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Electrode with insulation coating, manufacturing method of electrode and lithium battery comprising electrode

An insulating coating and lithium-ion battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of low capacity density, working potential limit battery specific capacity, voltage hysteresis, etc., to achieve high safety performance, avoiding exothermic effects, and high rate charge and discharge performance

Inactive Publication Date: 2014-12-24
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fact that graphite materials are easy to precipitate lithium dendrites during charging and discharging, the initial charging and discharging efficiency is low, interacting with the electrolyte, and there are unfavorable factors such as voltage hysteresis
Compared with graphite, lithium titanate material has better safety, high rate charge and discharge ability, especially its cycle performance is very good, but its high working potential limits the specific capacity of the battery
Judging from the current electric vehicle batteries, in order to balance capacity and safety, there are mainly three types of batteries, one is LiMPO with olivine structure 4 (M is selected from Co, Ni and Mn) compound as the positive electrode material, graphite as the negative electrode material, this type of battery has better safety, but there are certain defects in the energy density and low temperature environment; the other is the transition metal layered oxidation LiM (M is selected from Co, Ni and Mn) O 2 The material is the positive electrode material, and lithium titanate is the negative electrode material. This kind of battery has good cycle ability and high rate charge and discharge, but the capacity density is low; the third is the transition metal layered oxide LiM (M is selected from Co , Ni and Mn)O 2 The material is the positive electrode material, and graphite is the negative electrode material to match it. This type of battery has a higher capacity density and better battery cycle performance, but the safety needs to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1-1. Production of positive electrode

[0028] Dissolve 5% of the total mass of PVDF in N-methyl-2-pyrrolidone, fully stir to form a uniform solution of PVDF, and then add 94% of the total mass of the ternary cathode material (LiMO 2 (M is Mn, Co and Ni)), 1% conductive carbon black was added to the above PVDF solution to prepare positive electrode slurry. The positive electrode slurry is coated, and the coated electrode sheet is dried and rolled.

[0029] 1-2. Fabrication of negative electrode with insulating layer

[0030] The PVDF that accounts for 4% of the total mass is dissolved in a certain amount of N-methyl-2-pyrrolidone, fully stirred to form a uniform solution of PVDF, and then the graphite that accounts for 94% of the total mass and the conductive carbon black that accounts for 2% of the total mass Add it into the above PVDF solution to prepare negative electrode slurry. The negative electrode slurry is coated, and the coated electrode sheet is dried and ...

Embodiment 2

[0034] 2-1. Production of positive electrode

[0035] Dissolve 5% of the total mass of PVDF in N-methyl-2-pyrrolidone, fully stir to form a uniform solution of PVDF, and then add 94% of the total mass of the ternary cathode material (LiMO 2 (M is Mn, Co and Ni)), 1% conductive carbon black was added to the above PVDF solution to prepare positive electrode slurry. The positive electrode slurry is coated, and the coated electrode sheet is dried and rolled.

[0036] 2-2. Fabrication of negative electrode with insulating layer

[0037] The PVDF that accounts for 4% of the total mass is dissolved in a certain amount of N-methyl-2-pyrrolidone, fully stirred to form a uniform solution of PVDF, and then the graphite that accounts for 94% of the total mass and the conductive carbon black that accounts for 2% of the total mass Add it into the above PVDF solution to prepare negative electrode slurry. The negative electrode slurry is coated, and the coated electrode sheet is dried and ...

Embodiment 3

[0042] Other steps are the same as in Example 2, and the negative electrode manufacturing steps with insulating layer are as follows: 8gLi 3 PO 4 , 12g SiS 2 and 4gP 2 S 5 Add it into 600g of tetrahydrofuran in an argon atmosphere, and disperse by ball milling. The negative electrode prepared above was dipped in the slurry and dried, and the thickness of the insulating layer on the negative electrode was about 10 μm. Then assemble into a battery in an inert atmosphere.

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Abstract

The invention provides a negative electrode for a lithium ion battery. The negative electrode comprises a negative electrode current collector, a negative electrode active material coating which is connected to the negative electrode current collector and an insulation coating which is arranged on the negative electrode active material coating, wherein the insulation coating comprises a glass material with a capacity of guiding the lithium ions. The invention also provides a preparation method of the negative electrode and a lithium battery comprising the negative electrode. The lithium battery has high-rate charging and discharging performance and high safety and is applicable to the field of electric cars.

Description

technical field [0001] The invention relates to an electrode with an insulating coating for a lithium-ion secondary battery, a manufacturing method thereof, and a lithium battery containing the electrode. Background technique [0002] Due to its excellent performance, secondary lithium-ion batteries are more and more widely used in electronic products, backup power supplies, and electric vehicles. With the continuous improvement of application requirements, lithium-ion battery products are constantly being updated. During the use of lithium batteries, the safety of batteries is always an issue that must be considered, especially at present, the capacity of lithium-ion batteries is getting higher and higher, and the current during use is getting larger and larger, so battery safety has become a primary issue. [0003] Since Sony Corporation of Japan first successfully launched commercialized lithium-ion batteries in the 1990s, lithium-ion batteries have entered a rapid develo...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/62H01M10/0525Y02E60/10
Inventor 周小平罗建海
Owner MICROVAST POWER SYST CO LTD
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