Negative electrode material, negative electrode plate, electrochemical device and electronic device

A negative electrode material and carbon material technology, applied in the field of electronics, can solve the problem that the improvement effect is unsatisfactory, and achieve the effect of improving cycle performance

Active Publication Date: 2021-07-30
NINGDE AMPEREX TECH
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current improvement effect is unsatisfactory

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
  • Negative electrode material, negative electrode plate, electrochemical device and electronic device
  • Negative electrode material, negative electrode plate, electrochemical device and electronic device
  • Negative electrode material, negative electrode plate, electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of the negative electrode sheet: the current collector is made of copper foil with a thickness of 10 μm; the active material is made of SiO x (0.5≤x≤1.6) and graphite, SiO x and the D / G values ​​of graphite are shown in Table 1, where SiO x The mass ratio of the active material is 10%; the binder is polyacrylic acid; the active material, conductive carbon black, and binder are mixed according to the mass ratio of 95:1.2:3.8 and dispersed in water to form a slurry, which is stirred and coated After drying on copper foil, cold pressing and slitting, the negative electrode sheet is obtained.

[0048] Preparation of positive electrode sheet: take the positive active material LiCoO 2, conductive carbon black, binder polyvinylidene fluoride (PVDF) according to the mass ratio of 96.7:1.7:1.6 in the N-methylpyrrolidone solvent system after fully stirring and mixing evenly, coated on the aluminum foil, and then dried, Cold pressing to obtain the positive electrode...

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

No PUM Login to View More

Abstract

The invention discloses a negative electrode material, a negative electrode plate, an electrochemical device and an electronic device. The negative electrode material comprises a silicon-based material and a carbon material, peaks with displacement ranges of 1255-1355 cm<-1> and 1575-1600 cm<-1> in a Raman spectrum of the carbon material are respectively a peak D and a peak G, peaks with displacement ranges of 1255-1355 cm<-1> and 1575-1600 cm<-1> in a Raman spectrum of the silicon-based material are respectively a peak D and a peak G, a scattering peak intensity ratio D / G of the carbon material is A, a scattering peak intensity ratio D / G of the silicon-based material is B, 0.15<=A<=0.9, 0.8<=B<=2.0, and 0.2<B-A<1.8. By selecting the silicon-based material and the carbon material in the negative electrode material with proper Raman spectrum intensity, the cycle performance, the deformation rate and the rate capability of the electrochemical device are remarkably improved.

Description

technical field [0001] The disclosure relates to the field of electronic technology, and in particular to a negative electrode material, a negative electrode sheet, an electrochemical device and an electronic device. Background technique [0002] Silicon-based materials have a theoretical specific capacity as high as 4200mAh / g, and are promising anode materials for next-generation electrochemical devices (eg, lithium-ion batteries). However, silicon-based materials have a volume expansion of about 300% during charge and discharge, and are less conductive. For this reason, the industry usually adopts a mixture of silicon-based materials and graphite materials in a certain proportion, but even so, it is still difficult to meet people's increasing demand for capacity density and dynamics. [0003] At present, researchers mainly improve the anode kinetics and reduce the expansion of the electrode assembly during cycling by improving the interfacial stability and conductivity of...

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): H01M4/36H01M4/38H01M4/583H01M4/62H01M4/66
CPCH01M4/362H01M4/583H01M4/625H01M4/386H01M4/667Y02E60/10H01M4/483H01M2004/027H01M10/0525H01M4/134H01M4/131H01M4/0404H01M4/1393H01M4/1395H01M4/364H01M4/366H01M4/587H01M4/661H01M2004/021
Inventor廖群超崔航谢远森王超
OwnerNINGDE AMPEREX TECH