of 170um~240um is coated on the paste surface of the negative electrode current collector, and the negative electrode slurry A is composed of negative electrode main material, high specific surface area conductive agent, CMC , SBR, and modified acrylic binder; a layer of negative electrode slurry B with a thickness of 170um~240um is coated on the short pasted surface of the negative electrode current collector, and the negative electrode slurry B is composed of negative electrode main material, low specific surface area Composed of conductive agent, CMC and SBR; rolling → sorting. The present invention uses two coating processes to coat different types of slurries on both sides of the negative electrode current collector to improve the bonding performance of the negative electrode active material and the current collector and the liquid absorption performance of the negative electrode sheet, especially improving the long-term coating The polarization effect between the paste surface and the negative electrode current collector improves the low-temperature discharge and cycle performance of the high-voltage battery.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion batteries, and in particular, the present invention relates to a method of improving a lithium ion battery for high voltage low temperature discharge and cycle performance. Background technique [0002] The high-voltage lithium-ion battery has a capacity attenuation during the charge and discharge cycle, the cycle life is short, the thickness expansion is large, and the lithium-lithium thickness is insufficient, because the polarization effect and local current of the high voltage lithium ion battery during charging The distribution is uneven, which is easy to exceed, so that the negative electrode plate is particularly prone to lithium lithium, deteriorates the low temperature discharge and cycle performance of high voltage lithium ion batteries, so that the application of high voltage lithium ion batteries is severely limited. Inventive content [0003] It is an object of the present inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/139H01M4/36H01M4/62H01M10/0525
CPCY02E60/10
Inventor 於志锋彭冲李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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