High-voltage and high-volumetric-energy-density long-life lithium ion battery and preparation method thereof

A lithium-ion battery and energy density technology, applied in the field of lithium-ion batteries, can solve problems such as the inability to guarantee the service life of digital products, the increase of lithium-ion diffusion resistance, and the deviation of battery cycle life, so as to expand market application prospects and major production practices Significance, the effect of increasing energy density

Active Publication Date: 2016-12-21
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the oxidative decomposition of the electrolyte under high voltage, as well as the structural stability of the positive electrode material and the dissolution of the active material under high voltage, as the charging voltage increases, the cycle performance of the battery decreases significantly, and the increase in volumetric energy density is often accompanied by With the improvement of the coating surface density and compaction density of positive and negative electrodes, the diffusion resistance of lithium ions increases, so the cycle life of high energy density lithium ion batteries deviates, and the service life of digital products cannot be guaranteed

Method used

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  • High-voltage and high-volumetric-energy-density long-life lithium ion battery and preparation method thereof
  • High-voltage and high-volumetric-energy-density long-life lithium ion battery and preparation method thereof
  • High-voltage and high-volumetric-energy-density long-life lithium ion battery and preparation method thereof

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Embodiment 1

[0046] (1) Preparation of the positive electrode sheet: modify the positive active material 4.4V lithium cobaltate, the positive electrode conductive agent carbon nanotubes (CNTs), and the positive electrode binder polyvinylidene fluoride (PVDF) according to the mass percentage of 98.5% and 0.5% respectively , 1.0% mixed with the solvent N-methylpyrrolidone (NMP) to make a positive electrode slurry, and then coated on a double-sided aluminum foil with a thickness of 10 μm and a material of 1235, and the surface density of the coating was 41.4mg / cm 2 , after coating, carry out roll pressing to make positive electrode sheet for later use, the compacted density is 4.15g / cm 3 ;

[0047] (2) Preparation of negative electrode sheet: Negative electrode active material artificial graphite, negative electrode conductive agent conductive carbon black Super P, negative electrode binder sodium carboxymethyl cellulose (CMC) and styrene-butadiene rubber (SBR) are respectively according to t...

Embodiment 2

[0067] (1) Preparation of the positive electrode sheet: modify the positive active material 4.4V lithium cobaltate, the positive electrode conductive agent carbon nanotubes (CNTs), and the positive electrode binder polyvinylidene fluoride (PVDF) according to the mass percentage of 97.7% and 0.8% respectively , 1.5% mixed with the solvent N-methylpyrrolidone (NMP) to make a positive electrode slurry, and then coated on a double-sided aluminum foil with a thickness of 10 μm and a material of 1235, and the surface density of the coating is 40.4mg / cm 2 , after coating, carry out roll pressing to make positive electrode sheet for later use, the compacted density is 4.2g / cm 3 ;

[0068] (2) Preparation of negative electrode sheet: artificial graphite and natural graphite are mixed with a weight ratio of 1:1 to obtain a negative active material, and then the negative active material, negative electrode conductive agent conductive carbon black Super P, negative electrode binder carbox...

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Abstract

The invention provides a high-voltage and high-volumetric-energy-density long-life lithium ion battery and a preparation method thereof. The battery comprises a lithium ion battery outer shell aluminum-plastic packaging film, a positive electrode piece, a negative electrode piece, an isolation film, an electrolyte, and positive and negative electrode lugs, wherein the positive electrode piece uses carbon nanotubes (CNTs) as a conductive agent, and the isolation film comprises a polyolefin isolation film base and a mixed coating of Al2O3 and polyvinylidene fluoride (PVDF); the surface of the polyolefin isolation film base is coated with the mixture of Al2O3 and polyvinylidene fluoride (PVDF). The high-voltage and high-volumetric-energy-density long-life lithium ion battery provided by the invention not only has volumetric energy density of greater than or equal to 700Wh / L, but also has good electrochemical performance and safety performance, has outstanding cycle performance, and has a cycle life of 800 times and a capacity retention rate of 80% or above at normal temperature.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a high-voltage, high-volume, energy-density, long-life lithium-ion battery and a preparation method thereof. Background technique [0002] With the rapid development of the digital industry, in order to reduce the product system, non-detachable mobile phones and notebook computers have emerged. Users of such digital products cannot replace lithium-ion batteries by themselves. Therefore, it is necessary to improve the cycle life of lithium-ion batteries to ensure product reliability. The life cycle meets the requirements. [0003] There are many ways to increase the energy density of batteries, such as selecting high-capacity positive and negative electrode materials, selecting thinner auxiliary materials, and increasing the charging voltage. Among them, increasing the charging voltage is one of the effective ways to increase the volumetric energy density of lithium-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M4/62H01M10/0525H01M10/058H01M50/409
CPCH01M4/625H01M10/0525H01M10/058H01M50/409Y02E60/10Y02P70/50
Inventor 李文文王立仕王驰伟
Owner TIANJIN ENERGIES
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