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Electronic insulator refractory material and application thereof in high-safety lithium ion battery

A lithium-ion battery and refractory technology, applied in the field of materials, can solve problems such as hidden safety hazards, difficult to withstand high temperature environments, and no performance advantages, and achieve the effects of good shape, balanced heat production, and prevention of positive and negative short circuits.

Pending Publication Date: 2022-04-05
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of materials, the melting point range of commercial polyolefin organic separators on the market is between 135°C and 165°C, which makes it difficult to withstand high temperature environments.
Considering the process, traditional single-draw oriented separators usually have high strength only in one direction, while double-drawn oriented separators have relatively high strength in both machine direction (MD) and transverse direction (TD), but the actual In fact, double-drawn oriented separators provide virtually no performance advantage, and double-drawn oriented separators tend to introduce TD shrinkage, which can cause positive and negative electrodes to contact each other at elevated temperatures, causing safety hazards (Pankaj Arora and Zhengming (John ) Zhang.BatterySeparators.Chem.Rev.2004,104,4419-4462)

Method used

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  • Electronic insulator refractory material and application thereof in high-safety lithium ion battery
  • Electronic insulator refractory material and application thereof in high-safety lithium ion battery
  • Electronic insulator refractory material and application thereof in high-safety lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The manufacturing process of the positive pole sheet of the lithium-ion battery with a safe double-coated structure provided by the invention is as follows:

[0042] After mechanically mixing the positive electrode active material ternary material NCM622, the electronic conductivity agent SuperC65, and the binder polyvinylidene fluoride at a mass ratio of 96:2:2 for 45 minutes, add an appropriate amount of solvent N-methylpyrrolidone, and continue stirring for 4 hours to obtain a solid A positive electrode slurry with a content of 70%, which is coated on a 16 μm aluminum foil current collector by extrusion coating, then dried in a blast oven at 70°C, and mechanically rolled to obtain a positive electrode sheet.

[0043] On the surface of the positive electrode sheet, evenly coat a layer of 25 μm lithium titanium aluminum phosphate Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 The slurry (the solvent is N-methylpyrrolidone), the thickness of lithium titanium aluminum phosphate coat...

Embodiment 2

[0047] The manufacturing process of the negative pole sheet of the lithium ion battery with safe double-coated structure provided by the invention is as follows:

[0048] After mechanically mixing the negative electrode active material graphite, electronic conductive agent SuperC65, binder sodium carboxymethyl cellulose, and polystyrene butadiene copolymer according to the mass ratio of 95:1.3:1.2:2.5 for 45 minutes, add an appropriate amount of solvent deionized water , and continued to stir for 3 hours to obtain a negative electrode slurry with a solid content of 55%. The slurry was coated on a 6 μm copper foil current collector by extrusion coating, then dried in a blast oven at 100 ° C, and mechanically rolled to obtain Negative electrode sheet.

[0049] A layer of 25 μm nano-alumina-containing slurry (the solvent is dimethyl sulfoxide) was evenly coated on the surface of the negative electrode sheet, and the thickness of the nano-alumina coating was 10 μm after mechanical...

Embodiment 3

[0053] The manufacturing process of the negative pole sheet of the lithium ion battery with safe double-coated structure provided by the invention is as follows:

[0054] After mechanically mixing the negative electrode active material graphite, electronic conductive agent Super C65, and binder PVDF according to the mass ratio of 95:3:2 for 45 minutes, add an appropriate amount of solvent N-methylpyrrolidone, and continue stirring for 3 hours to obtain a negative electrode with a solid content of 45%. Slurry, the slurry is coated on an 8 μm copper foil current collector by extrusion coating, then dried in a blast oven at 65° C., and mechanically rolled to obtain a negative electrode sheet.

[0055] On the surface of the negative electrode sheet, evenly coat a layer of 15 μm containing Li 7 La 3 Zr 2 o 12 The slurry (the solvent is ethylene carbonate), after mechanical rolling, Li 7 La 3 Zr 2 o 12 The coating thickness is 5 μm.

[0056]Thus, a positive electrode sheet w...

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Abstract

The invention relates to an electronic insulator refractory material and application thereof in a high-safety lithium ion battery. The lithium ion battery comprises a positive electrode, a diaphragm and a negative electrode, the surface of the pole piece of the positive electrode and / or the surface of the pole piece of the negative electrode are / is provided with a coating containing an electronic insulator refractory material, and / or the surface of the diaphragm is provided with a thin film formed by the coating containing the electronic insulator refractory material; the electronic insulator refractory material comprises at least one of aluminum oxide, silicon dioxide, zinc oxide, boehmite, a fast ion conductor Li < 5 > La < 3 > M < 12 > O < 12 >, Li < 7 > La < 3 > M < 12 > O < 12 >, Li < 1 + x > Al < x > M < 22-x > (PO4) < 3 >, Li < 10 > M < 3 > P < 2 > S < 12 >, Li < 6 > PS < 5 > Cl, Li < 9.54 > Si < 1.74 > P < 1.44 > S < 11.7 > Cl < 0.3 >, Li < 3.25 > Ge < 0.25 > P < 0.75 > S < 4 >, Li < 3 > P < 4 > S < 4 >, Li < 6 > Al < 1 > La < 2 > M < 5 > O < 12 >, Li < 5.5 > La < 3 > M

Description

technical field [0001] The invention relates to the technical field of materials, in particular to an electronic insulator refractory material and its application in high-safety lithium-ion batteries. Background technique [0002] Overall battery technology advancements over the past 150 years have primarily driven improvements in energy density, from lead-acid batteries in the 1850s, nickel-cadmium batteries in the 1890s, and nickel-metal hydride batteries in the 1960s all the way to today’s lithium-ion batteries. In the current era of lithium-ion batteries, the global electric vehicle market is growing rapidly, and people's demand for higher energy density, safer battery performance and longer driving range of electric vehicles is constantly increasing. With the frequent occurrence of thermal runaway accidents in portable electronic products and electric vehicles, safer lithium-ion batteries have become the most urgent demand in the industry. Based on market trends, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M50/449H01M10/0525
Inventor 苑克国葛志浩马德正何华俊
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD