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High energy density lithium ion battery

A lithium-ion battery, high energy density technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of SEI film instability, performance degradation, particle rupture, etc., to improve the first-time efficiency and energy Density, the effect of preventing damage

Active Publication Date: 2013-11-20
CONTEMPORARY AMPEREX TECH CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after lithium metal is added to the electrolyte by this method, the reaction speed is very fast; when lithium is replenished at the negative electrode, the formed SEI film is unstable, and the negative electrode material is easy to break; when lithium is replenished at the positive electrode, the commonly used negative active material Lithium cobalt oxide has poor resistance to excessive lithium intercalation, the particles are broken, and the performance is reduced; in addition, some lithium metal particles remaining on the electrode surface and the by-products of the lithium metal reaction will pierce the separator and cause battery safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1 (with reference to figure 1 )

[0052] Preparation of positive electrode sheet 1 for lithium-ion batteries: LiCoO 2 As the first positive electrode active material, LiNi 0.5 mn 0.3 co 0.2 o 2 As the second positive electrode active material (wherein the mass ratio of the first positive electrode active material to the second positive electrode active material is 80:20), PVDF is used as a binder, and conductive carbon (SP) is used as a conductive agent according to the positive electrode active material: PVDF: SP mass The ratio is 96:2:2, dissolved in the solvent N-methylpyrrolidone (NMP) and stirred evenly to make a slurry, and then the slurry is evenly coated on the positive electrode current collector 21 (using aluminum foil), and dried to make lithium The positive electrode sheet 1 of the ion battery.

[0053] Preparation of the first polymer conductive layer 5A: using carbon nanotubes (CNTs) as electronically conductive materials, Al 2 o 3 As an...

Embodiment 2

[0059] Embodiment 2 (with reference to figure 2 )

[0060] Preparation of positive electrode sheet 1 for lithium-ion batteries: LiCo 0.8 al 0.2 o 2 As the first positive electrode active material, Li 1.3 mn 2 o 4 As the second positive electrode active material (wherein the mass ratio of the first positive electrode active material to the second positive electrode active material is 95:5), PVDF is used as a binder, and conductive carbon (SP) is used as a conductive agent, according to the positive electrode active material: PVDF: The mass ratio of SP is 96:2:2, which is dissolved in N-methylpyrrolidone (NMP) and stirred evenly to make a slurry, and then the slurry is evenly coated on the positive electrode current collector 21 (using aluminum foil), and then dried Lithium-ion battery positive pole piece 1.

[0061] Preparation of the first polymer conductive layer 5A: using conductive carbon (SP) as the electronically conductive material, SiO 2As an ion-conducting mat...

Embodiment 3

[0067] Embodiment 3 (with reference to image 3 )

[0068] Preparation of positive electrode sheet 1 for lithium-ion batteries: LiCoO 2 As the first positive electrode active material, LiNi 0.8 co 0.15 al 0.05 o 2 As the second positive electrode active material (wherein the mass ratio of the first positive electrode active material to the second positive electrode active material is 60:40), PVDF is used as a binder, and conductive carbon (SP) is used as a conductive agent according to the positive electrode active material: PVDF: SP mass The ratio is 96:2:2, dissolved in the solvent N-methylpyrrolidone (NMP) and stirred evenly to make a slurry, and then the slurry is evenly coated on the positive electrode current collector 21 (using aluminum foil), and dried to make lithium Positive pole piece 1 of ion battery.

[0069] Preparation of the first polymer conductive layer 5A: using CNT as an electronically conductive material, Li 3 PO 4 As an ion-conducting material, SB...

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Abstract

A provided high energy density lithium ion battery comprises a cathode piece, an anode piece, an isolated film, a positive pole lithium-supplementing layer, an electrolyte, a first polymer conductive layer disposed between the cathode piece and the positive pole lithium-supplementing layer, and a second conductive layer disposed between the positive pole lithium-supplementing layer and the isolated film; the cathode piece comprises a positive pole current collector and a positive pole film; the anode piece comprises a negative pole current collector and a negative pole film; and the positive pole film of the cathode piece at least comprises a first positive pole active material with high initial efficiency and a second positive pole active material with lithium-excessive-insertion resistance. The high energy density lithium ion battery is improved in initial efficiency and energy density of the lithium ion battery, and has lithium-excessive-insertion resistance; the high energy density lithium ion battery is capable of controlling the speed and the uniformity of lithium insertion when the positive pole lithium-supplementing layer supplements lithium for the cathode piece, and further protecting the cathode piece; and the high energy density lithium ion battery is capable of inhibiting penetration of the isolated film by residual metal particles after lithium supplement, and further reducing potential safety hazard.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery with high energy density. Background technique [0002] Because lithium-ion batteries have the characteristics of high energy density, long service life, and environmental protection, they are widely used in portable electronic products such as mobile phones, notebook computers, and digital cameras, and have good application prospects in fields such as electric vehicles. With the expansion of the application range, higher requirements are put forward for the performance of lithium-ion batteries, especially with the popularization of smart phones, the demand for high-energy-density lithium-ion batteries is increasing day by day. [0003] At present, carbon-based materials are used as negative electrode active materials for lithium-ion batteries, and their first-time efficiency is low, only reaching 90% and the theoretical gram capacity is only 372mAh / g. ...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/42
CPCY02E60/122Y02E60/10
Inventor 黄世霖牛少军何东铭
Owner CONTEMPORARY AMPEREX TECH CO
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