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Lithium-rich manganese-based high-energy-density lithium-ion battery and preparation method thereof

A lithium-ion battery, high energy density technology, applied in electrolyte battery manufacturing, secondary batteries, battery electrodes, etc., can solve the problems that restrict the development and application of silicon materials, and achieve high energy density, high safety factor, and long cycle life. Effect

Inactive Publication Date: 2016-02-24
SHENZHEN HONGTAI BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity loss caused by volume expansion after cycling seriously restricts the development and application of silicon materials.

Method used

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  • Lithium-rich manganese-based high-energy-density lithium-ion battery and preparation method thereof
  • Lithium-rich manganese-based high-energy-density lithium-ion battery and preparation method thereof
  • Lithium-rich manganese-based high-energy-density lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The preparation of positive and negative electrode slurries is one of the keys to the excellent performance of the patented battery. Here, combined with the attached figure 1 with attached figure 2 Describe in detail.

[0053] For the preparation of positive electrode slurry, see attached figure 1 . Operation a1, Al by mass ratio 95:5 2 o 3 Coated 0.3Li 2 MnO 3 -0.7LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 with Li 3 V 2 (PO 4 ) 3 Mixing ball milling for 4-24 hours; process a2, dissolving PVDF in NMP to make a glue solution with a mass fraction of 10%; process a3, adding CNT slurry, after high-speed dispersion for 1 hour, adding S-P high-speed stirring for 1-2 hours; process a4, Add the mixed active material prepared in step a1 in 3-5 times, and stir for 3-6 hours; step a5, add a small amount of NMP, adjust the viscosity to 6000-12000cp, and obtain the positive electrode slurry to be coated. The ratio of the positive electrode slurry active material, CNT, S-P, and PVDF ...

Embodiment 2

[0062] For the preparation of positive electrode slurry, see attached figure 1 . Operation a1, Al by mass ratio 98:2 2 o 3 Coated 0.3Li 2 MnO 3 -0.7LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 with Li 3 V 2 (PO 4 ) 3 Mixing ball milling for 4-24 hours; process a2, dissolving PVDF in NMP to make a glue solution with a mass fraction of 10%; process a3, adding CNT slurry, after high-speed dispersion for 1 hour, adding S-P high-speed stirring for 1-2 hours; process a4, Add the mixed active material prepared in step a1 in 3-5 times, and stir for 3-6 hours; step a5, add a small amount of NMP, adjust the viscosity to 6000-12000cp, and obtain the positive electrode slurry to be coated. The ratio of the positive electrode slurry active material, CNT, S-P, and PVDF is 94:1:2:3.

[0063] For the preparation of negative electrode slurry, see attached figure 2 . Process b1, mixing carbon-coated silicon carbide material (80% by mass of silicon carbide) and artificial graphite at a mass ratio ...

Embodiment 3

[0071] For the preparation of positive electrode slurry, see attached figure 1 . Operation a1, Al by mass ratio 95:5 2 o 3 Coated

[0072] 0.5Li 2 MnO 3 -0.5LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 with Li 3 V 2 (PO 4 ) 3 Mixing ball milling for 4-24 hours; process a2, dissolving PVDF in NMP to make a glue solution with a mass fraction of 10%; process a3, adding CNT slurry, after high-speed dispersion for 1 hour, adding S-P high-speed stirring for 1-2 hours; process a4, Add the mixed active material prepared in step a1 in 3-5 times, and stir for 3-6 hours; step a5, add a small amount of NMP, adjust the viscosity to 6000-12000cp, and obtain the positive electrode slurry to be coated. The ratio of the positive electrode slurry active material, CNT, S-P, and PVDF is 94:1:2:3.

[0073] For the preparation of negative electrode slurry, see attached figure 2 . Process b1, mixing carbon-coated silicon carbide material (80% by mass of silicon carbide) and artificial graphite at a m...

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Abstract

The invention discloses a lithium-rich manganese-based high-energy-density lithium-ion battery and a preparation method thereof. According to the battery, with a lithium-rich manganese-based material doped with lithium vanadium phosphate as a positive electrode and a mixed material of a nano silicon-carbon material and graphite as a negative electrode, through optimal configuration of a conductive agent, a diaphragm, an electrolyte and the like, the influences to the battery performance due to the structure change of the lithium-rich manganese-based material and silicon volume expansion in a cyclic process are effectively reduced. The preparation process of the battery comprises the following steps: active material premixing, pulping, film production, winding / laminating, packaging, liquid injection, secondary packaging, formation, inspection and the like. The battery has the advantages of high energy density, high safety coefficient, relatively long cycle lifetime and the like and can be used as a dynamical chemical power source.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-rich manganese-based high-energy-density lithium-ion battery and a preparation method thereof. Background technique [0002] Since the first commercialization of lithium-ion batteries in the early 1990s, they have been widely used in portable electronic products such as mobile phones and notebook computers due to their high specific energy, long cycle life, low self-discharge, and environmental friendliness. , electric tools, etc. In the past ten years, with the advancement of materials and the improvement of production technology, lithium batteries are rapidly being used in the fields of electric bicycles, hybrid vehicles and pure electric vehicles. At the same time, the miniaturization and portability of electronic products and the long mileage demand of electric vehicles all urgently require the development of lithium-ion batteries in the direction of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/36H01M4/38H01M4/505H01M4/587H01M4/62H01M10/0567H01M10/0525H01M10/058H01M2/14H01M50/403H01M50/434H01M50/449H01M50/457
CPCH01M4/366H01M4/386H01M4/505H01M4/587H01M4/62H01M4/628H01M10/0525H01M10/0567H01M10/058H01M50/431H01M50/403Y02E60/10Y02P70/50
Inventor 周勇吕敬双
Owner SHENZHEN HONGTAI BATTERY TECH
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