Composite all solid-state polymer electrolyte lithium ion battery and preparation method of composite all solid-state polymer electrolyte lithium ion battery

An all-solid-state polymer, lithium-ion battery technology, applied in the field of lithium-ion batteries and their preparation, all-solid-state polymer electrolyte preparation, composite all-solid-state polymer electrolyte lithium-ion batteries and their preparation fields, can solve the problem of poor mechanical properties, All solid-state electrolytes have problems such as low ionic conductivity, and achieve the effect of improving ionic conductivity, taking into account mechanical properties, and improving ionic conductivity.

Active Publication Date: 2012-10-03
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the defects of low ion conductivity and poor mechanical properties of the all-solid-state electrolyte in the prior art, and provide a composite all-solid-state polymer electrolyte lithium-ion battery, so that the composite all-solid-state polymer electrolyte lithium-ion battery can operate at normal temperature High ionic conductivity, good mechanical properties, good thermal stability and electrochemical stability

Method used

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  • Composite all solid-state polymer electrolyte lithium ion battery and preparation method of composite all solid-state polymer electrolyte lithium ion battery

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Embodiment 1

[0037] A composite all-solid-state polymer electrolyte lithium-ion battery, comprising a battery case and a pole core, the pole core is sealed and accommodated in the battery case, and the pole core includes a positive electrode, a negative electrode and a composite full battery between the positive electrode and the negative electrode. The solid polymer electrolyte is characterized in that: the composite all-solid polymer electrolyte includes dimethylsiloxane-ethylene oxide copolymer, lithium salt and nano inorganic filler.

[0038]Compared with the existing composite solid polymer electrolyte, the composite solid polymer electrolyte matrix material used in the present invention is dimethylsiloxane-ethylene oxide copolymer (P(DMS-CO-EO)) due to the polymer chain The regularity of the segment decreases, and the crystallinity of the polymer on the surface decreases, so it has higher ionic conductivity at room temperature.

Embodiment 2

[0040] A composite all-solid-state polymer electrolyte lithium-ion battery, comprising a battery case and a pole core, the pole core is sealed and accommodated in the battery case, and the pole core includes a positive electrode, a negative electrode and a composite full battery between the positive electrode and the negative electrode. The solid polymer electrolyte is characterized in that: the composite all-solid polymer electrolyte includes dimethylsiloxane-ethylene oxide copolymer, lithium salt and nano inorganic filler.

[0041] The mass ratio of dimethylsiloxane and ethylene oxide in the dimethylsiloxane-ethylene oxide copolymer is 7:3.

[0042] The mass ratio of O atoms to Li atoms in the described dimethylsiloxane-ethylene oxide copolymer and the lithium salt is 6:1, and the described nano-inorganic filler accounts for lithium salt and dimethylsiloxane- 5% of the total mass of ethylene oxide copolymer.

[0043] The lithium salt is one of lithium perchlorate and lithiu...

Embodiment 3

[0046] A composite all-solid-state polymer electrolyte lithium-ion battery, comprising a battery case and a pole core, the pole core is sealed and accommodated in the battery case, and the pole core includes a positive electrode, a negative electrode and a composite full battery between the positive electrode and the negative electrode. The solid polymer electrolyte is characterized in that: the composite all-solid polymer electrolyte includes dimethylsiloxane-ethylene oxide copolymer, lithium salt and nano inorganic filler.

[0047] The mass ratio of dimethylsiloxane and ethylene oxide in the dimethylsiloxane-ethylene oxide copolymer is 3:7.

[0048] The mass ratio of O atoms to Li atoms in the described dimethylsiloxane-ethylene oxide copolymer and the lithium salt is 25:1, and the described nano-inorganic filler accounts for lithium salt and dimethylsiloxane- 10% of the total mass of ethylene oxide copolymer.

[0049] The lithium salt is one of lithium perchlorate and lith...

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Abstract

The invention discloses a composite all solid-state polymer electrolyte lithium ion battery and a preparation method of the composite all solid-state polymer electrolyte lithium ion battery, and belongs to the all solid-state polymer electrolyte preparation technology and the lithium ion battery field. The composite all solid-state polymer electrolyte lithium ion battery disclosed by the invention comprises a battery case and an electrode core, wherein the electrode core is accommodated in the battery case in a sealed way and comprises a positive electrode, a negative electrode and composite all solid-state polymer electrolytes positioned between the positive electrode and the negative electrode, and the composite all solid-state polymer electrolytes comprise dimethyl siloxane-ethylene oxide copolymers, lithium salts and nanometer inorganic fillers. Compared with the existing composite all solid-state polymer electrolytes, the composite all solid-state polymer electrolytes adopted by the invention have the advantages that base materials are the dimethyl siloxane-ethylene oxide copolymers, the regularity of the polymer chain segment is reduced, and the crystallization degree of the polymers at the surface is reduced, so higher ionic conductivity is realized at normal temperature.

Description

technical field [0001] The invention relates to a lithium-ion battery and a preparation method thereof, in particular to a composite all-solid polymer electrolyte lithium-ion battery and a preparation method thereof, and belongs to the field of all-solid-state polymer electrolyte preparation technology and lithium-ion batteries. Background technique [0002] Compared with other chemical power sources, lithium-ion secondary batteries have many excellent properties, such as high energy density, long cycle life, high open circuit voltage, no memory effect, safety and pollution-free, etc. After nearly two decades of rapid development, they have become Widely used in mobile phones, notebook computers, digital cameras and other portable devices. In recent years, with the further improvement of the energy density of lithium-ion batteries, its application fields are gradually expanding to high-tech fields such as aerospace, satellites, missile electric vehicles, etc. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 谢皎王瑨胡蕴成阮晓莉
Owner DONGFANG ELECTRIC CORP LTD
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