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Lithium ion battery

A lithium-ion battery and electrolyte technology, applied in secondary batteries, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of graphite peeling degree differences, formation speed and composition differences, etc., to increase current density, promote formation, The effect of improving safety performance

Active Publication Date: 2012-03-07
DONGGUAN AMPEREX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different current densities mean differences in SEI formation speed and composition, resulting in differences in graphite exfoliation at different Overhangs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Lithium-ion safety battery of the present invention

[0052] The composition of the electrolyte:

[0053] Mix ethylene carbonate (EC), propylene carbonate (PC), and dimethyl carbonate (DMC) in a volume ratio of 1:1:1, add dimethyl methyl phosphate DMMP accounting for 15 wt% of the total mass of the electrolyte, And add 1% vinylene carbonate (VC), 1% vinyl ethylene carbonate (VEC), 3% fluoroethylene carbonate (FEC) as film-forming agent, and dissolve 1M LiPF6 as lithium salt.

[0054] Preparation of the cathode sheet:

[0055] Take LiCoO2 as the active material, add 2% Super P as the conductive agent, and 2% PVDF as the binder. After fully stirring and mixing in the NMP solvent system, it is coated on a 14um thick Al foil, and after drying , and then cold pressed to a certain thickness to obtain the cathode sheet. Solder the tab at the cathode end and leave it for winding.

[0056] Preparation of the anode sheet:

[0057] Take FSNC as the active material, add 2% Sup...

Embodiment 3

[0065] The lithium ion safe battery of the present invention,

[0066] Electrolyte preparation:

[0067] Mix ethylene carbonate (EC), propylene carbonate (PC), and dimethyl carbonate (DMC) in a volume ratio of 1:1:1, add dimethyl methylphosphate DMMP accounting for 6wt% of the total mass of the electrolyte, And add 1% vinylene carbonate (VC), 2% vinyl ethylene carbonate (VEC), 2% fluoroethylene carbonate (FEC) as film-forming protective agent, and dissolve 1M LiPF6 as lithium salt.

[0068] Preparation of the cathode sheet:

[0069] Take LiCoO2 as the active material, add 2% Super P as the conductive agent, and 2% PVDF as the binder. After fully stirring and mixing in the NMP solvent system, it is coated on a 14um thick Al foil, and after drying , and then cold pressed to a certain thickness to obtain the cathode sheet. Solder the tab at the cathode end and leave it for winding.

[0070] Preparation of the anode sheet:

[0071] Take FSNC as the active material, add 2% Sup...

Embodiment 4

[0079] The lithium ion safe battery of the present invention,

[0080] Electrolyte preparation:

[0081] Mix ethylene carbonate (EC), propylene carbonate (PC), and dimethyl carbonate (DMC) in a volume ratio of 1:1:1, add dimethyl methyl phosphate DMMP accounting for 10 wt% of the total mass of the electrolyte, And add 1% vinylene carbonate (VC), 2% vinyl ethylene carbonate (VEC), 2% fluoroethylene carbonate (FEC) as film-forming protective agent, and dissolve 1M LiPF6 as lithium salt.

[0082] Preparation of the cathode sheet:

[0083] Take LiCoO2 as the active material, add 2% Super P as the conductive agent, and 2% PVDF as the binder. After fully stirring and mixing in the NMP solvent system, it is coated on a 14um thick Al foil, and after drying , and then cold pressed to a certain thickness to obtain the cathode sheet. Solder the tab at the cathode end and leave it for winding.

[0084] Preparation of the anode sheet:

[0085] Take FSNC as the active material, add 2% ...

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PUM

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Abstract

The invention relates to the technical field of lithium ion batteries, and especially relates to a high safety lithium ion battery. The lithium ion battery is characterized in that: the lithium ion battery comprises a cathode plate, an anode plate, a separation film and an electrolyte, and two ends of the anode plate in a length direction are respectively provided with at least one tab; the electrolyte comprises a phosphate ester flame retardant additive; and the electrolyte comprises a film forming additive, and the head and the tail of the anode plate are respectively welded with one or more tabs which have shunting effects. So the prepared monomeric battery has a multi-tab structure. The electrolyte in the battery of the invention, which has a good flame retardation effect, allows the safety of the battery to be effectively improved; and the introduction of the film forming additive and the current optimization by the two tabs allow the compatibility of the anode plate and the electrolyte to be improved, and the anode plate to be prevented from being destroyed by the flame retardant additive.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with high safety performance. Background technique [0002] At present, the solvents of lithium-ion battery electrolytes are mostly flammable carbonate-based mixed systems. Once thermal runaway or other safety hazards occur, flammable solvents will further increase the possibility of battery fire or even explosion, seriously affecting the safety of lithium-ion batteries. sex. [0003] In order to solve the potential safety hazards caused by the flammability of lithium-ion battery electrolyte solvents, a common method to improve the electrolyte is to introduce additives into the electrolyte to make the electrolyte a non-flash point or non-flammable electrolyte. Among them, phosphorus-based flame retardant additives have good flame-retardant effect and are one of the most promising additives. However, the poor compatibility between phosphorus-ba...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M4/13
CPCY02E60/10
Inventor 任建勋汪颖付成华谢远森于子龙陈治褚春波
Owner DONGGUAN AMPEREX TECH
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