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A method for manufacture a lithium ion battery in which titanium nitride is deposited on that surface of a positive electrode sheet

A technology for lithium-ion batteries and positive pole pieces, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problem of limiting the high-current charge and discharge performance of lithium iron phosphate batteries, deteriorating the consistency of single-cell aging rates, and parallel branch circuits The problem of uneven current distribution among different devices can achieve the effect of improving high-current charging and discharging performance, improving temperature balance, and enhancing transport capacity.

Inactive Publication Date: 2019-01-08
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The higher the average battery temperature, the higher the temperature unevenness, and the shorter the cycle life of the battery pack
Uneven temperature distribution will lead to uneven current distribution between parallel branches, which will worsen the uniformity of cell aging rate
In addition, the internal pore structure of the battery pole piece will also seriously hinder the transport of electrons inside the pole piece, which largely limits the further improvement of the high-current charge and discharge performance of lithium iron phosphate batteries.

Method used

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  • A method for manufacture a lithium ion battery in which titanium nitride is deposited on that surface of a positive electrode sheet
  • A method for manufacture a lithium ion battery in which titanium nitride is deposited on that surface of a positive electrode sheet
  • A method for manufacture a lithium ion battery in which titanium nitride is deposited on that surface of a positive electrode sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Production of lithium iron phosphate positive electrode with titanium nitride deposited on the surface

[0057] 942 grams of lithium iron phosphate powder, 13 grams of conductive carbon black and 45 grams of polyvinylidene fluoride were weighed at a mass ratio of 94.2:1.3:4.5, and vacuum-dried at 100° C. for 10 hours.

[0058] Weigh 798 grams of N-methylpyrrolidone solvent and place it in a vacuum stirring tank, add polyvinylidene fluoride powder and stir, and the stirring speed is 20 Hz. After stirring for 1.5 hours, conductive carbon black was added, and stirring was continued for 3 hours at a speed of 25 Hz. Then, lithium iron phosphate powder was added, and stirring was continued for 3 hours at a rotational speed of 20 Hz and a vacuum of -0.08 Mpa to obtain a lithium iron phosphate slurry. Sieve the lithium iron phosphate slurry with a 150-mesh stainless steel screen.

[0059] The sieved lithium iron phosphate slurry was coated on both sides on a 20 micron alum...

Embodiment 2

[0074] 1. Production of lithium iron phosphate positive electrode with titanium nitride deposited on the surface

[0075] According to the mass ratio of 94.2:1.3:4.5, 942 grams of lithium iron phosphate powder, 13 grams of conductive carbon black, and 45 grams of polyvinylidene fluoride were weighed and dried in vacuum at 100° C. for 10 hours.

[0076] Weigh 798 g of N-methylpyrrolidone solvent and place it in a vacuum stirring tank, add polyvinylidene fluoride, and stir at a stirring speed of 20 Hz for 1.5 hours. Then conductive carbon black was added, and stirring was continued for 3 hours at a speed of 25 Hz. Then, lithium iron phosphate powder was added, and stirred at a stirring speed of 20 Hz and a vacuum degree of -0.08 Mpa for 3 hours to prepare a lithium iron phosphate slurry. Sieve the lithium iron phosphate slurry using a 150-mesh stainless steel screen.

[0077] Use a transfer coater to coat the sieved lithium iron phosphate slurry on a 20-micron thick aluminum f...

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Abstract

The invention relates to a manufacturing method of a lithium ion battery in which titanium nitride is deposited on the surface of a positive electrode sheet. The method comprises weighing lithium ironphosphate powder according to the mass ratio of (92-96): (1-4): (2-6), vacuum baking conductive carbon black and polyvinylidene fluoride powder respectively; Dispersing polyvinylidene fluoride powderin N-methyl pyrrolidone solution and stirring to obtain polyvinylidene fluoride glue; Adding conductive carbon black into polyvinylidene fluoride colloidal solution and then adding lithium iron phosphate powder into polyvinylidene fluoride colloidal solution to obtain lithium iron phosphate slurry; Sieved and coated on the upper and lower surfaces of the aluminum foil to obtain a lithium iron phosphate electrode sheet; A suspension of titanium nitride is prepare from titanium nitride nano-powder, sprayed on that upper and low surfaces of the electrode plates by an ultrasonic atomization preparation system, and finally rolled to obtain a surface-deposited titanium nitride lithium iron phosphate cathode plate. As that titanium nitride nano particle are sprayed on the surface of the lithiumiron phosphate positive electrode sheet, the high-current char and discharging performance is improved, the process is simple and easy to industrialize.

Description

technical field [0001] The invention relates to a manufacturing method of a lithium ion battery in which titanium nitride is deposited on the surface of a positive pole piece, and belongs to the technical field of lithium ion battery manufacturing. technical background [0002] Lithium-ion batteries have the advantages of high specific energy density, high working voltage platform, long cycle life, no memory effect, and environmental protection. They have been widely used in portable small devices, notebook computers, aerospace fields, electric vehicles, new energy vehicles and Large-scale energy storage power stations and other fields. Since the implementation of "Ten Cities, Thousand Vehicles" in 2009, my country has continuously and vigorously promoted the development of the new energy vehicle industry. Under the impetus of new energy vehicles, the lithium battery industry can be described as making great strides in 2014. The development of new energy vehicles must ensu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0585H01M4/1397H01M4/04H01M10/0525
CPCH01M4/0404H01M4/0419H01M4/1397H01M10/0525H01M10/0585Y02E60/10Y02P70/50
Inventor 池毓彬洪礼训林应斌黄志高
Owner FUJIAN NORMAL UNIV
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