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Preparation method of high-energy density polymer lithium ion battery

A lithium-ion battery, high energy density technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, final product manufacturing, etc., can solve the problems of affecting battery safety performance, affecting battery cycle performance, poor puncture resistance, etc., to achieve improvement Battery safety performance, increased hardness and space utilization, and the effect of reducing battery internal resistance

Inactive Publication Date: 2018-06-29
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Increasing the voltage of the lithium-ion battery from 4.2V to 4.35V can increase the volumetric energy density of the lithium-ion battery. However, under high voltage conditions, the surface of the positive electrode has a high oxidation potential, and the separator is easily oxidized, which affects the cycle performance of the battery.
Using a thinner separator can also increase the volume energy density of lithium-ion batteries, but because the separator is thinner, its puncture resistance is poor, which affects the safety performance of the battery

Method used

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  • Preparation method of high-energy density polymer lithium ion battery
  • Preparation method of high-energy density polymer lithium ion battery
  • Preparation method of high-energy density polymer lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of high energy density polymer lithium ion battery, comprises the steps:

[0025] A. The positive electrode uses 4.35V high-voltage lithium cobalt oxide, and the negative electrode material is artificial graphite. The slurry is made according to the conventional pulping process, and then according to the principle that there must be a negative electrode dressing area at the position where there is a positive electrode dressing area, the pole pieces are processed by a staggered structure process. production, and then wind the prepared positive electrode sheet, negative electrode sheet and PE film coated with ceramics and polyvinylidene fluoride on one side, the coating of the separator faces the positive electrode sheet, and the non-coated face faces the negative electrode sheet. The positive electrode tab (a) just falls on the negative electrode empty foil area (2), the negative electrode tab (b) just falls on the positive electrode empty foil area (...

Embodiment 2

[0032] Embodiment 2: a kind of high energy density polymer lithium ion battery, comprises the steps:

[0033] A. The positive electrode uses 4.35V high-voltage lithium cobalt oxide, and the negative electrode material is artificial graphite. The slurry is made according to the conventional pulping process, and then according to the principle that there must be a negative electrode dressing area at the position where there is a positive electrode dressing area, the pole pieces are processed by a staggered structure process. production, and then wind the prepared positive electrode sheet, negative electrode sheet and PE film coated with ceramics and polyvinylidene fluoride on one side, the coating of the separator faces the positive electrode sheet, and the non-coated face faces the negative electrode sheet. The positive electrode tab (a) just falls on the negative electrode empty foil area (2), the negative electrode tab (b) just falls on the positive electrode empty foil area (...

Embodiment 3

[0040] Embodiment 3: a kind of high energy density polymer lithium ion battery, comprises the steps:

[0041] A. The positive electrode uses 4.35V high-voltage lithium cobalt oxide, and the negative electrode material is artificial graphite. The slurry is made according to the conventional pulping process, and then according to the principle that there must be a negative electrode dressing area at the position where there is a positive electrode dressing area, the pole pieces are processed by a staggered structure process. production, and then wind the prepared positive electrode sheet, negative electrode sheet and PE film coated with ceramics and polyvinylidene fluoride on one side, the coating of the separator faces the positive electrode sheet, and the non-coated face faces the negative electrode sheet. The positive electrode tab (a) just falls on the negative electrode empty foil area (2), the negative electrode tab (b) just falls on the positive electrode empty foil area (...

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Abstract

The invention discloses a preparation method of a high-energy density polymer lithium ion battery. The preparation method is characterized in that a positive plate and a negative plate are manufactured by adopting a staggered structure process according to the principle that a position of a positive dressing area is covered by a negative dressing area, and the to-be-formed battery is prepared by winding, encapsulating and injecting a liquid into the obtained positive plate, the negative plate, and a PE film or a PP coating membrane, wherein the single surface of the PE film or the PP coating membrane is coated with a ceramic , and vinylidene fluoride is additionally polymerized on the PE film or the PP coating membrane. The to-be-formed battery is subjected to high temperature thermal pressing, low temperature cold pressing and ageing and is then pressed at the high temperature to prepare the high-energy density polymer lithium ion battery. The positive plate and the negative plate adopt the staggered structure, the nanometer ceramic oxide is arranged in the single side of the membrane in a coating manner, and the vinylidene fluoride is additionally polymerized on the membrane,therefore, the flatness and the hardness of the battery are increased, the battery achieves excellent safety performance and cycle performance while the high energy density is realized.

Description

technical field [0001] The invention belongs to the technical field of design and manufacture of lithium-ion batteries, and in particular relates to a preparation method of a high-voltage, high-energy-density polymer lithium-ion battery that can be applied to consumer electronic products such as smart phones and tablet computers. Background technique [0002] The flexibility of polymer lithium-ion battery structure and size is widely used in consumer electronic products such as mobile phones and tablet computers. The volumetric energy density, cycle life, and safety requirements of polymer lithium-ion batteries are getting higher and higher. [0003] Increasing the voltage of the lithium-ion battery from 4.2V to 4.35V can increase the volumetric energy density of the lithium-ion battery. However, under high voltage, the surface of the positive electrode has a high oxidation potential, and the separator is easily oxidized, which affects the cycle performance of the battery. ...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 李露黄小李国敏
Owner SHENZHEN GPC ENERGY GRP CO LTD
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