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High-safety high-chemical-property high-magnification rechargeable lithium battery and manufacturing method thereof

A technology for rechargeable lithium batteries and chemical properties, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrodes of non-aqueous electrolyte batteries, etc. High rate discharge characteristics, particle distribution and fineness, and the effect of improving temperature resistance

Active Publication Date: 2021-04-20
贵州贵航新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Unfortunately, purely using the original lithium iron phosphate as the positive electrode functional material of lithium-ion batteries has the following disadvantages: first, the diffusion coefficient of lithium ions is relatively low, resulting in unsatisfactory rate performance of lithium-ion batteries; The rapid attenuation in the process of ions causes the cycle life of lithium-ion batteries to be short; thirdly, the thermal shock performance is poor, especially when charging at a high rate; it is easy to explode; finally, the temperature rise per unit charging power is large, which is unsafe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A high-safety, high-chemical performance and high-rate rechargeable lithium battery, the rechargeable lithium battery comprises lithium iron phosphate modified with 3,4,9,10-perylenetetracarboxylic dianhydride and tris(2-aminoethyl)amine, a polymer Vinylidene fluoride, conductive carbon mixed with N-methylpyrrolidone and coated on aluminum foil to form a positive electrode, and ball milled expanded graphite mixed with water, styrene-butadiene rubber, and carboxymethyl cellulose coated on copper foil to form a negative electrode, with PP / PE / PP material as composite insulating diaphragm, stainless steel shell, lithium sheet, composite electrolyte, insulating rubber and other seven-part structures;

[0026] The manufacturing method of the rechargeable lithium battery includes the following stages:

[0027] S1: Raw material preparation

[0028] ①Preparation of raw materials: prepare 9.2g of lithium iron phosphate, 0.1g of 3,4,9,10-perylenetetracarboxylic dianhydride, 0.02...

Embodiment 2

[0044] The whole is consistent with Example 1, the difference is:

[0045] The manufacturing method of the rechargeable lithium battery includes the following stages:

[0046] S1: Raw material preparation

[0047] ①Preparation of raw materials: prepare 80g of lithium iron phosphate, 1.2g of 3,4,9,10-perylenetetracarboxylic dianhydride, 0.3g of tris(2-aminoethyl)amine, 12g of polyvinylidene fluoride, 12g of conductive carbon black by weight , Sufficient amount of aluminum foil with thickness of 15μm-20μm, sufficient amount of ball milled expanded graphite 90g, styrene-butadiene rubber 9g, carboxymethyl cellulose 5g, enough copper foil with thickness of 8μm-15μm, EMC: DMC: LiPF6 / EC by mass ratio 1 : 1:1 ratio of composite electrolyte, stainless steel belt, PP / PE / PP composite insulating diaphragm with thickness of 25μm-30μm, lithium sheet, insulating rubber;

[0048] ②Preparation of auxiliary materials: prepare enough N-methylpyrrolidone and deionized water;

[0049] S2: Lithi...

Embodiment 3

[0052] The whole is consistent with Example 1, the difference is:

[0053] The manufacturing method of the rechargeable lithium battery includes the following stages:

[0054] S1: Raw material preparation

[0055] ①Preparation of raw materials: prepare 96kg of lithium iron phosphate, 0.9kg of 3,4,9,10-perylenetetracarboxylic dianhydride, 0.2kg of tris(2-aminoethyl)amine, 10kg of polyvinylidene fluoride, 10kg of conductive carbon black by weight , Sufficient amount of aluminum foil with thickness of 15μm-20μm, sufficient amount of ball-milled expanded graphite 100kg, styrene-butadiene rubber 7kg, carboxymethyl cellulose 3kg, sufficient copper foil with thickness of 8μm-15μm, EMC: DMC: LiPF6 / EC by mass ratio 1 : 1:1 ratio of composite electrolyte, stainless steel belt, PP / PE / PP composite insulating diaphragm with thickness of 25μm-30μm, lithium sheet, insulating rubber;

[0056] ②Preparation of auxiliary materials: prepare enough N-methylpyrrolidone and deionized water;

[00...

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Abstract

The invention discloses a high-safety high-chemical-property high-magnification rechargeable lithium battery and a manufacturing method thereof, and the button lithium battery comprises seven parts including a positive electrode which is formed through blending of perylene-3,4,9,10-tetracarboxylic dianhydride, tris (2-aminoethyl) amine modified lithium iron phosphate, polyvinylidene fluoride and conductive carbon and then coating on an aluminum foil; a negative electrode which is formed by coating of water-blended ball-milled expanded graphite, butadiene styrene rubber and carboxymethyl cellulose on a copper foil; a PP / PE / PP material as a composite insulating diaphragm, a stainless steel shell, a lithium sheet, a composite electrolyte and insulating rubber. The high-safety high-chemical-property high-magnification rechargeable lithium battery has the advantages of thermal shock resistance, high-rate charge-discharge performance, slow attenuation after multiple cycle periods, small temperature rise and high safety.

Description

technical field [0001] The invention relates to the technical field of lithium battery materials, in particular to a high-safety, high-chemical-performance, and high-rate rechargeable lithium battery and a manufacturing method thereof. Background technique [0002] At present, lithium-ion batteries are a relatively common battery system. However, as the transportation and digital industries rely more and more on lithium-ion batteries, the shortage of lithium resources will limit its further development. The world's ever-expanding demand for energy is one of the major challenges of the 21st century. With the rapid development of energy storage power sources and electric vehicles, higher requirements are placed on the performance of lithium-ion batteries, so the development of lithium-ion batteries with high energy density has become one of the focuses of research. Lithium-ion batteries have the advantages of high energy density, long cycle life, no memory effect, and environ...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 邓文书朱文军谢秋景王雄
Owner 贵州贵航新能源科技有限公司