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High-capacity metal lithium powder composite cathode and preparation method thereof, and multi-layer composite electrode

A metal lithium powder, multi-layer composite technology, applied in the field of electrochemical power supply, can solve the problems of low volume specific capacity, loss of powdered advantages, high contact resistance, etc., to improve specific capacity, inhibit growth, and prevent internal short circuits. Effect

Inactive Publication Date: 2011-09-28
EC POWER LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, powderization only improves the mass specific capacity of metal lithium anode, but its volume specific capacity is very low. Secondly, due to the loose contact between particles, the contact resistance is large, and the metal lithium powder particles gradually grow up during repeated charging and discharging. , loses the advantage of powdering

Method used

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  • High-capacity metal lithium powder composite cathode and preparation method thereof, and multi-layer composite electrode
  • High-capacity metal lithium powder composite cathode and preparation method thereof, and multi-layer composite electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Preparation of high-capacity metal lithium powder composite negative electrode: under the protection of argon atmosphere, 30 grams of toluene as a solvent and 4.5 grams of polyvinylidene fluoride (PVDF) as a binder were mixed to make a glue solution, and 20 grams of lithium metal powder , 40 grams of graphite as the negative electrode powder, 0.5 grams of surfactant (polyvinylpyrrolidone (PVP)), 5 grams of acetylene black as the conductive agent are added to the glue, stirred evenly and then sprayed onto the surface of the current collector with the conductive glue layer , (that is, sprayed onto the surface of the conductive adhesive layer, wherein the current collector with the conductive adhesive layer can be prepared using existing technology or commercially available), dried and rolled at 120 ° C, that is, the high-capacity metal is completed on the surface of the conductive adhesive layer Preparation of lithium powder composite negative electrode, the specific capac...

Embodiment 2

[0078] see figure 1 , a multilayer composite electrode, which is composed of a current collector 1, a conductive adhesive layer 2, a high-capacity metal lithium powder composite negative electrode 3, a hot-pressed graphite layer 4, an insulating protective layer 5 and a separator 6 distributed in sequence. Its preparation method is as follows:

[0079] Preparation of a current collector with a conductive adhesive layer: take a copper foil with a thickness of 10 μm as a current collector, mix 30 grams of sodium polyacrylate (PAA), 8 grams of water and 2 grams of Ca(OH) 2 Mix evenly to make 40 grams of glue A, mix 5 grams of acetylene black (SP) and 55 grams of water evenly to make 60 grams of conductive paste, take 40 grams of prepared glue A and add it to 60 grams of conductive paste and mix evenly Get conductive glue.

[0080] The conductive adhesive was coated on the surface of the copper foil current collector by the gravure printing method, and dried at 120°C to obtain a...

Embodiment 3

[0086] Adopt the preparation method of embodiment 1 to prepare multi-layer composite electrode, the difference is that the preparation of high-capacity metal lithium powder composite negative electrode adopts the following steps:

[0087] Under the protection of an argon atmosphere, mix and stir 95 grams of toluene and 4.5 grams of vinyl acetate to obtain a glue; add 15 grams of lithium metal powder, 75 grams of tin powder, and 5 grams of carbon nanotubes into the glue, stir well and then spray To the surface of the conductive adhesive layer, drying and rolling at 160°C, that is, the preparation of a high-capacity metal lithium powder composite negative electrode is completed on the surface of the conductive adhesive layer.

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Abstract

The invention discloses a high-capacity metal lithium powder composite cathode and a preparation method thereof and a multi-layer composite electrode. The high-capacity metal lithium powder composite cathode comprises the following components in part by weight: 1 to 80 parts of metal lithium powder, 10 to 90 parts of cathode powder, 1 to 10 parts of conductive agent, 1 to 4.5 parts of adhesive and 0 to 0.5 part of surfactant. By compounding the metal lithium powder with materials such as graphite, soft carbon, hard carbon, tin and oxides thereof, silicon and oxides thereof and the like, mass ratio capacity and volume ratio capacity of a cathode material are improved, using amount of active substances is reduced, and the battery specific capacity is improved; the specific capacity of the cathode can be adjusted by adjusting the rate of metal lithium to the graphite; short circuit in a battery caused by piercing of a diaphragm through metal dendritic crystal growth can be effectively prevented through the separation of an insulating protective layer, so that the safety performance of the battery is improved; and the metal lithium powder is counteracted with irreversible capacity loss of the cathode, and primary Kulun efficiencies of the graphite, the hard carbon, the soft carbon, the tin, the silicon and other cathode materials are improved.

Description

technical field [0001] The invention relates to the field of electrochemical power sources, in particular to a composite negative electrode of high-capacity lithium metal powder and graphite, hard carbon, silicon, tin and other materials and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in mobile phones, notebook computers, portable electronic products and other fields, and will have broad application prospects in electric tools, electric vehicles and other fields. Power tools and electric vehicles require power batteries with higher energy density, lower cost and higher safety. [0003] How to improve the charging and discharging performance of batteries to meet market requirements is a hot issue in front of battery workers. For this reason, battery workers have carried out continuous exploration in the structural design of the battery, the composition of the positive and negative electrodes, and the production proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/38H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 王朝阳朱静于申军
Owner EC POWER LLC
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