Electrode plate and lithium ion battery comprising same

An electrode sheet and negative electrode technology, applied in secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of battery thermal runaway, difficult safety problems, etc., achieve high elongation, ensure battery electrical performance, and avoid regional area Effect

Pending Publication Date: 2022-02-25
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to this pole piece surface coating technology, the electrolyte is still a liquid system. Under the condition of overheating of the battery, the active material directly contacts the electrolyte, and a series of side reactions will occur, releasing a large amount of heat and causing the battery to appear completely. thermal runaway
It can be seen that it is difficult to solve the safety problems of battery acupuncture and overheating at the same time by adopting a single technical method

Method used

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  • Electrode plate and lithium ion battery comprising same
  • Electrode plate and lithium ion battery comprising same
  • Electrode plate and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 1. Preparation of positive electrode sheet containing in-situ solidified electrolyte and functional coating:

[0063] 1) Mix NCM high-nickel 8-series positive electrode (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 97:1.5:1.5 to make positive electrode slurry Material, the positive electrode slurry is coated on both surfaces of the current collector aluminum foil, dried at 100°C to form a positive electrode active material layer, and then cold pressed to obtain a positive electrode sheet containing an active material layer;

[0064] 2) Mix polyethylene glycol diacrylate, polyarylene oxadiazole, azobisisobutyronitrile, and commercial electrolyte in a mass ratio of 3:1:0.03:95.97 to obtain a uniform precursor solution, and then use The way of spraying is to make the positive electrode sheet containing the active material layer prepared in step 1) completely soak the abo...

Embodiment 2

[0074] 1. Preparation of positive electrode sheet containing in-situ solidified electrolyte and functional coating:

[0075] 1) Mix NCM high-nickel 8-series positive electrode (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 97:1.5:1.5 to make positive electrode slurry Material, the positive electrode slurry is coated on both surfaces of the current collector aluminum foil, dried at 100°C to form a positive electrode active material layer, and then cold pressed to obtain a positive electrode sheet containing an active material layer;

[0076] 2) Trimethylolpropane triacrylate, polyarylene oxadiazole, azobisisobutyronitrile, and commercial electrolyte are uniformly mixed in a mass ratio of 3:1:0.03:95.97 to obtain a uniform precursor solution, and then By spraying, the positive electrode sheet containing the active material layer prepared in step 1) is completely soaked in the a...

Embodiment 3

[0085] 1. Preparation of positive electrode sheet containing in-situ solidified electrolyte and functional coating:

[0086] 1) Mix NCM8 positive electrode (positive electrode active material), conductive agent superconducting carbon (Super-P), and binder polyvinylidene fluoride (PVDF) at a mass ratio of 97:1.5:1.5 to make positive electrode slurry. The positive electrode slurry is coated on both surfaces of the current collector aluminum foil, dried at 100°C to form a positive electrode active material layer, and then cold pressed to obtain a positive electrode sheet containing an active material layer;

[0087] 2) Evenly mix trimethylolpropane triacrylate, azobisisobutyronitrile, and commercial electrolyte in a mass ratio of 3:0.03:96.97 to obtain a uniform precursor solution, and then spray to make step 1 ) The positive electrode sheet containing the active material layer is completely infiltrated with the precursor solution, heated at 80° C. to solidify the precursor solut...

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Abstract

The invention provides an electrode plate and a lithium ion battery comprising the same. The electrode plate comprises a current collector, an active substance layer, an electrolyte and a functional coating; the current collector is provided with two opposite surfaces; the active substance layer is arranged on at least one surface of the current collector; the electrolyte is arranged inside and / or on the surface of the active substance layer; the functional coating layer is disposed on an active material layer including an electrolyte. By constructing the in-situ curing electrolyte and the functional coating, the influence of a single functional coating mode on the increase of the internal resistance of the battery can be reduced while the needling and heating safety of the battery is improved, and the electrical property of the battery is ensured.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrode sheet and a lithium ion battery prepared by including the electrode sheet. Background technique [0002] At present, the development of lithium-ion batteries is mainly moving towards high energy density and ultra-fast charging technology, such as the application of high-nickel ternary, silicon-carbon anode and other materials, which greatly deteriorates the intrinsic safety of the battery, and the abuse under various conditions , such as overcharge, overheating, impact and other external uncontrollable factors, battery safety accidents occur frequently, so it is very necessary to improve battery safety. [0003] There are many ways to improve battery safety, such as diaphragm coating modification, high temperature resistant diaphragm, polymer composite current collector, use of flame retardant additives in electrolyte, and coating of positiv...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/131H01M4/133H01M4/134H01M4/139H01M4/1391H01M4/1393H01M4/1395H01M10/0525H01M10/0565H01M10/42H01M50/586H01M50/59
CPCH01M4/131H01M4/133H01M4/134H01M4/1391H01M4/13H01M4/139H01M4/1393H01M4/1395H01M10/0565H01M10/0525H01M10/4235H01M50/586H01M50/59H01M2300/0085H01M2300/0091Y02E60/10
Inventor 赵伟李素丽张赵帅唐伟超董德锐
Owner ZHUHAI COSMX BATTERY CO LTD
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