Check patentability & draft patents in minutes with Patsnap Eureka AI!

Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, lithium storage batteries, negative electrodes, etc., can solve problems such as low first coulomb efficiency, and achieve the effects of simple and economical method, excellent cyclic expansion performance, and reduced generation amount.

Active Publication Date: 2018-05-18
BTR NEW MATERIAL GRP CO LTD
View PDF5 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] For existing SiO x The problem that the first coulombic efficiency of the negative electrode material is low, the object of the present invention is to provide a kind of lithium ion battery negative electrode material and its preparation method, especially a kind of lithium ion battery silicon oxide negative electrode material and its preparation method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] SiO y Preparation of:

[0078] (1) Take 880g SiO2 x matrix composite (which is made of amorphous carbon coating and commercially available SiO x (x = 1) formed composite material, and amorphous carbon accounted for 3wt% of the composite material) and 120g Mg powder, that is, the ratio of Mg to the mixture is 12%, put into VC mixer and mix for 30min, then drop into 0.1MPa Ar atmosphere treated in a box furnace at 1000°C for 12h to obtain the product (reduced SiO y materials and compounds of Mg).

[0079] (2) Using HCl to acid-treat the product obtained in step (1) for 2 hours, then filtering to separate the acid solution, and then drying the filter residue at high temperature to obtain a lithium-ion battery negative electrode material.

[0080] Characterization results:

[0081] The O content was obtained by using an N / H / O analyzer to characterize, and in the lithium ion battery negative electrode material obtained in this embodiment, y=0.37.

[0082] X-ray diffrac...

Embodiment 2

[0086] SiO y Preparation of:

[0087] Except the following content, other conditions are identical with embodiment 1:

[0088] Take 960g SiO x matrix composite (which is made of amorphous carbon coating and commercially available SiO x (x = 1) formed composite material, and the amorphous carbon accounted for 3 wt% of the composite material) was tested with 40 g of Mg powder, that is, the proportion of Mg in the mixture was 4%.

[0089] Characterization results:

[0090] The O content was obtained by using an N / H / O analyzer to characterize, and in the lithium ion battery negative electrode material obtained in this embodiment, y=0.78.

[0091] X-ray diffractometer characterizes SiO y The Si crystallite grain size is 4.5nm.

[0092] It assembled the material into a button battery for characterization, and its initial capacity was 1465mAh / g, and its initial efficiency was 80.1%.

[0093] The material is mixed with graphite and then assembled into a button battery. The 50-w...

Embodiment 3

[0095] SiO y Preparation of:

[0096] Except the following content, other conditions are identical with embodiment 2:

[0097] SiO x After mixing with Mg through VC mixer, put 0.1MPa N 2 Atmosphere chamber furnace at 1000°C for 12h.

[0098] Characterization results:

[0099] The O content was obtained by using an N / H / O analyzer to characterize, and in the lithium ion battery negative electrode material obtained in this embodiment, y=0.79.

[0100] X-ray diffractometer characterizes SiO y The Si crystallite grain size is 4.6nm.

[0101] It assembled the material into a button battery for characterization, and its initial capacity was 1471mAh / g, and its initial efficiency was 79.9%.

[0102] The material is mixed with graphite and then assembled into a button battery. The 50-week capacity retention rate is 97%, and the pole piece expansion rate is 42%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Specific surface areaaaaaaaaaaa
Sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof. The negative electrode material comprises SiO<y> and an M compound, wherein y is more than 0.2 but less than 0.9, and M is metal. The method comprises the steps of performing oxidization-reduction reaction of a raw material containing a SiO<x> material and the metal M, adjusting x of O / Si ratio of the SiO<x> material (0.5<x<1.5) to be y (0.2<x<0.9), and simultaneously oxidizing the metal M to obtain the M compound. The negative electrode material has relatively high initial coulombic efficiency, the O content of a negative electrode is reduced, so that the generation quantity of irreversible phases Li2O and Li4SiO4 during initial lithium intercalation is reduced; the material has excellent cycle expansion performance, and the development of a high-energy density battery is facilitated; and moreover, the raw material and the equipment which are employed by the method are common and available, the method is moderate in reaction condition and is simple and economic, and industrialization is easily achieved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode materials, and relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a lithium ion battery silicon oxide negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of electric vehicles and other electronic products, higher and higher requirements are placed on electric energy storage. Lithium-ion battery has become an ideal portable battery due to its high working voltage, light weight, small self-discharge, long cycle life, no memory effect, no environmental pollution and good safety performance. At present, commercial lithium-ion batteries mainly use graphite as the anode material, which has only a theoretical specific capacity, which cannot meet the growing needs of the future energy storage field. It is urgent to develop a new generation of high-performance...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/0525
CPCH01M4/386H01M4/483H01M10/0525H01M4/362H01M4/628H01M2004/027H01M2004/021H01M4/366Y02E60/10H01M4/62H01M4/625H01M4/131C01P2006/12C01P2006/40C01B33/113H01M10/052H01M4/587
Inventor 梁腾宇庞春雷任建国岳敏
Owner BTR NEW MATERIAL GRP CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com