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Low-temperature-resistant lithium-ion battery long in service life

A lithium-ion battery, low-temperature-resistant technology, applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems of poor charge and discharge performance, short cycle life, low energy density, etc., to achieve high and low temperature cycle performance, Excellent performance and good compatibility

Active Publication Date: 2017-08-25
北京北方华创新能源锂电装备技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a long-life lithium ion battery with low temperature resistance, which overcomes the problems of poor charge and discharge performance, short cycle life and low energy density of existing lithium ion batteries at low temperature

Method used

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  • Low-temperature-resistant lithium-ion battery long in service life

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Embodiment 1

[0027] Example 1: LiNi with D50 of 8 μm is selected 0.5 co 0.2 mn 0.3 o 3 (hereinafter referred to as NCM523) as the cathode material. First mix the positive electrode material NCM523 and the conductive agent acetylene black (hereinafter referred to as HS-100), then add the binder PVDF and the solvent N-methylpyrrolidone (hereinafter referred to as NMP), and stir to prepare the positive electrode slurry. The distribution ratio of positive electrode material, conductive agent and binder is in accordance with NCM523:HS-100:PVDF=95:3:2. The slurry is coated, rolled, cut and dried to obtain a positive electrode sheet.

[0028] Modified natural graphite was selected as the negative electrode material. First mix natural graphite C, conductive agent carbon black (hereinafter referred to as SPC), and carboxymethyl cellulose (hereinafter referred to as CMC), then add solvent water and styrene-butadiene rubber (hereinafter referred to as SBR), and stir to prepare negative electrode...

Embodiment 2

[0030] Example 2: NCM523 with a D50 of 8 μm is selected as the positive electrode material. First mix the positive electrode material NCM523 and the conductive agent HS-100, then add the binder PVDF and the solvent NMP, and stir to prepare the positive electrode slurry. The distribution ratio of each component is in accordance with NCM523:HS-100:PVDF=94:3:3. The slurry is coated, rolled, cut and dried to obtain a positive electrode sheet.

[0031] Modified natural graphite was selected as the negative electrode material. First mix natural graphite C, conductive agent SPC, and CMC, then add solvent water and SBR, and stir to prepare negative electrode slurry. The distribution ratio of each component is in accordance with C:SPC:CMC:SBR=95:2:1:2. The slurry is coated, rolled, cut and dried to obtain a negative electrode sheet.

[0032] The positive electrode sheet, the negative electrode sheet, and the diaphragm are wound and hot pressed to obtain a core. The battery is inje...

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Abstract

The invention discloses a low-temperature-resistant lithium-ion battery long in service life. The median particle diameter D50 of an active material at the positive electrode of the lithium-ion battery is larger than or equal to 5.5 micrometers and smaller than or equal to 10 micrometers, the negative electrode is composed of a modified graphite material, and a low-temperature additive is added into an electrolyte solution. The lithium-ion battery has excellent low-temperature charging and discharging performance and has a long cycle life at the low temperature, and the lithium-ion battery can be used as an energy storage battery or an electric vehicle battery in the low-temperature environment.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a low-temperature-resistant and long-life lithium-ion battery. Background technique [0002] In the era of new energy, lithium-ion batteries have been widely used. People have higher requirements for the charging and discharging performance of lithium-ion batteries in low-temperature environments. They hope that they can be used in northern cold regions or in the wild, and can be used in power vehicles or energy storage fields. However, the current research on the low-temperature characteristics of lithium-ion batteries is obviously lagging behind. When the ambient temperature is lower than 0°C, the performance of the battery will decline significantly or it will not work normally. . Therefore, it is of great significance to develop long-life Li-ion batteries that are resistant to low temperatures. [0003] For most systems, the decrease of charge transfer rate and lithium io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/0567H01M10/058
CPCH01M4/364H01M4/505H01M4/525H01M4/587H01M10/0525H01M10/0567H01M10/058H01M2300/0037Y02E60/10Y02P70/50
Inventor 丁莹刘晓晔杨映华
Owner 北京北方华创新能源锂电装备技术有限公司
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