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Safe high-voltage high-energy-density lithium ion battery and preparation method thereof

A lithium-ion battery, high energy density technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems of inferior capacity and cycle performance, low first-time efficiency, poor safety and stability of high nickel, etc., to achieve guaranteed Effects of cycle stability, improved stability, and good performance

Inactive Publication Date: 2019-05-14
桑顿新能源科技(长沙)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, there are two main ways to improve energy density: the high-nickel system and the high-voltage system. The high-nickel system is paired with silicon-carbon anodes. Due to the large expansion of silicon-carbon, the initial efficiency is low, resulting in disadvantages in capacity and cycle performance, and high nickel is safe. The stability is poor, so the high-nickel route needs further research

Method used

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  • Safe high-voltage high-energy-density lithium ion battery and preparation method thereof
  • Safe high-voltage high-energy-density lithium ion battery and preparation method thereof
  • Safe high-voltage high-energy-density lithium ion battery and preparation method thereof

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Embodiment 1

[0029] Step S1: Positive electrode sheet preparation

[0030] Dissolve 1.6% polytetrafluoroethylene in N-methylpyrrolidone to form a 6.5% uniformly mixed glue, then add 1.2% conductive carbon black and 0.7% carbon nanotubes, stir for 2 hours, mix well, and then add 30% titanium oxide A mixture of coated single crystal NCM523 (particle size 6 μm) and 66.5% titanium oxide coated single crystal NCM622 (particle size 4 μm) was stirred for 4 hours to obtain positive electrode slurry.

[0031] The above positive electrode slurry was evenly coated on a 12 μm aluminum foil, baked and rolled (compaction density 3.6g / cm 3 ), die-cut to obtain the required positive pole piece.

[0032] Step S2: Negative electrode sheet preparation

[0033] Dissolve 1.2% sodium carboxymethyl cellulose in deionized water to obtain a glue solution with a solid content of 1.3%, add 1.2% conductive carbon black, 95.1% artificial graphite, and 2.5% styrene-butadiene rubber in sequence to obtain the negative ...

Embodiment 2

[0038] Step S1: Positive electrode sheet preparation

[0039] Dissolve 1.6% polytetrafluoroethylene in N-methylpyrrolidone to form a 6.5% uniformly mixed glue, then add 1.2% conductive carbon black and 0.7% carbon nanotubes, stir for 2 hours, mix well, and then add 30% titanium oxide A mixture of coated single crystal NCM523 (particle size 6 μm) and 66.5% titanium oxide coated single crystal NCM622 (particle size 4 μm) was stirred for 4 hours to obtain positive electrode slurry.

[0040] The above positive electrode slurry was evenly coated on a 12 μm aluminum foil, baked and rolled (compaction density 3.6g / cm 3 ), die-cut to obtain the required positive pole piece.

[0041] Step S2: Negative electrode sheet preparation

[0042] Dissolve 1.2% sodium carboxymethyl cellulose in deionized water to obtain a glue solution with a solid content of 1.3%, add 1.2% conductive carbon black, 95.1% artificial graphite, and 2.5% styrene-butadiene rubber in sequence to obtain the negative ...

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Abstract

The invention discloses a safe high-voltage high-energy-density lithium ion battery and a preparation method thereof. The safe high-voltage high-energy-density lithium ion battery comprises a positiveplate, a negative plate, an electrolyte and a diaphragm; the positive plate comprises an aluminum foil current collector and a positive active material coating, the positive active material is a single crystal nickel cobalt lithium manganate mixture coated with titanium oxide according to a certain ratio, the negative plate comprises a copper foil current collector, a negative active material coating and a ceramic coating, the negative active material coating is coated with the ceramic coating, wherein the positive active material is one or two of single crystal NCM523 and single crystal NCM622 after being subjected to titanium oxide coating treatment, the negative active material is a high-capacity graphite material, the electrolyte is a high-voltage electrolyte, and the voltage range is4.0-6.0V. According to the lithium ion battery prepared by utilizing the material, the battery energy density is improved, and good safety performance is achieved while the battery has excellent cycling performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a safe high-voltage, high-energy-density lithium-ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are favored by various countries due to their advantages such as high energy density, low self-discharge rate, long cycle life, clean and pollution-free. However, the energy density, cycle life, and safety performance in practical applications still cannot meet the requirements. In this context, high energy density systems, high capacity cathode materials, high cycle performance, and high safety performance have become the research hotspots of lithium-ion batteries. [0003] At present, there are two main ways to improve energy density: the high-nickel system and the high-voltage system. The high-nickel system is paired with silicon-carbon anodes. Due to the large expansion of silicon-carbon, the initial effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 伍成李文武周游胡阳鹏王耐清李小兵
Owner 桑顿新能源科技(长沙)有限公司
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