Composite system power battery with high safety and long service life and preparation method of composite system power battery

A composite material and power battery technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor high temperature cycle performance, safety and security, and achieve high electrical conductivity, improved safety performance, and improved cycle performance.

Inactive Publication Date: 2017-01-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Driven by the goal of achieving a battery module energy density of 300Wh / kg in 2020, high-nickel ternary materials have become a hot spot in research and development. However, domestic high-nickel ternary batteries have disadvantages such as unsafety during use and poor high-temperature cycle performance. At the beginning of 2016, the Ministry of Industry and Information Technology promulgated the suspension of the use of ternary material power lithium-ion batteries in commercial vehicles, which caused an uproar among ternary lithium-ion battery companies. As a leading company in power lithium-ion batteries, our company took the lead in increasing the use of ternary lithium-ion batteries. Research and development of ion battery safety performance

Method used

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  • Composite system power battery with high safety and long service life and preparation method of composite system power battery
  • Composite system power battery with high safety and long service life and preparation method of composite system power battery
  • Composite system power battery with high safety and long service life and preparation method of composite system power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, the coating diaphragm is used as the base material of 14 μm PE, 4 μm Al 2 o 3 Coating (i.e. 14+4).

[0031] 1) Using NMP as a solvent, after completely dissolving PVDF, adding carbon nanotubes to disperse at high speed, and then mixing in composite positive electrode active material (LiNi 0.6 co 0.2 mn 0.2 o 2 :LiMn 0.8 Fe 0.2 PO 4 =8:2), after fully mixing the slurry, use a coating machine to evenly coat it on the aluminum foil, after drying, rolling, and slitting, it is made into a positive electrode sheet, PVP 1-2%, PVDF 1-3.5%, nano Carbon tube 1~3.5%, slurry viscosity: 6000~9000mPa.S, positive electrode coating surface density 370kg / m 2 , the edge of the slurry is coated with 2mm Al 2 o 3 ceramic colloid. The negative electrode uses deionized water as a solvent. After completely dispersing CMC, it is mixed with acetylene black and negative electrode active material artificial graphite, and finally mixed with SBR to make pulp, and then co...

Embodiment 2

[0034] In this example, the coated diaphragm is used as the base material of 12 μm PE, 4 μm Al 2 o 3 And 2μm PVDF coating (ie 12+4+2).

[0035]1) Using NMP as a solvent, after completely dissolving PVDF, adding carbon nanotubes to disperse at high speed, and then mixing in composite positive electrode active material (LiNi 0.6 co 0.2 mn 0.2 o 2 :LiMn 0.8 Fe 0.2 PO 4 =8:2), after fully mixing the slurry, use a coating machine to evenly coat it on the aluminum foil, after drying, rolling, and slitting, it is made into a positive electrode sheet, PVP 1-2%, PVDF 1-3.5%, nano Carbon tube 1~3.5%, slurry viscosity: 6000~9000mPa.S, positive electrode coating surface density 370kg / m 2 , the edge of the slurry is coated with 2mm Al 2 o 3 ceramic colloid. The negative electrode uses deionized water as a solvent. After completely dispersing CMC, it is mixed with acetylene black and negative electrode active material artificial graphite, and finally mixed with SBR to make pulp, ...

Embodiment 3

[0038] In this example, the coated diaphragm is used as the base material of 12 μm PE, 4 μm Al 2 o 3 And 1μm PVDF coating on both sides (ie 12+4+1+1).

[0039] 1) Using NMP as a solvent, after completely dissolving PVDF, adding carbon nanotubes to disperse at high speed, and then mixing in composite positive electrode active material (LiNi 0.6 co 0.2 mn 0.2 o 2 :LiMn 0.8 Fe 0.2 PO 4 =8:2), after fully mixing the slurry, use a coating machine to evenly coat it on the aluminum foil, after drying, rolling, and slitting, it is made into a positive electrode sheet, PVP 1-2%, PVDF 1-3.5%, nano Carbon tube 1~3.5%, slurry viscosity: 6000~9000mPa.S, positive electrode coating surface density 370kg / m 2 , the edge of the slurry is coated with 2mm Al 2 o 3 ceramic colloid. The negative electrode uses deionized water as a solvent. After completely dispersing CMC, it is mixed with acetylene black and negative electrode active material artificial graphite, and finally mixed with S...

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Abstract

The invention relates to the field of research, development and preparation of lithium batteries, in particular to a composite system power battery with high safety and long service life and a preparation method of the composite system power battery. The preparation method of the power battery comprises steps as follows: 70%-90% of LiNi0.6Co0.2Mn0.2O2 and 10%-30% of LiMn0.8Fe0.2PO4 are mixed, sufficient mixing and pulp preparation are performed in cooperation of high-conductivity carbon nanotubes, then, pulp is subjected to coating, rolling and slitting, and a positive plate is prepared; as for a negative electrode, synthetic graphite is mixed with acetylene black, sufficient mixing and pulp preparation are performed, pulp is subjected to coating, rolling and slitting, and a negative plate is prepared; cells are prepared according to the desired size from diaphragms by the aid of a wet-method polyethylene substrate, an aluminum oxide ceramic coating and a binder PVDF, then, liquidation ingredients are injected, the battery is prepared, and used electrolyte adopts a high-molar-concentration mixed solvent system of multiple compound additives. The retention rate of the prepared battery reaches 88% after 1,200 cycles of cycling at the normal temperature and reaches 87% after 680 cycles of cycling at the high temperature of 45 DEG C, and the battery has excellent heat stability, energy density, normal-temperature and high-temperature cycling performance and excellent safety and can be widely used for electric automobiles and related products.

Description

technical field [0001] The invention relates to the field of research and development and preparation of lithium batteries, in particular to a high-safety and long-life composite material system power battery and a preparation method thereof. Background technique [0002] Driven by the goal of achieving a battery module energy density of 300Wh / kg in 2020, high-nickel ternary materials have become a hot spot in research and development. However, domestic high-nickel ternary batteries have disadvantages such as unsafety during use and poor high-temperature cycle performance. At the beginning of 2016, the Ministry of Industry and Information Technology promulgated the suspension of the use of ternary material power lithium-ion batteries in commercial vehicles, which caused an uproar among ternary lithium-ion battery companies. As a leading company in power lithium-ion batteries, our company took the lead in increasing the use of ternary lithium-ion batteries. Research and devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/60H01M4/62H01M10/0525H01M10/42C01B31/02
CPCH01M4/505H01M4/525H01M4/602H01M4/624H01M4/625H01M10/0525H01M10/4235H01M2220/20Y02E60/10
Inventor 王光俊吴小兰陈炜张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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