Low-temperature type lithium ion battery with high voltage and high volume energy density

A lithium-ion battery and energy density technology, applied in the field of lithium-ion batteries, can solve the problems of increased lithium-ion diffusion resistance, poor low-temperature performance of lithium-ion batteries, and reduced safety performance and cycle performance.

Inactive Publication Date: 2016-04-06
TIANJIN ENERGIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the charging voltage increases, the safety performance and cycle performance of lithium-ion batteries decline. At the same time, the increase in volumetric energy density is often accompanied by the increase in the coating surface density and compaction density of the positive and negati

Method used

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  • Low-temperature type lithium ion battery with high voltage and high volume energy density
  • Low-temperature type lithium ion battery with high voltage and high volume energy density
  • Low-temperature type lithium ion battery with high voltage and high volume energy density

Examples

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Example Embodiment

[0038] Example 1

[0039]a. Preparation of positive electrode sheet: 4.35V modified lithium cobaltate, conductive carbon black and polyvinylidene fluoride (PVDF) are mixed with solvent nitrogen methyl pyrrolidone (NMP) according to the mass percentage of 96.5::1.5:2. Positive electrode slurry, coated on a double-sided glossy aluminum foil with a thickness of 12 μm and a material of 1060, with a coating surface density of 40.2 mg / cm 2 , after coating, carry out roll pressing to make a positive electrode sheet for later use, and the compacted density is 4.2g / cm 3 ;

[0040] b. Preparation of negative electrode sheet: natural graphite and artificial graphite are mixed into a negative electrode active material according to a mass ratio of 1:1, and then the negative electrode active material, conductive carbon black and polyvinylidene fluoride (PVDF) are 96% by mass : The ratio of 1:3 is mixed with the solvent nitrogen methyl pyrrolidone (NMP) to make negative electrode slurry, w...

Example Embodiment

[0044] Example 2

[0045] a. Preparation of positive electrode sheet: 4.40V lithium cobaltate, conductive carbon nanotubes (CNTS) and polyvinylidene fluoride (PVDF) are mixed with solvent nitrogen methyl pyrrolidone (NMP) according to the ratio of mass percentage of 97.5:1:1.5 Make a positive electrode slurry, and coat it on a double-sided aluminum foil with a thickness of 12 μm and a material of 1060, and the coating surface density is 42.4 mg / cm 2 , after coating, carry out roll pressing to make a positive electrode sheet for later use, and the compacted density is 4.2g / cm 3 ;

[0046] b. Preparation of negative electrode sheet: natural graphite and artificial graphite are mixed into a negative electrode active material according to a mass ratio of 1:1, and then the negative electrode active material, conductive carbon black and polyvinylidene fluoride (PVDF) are 96.5% by mass : The ratio of 0.5:3 is mixed with the solvent nitrogen methyl pyrrolidone (NMP) to make negative...

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Abstract

The invention provides a low-temperature type lithium ion battery with high voltage and high volume energy density. The low-temperature type lithium ion battery comprises a cathode, an anode, an isolating membrane and an electrolyte solution, wherein the isolating membrane is formed by coating polyvinylidene fluoride-hexafluoropropylene copolymer coatings on both sides of a polyolefin isolating membrane substrate. According to the low-temperature type lithium ion battery with high voltage and high volume energy density provided by the invention, the polyvinylidene fluoride-hexafluoropropylene copolymer coated on the surfaces of the isolating membrane can polymerize with polyvinylidene fluoride in positive and negative pole pieces, so that the cathode and the anode are tightly attached with the isolating membrane together, the expansion of the cathode and the anode is reduced, the inner volume of the battery is further reduced, and the energy density is improved; moreover, the polyvinylidene fluoride on the surfaces of the isolating membrane has good electrolyte retention, and is matched with the low-temperature type lithium ion electrolyte solution and good cathode and anode space conducting network, so that lithium ions can be relatively high in diffusion and disembedding speed between the electrolyte solution and the cathode and the anode under low temperature, and the discharging capacity of greater than or equal to 90% at -20 DEG C can be realized.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a high-voltage, high-volume, energy-density, low-temperature lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in people's daily life. With the development of wearable devices and portable electronic devices in the direction of thinner and more The standby time in winter or low temperature environment has higher and higher requirements for lithium-ion batteries. [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-ion batteries. However, as the charging voltage increases, the safety performance and cycle performance of lithium-ion batteries dec...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M2/16H01M10/058H01M10/0525H01M50/417H01M50/449
CPCH01M4/623H01M10/0525H01M10/058H01M50/411Y02E60/10Y02P70/50
Inventor 李文文郑彦俊王立仕王驰伟
Owner TIANJIN ENERGIES
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