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Quick-charging graphite and battery

A graphite and battery technology, applied in the field of fast-charging graphite and batteries, to achieve the effects of stable capacity, good dynamic performance, and high capacity

Pending Publication Date: 2020-12-29
JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are few studies on other characteristics related to graphite diffusion kinetics, such as graphitization degree g and lithium ion diffusion coefficient D.

Method used

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  • Quick-charging graphite and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of negative electrode sheet:

[0045] Mix fast-charging graphite, aqueous dispersion of acrylonitrile multi-polymer copolymer (LA133), sodium carboxymethylcellulose (CMC) and conductive carbon black (SP) according to the mass ratio of 96.2:1.5:1.5:0.8 and add water as A slurry was prepared with a solvent, coated on a copper foil, dried and cold-pressed to a compacted density of 1.65g / cc. The degree of graphitization g of fast-charging graphite is 92.3%, and the lithium ion diffusion coefficient D of fast-charging graphite at 25°C and 10% SOC is 6×10 -12 cm 2 / s.

[0046] Preparation of positive electrode sheet:

[0047] Mix the positive electrode material NCM523, polyvinylidene fluoride binder (PVDF), conductive carbon black (SP), and carbon nanotubes (CNT) according to the mass ratio of 97.8:0.9:0.8:0.5 and add NMP as a solvent to prepare slurry , and coated on aluminum foil, dried and cold-pressed to a compacted density of 3.4g / cc.

[0048] The prepar...

Embodiment 2

[0050] The difference with embodiment 1 is:

[0051] The degree of graphitization g of fast-charging graphite is 93.1%, and the lithium ion diffusion coefficient D of fast-charging graphite at 25°C and 10% SOC is 4.6×10 -12 cm 2 / s.

[0052] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0054] The difference with embodiment 1 is:

[0055] The degree of graphitization g of fast-charging graphite is 94.2%, and the lithium ion diffusion coefficient D of fast-charging graphite at 25°C and 10% SOC is 8.6×10 -13 cm 2 / s.

[0056] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to quick-charging graphite, the graphitization degree g of the quick-charging graphite is 90%-97%, and the lithium ion diffusion coefficient D of the quick-charging graphite under the conditions of 25 DEG C and 10% SOC is 2.3*10<-14> cm<2> / s to 8.7*10<-12> cm<2> / s. Furthermore, the invention also relates to a battery which comprises a positive plate, a negative plate, a diaphragm arranged between the positive plate and the negative plate at intervals, and an electrolyte, the negative plate comprises a negativecurrent collector and a negative material layer applied on at least one surface of the negative current collector, and the negative material layer comprises a negative active substance. The negative active substance comprises the quick-charging graphite disclosed by the invention. Compared with the prior art, a graphite material provided by the invention has good fast charging performance, and thebattery prepared from the graphite has excellent dynamic performance, charging capability and cycle life.

Description

technical field [0001] The invention belongs to the technical field of batteries, in particular to a fast-charging graphite and a battery. Background technique [0002] With the continuous upgrading of material development technology and cell manufacturing technology, the energy density of power batteries has increased significantly. At present, the cruising range of mainstream mass-produced passenger cars has increased from 150km in the early stage to 400km, which can basically meet the cruising range requirements of consumers. However, charging speed, as another important factor affecting user experience, has been criticized by consumers. [0003] During fast charging, lithium ions need to be embedded in the layered structure of the graphite negative electrode in a short time. If the kinetics of graphite is poor, lithium ions will not have time to intercalate into the graphite bulk phase to form Li x C compound, and precipitated on the surface of the pole piece to form li...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/04C01B32/20
CPCH01M4/583H01M4/0404C01B32/20Y02E60/10H01M4/5825H01M10/0525H01M4/364H01M4/133H01M4/36H01M4/525H01M4/505H01M2004/021H01M4/366H01M4/625H01M4/485H01M4/136H01M4/131H01M10/052H01M4/134H01M4/386H01M2004/027H01M4/661H01M4/587H01M4/667
Inventor 张传健张浩刘娇唐文江柯成姚毅
Owner JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD