Cathode of lithium-ion secondary battery, preparation method and lithium-ion secondary battery

A secondary battery, lithium ion technology, used in electrode manufacturing, ion implantation and plating, active material electrodes, etc., can solve the problems of poor cycle performance, poor charge-discharge capacity and cycle performance, and large irreversible capacity, and achieve discharge capacity. The effect of improving, charging and discharging efficiency, and excellent electrochemical performance

Inactive Publication Date: 2010-02-03
CITIC GUOAN MENGGULI NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of silicon-based materials as negative electrode materials for lithium-ion batteries are: large irreversible capacity for the first time and poor cycle performance, especially the first charge-discharge efficiency is far from that of graphite electrodes
[0007] Therefore, the charge-discharge capacity and cycle performance of the lithium-ion secondary battery of the prior art are still relatively poor, far from being able to meet people's various needs.

Method used

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  • Cathode of lithium-ion secondary battery, preparation method and lithium-ion secondary battery
  • Cathode of lithium-ion secondary battery, preparation method and lithium-ion secondary battery
  • Cathode of lithium-ion secondary battery, preparation method and lithium-ion secondary battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, DC magnetron sputtering technology is used to deposit a Si-C composite film on a current collector Cu foil with a thickness of 12 μm as the negative electrode material layer, using the crystal Si target and the C target as the target materials, wherein the Si layer is the active material layer. The material layer, the C layer covered on the Si layer is a buffer layer, thereby forming the negative electrode of the lithium ion secondary battery. Among them, during the sputtering process, the temperature of the cavity naturally rises, and when the temperature is stable, the temperature of the Cu foil is about 140°C. 2 The flow rate is 10 sccm, the pressure in the sputtering chamber is about 0.6 Pa, and the total sputtering time is 4.5 hours, wherein the Si target sputtering time is 4 hours.

[0043] The half-cell composed of the obtained thin-film negative electrode sheet and metal Li was tested for electrochemical performance. At a current density of 0...

Embodiment 2

[0045] Using magnetron sputtering technology, using crystal Si target and C target as target materials respectively, deposited Si-C composite thin film on the current collector Cu foil with a thickness of 12 μm as the negative electrode material layer, in which the Si layer is the active material layer, covering The C layer on the Si layer is a buffer layer, thereby forming the negative electrode of the lithium ion secondary battery. Among them, during the sputtering process, the temperature of the cavity naturally rises. When the temperature is stable, the temperature of the Cu foil is about 120°C. 2 h 2 The flow rate is 3sccm, the pressure in the sputtering chamber is about 1.6Pa, and the total sputtering time is 4.5 hours, wherein the Si target sputtering time is 4 hours.

[0046] The half-cell composed of the obtained thin-film negative electrode sheet and metal Li was tested for electrochemical performance, and the test current density was 1.2mA / cm 2 , The charge and di...

Embodiment 3

[0048] Using DC magnetron sputtering technology, using crystal Si target and C target as target materials, Si-C composite thin film is deposited on the current collector Cu foil with a thickness of 12 μm as the negative electrode material layer, in which the Si layer is the active material layer. The C layer covered on the Si layer is a buffer layer, thereby forming the negative electrode of the lithium ion secondary battery. Among them, the temperature of the Cu foil is 150°C, the sputtering power of the two targets is 1400W, the flow rate of the working gas Ar is 46 sccm, the doping gas C 2 h 2 The flow rate is 3 sccm, the pressure in the sputtering chamber is 1.6 Pa, and the total sputtering time is 4.5 hours, wherein the Si target sputtering time is 4 hours.

[0049] The half-cell composed of the obtained thin-film negative electrode sheet and metal Li was tested for electrochemical performance, and the test current density was 1.1mA / cm 2 , The charging and discharging v...

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Abstract

The invention provides a cathode of a lithium-ion secondary battery, which comprises a current collector and a cathode material layer covered on the current collector. The cathode material layer is prepared by adopting magnetron sputtering technology under the sputtering power of 1,000 to 5,000 W. By greatly improving the target sputtering power of magnetron sputtering, the prepared lithium-ion secondary battery has high charge/discharge capacitance and excellent cycle performance, and improves the production efficiency of the material, has simple manufacturing process and operation and good electrochemical performance, and greatly improves the primary charge/discharge efficiency and the discharge capacity compared with the reported silicon-based film cathode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion secondary batteries, in particular to a negative pole piece of the lithium ion secondary battery and a preparation method thereof, and the lithium ion secondary battery. Background technique [0002] Secondary lithium-ion batteries are important power sources for notebook computers, cameras, cell phones, and other communication devices, and will be used in cars and other vehicles as green energy. Therefore, batteries with high energy density and high power density are required, and lithium-ion secondary batteries with smaller size, lighter weight, higher energy storage capacity, and better charge-discharge cycle performance need to be obtained. [0003] Silicon-based thin-film anode materials have attracted widespread attention due to their high lithium storage capacity and low lithium intercalation potential, which can meet the current development needs of lithium-ion secondary batteries. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/04C23C14/35C23C10/40
CPCY02E60/12Y02E60/10
Inventor 其鲁张睿刘鑫江卫军
Owner CITIC GUOAN MENGGULI NEW ENERGY TECH
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