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Current collector, preparation method thereof, and lithium ion battery

A lithium-ion battery, current collector technology, applied in battery electrodes, secondary batteries, electrode carriers/current collectors, etc. Ease of handling, weight reduction, and improved safety effects

Pending Publication Date: 2019-10-18
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is cumbersome, may affect the performance of the electrolyte, and does not contribute to improving battery safety
[0008] However, the above lithium supplementation methods all have imprecise lithium supplementation, or do not help to improve battery safety.

Method used

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  • Current collector, preparation method thereof, and lithium ion battery
  • Current collector, preparation method thereof, and lithium ion battery
  • Current collector, preparation method thereof, and lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0059] This embodiment provides a current collector, and the structural schematic diagram of the current collector is as follows figure 1 shown. The current collector comprises a base layer 1, a lithium supplementary layer 2 on the base layer, and a conductive protection layer 3 on the lithium supplementary layer. The base layer 1 is an aluminum layer with a thickness of 8 μm. The lithium replenishing layer 2 is a metal lithium layer with a thickness of 3 μm. The conductive protective layer 3 is an aluminum layer with a thickness of 8 μm.

[0060] This embodiment also provides a method for preparing the current collector, the method comprising the following steps:

[0061] (1) In the evaporation machine, under the vacuum of 5 Pa, metal lithium is used as the plating material, and high-frequency induction is used to generate high temperature, so that lithium metal is heated and evaporated at 1200 ° C for 1.5 hours. After the lithium evaporates, it rises to The upper vapor d...

Embodiment 2

[0065] This embodiment provides a current collector, which includes a base layer, a lithium supplementary layer on the base layer, and a conductive protective layer on the lithium supplementary layer. The base layer is an aluminum layer with a thickness of 5 μm, and the lithium supplement layer is a metal lithium layer with a thickness of 0.1 μm. The conductive protective layer is an aluminum layer with a thickness of 10 μm.

[0066] This embodiment also provides a method for preparing the current collector, the method comprising the following steps:

[0067] (1) In the evaporation machine, under the vacuum of 10Pa, metal lithium is used as the plating material, and high-frequency induction is used to generate high temperature, so that lithium metal is heated and evaporated at 800 ° C for 1 hour. The upper evaporation chamber of the plating machine is cooled by a cooling system at a temperature of -5°C in the evaporation chamber, and the lithium is condensed on the strip of t...

Embodiment 3

[0071] This embodiment provides a current collector, which includes a base layer, a lithium supplementary layer on the base layer, and a conductive protective layer on the lithium supplementary layer. The base layer is an aluminum layer with a thickness of 10 μm. The lithium supplement layer is a metal lithium layer with a thickness of 5 μm. The conductive protective layer is an aluminum layer with a thickness of 5 μm.

[0072] This embodiment also provides a method for preparing the current collector, the method comprising the following steps:

[0073] (1) In the evaporation machine, 10 -5 Under Pa vacuum, metal lithium is used as the plating material, and high-frequency induction is used to generate high temperature, so that lithium metal is heated and evaporated at 1500 ° C for 2 hours. After the lithium evaporates, it rises to the upper evaporation chamber of the evaporation machine through the baffle plate. The evaporation chamber is cooled by a cooling system at a tem...

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Abstract

The invention discloses a current collector, a preparation method thereof and a lithium ion battery. The current collector comprises a substrate layer, a lithium supplementing layer located on the substrate layer, and a conductive protection layer located on the lithium supplementing layer. The preparation method comprises the following steps: (1) depositing a lithium supplementing layer on a substrate layer; (2) preparing a conductive protective layer on the lithium supplementing layer at step (1) to obtain the current collector. The current collector provided by the invention has a lithium supplementing function, can realize accurate lithium supplementing, and can reduce the weight of the current collector. According to the current collector provided by the invention, the energy densityof the ion battery using the current collector can be improved, and the safety is improved.

Description

Technical field [0001] The invention belongs to the technical field of energy storage and relates to a current collector, a preparation method thereof and a lithium-ion battery. Background technique [0002] A lithium-ion battery is a secondary battery (rechargeable battery) that relies primarily on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between the two electrodes: When charging, Li + It is deintercalated from the positive electrode and embedded in the negative electrode through the electrolyte. The negative electrode is in a lithium-rich state; the opposite is true during discharge. Lithium-ion batteries pursue high energy density, and increasing capacity is one of the ways to increase energy density. [0003] The first Coulombic efficiency of the positive and negative electrode materials of lithium-ion batteries is less than 100%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/13H01M10/0525H01M10/42
CPCH01M4/667H01M4/661H01M4/13H01M10/0525H01M10/4242Y02E60/10
Inventor 宋贺华秉杨林沃荣梁正峰黄天翔
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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