A kind of high voltage high volume energy density long life lithium ion battery and its preparation method

A lithium-ion battery, energy density technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve problems such as the inability to guarantee the service life of digital products, the increase in lithium ion diffusion resistance, and the decline in battery cycle performance. To achieve the effect of expanding market application prospects, significant production practice significance, and energy density improvement

Active Publication Date: 2019-03-01
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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  • A kind of high voltage high volume energy density long life lithium ion battery and its preparation method
  • A kind of high voltage high volume energy density long life lithium ion battery and its preparation method
  • A kind of high voltage high volume energy density long life lithium ion battery and its preparation method

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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, high-volume, energy-density, long-life lithium-ion battery and a preparation method thereof. The battery comprises an aluminum-plastic packaging film for an external shell of the lithium-ion battery, a positive pole piece, a negative pole piece, a separator, an electrolyte, Positive and negative tabs; the conductive agent used in the positive pole piece is carbon nanotubes (CNTs), and the isolation film includes polyolefin isolation film substrate and Al 2 o 3 and polyvinylidene fluoride (PVDF) mixed coating, the surface of the polyolefin isolation film substrate is coated with Al 2 o 3 and polyvinylidene fluoride (PVDF) mixture. The high-voltage, high-volume energy-density and long-life lithium-ion battery of the present invention not only satisfies volume energy density ≥ 700Wh / L, but also has good electrochemical performance and safety performance, outstanding cycle performance, and a normal temperature life of up to 800 cycles of capacity retention. Above 80%.

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 Patents(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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