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Cylindrical lithium ion battery and preparation method thereof

A lithium-ion battery, cylindrical technology, applied in electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of small lithium ion diffusion coefficient, high production conditions, increased production costs, etc., to reduce lithium ion consumption , Embedding/de-embedding performance is good, and the effect of saving production cost

Pending Publication Date: 2020-05-05
SHENZHEN ZHUONENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium iron phosphate battery is a common 18650 lithium battery, which has relatively high specific capacity, stable working pressure and good cycle life, and is rich in raw materials, low in price and good in stability. It is currently a very promising development at home and abroad. One of the green materials, but it also has disadvantages such as low conductivity and small diffusion coefficient of lithium ions, which limit its practical application
In addition, compared with general battery production, 18650 lithium batteries have high requirements on production conditions, and each process in the battery manufacturing process will have a certain amount of waste, which further increases production costs

Method used

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  • Cylindrical lithium ion battery and preparation method thereof
  • Cylindrical lithium ion battery and preparation method thereof
  • Cylindrical lithium ion battery and preparation method thereof

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preparation example Construction

[0052] This embodiment also provides a method for preparing the aforementioned cylindrical lithium-ion battery, including:

[0053] The preparation steps of the positive electrode sheet: mix the positive electrode coating according to the formula amount, add nitrogen-methylpyrrolidone solvent (NMP) and mix to obtain a positive electrode coating with a solid content of 53%, and coat the positive electrode coating on the positive electrode metal foil On the sheet, after drying at 120-150°C, it is rolled and cut into a strip-shaped positive electrode sheet with a width of 56.5±1mm and a thickness of 145-149μm, and the gap metal foil at 1 / 3 of the length direction of the strip-shaped positive electrode sheet The positive electrode ear is welded on the chip to make a positive electrode piece;

[0054] Preparation steps of the negative electrode sheet: mix the negative electrode coating according to the formula, add deionized water and mix to make a negative electrode coating with a...

Embodiment 1

[0062]The preparation of negative plate: mix suspension agent dry powder 1.4%wt (mass fraction), graphite powder 94.8%wt, conductive agent 1.8%wt, binding agent 2.0%wt, then add deionized water and mix evenly to make a solid The negative electrode slurry with a content of 50% is intermittently coated on a metal copper foil with a thickness of 8 μm. After drying at a temperature of 100-130 ° C, it is rolled into a negative electrode sheet with a thickness of about 120 μm, and cut into long strips. The width is 58.0mm. A total of 2pcs negative lugs are welded on the gap foil to make a negative electrode sheet. There are 1pcs tabs at the head and tail of the negative electrode sheet, of which the head is a short tab and the tail is a long tab. .

[0063] Preparation of positive electrode sheet: 2.5%wt of binder dry powder, 1.5%wt of conductive agent (wherein, the content of conductive agent 1 is 1%wt, and the content of conductive agent 2 is 0.5%wt), dispersant 0.2%wt, active mat...

Embodiment 2

[0067] Preparation of negative electrode sheet: Mix 1.6%wt of suspending agent dry powder, 94.3%wt of graphite powder, 2.1%wt of conductive agent, and 2.0%wt of binder, then add deionized water and mix evenly to make a solid content of 50%. Negative electrode slurry, intermittently coated on 8μm thick metal copper foil, dried at a temperature of 100-130°C, rolled into a negative electrode sheet with a thickness of about 123μm, cut into long strips, and the width of the electrode sheet is 58.0mm , Weld one long and one short negative tab at the gap foil to make a negative plate. There are 1pcs tabs at the head and tail of the negative plate, of which the head is a short tab and the tail is a long tab.

[0068] Preparation of positive electrode sheet: 2.6%wt of binder dry powder, 1.7%wt of conductive agent (wherein, the content of conductive agent 1 is 1%wt, and the content of conductive agent 2 is 0.7%wt), dispersant 0.3%wt, active material 95.4%wt Mix with an appropriate amoun...

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Abstract

The invention discloses a cylindrical lithium ion battery. The lithium ion battery comprises a positive plate, a negative plate, a diaphragm, an electrolyte and a battery housing. A positive lug is arranged at the 1 / 4-1 / 2 position of the positive plate in the length direction, a 1pcs short negative lug and a 1pcs long negative lug are arranged at the two ends of the negative plate in the length direction respectively, and meanwhile, formulas and preparation processes of the positive plate and the negative plate of the battery are improved; the battery is long in service cycle life, high in temperature adaptability and low in battery cost. The invention further discloses a preparation method of the cylindrical lithium ion battery, the production process is simple, the cost is low, the lithium ion battery with excellent comprehensive performance can be obtained by combining with an improved raw material formula and an electrode plate structure, and the cylindrical lithium ion battery isapplied to the market fields of digital, power, energy storage and the like and can completely replace a lead-acid battery, a nickel-metal hydride battery and the like.

Description

technical field [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to a cylindrical lithium-ion battery and a preparation method thereof. Background technique [0002] 18650 is the originator of lithium-ion batteries. It has the advantages of light weight, large capacity, and no memory effect. Its capacity is generally between 1200mah and 3600mah, and its cycle life can reach more than 500 times in normal use, which is more than twice that of ordinary batteries. High safety performance, non-explosive, non-flammable, non-toxic, non-polluting. In recent years, with the continuous development of the new energy industry, the application field of lithium-ion batteries has become wider and wider. Lithium iron phosphate battery is a common 18650 lithium battery, which has relatively high specific capacity, stable working pressure and good cycle life, and is rich in raw materials, low in price and good in stability. It is currently...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M4/36H01M4/58H01M4/583H01M4/62H01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/04H01M10/0525H01M10/0587B82Y30/00
CPCH01M4/362H01M4/5825H01M4/583H01M4/62H01M4/621H01M4/623H01M4/624H01M4/133H01M4/136H01M4/1393H01M4/1397H01M4/0404H01M4/043H01M10/0525H01M10/0587B82Y30/00H01M50/531Y02E60/10Y02P70/50
Inventor 欧瑞先朱燕飞黄国文黄延新韦丽娟
Owner SHENZHEN ZHUONENG NEW ENERGY TECH
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