Lithium supplementing current collector and preparation method thereof, lithium supplementing pole piece and lithium battery

A current collector and lithium replenishment technology, which is applied in lithium batteries, secondary batteries, battery electrodes, etc., can solve the problems of poor safety and unstable lithium replenishment technology, and achieves enhanced adhesion, enhanced overall electrochemical performance, and improved Effect of Lithium Rate

Active Publication Date: 2021-07-13
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006]Based on this, it is necessary to address the problems of instability and poor safety in the traditional lithium supplementation technology, and provide a lithium supplementation current collector and its preparation method, lithium supplementation electrode chip and lithium battery

Method used

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  • Lithium supplementing current collector and preparation method thereof, lithium supplementing pole piece and lithium battery
  • Lithium supplementing current collector and preparation method thereof, lithium supplementing pole piece and lithium battery

Examples

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preparation example Construction

[0037] The embodiment of the present invention also provides a preparation method of the lithium supplement current collector, comprising the following steps:

[0038] placing the lithium-replenishing slurry between preheated rollers of a roller press for rolling to obtain a self-supporting lithium-replenishing coating, and the preheating temperature of the rollers is 50°C to 150°C;

[0039] The self-supporting lithium-supplementing coating is placed on the metal foil 1, and hot-compression lamination is carried out between the preheated rollers.

[0040] In this embodiment, by preheating the rollers of the roller press to an appropriate temperature, adjusting the gap between the two rollers of the roller press, taking an appropriate amount of powder and placing it on the rollers of the roller press, at a certain rolling speed Rolling is carried out to prepare a self-supporting lithium-replenishing coating with a certain thickness. During this process, the first polymer will ...

Embodiment 1

[0062] Use conductive carbon 3 acetylene black (70% by mass) and passivated lithium metal powder (10% by mass) to fully mix the two by ultrasonic dispersion, ultrasonic mixing time 10min, power 20K; then add polyacrylic acid successively (15% by mass) and polytetrafluoroethylene (5% by mass) were sheared and mixed at a speed of 15000rpm with a high-speed ball mill for 20min (pulse-type mixing was used, that is, mixing for 2min, followed by the next 2min after a 1min pause). Mixing), so that different materials are fully dispersed and uniform and produce a certain bonding effect; further transfer the powder to the airflow mill, and perform high-speed airflow shearing to achieve full fibrillation of PTFE and obtain a certain viscosity. Group powder.

[0063] Preheat the rollers of the vertical roller press to 100°C, adjust the gap between the two rollers of the roller press to 4um, take an appropriate amount of powder and place it between the two rollers of the roller press at a...

Embodiment 2

[0068] Conductive carbon 3 Ketjen black (accounting for 80% by mass) and passivated lithium metal powder (accounting for 5% by mass) are fully mixed by mechanical stirring, the stirring rate is 20000rpm, and the stirring time is 10min; Vinylidene fluoride (12% by mass) and polytetrafluoroethylene (3% by mass) were sheared and mixed at a speed of 12000 rpm for 15 minutes in a high-speed ball mill (pulse mixing was used, that is, mixing for 2 minutes, and then proceeded to the next step after 1 minute of rest. One 2min mixing), so that the different materials are fully dispersed and uniform and produce a certain bonding effect; further transfer the powder to the airflow mill, and perform high-speed airflow shearing to achieve full fibrillation of PTFE and obtain a certain viscous agglomerated powder;

[0069] Preheat the rollers of the vertical roller press to 115°C, adjust the gap between the two rollers of the roller press to 3um, take an appropriate amount of powder and place...

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Abstract

The invention discloses a lithium supplementing current collector which comprises a metal foil and a lithium supplementing layer loaded on the metal foil. The lithium supplementing layer comprises conductive carbon, a lithium-containing additive, a first polymer and/or a derivative thereof, and a second polymer and/or a derivative thereof. The first polymer is selected from any one or more of polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polystyrene, polyvinylidene fluoride, carboxymethyl cellulose, epoxy resin and phenolic resin, and the second polymer is polytetrafluoroethylene. The invention also discloses a preparation method of the lithium supplementing current collector, and the method comprises the following steps of placing lithium-supplementing slurry between the preheated rollers of a roller press for rolling to obtain a self-supporting lithium-supplementing coating, the preheating temperature of the rollers being 50-150 DEG C; placing the self-supporting lithium-supplementing coating on the metal foil, and carrying out hot-pressing compounding between the preheated rollers. The invention also discloses a negative plate. The invention also discloses a lithium battery.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium supplement current collector and a preparation method thereof, a lithium supplement pole piece and a lithium battery. Background technique [0002] In recent years, the market share of new energy vehicles in passenger cars and special vehicles has gradually increased. However, new energy vehicles currently on the market generally have the problem of short mileage, especially low-end entry-level vehicles, which also limits the further popularization of new energy vehicles. Therefore, how to increase the mileage of new energy vehicles and reduce the production cost of new energy vehicles has become an urgent problem for the new energy industry. [0003] As the core component of new energy vehicles, lithium-ion batteries provide corresponding power output for vehicle driving. The main means to increase vehicle mileage is to increase the energy density of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M4/66H01M10/058H01M10/052H01M4/134H01M4/04
CPCH01M10/4235H01M4/667H01M4/0409H01M4/0435H01M4/134H01M10/058H01M10/052Y02P70/50Y02E60/10
Inventor 赵晓宁蔡挺威刘永飞梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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