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Positive pole material and lithium ion battery

A technology of positive electrode materials and positive active materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as complex processes, potential safety hazards, and harsh conditions, and achieve simple preparation processes, high safety, electronic conductivity and The effect of improving stability

Active Publication Date: 2016-06-22
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of complex process, harsh conditions and potential safety hazards in the existing technology of lithium ion battery negative electrode SEI film consumption and lithium supplementation

Method used

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  • Positive pole material and lithium ion battery
  • Positive pole material and lithium ion battery
  • Positive pole material and lithium ion battery

Examples

Experimental program
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Effect test

preparation example Construction

[0024] The preparation method of the positive electrode can adopt various methods commonly used in the art, such as using a solvent to prepare the positive electrode material provided by the invention into a positive electrode material slurry. The amount of solvent added is well known to those skilled in the art. Cloth viscosity and workability requirements are adjusted. Then the prepared positive electrode material slurry is drawn and coated on the positive electrode current collector (any positive electrode current collector known in the art can be used, such as aluminum foil), dried and pressed, and then cut into pieces to form the lithium ion battery positive electrode. The selection range of the drying temperature may be 90-150° C., and the drying time may be 10-40 minutes.

[0025] The solvent can be various solvents known in the art, preferably N-methylpyrrolidone (NMP), N,N-dimethylformamide (DMF), N,N-diethylformamide (DEF) One or more of , dimethyl sulfoxide (DMSO),...

Embodiment 1

[0031] Will Li 2 O, Fe 2 o 3 and Al 2 o 3 Mix according to the molar ratio of 5:0.95:0.05, place in a stirring ball mill and mix and grind for 8 hours; the precursor prepared by fully mixing and grinding is pressed on a tablet machine, and then placed in a boron nitride box; put the box into In a tube furnace, nitrogen protection was introduced, and heating was started from room temperature at a heating rate of 5 °C / min. After heating to 850 °C, roasting for 48 hours, and then naturally cooling to room temperature, the additive S1 of this example was prepared, and its chemical formula was Li 5 Fe 0.95 Al 0.05 o 4 , its XRD spectrum is shown in figure 1 , SEM image see figure 2 .

Embodiment 2

[0033] Will Li 2 CO 3 , Fe 2 o 3 and Al(OH) 3 Mix according to the molar ratio of 5:0.9:0.2, place in a stirring ball mill for mixing and grinding for 6 hours; press the precursor prepared by fully mixing and grinding on a tablet machine, and then place it in a boron nitride box; put the box into In a tube furnace, nitrogen protection was introduced, and heating was started from room temperature at a heating rate of 5°C / min. After being heated to 800°C, it was roasted for 72 hours, and then naturally cooled to room temperature to obtain the additive S2 of this example, whose chemical formula was Li 5 Fe 0.9 Al 0.1 o 4 , its SEM image is shown in image 3 .

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PUM

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Abstract

The invention provides a positive pole material and a lithium ion battery prepared from the positive pole material. The positive pole material contains a positive pole active substance and an additive. The additive is Li5Fe1-xAlxO4, wherein x is greater than or equal to 0.05 and less than or equal to 0.3. Through use of the specific additive Li5Fe1-xAlxO4 in the positive pole material, the irreversible capacity of active lithium of the additive Li5Fe1-xAlxO4 supplies lithium for a negative pole SEI film subjected to Li consumption. The additive has no requirement on the type of the positive pole active substance and has a wide application range. The lithium ion battery with the positive pole material has simple preparation processes, a low cost, high safety and high battery energy density.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, in particular to a positive electrode material and a lithium ion battery using the positive electrode material. Background technique [0002] Lithium-ion batteries have become one of the most widely used secondary batteries due to their advantages of high voltage, high energy density and long cycle life. However, with the continuous development of miniaturization and long standby time of portable electronic devices, and the use of high-power and high-energy devices such as electric bicycles and electric vehicles, the energy density of lithium-ion batteries as energy storage power sources is getting higher and higher. requirements. [0003] For the negative electrode sheet, part of the lithium will be consumed due to the formation of the solid electrolyte film (SEI film) during the first charging process of the battery, resulting in the loss of lithium in the positive electrode material, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCY02E60/10
Inventor 焦晓朋张百爽李世彩
Owner BYD CO LTD
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