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High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode

A lithium-ion battery, high-voltage technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low specific energy of lithium-ion battery cathode and low discharge voltage platform, and achieve easy large-scale industrial production and discharge voltage. The effect of high platform and high specific energy

Active Publication Date: 2011-06-08
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low specific energy and low discharge voltage platform of existing lithium-ion batteries and their positive poles, the purpose of the present invention is to provide a high-voltage lithium-ion battery positive pole and a lithium-ion battery using such a positive pole

Method used

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  • High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode
  • High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode
  • High-voltage lithium ion battery anode, lithium ion battery using same and preparation method of high-voltage lithium ion battery anode

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preparation example Construction

[0047] The preparation method of the positive electrode is

[0048] Disperse the binder evenly in the solvent first,

[0049] Then make a mixture of the positive electrode active material and the conductive agent, add it into a container with an inert atmosphere of nitrogen or argon, and ball mill it. After it is fully ground and mixed uniformly, add it to the solvent, and mix it evenly to obtain a slurry. The obtained slurry is coated on the aluminum foil of the current collector, dried, rolled, and cut to obtain the above-mentioned positive electrode.

[0050] The solvent is N-methylpyrrolidone.

[0051] The lithium-ion battery provided in this embodiment includes a positive electrode, a negative electrode, a separator interposed between the positive electrode and the negative electrode, an electrolyte, and a battery casing. The separator is polyethylene, polypropylene or a composite film of polyethylene and polypropylene, which is inserted between the positive electrode a...

Embodiment 1

[0060] This embodiment is used to prepare the positive electrode of the high-voltage lithium-ion battery of this embodiment

[0061] By mass percentage, 91% of the positive electrode active material LiNi 0.5 mn 1.5 o 4 / C, 2.5% super conductive carbon black, 2.5% super conductive graphite, 4% binder polyvinylidene fluoride, using N-methylpyrrolidone as a solvent, first uniformly disperse the binder in the solvent; then The conductive agent and the positive electrode active material are mixed and stirred evenly, then dispersed in the solvent, stirred, and mixed uniformly to form a slurry. Using 19 μm thick aluminum foil as a current collector, evenly coat the slurry on the aluminum foil, control the temperature at 125°C and dry for 8 hours, and the coating surface density of the positive electrode is 31mg / cm 2 .

[0062] The pole pieces were rolled and dried in an inert argon atmosphere at 115° C. for 12 hours, and then cut to make positive electrodes.

Embodiment 2

[0064] This embodiment is used to prepare the positive electrode of the high-voltage lithium-ion battery of this embodiment

[0065] By mass percentage, 86% of the positive electrode active material LiNi 0.5 mn 1.5 o 4 / C material, 3.75% superconducting carbon black, 3.75% conductive graphite, 6.5% binder polyvinylidene fluoride, using N-methylpyrrolidone as a solvent, first uniformly disperse the binder in the solvent; then The conductive agent and the positive electrode active material are mixed and stirred evenly, then dispersed in the solvent, stirred, and mixed uniformly to form a slurry. A 25 μm thick aluminum foil was used as a current collector, the slurry was coated on the aluminum foil, and the temperature was controlled at 125° C. for 8 h. The coated surface density of the positive electrode is 26 mg / cm 2 .

[0066] The pole pieces were rolled and dried at 110° C. for 12 hours under an inert nitrogen atmosphere, and then cut to make positive electrodes.

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Abstract

The invention relates to a high-voltage lithium ion battery anode, a lithium ion battery using the same and a preparation method of the high-voltage lithium ion battery anode. The high-voltage lithium ion battery anode comprises a current collector, an anode active substance material, a conduction agent and a binder, wherein 85-95wt% of anode active substance material, 2.5-7.5wt% of conduction agent and 2.5-7.5wt% of binder are prepared into a sizing agent; and the sizing agent is coated on the current collector. The lithium ion battery anode in the invention and the lithium ion battery usingthe anode have the advantages of high discharging voltage platform, high specific energy and low cost and are easy for large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery energy, in particular to a positive electrode of a high-voltage lithium-ion battery, a lithium-ion battery using the positive electrode, and a preparation method. Background technique [0002] Since the advent of lithium-ion batteries, they have been favored by the majority of users due to their high voltage and high specific energy, and have also attracted the attention of many researchers. Especially in the 21st century, with the rapid development and wide application of various portable electronic devices, wireless mobile communication devices, and electric vehicles, the demand for lithium-ion batteries with higher specific capacity, long cycle life, and low cost appears to be even greater. urgent. [0003] The key to improving the high specific energy index of lithium-ion batteries lies in the development of high specific energy positive electrode materials and the design of posit...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/505H01M4/62H01M10/0525H01M4/139
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 翟丽娟朱广燕刘志远
Owner CHERY AUTOMOBILE CO LTD
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