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Phosphorus-contained flameproof additive agent for lithium ion cell electrolysing solution and method of use thereof

A flame retardant additive, lithium ion battery technology, applied in secondary batteries, chemical instruments and methods, circuits, etc. Flammability, good charge-discharge performance, little effect on conductivity

Inactive Publication Date: 2007-12-05
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two types of phosphorus-containing flame retardant additives disclosed have certain flame retardancy, the addition of the electrolyte tends to increase its viscosity, reduce its electrical conductivity, and deteriorate its wettability, and it is also harmful to the battery. Cycling performance has a large negative impact

Method used

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  • Phosphorus-contained flameproof additive agent for lithium ion cell electrolysing solution and method of use thereof
  • Phosphorus-contained flameproof additive agent for lithium ion cell electrolysing solution and method of use thereof
  • Phosphorus-contained flameproof additive agent for lithium ion cell electrolysing solution and method of use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This phosphorus-containing flame retardant additive is a phosphorus-containing organic compound whose basic structural formula is as follows

[0020]

[0021] That is, the R in the general formula 1 , R 2 , R 3 Both are alkyl CH 3 ; where R 1 , R 2 , R 3 The number of carbon atoms n is 1.

[0022] The GV-2100size#1 type falling ball viscometer produced by Barnant Company is used to measure the phosphorus-containing flame-retardant additive (C) of this embodiment 1 and the existing two kinds of phosphorus-containing flame-retardant additives (A), (B) (wherein n= 1) and compare the viscosity (measurement range: 1-10Pa·s), record the time when the steel ball falls from the first baseline to the measurement baseline. For A, B, C were measured in parallel five times to get the average value. Calculation method: at a certain temperature, the viscosity of the liquid to be tested η=k×(ρ 刚球 -ρ 待测液 ) × t. Among them, k is the viscosity coefficient (0.3); ρ 刚球 is th...

Embodiment 2

[0027] The using method of the phosphorus-containing flame retardant additive provided by embodiment 1 is: the dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) are according to 1: 1: 1 (mass ratio) Mixed in proportion and made into 1M LiPF 6 The electrolyte solution, and then add 2wt% vinylene carbonate (VC) and the above-mentioned phosphorus-containing organic compound with a weight ratio of 5wt% therein to obtain a lithium-ion battery flame-retardant electrolyte.

[0028] In order to measure the charging and discharging effect of the battery using the electrolyte prepared in this example, the following operations are performed: use N-methyl-2 pyrrolidone (NMP) and LiCoO 2 (produced by OMG Company of the United States), acetylene black, and polyvinylidene fluoride (PVDF) (mass ratio: 85%:8%:7%) are evenly mixed and then coated on the aluminum foil current collector, and vacuum-dried at 120°C for 12 hours to prepare Positive sheet. Mix artif...

Embodiment 3

[0030] Another using method of the phosphorus-containing flame retardant additive provided by embodiment 1 is: mix dimethyl carbonate (DMC), ethylene carbonate (EC) and ethyl methyl carbonate (EMC) according to 1: 1: 1 (mass ratio ) ratio, and dubbed 1M LiPF 6 The electrolyte solution, and then add the above-mentioned phosphorus-containing organic compound with a weight ratio of 5wt%, 10wt%, 15wt%, 20wt%, 30wt%, 40wt%, and dissolve it to obtain a lithium-ion battery flame-retardant electrolyte.

[0031] In order to evaluate the flammability of the lithium-ion battery electrolyte, the self-extinguishing time (Self-extinguishing time) can be used to measure it specifically. The specific steps are to make a glass wool ball with a diameter of 5mm from glass wool, weigh it and place it in a folded On the "O"-shaped thin iron wire, use a syringe to take out the electrolyte solution with different proportions of flame-retardant additives, inject it on the glass wool and ignite it qui...

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Abstract

The invention publishes a phosphoric flame-resistant additive which is used in the solution of the lithium ion battery, which is a phosphoric organic compound, its basic structural formula likes right, or is the isometry body of the state structure; of which R1, R2, R3 are alkyl CnH2n+1 or alkene base CnH2n-1, and the carbon atom number of R1, R2, R3 is 1<=n<=4. The application method of the phosphoric flame-resistant additive is adding the phosphoric flame-resistant additive in the ordinary lithium ion battery solution; its quantity is the 5 to 40wt% of the lithium ion battery solution weight. The phosphoric flame-resistant additive has high phosphoric quantity, the good flame-resistant effect, and low viscosity, not only enables the electrolyte to have the good flame retardance, simultaneously has little influence of viscosity, conductivity of electrolyte, has good wettability with positive and negative pole piece and the membrane, and has good charging and discharging performance.

Description

technical field [0001] The invention relates to an additive technology for manufacturing lithium-ion batteries, in particular to a phosphorus-containing flame-retardant additive for lithium-ion battery electrolytes and an application method thereof. Background technique [0002] Compared with other rechargeable batteries, lithium-ion batteries have the advantages of high energy density, high operating voltage, long cycle life, and low self-discharge. At present, small-capacity lithium-ion batteries have been successfully used in mobile phones, digital cameras, notebook computers, etc. At the same time, large-capacity and high-power lithium-ion power batteries also have good application prospects. However, the main obstacle to the development of large-capacity lithium-ion power batteries is safety issues, especially under abuse (such as thermal shock, overcharge, overdischarge, short circuit, etc.), there are often safety hazards such as fire and explosion. To develop large...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40C09K5/00H01M10/056H01M10/0567
CPCY02E60/122Y02E60/10
Inventor 周代营李伟善左晓希刘建生
Owner SOUTH CHINA NORMAL UNIVERSITY
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