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A high dielectric battery separator

A battery diaphragm and high dielectric technology, applied in the field of membrane materials, can solve the problem that the ionic conductivity of the electrolyte is not improved, and achieve the effects of enhancing the retention rate, improving the overall performance, and improving the ion dissociation effect

Active Publication Date: 2015-09-16
山东鲁顺宏泰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has no effect on the ionic conductivity of the electrolyte

Method used

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  • A high dielectric battery separator
  • A high dielectric battery separator
  • A high dielectric battery separator

Examples

Experimental program
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Embodiment 1

[0024] This embodiment describes that the first layer and the third layer of film are PP-PE porous composite membranes for conventional lithium batteries, and the second layer of film is BaTiO 3 Separator composed of particles for Li-LiMn 2 o 4 condition of the battery.

[0025] 1) Add 0.90g BaTiO 3 Dissolve in 5mL N-methylpyrrolidone, and oscillate ultrasonically for 30 minutes to disperse evenly;

[0026] 2) Evenly coat the dispersion on the PP-PE base film for conventional lithium batteries, with a coating thickness of 50 μm;

[0027] 3) Then cover another layer of PP-PE base film for conventional lithium batteries;

[0028] 4) Put it in a vacuum oven and bake at 80°C for 12 hours to obtain a sandwich composite film a.

[0029] The above-mentioned interlayer composite film a and conventional lithium battery PP-PE film were assembled into a model battery system: conventional stainless steel electrode / diaphragm + electrolyte (1M LiPF 6 / EC+EMC+DMC) / conventional stainles...

Embodiment 2

[0042] This example describes that the first layer of film is a PP-PE composite porous film for conventional lithium batteries, the second layer of film is a strontium titanate film, and the third layer of film is a polyvinylidene fluoride PVDF film (prepared by the following step 2 ), forming the separator, for graphite-LiCoO 2 The situation in lithium-ion batteries.

[0043] (1) Take 9.5g of strontium titanate, add 0.5g of polyvinylidene fluoride, dissolve it with 6mL of NMP, and coat it on a glass plate with a thickness of 50 μm, and dry it in vacuum at 80°C to form a film for use;

[0044] (2) Take 5g of polyvinylidene fluoride, dissolve it in 50g of NMP, and coat it on a glass sheet with a coating thickness of 10 μm, and dry it in vacuum at 80°C to form a film, that is, polyvinylidene fluoride PVDF film;

[0045] (3) The membrane obtained in step (1) is sandwiched between the conventional PP-PE composite porous membrane for lithium batteries and the polyvinylidene fluori...

Embodiment 3

[0057] This example describes the situation where the first layer of film is a common micron-sized nylon non-woven fabric, the second layer of film is copper calcium titanate particles, and the third layer of film is a polyvinyl alcohol film to form a separator for use in nickel-metal hydride batteries. :

[0058] (1) Take 5g of polyvinyl alcohol, dissolve the coating film with distilled water, heat and dry at 50°C for 5 hours to obtain a polyvinyl alcohol film; spread a layer of copper calcium titanate with a particle size of 2-2.5 μm evenly on it, and the spreading thickness is 10 μm; cover it with a layer of common micron-sized nylon non-woven fabric, and compact the obtained sandwich film with a roller press to obtain a sandwich composite film c.

[0059] The above-mentioned interlayer composite film c and the common micron-sized nylon non-woven fabric are respectively used as battery separators to form a model battery system: conventional stainless steel electrode / diaphra...

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Abstract

The invention discloses a highly-dielectric battery diaphragm. The highly-dielectric battery diaphragm is provided with a sandwich structure, wherein an outer layer of the highly-dielectric battery diaphragm is a protective film of a basal body, the protective film can be a flexible film in a porous structure, and also can be a flexible film without a porous structure; and an inner layer is made from substances with high dielectric constants, and the inner layer can exist in a particle state, or exist in a film state. The outer layer and the inner layer are combined together in an adhering and flattening mode. The composite highly-dielectric battery diaphragm has high ionic conductivity, and favorable large-ratio charge and discharge properties and cycling performance can be displayed after the highly-dielectric battery diaphragm is assembled to form a battery.

Description

technical field [0001] The invention belongs to the field of membrane materials, and in particular relates to a high dielectric diaphragm for chemical power supply. Background technique [0002] The separator is one of the key components in the battery. Its function is to separate the positive and negative electrodes and prevent the internal short circuit of the battery. General requirements for separators include good mechanical properties, including tensile resistance and good flexibility, good interfacial properties, good ion conductivity, and high electrolyte retention. [0003] Typically, the separator is used submerged in the electrolyte. Electrolyte is composed of electrolyte and solvent. The ionic conductivity of the electrolyte is determined by two factors: the degree of dissociation of the electrolyte and the migration rate of ions in the solvent. Therefore, the higher requirement for the separator is to assist in improving the ionic conductivity of the electrol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 张汉平杜青李成钢孙晓辉
Owner 山东鲁顺宏泰新能源科技有限公司
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