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Preparation method of low-temperature lithium ion battery

A lithium-ion battery, low-temperature technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as limited degree, achieve high energy density, improve low-temperature electrochemical performance, and reasonable design.

Inactive Publication Date: 2020-05-15
LONG POWER SYST NANTONG CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the degree of improvement in low-temperature electrochemical performance is limited only from the improvement of electron migration.

Method used

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  • Preparation method of low-temperature lithium ion battery
  • Preparation method of low-temperature lithium ion battery
  • Preparation method of low-temperature lithium ion battery

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Experimental program
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Embodiment Construction

[0033] Such as figure 1 , 2 As shown, a method for preparing a low-temperature lithium-ion battery 100 includes the following steps,

[0034] Step 1: Add 7 grams of polyvinylidene fluoride copolymer (PVDF-HFP) into 180 grams of acetone to make it fully stirred and dissolved to form a viscous liquid.

[0035] Step 2: The production procedure of the positive electrode sheet 110 is as follows: 60 grams of plasticizer DBP and 140 grams of lithium iron phosphate positive electrode material (lithium iron phosphate material with secondary micron particles composed of primary nanoparticles) and 2.5% carbon The nanotube conductive agent and 1.5% SP conductive agent are fully mixed and added to the above viscous liquid, and stirred evenly with a mixer to form a viscous positive electrode slurry. The obtained positive electrode slurry was evenly coated on both sides of the carbon-coated aluminum foil, and kept in a vacuum oven at 80° C. for 4 hours to remove the solvent acetone. The p...

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Abstract

The invention relates to a preparation method of a low-temperature lithium ion battery. The lithium ion battery comprises a porous positive plate with high electron conductivity and high ion conductivity, the active material is a positive electrode material of secondary micron particles formed by primary nano particles; according to the porous negative plate with high electronic conductivity and high ionic conductivity, an active negative electrode material is a negative electrode material of secondary micron particles formed by primary nano particles, a ceramic diaphragm with high porosity and high wettability, and an electrolyte with low viscosity, low melting point and high low-temperature ionic conductivity. The lithium ion battery disclosed by the invention still maintains the discharge capacity of more than 80% under the condition of extremely low temperature (-45 DEG C), and has good low-temperature electrochemical performance, the low-temperature working temperature range of the lithium ion battery can be expanded, and the problems of electric vehicles and energy storage application of the lithium ion battery at the extremely low temperature are solved.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a manufacturing method of a low-temperature lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, long charge and discharge life, low self-discharge rate and no memory effect, making them more and more widely used in civilian markets such as portable electronic devices and power tools. However, its poor low-temperature performance limits its application in special fields such as aviation, aerospace, special communications, polar expeditions, and military affairs. For example, the low-temperature performance of current lithium-ion batteries, especially in low-temperature environments below -40°C, is very poor, mainly manifested in the sharp attenuation of discharge capacity and the drop of discharge voltage platform. [0003] The main reason that affects the low-temperature performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M10/0525
CPCH01M10/0525H01M10/0585Y02E60/10Y02P70/50
Inventor 黄耀泽黄碧英萨多威.R.唐纳德
Owner LONG POWER SYST NANTONG CO LTD
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