Unlock instant, AI-driven research and patent intelligence for your innovation.

Negative pole active material and preparation method thereof, negative pole piece and battery core

A negative electrode active material and negative electrode sheet technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of few applications in the field of consumer electronics, low charge and discharge capacity of lithium titanate, limited energy density, etc., to achieve superior Effect of electronic conductivity, improvement of safety performance of hot box, and high oxygen reduction activity

Inactive Publication Date: 2018-06-12
NINGDE AMPEREX TECH
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the charge and discharge capacity of lithium titanate is low, so the energy density is limited, and the problem of battery cell swelling in the charge and discharge process of lithium titanate has been rarely used in the field of consumer electronics.

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 pole active material and preparation method thereof, negative pole piece and battery core
  • Negative pole active material and preparation method thereof, negative pole piece and battery core

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] Next, the preparation method of the negative electrode active material according to the second aspect of the present invention is described, which is used to prepare the negative electrode active material described in the first aspect of the present invention, comprising the steps of: (1) dissolving the lanthanum salt, the strontium salt, and the manganese salt respectively in the and mixed in ionic water to form a mixed solution; (2) adding a chelating agent and a buffer to the mixed solution for gelation reaction to obtain a lanthanum strontium manganese oxygen wet gel; (3) adding titanium to the lanthanum strontium manganese oxygen wet gel Lithium oxide powder, then dried and sintered to complete the preparation of the negative electrode active material, wherein the obtained negative electrode active material includes a lithium titanate core and a coating layer coated on the surface of the lithium titanate core, the coating The coating is selected from lanthanum stron...

Embodiment 1

[0042] (1) Preparation of negative electrode sheet

[0043] Lanthanum nitrate, strontium nitrate, and manganese nitrate are dissolved in deionized water according to the molar ratio of La, Sr, and Mn of 0.7:0.3:1, and a mixed solution with a total ion concentration of La, Sr, and Mn of 1mol / L is prepared, and then Add citric acid (the ratio of the moles of citric acid to the sum of La, Sr, and Mn ion moles is 2.5:1) and ammonium bicarbonate for gelation reaction to obtain lanthanum strontium manganese oxygen wet gel, wherein the reaction temperature The temperature is 80°C, the pH of the reaction system is 3, and the reaction time is 5h-10h. According to the coating ratio of 0.1% (that is, the quality of the finally obtained lanthanum strontium manganese oxide is 0.1% of the mass of lithium titanate), add commercial lithium titanate powder to the lanthanum strontium manganese oxide wet gel, and then bake dry, and after the solvent deionized water is fully volatilized, the obt...

Embodiment 2

[0052] A lithium-ion battery was prepared according to the method of Example 1, with the difference that: the coating ratio was 0.5%, and the thickness of the coating layer was about 0.15 μm.

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a negative pole active material and a preparation method thereof, a negative pole piece and a battery core. The negative pole active material comprises a lithium titanate innercore and a coating layer, wherein the surface of the lithium titanate inner core is coated with the coating layer, and the coating layer is made of lanthanum strontium manganese oxide. The battery core provided by the invention can achieve the effect of giving consideration to high-energy density and high-ratio rapid charging, and has relatively high high-temperautre and low-temperature circulating performance and hot box safety performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a negative electrode active material, a preparation method thereof, a negative electrode sheet and an electric core. Background technique [0002] As the most representative energy storage device in the field of new energy, lithium-ion batteries occupy an irreplaceable position in the fields of mobile electronics, power batteries and energy storage power stations. Especially in the field of consumer electronics, there are higher requirements for the fast charging and discharging performance and capacity of lithium-ion batteries. However, currently widely used lithium-ion batteries that use graphite as the negative electrode active material are prone to problems such as lithium deposition at the negative electrode during fast charging, which brings great safety hazards to lithium-ion batteries. At the same time, in terms of positive electrode active materials, the substantial i...

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): H01M4/485H01M4/36H01M4/505H01M4/48H01M10/0525
CPCH01M4/366H01M4/48H01M4/485H01M4/505H01M10/0525Y02E60/10
Inventor 郎野崔静
Owner NINGDE AMPEREX TECH