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Application of a cucl/cu composite material

A technology of composite materials and current collectors, which is applied in the direction of electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of reducing the cycle charge/discharge life of electrodes, powdering and falling off, and the combination of active materials and current collectors is not tight enough. Achieve good charge-discharge cycle stability, increase discharge specific capacity, and improve cycle stability

Active Publication Date: 2018-05-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the long-term cycle charging / discharging process, the electrode prepared based on the traditional electrode technology often pulverizes and falls off due to the insufficient combination between the active material and the current collector and reduces the cycle charge / discharge life of the electrode. Therefore, it is necessary to develop a new electrode preparation process.
[0004] Cuprous chloride, as an important organic synthesis catalyst, has been widely used in petrochemical industry, metallurgical industry, pharmaceutical chemical industry and many other industries, but it has not been used as a lithium-ion battery electrode material.

Method used

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  • Application of a cucl/cu composite material
  • Application of a cucl/cu composite material
  • Application of a cucl/cu composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Use 0.1 mol / L sodium chloride aqueous solution with pH=5 as electrolyte solution, copper foil as working electrode, platinum plate as counter electrode, constant current (5 mA / cm 2 ) Anodized for 60 s, rinsed and dried under vacuum at 25°C to obtain CuCl / Cu composite material.

[0024] The prepared CuCl / Cu composite material is directly used as the working electrode, the lithium foil is used as the counter electrode and the reference electrode, the Celgard2500 membrane is used as the diaphragm, and 1 M LiPF is used. 6 The mixed solution of ethylene carbonate (EC), diethyl carbonate (DEC), and dimethyl carbonate (DMC) is the electrolyte. Among them, the volume ratio of EC, DEC and DMC is 1:1:1. The high-purity argon glove box is assembled with lithium foil to form a button-type simulated lithium-ion battery, and its charge / discharge performance and cycle stability are tested by a constant current charge / discharge method.

Embodiment 2

[0026] Use 0.1 mol / L sodium chloride aqueous solution with pH=5 as electrolyte solution, copper foil as working electrode, platinum plate as counter electrode, constant current (5 mA / cm 2 ) Anodized for 120 s, rinsed and dried under vacuum at 25°C to obtain CuCl / Cu composite material.

[0027] No additional conductive agent and binder are added, CuCl / Cu composite material is used as working electrode, lithium foil is used as counter electrode and reference electrode, Celgard2400 membrane is used as diaphragm, and 1 M LiPF is used. 6 The mixed solution of ethylene carbonate (EC) and diethyl carbonate (DEC) is electrolyte, in which the volume ratio of EC and DEC is 1:1, and then assembled with lithium foil in a glove box filled with high purity argon A button type simulated lithium-ion battery was formed, and its charge / discharge performance was tested by a constant current charge / discharge method ( Figure 4 ) Energy and cycle stability ( Figure 5 ), it can be seen from the figure ...

Embodiment 3

[0029] A pH=7 0.06 mol / L potassium chloride aqueous solution is used as the electrolyte solution. The working electrode is a copper foil and the counter electrode is a platinum electrode. Constant current (5 mA / cm 2 ) Anodized for 240 s, rinsed and dried under vacuum at 40°C to obtain CuCl / Cu composite material.

[0030] Without adding additional conductive agent and binder, directly use CuCl / Cu composite material as working electrode, use lithium foil as counter electrode and reference electrode, use Celgard2325 membrane as diaphragm, and contain 1 M LiPF 6 The mixed solution of ethylene carbonate (EC), diethyl carbonate (DEC) and dimethyl carbonate (DMC) is the electrolyte, and the volume ratio of EC, DEC and DMC is 1:1:1, which is filled with high purity A button-type simulated lithium-ion battery was assembled in an argon glove box, and its charge / discharge performance and cycle stability were tested by a constant current charge / discharge method.

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Abstract

The invention discloses application of a CuCl / Cu composite material, and belongs to the development and research field of new energy source materials. The CuCl / Cu composite material is substantially obtained through depositing in situ a layer of water-insoluble cubic-crystal phase cuprous chloride active substance on the surface of a metal copper current collector through a one-step anodic oxidation method, and is then assembled with a lithium foil in a glove box filled with high pure argon gas to form a button type simulation lithium ion battery. The homologous substances, i.e. a copper current collector and cuprous chloride, are ingeniously and tightly combined together by an in-situ growth method; the specific surface area of the electrode material is large; the combination with the copper current collector is tight; and the contact resistance is favorably reduced. Compared with the traditional coating type electrode process, the process has the advantages that the operation is simple, environment-friendly and easy for amplification; more importantly, the falling phenomenon of the active substance in the long-period charging / discharging process is favorably relieved; and the rate discharging performance and charging / discharging cycle performance of the lithium ion battery are improved.

Description

Technical field [0001] The invention relates to the application of a CuCl / Cu composite material, in particular to the application of a CuCl / Cu composite material in a lithium ion battery, and belongs to the field of development and research of new energy materials. Background technique [0002] Lithium-ion battery is a green energy storage device with high efficiency and high energy density, which has been widely used in portable electronic equipment. Electrode materials are one of the key components of lithium-ion batteries, closely related to the performance of lithium-ion batteries, and are one of the research hotspots. [0003] The electrode preparation process of traditional lithium-ion batteries is a physical painting process, that is, the active material, the conductive agent (acetylene black), and the binder (PVDF) are uniformly mixed into an electrode slurry in a certain proportion, and then directly coated on the surface of the current collector. . Electrodes prepared b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/582H01M4/626H01M10/0525Y02E60/10
Inventor 侯宏英刘松刘显茜段继祥孟瑞晋
Owner KUNMING UNIV OF SCI & TECH