Battery, battery cathode, battery cathode material and preparation method thereof

A negative electrode material and battery negative electrode technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of capacity fading and unsatisfactory cycle performance of composite materials, etc.

Inactive Publication Date: 2015-01-21
POSITEC POWER TOOLS (SUZHOU) CO LTD +1
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

During the charging and discharging process, although the volume change of silicon has also been suppressed to a certain extent, the cycle performance of the composite material is still not ideal. After 200 cycles, the capacity decays by nearly 50%.

Method used

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  • Battery, battery cathode, battery cathode material and preparation method thereof
  • Battery, battery cathode, battery cathode material and preparation method thereof
  • Battery, battery cathode, battery cathode material and preparation method thereof

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preparation example Construction

[0055] The invention also discloses a method for preparing the negative electrode material of the battery. The negative electrode material includes active material elemental silicon (Si), reduced graphene oxide (RGO), and polyaniline (PANi).

[0056] Specifically, the preparation method mainly adopts an in-situ polymerization method to prepare polyaniline and reduced graphene oxide double-coated silicon-based composite materials. In-situ polymerization is a kind of adding reactive monomer (or its soluble prepolymer) and catalyst into the dispersed phase (or continuous phase), and the core material is the dispersed phase. Since the monomer (or prepolymer) is soluble in a single phase, and its polymer is insoluble in the whole system, the polymerization reaction occurs on the core material of the dispersed phase. At the beginning of the reaction, the monomers are prepolymerized, and the prepolymers are polymerized. When the size of the prepolymers gradually increases, they are d...

Embodiment 1

[0077] Preparation of n-Si / PANi / RGO

[0078] First, add 0.3 g of nano-silicon (n-Si) particles, 0.5 g of surfactant dodecyltrimethylammonium bromide (DTBA) and 0.375 ml of n-butanol to 100 ml of deionized water, and ultrasonically disperse the above mixture for 30 minutes to obtain Homogeneous brown suspension.

[0079]A solution of 0.3 ml (3.3 mmol) of aniline monomer in 30 ml of HCl (pH=1) was then added dropwise to the brown suspension while stirring. The above mixture was stirred in an ice bath, and at the same time, 10 ml of deionized water in which 0.19 g (0.825 mmol) of ammonium persulfate was dissolved was slowly added dropwise thereto, which as an oxidizing agent could enable in-situ polymerization of aniline monomers. The polymerization process lasted for 12 hours, and a mixture of green and brown mixed colors of polyaniline and nano-silicon (n-Si / PANi) solution was obtained.

[0080] Take a reaction container, add 0.8g natural graphite and 23ml concentrated sulfur...

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Abstract

The invention relates to a battery cathode material and a preparation method thereof. The cathode material at least comprises the active material elemental silicon and reduced graphene oxide, and also includes polyaniline. Also, the elemental silicon has the double cladding layer of polyaniline and reduced graphene oxide. On the one hand, the special internal structure of polyaniline can well inhibit huge volume change of silicon particles in a charge-discharge process, thus improving the cycle performance of the battery; and on the other hand, both polyaniline and graphene have excellent electrical conductivity, and can significantly improve the charge-discharge capacity of the material. The invention also relates to a battery cathode and a battery containing the cathode material. The battery cathode and the battery provided by the invention have high charge-discharge capacity and good cycle performance, thus being suitable for various mobile electronic equipment.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, more specifically, to a battery negative electrode material and a preparation method thereof, a battery negative electrode containing the negative electrode material, and a battery assembled from the negative electrode. Background technique [0002] As a high-energy-density battery in the prior art, lithium-ion batteries have been extensively studied by industry personnel. It has the advantages of light weight, small size, high discharge voltage, long cycle life, no memory effect, and small self-discharge. , Has been widely used in mobile phones, digital cameras, notebook computers and other portable electronic devices. However, there are still many technical bottlenecks in lithium-ion batteries at present, such as poor charge and discharge performance at high rates, insufficient energy density, and low safety performance. Therefore, large-scale development and application of lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M10/0525
CPCB82Y30/00H01M4/13H01M4/366H01M4/386H01M4/587H01M4/606H01M4/625H01M10/0525Y02E60/10
Inventor 李恺陈璞
Owner POSITEC POWER TOOLS (SUZHOU) CO LTD
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