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Rapid-charging polymer lithium ion battery making method and battery thereof

A lithium-ion battery, fast charging technology, applied in the direction of secondary batteries, circuits, electrical components, etc., to achieve the effect of improving fast charging, improving cycle performance and safety performance, and improving electrical conductivity

Inactive Publication Date: 2017-09-12
SHENZHEN GPC ENERGY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On portable electronic products such as smartphones, tablet computers, mobile power supplies, drones, etc., high-energy-density lithium-ion batteries (battery volumetric energy density greater than 400Wh / L), research related to fast charging is rarely reported.

Method used

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  • Rapid-charging polymer lithium ion battery making method and battery thereof
  • Rapid-charging polymer lithium ion battery making method and battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of the fast-charging polymer lithium-ion battery of this embodiment specifically includes the following steps:

[0039] 1. Preparation of positive electrode conductive paste, positive electrode paste and positive electrode sheet

[0040] (1) Preparation of positive electrode conductive paste

[0041] Prepare 4.0% high-viscosity polyvinylidene fluoride (PVDF), 1.0% carbon nanotube conductive agent, 1.5% nano-conductive carbon black, 10% positive electrode material nickel cobalt lithium manganate LiNi 0.5 co 0.2 mn0.3 o 2 materials;

[0042] ② Add all the binder PVDF into the N-methylpyrrolidone (NMP) solvent in the mixer, and carry out vacuum stirring at a speed of 1500 revolutions / min and 35 revolutions / min to obtain the PVDF binder slurry; Add all the carbon nanotube conductive agent, nano conductive carbon black and positive electrode material nickel cobalt lithium manganate LiNi to the binder slurry 0.5 co 0.2 mn 0.3 o 2 3000 revolutions / mi...

Embodiment 2

[0059] The preparation of the fast-charging polymer lithium-ion battery of this embodiment specifically includes the following steps:

[0060] 1. Preparation of positive electrode conductive paste, positive electrode paste and positive electrode sheet

[0061] (1) Preparation of positive electrode conductive paste

[0062] Prepare 2.0% high-viscosity polyvinylidene fluoride (PVDF), 0.3% carbon nanotube conductive agent, 0.5% nano conductive carbon black, 5% positive electrode material nickel cobalt lithium manganate LiNi 0.3 co 0.3 mn 0.3 o 2 materials;

[0063] ② Add all the binder PVDF into the N-methylpyrrolidone (NMP) solvent in the mixer, and vacuum stir at a speed of 1000 revolutions / min and 25 revolutions / min to obtain the PVDF binder slurry; Add all the carbon nanotube conductive agent, nano conductive carbon black and positive electrode material nickel cobalt lithium manganate LiNi to the binder slurry 0.3 co 0.3 mn 0.3 o 2 , in a mixer with 2000 revolutio...

Embodiment 3

[0080] The preparation of the fast-charging polymer lithium-ion battery of this embodiment specifically includes the following steps:

[0081] 1. Preparation of positive electrode conductive paste, positive electrode paste and positive electrode sheet

[0082] (1) Preparation of positive electrode conductive paste

[0083] Prepare 3.0% high-viscosity polyvinylidene fluoride (PVDF), 0.7% carbon nanotube conductive agent, 1.0% nano-conductive carbon black, 8% positive electrode material nickel cobalt lithium manganate LiNi 0.4 co 0.2 mn 0.4 o 2 materials;

[0084] ② Add all the binder PVDF into the N-methylpyrrolidone (NMP) solvent in the mixer, and carry out vacuum stirring at a speed of 1200 revolutions / min and 30 revolutions / min to obtain the PVDF binder slurry; Add all the carbon nanotube conductive agent, nano conductive carbon black and positive electrode material nickel cobalt lithium manganate LiNi to the binder slurry 0.4 co 0.2 mn 0.4 o 2 , carry out vacuum...

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Abstract

The invention discloses a rapid-charging polymer lithium ion battery making method and a battery thereof. A small amount of a positive electrode material nickel cobalt lithium manganate which is ultrafinely dispersed through sand milling is effectively compounded with a linear carbon nanotube conductive agent and spherical nanometer conductive carbon black to form a honeycomb network conductive structure, so the conductive performance of a positive electrode material is greatly improved; the sand-milling ultrafine dispersed linear carbon nanotube conductive agent and the spherical nanometer conductive carbon black are effectively compounded to form the honeycomb network conductive structure, so the conductive performance of a negative electrode material is greatly improved, thereby comprehensively improving the rapid charging property and the rate performances of the battery and improving the cycle performance and the safety of the battery. The volume energy density of the rapid-charging polymer lithium ion battery produced under a high electrode surface density is 400 Wh / L or more, 45% or above of the battery capacity is reached when charging at 1.0 C rate is carried out for 30 min, and 70% or above of the battery capacity is reached when charging at 2.0 C rate is carried out for 30 min.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery manufacturing, and in particular relates to a preparation method of a fast-charging polymer lithium-ion battery and the battery. Background technique [0002] In the past two years, the size of the new generation of smart phones is getting bigger and bigger, the resolution of the screen is getting higher and higher, and the computing speed of the mobile application processor (AP) is also getting faster and faster. These changes require larger capacity lithium batteries come to support. With the increase of battery capacity, high-power and efficient fast charging technology becomes necessary, and the existing traditional 5V USB charger uses a unified charging interface Micro-USB, according to the standard issued by the USB Association, the maximum allowable charge of Micro-USB The current is 1.8A, which means that the traditional 5V USB charger will be limited to less than 9W, and can ...

Claims

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Application Information

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IPC IPC(8): H01M10/0587H01M10/0525
CPCH01M10/0525H01M10/0587Y02E60/10Y02P70/50
Inventor 刘小虹李国敏李露
Owner SHENZHEN GPC ENERGY GRP CO LTD