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Quick-charging polymer lithium ion battery based on carbon-based nanometer materials

A technology of carbon-based nanomaterials and lithium-ion batteries, which is applied in the direction of carbon nanotubes, nanocarbons, battery electrodes, etc., to achieve the effects of shortening the batching time, increasing flexibility, and improving fast charging and cycle performance

Active Publication Date: 2018-07-10
江西格林德能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are few reports on fast charging related research on high-energy-density polymer lithium-ion batteries (volume energy density greater than 400Wh / L) used in portable electronic products such as smart phones, tablet computers, mobile power supplies, drones, and electric balance vehicles.

Method used

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  • Quick-charging polymer lithium ion battery based on carbon-based nanometer materials
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  • Quick-charging polymer lithium ion battery based on carbon-based nanometer materials

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Embodiment 1

[0039] A kind of fast charging polymer lithium-ion battery based on carbon-based nanomaterials of the present embodiment, its preparation comprises the following steps:

[0040] (1) Preparation of positive electrode sheet:

[0041] The solid mass percentage of each component of the positive electrode is lithium cobaltate: graphene / carbon nanotube composite conductive agent: KS-6: PVDF=95.2:1.1:1.2:2.5, as follows:

[0042] A. Add polyvinylidene fluoride and N-methylpyrrolidone into the high-speed shear disperser according to the ratio of 0.05:0.95, stir in vacuum at high speed for 120min, and prepare the adhesive glue;

[0043] B. Add graphene / carbon nanotube composite conductive liquid and micron-sized conductive graphite KS-6 into a sand mill with zirconium beads for grinding and ultra-fine dispersion for 1.0h, the speed is 2600 rpm, and the size of the zirconia grinding beads is 1.1mm, turn on the cooling circulating water to cool down during the grinding process, and obta...

Embodiment 2

[0065] A kind of fast charging polymer lithium-ion battery based on carbon-based nanomaterials of the present embodiment, its preparation comprises the following steps:

[0066] (1) Preparation of positive electrode sheet:

[0067] The solid mass percentage of each component of the positive electrode is lithium cobaltate: graphene / carbon nanotube composite conductive agent: KS-6: PVDF=96.0:0.9:1.0:2.1, as follows:

[0068] A. Add polyvinylidene fluoride and N-methylpyrrolidone into the high-speed shear disperser according to the ratio of 0.05:0.95, stir in vacuum at high speed for 150min, and prepare the adhesive glue;

[0069] B. Add graphene / carbon nanotube composite conductive liquid and micron-sized conductive graphite KS-6 into a sand mill with zirconium beads for grinding and ultrafine dispersion for 1.2h, with a speed of 2800 rpm, and the size of the zirconia grinding beads is 1.1mm, turn on the cooling circulating water to cool down during the grinding process, and ob...

Embodiment 3

[0091] A kind of fast charging polymer lithium-ion battery based on carbon-based nanomaterials of the present embodiment, its preparation comprises the following steps:

[0092] (1) Preparation of positive electrode sheet:

[0093] The solid mass percentage of each component of the positive electrode is lithium cobaltate: graphene / carbon nanotube composite conductive agent: KS-6: PVDF=96.7:0.7:0.8:1.8, as follows:

[0094] A. Add polyvinylidene fluoride and N-methylpyrrolidone into the high-speed shear disperser according to the ratio of 0.05:0.95, stir at high speed in vacuum for 180min, and prepare the adhesive glue;

[0095] B. Add graphene / carbon nanotube composite conductive liquid and micron-sized conductive graphite KS-6 into a sand mill with zirconium beads for grinding and ultrafine dispersion for 1.5 hours, with a speed of 3000 rpm, and the size of the zirconia grinding beads is 1.1mm, turn on the cooling circulating water to cool down during the grinding process, a...

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Abstract

The invention discloses a quick-charging polymer lithium ion battery based on carbon-based nanometer materials. An anode sheet of the battery is prepared by mixing anode active substances, carbon-based nanometer material graphene / carbon nanotube compound conductive agents, conductive graphene and PVDF according to a certain mass ratio, adopting an NMP as a solvent, conducting pulping by means ofa sand mill with zirconium beads and a vacuum high-speed blender and then coating aluminum foil with obtained pulp. A cathode sheet is prepared by mixing cathode active substances, carbon-based nanometer material graphene / carbon nanotube compound conductive agents, nanoscale conductive carbon black, CMC and SBR according to a certain mass ratio, adopting deionized water as a solvent, conducting pulping and coating a copper foil current collector with obtained pulp. The anode sheet and the cathode sheet are wound with a partition membrane, packaged, injected with liquid, formed by a high-temperature fixture and subjected to air exhaust, volume distribution and the like, and then the quick-charging polymer lithium ion battery is obtained. The volume energy density of the battery is 460 Wh / Lor above, the battery capacity can be charged to 60% or above within 10 min, and the battery has excellent 3C charging performance, great 1C discharging fast-charge cycling performance and remarkable1C charge-discharge cycling performance.

Description

technical field [0001] The invention belongs to the technical field of polymer lithium-ion battery manufacturing, and in particular relates to a fast-charging polymer lithium-ion battery based on carbon-based nanomaterials. Background technique [0002] Since the industrialization of lithium-ion batteries in the early 1990s, due to their high energy density, high working voltage, long cycle life, fast charging speed, high discharge power, low self-discharge rate, no memory effect, and environmental protection, etc. With outstanding advantages, it has developed rapidly. After 2000, lithium-ion batteries gradually occupied a dominant position in the field of mobile phone batteries until they basically monopolized the field of mobile phone batteries. and other areas of expansion. [0003] At present, the research on fast-charging lithium-ion batteries is mainly concentrated on lithium-ion power batteries, and the volumetric energy density of such batteries is often below 400W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B32/158C01B32/182
CPCH01M4/364H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘小虹李国敏李露
Owner 江西格林德能源有限公司
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