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Electrode for lithium ion battery and preparation and application of electrode

A lithium-ion battery and electrode technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as irreversibility and capacity attenuation, and achieve the effects of suppressing capacity attenuation, improving cycle performance, and improving current collection effect

Active Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the charging and discharging process proceeds, the electrode will still have an irreversible volume change during the charging and discharging process, which cannot be restored, and eventually the capacity will gradually decay due to the destruction of the electrode structure.

Method used

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  • Electrode for lithium ion battery and preparation and application of electrode
  • Electrode for lithium ion battery and preparation and application of electrode
  • Electrode for lithium ion battery and preparation and application of electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031]Take 0.4g of binder PVDF dissolved in 12g of N-methylpyrrolidone (NMP), stir for 1h, add 1.2g of commercial nano silicon powder, 0.4g of superP conductive carbon powder and stir for 4h, adjust the scraper to 300μm, hang on the copper foil Coated into a film, dried overnight at 65°C, put a 60mm*60mm nickel foam with a thickness of 1mm, and placed it in an aqueous solution of sulfuric acid with a pH value between 2.0-5.0 for 10 minutes of activation pretreatment, and the treated foam The nickel is cleaned with deionized water, and the electrode material is bound with a rubber band so that the surface of the nickel foam is in close contact with the front and back sides of the self-supporting flexible electrode. Then it was placed in the electroless plating solution at 90° C. for 10 minutes to carry out chemical in-situ deposition of metal nickel phosphorus cobalt. The chemical plating solution composition is 20g / L nickel sulfate; 24g / L sodium hypophosphite; 1ml / L 10wt% PTFE...

Embodiment 2

[0034] Electrode matrix preparation and electroless plating modification operation process is the same as that of Example 1, and the parameter of modulation is that PTFE concentration is 3ml / L 10wt% PTFE aqueous solution, and the assembled battery carries out battery cycle performance test under 0.1C rate, 0.1C- The rate performance test was performed at 1C rate.

[0035] 200mA g -1 Under the discharge rate, the specific capacity of the first cycle discharge is 3583mAh g -1 , the capacity was maintained at 3023mAh g after 100 cycles -1 ; When the magnification is increased to 2000mA g -1 , the discharge specific capacity is 1954mAh g -1 .

[0036] Depend on figure 1 As shown in the two figures, the silicon anode material is modified by electroless plating, and a layer of Ni-P-PTFE coating with metallic luster and dark color will be deposited on its surface. This coating can not only inhibit the process of silicon electrode from intercalating lithium The problem of capaci...

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Abstract

The invention discloses an electrode for a lithium ion battery and preparation and application of the electrode. The electrode takes foamed nickel as a catalyst, a formed nickel plate is in contact with an outer surface of a plate-shaped silicon electrode matrix of a to-be-deposited conductive substance, chemical in-situ deposition of the silicon electrode matrix is achieved by a contact-type chemical plating process, so that nickel phosphorus composite coating layers are deposited on a surface of the silicon electrode matrix and in the silicon electrode matrix. When the electrode is used as anegative electrode to be applied to a lithium ion secondary battery, the performance and the energy density of the negative electrode of the lithium ion battery can be obviously improved, and the electrode has huge potential of achieving large-scale industrial production in future.

Description

technical field [0001] The invention relates to the preparation of silicon negative electrodes in secondary lithium ion batteries. Background technique [0002] In recent years, with the increasingly serious global energy and environmental crisis, lithium-ion batteries have become the preferred power source for various electronic products such as laptops, electric bicycles and other electronic devices due to their advantages of no memory effect, fast reversible charge and discharge, and high Coulombic efficiency. [0003] However, people have made slow progress in the research of high-capacity lithium-ion batteries. This is because lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate and their derivatives and commercial negative electrode material graphite, which are currently used as positive electrode materials for lithium-ion batteries, are already close to the theoretical capacity, and it is difficult to improve. In order to meet the demand for high-cap...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/04H01M10/0525
CPCY02E60/10
Inventor 勾剑李先锋张华民张洪章杨晓飞陈雨晴于滢
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI