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Lithium ion battery positive electrode material and lithium ion battery using it

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor storage performance, high expansion rate, and large gas production

Inactive Publication Date: 2012-03-07
SHANDONG VOTSEN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problems of nickel-manganese-cobalt-lithium-manganese oxide, one of the positive electrode materials for lithium-ion batteries, in high-temperature environments with large gas production, high expansion rate, and poor storage performance in high-temperature environments above 60 degrees

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0041] The present invention will be described in detail below based on specific test results.

[0042] Mix nickel, manganese and cobalt salts with single-crystal lithium carbonate and sinter at 850°C for 24 hours, then pulverize with a mortar. Alternatively, mix the precursor containing nickel, cobalt and manganese with single crystal lithium carbonate and sinter at 850°C for 24 hours, and then pulverize with a mortar.

[0043]Copper foil is used as the current collector of the negative electrode, aluminum foil is used as the current collector of the positive electrode, the sintered positive electrode material is used as the positive electrode active material, and MCMB is used as the negative electrode active material. The battery model is square 633770. Lithium cobaltate was mixed with 5% binder PVDF and 4% conductive carbon black, and added to N-methylpyrrolidone at a ratio of 1:1. The negative electrode material can be directly mixed with 10% binder PVDF and added in a r...

Embodiment 1

[0047] A plurality of lithium-ion batteries with 633770 square aluminum shells are made according to the above method, the battery active material is lithium nickel manganese oxide, the median diameter of its particle size is 4 microns, and its particle morphology is not small as analyzed from the electron microscope image The particles are agglomerated into a secondary spherical type and are single crystal particles. The battery expansion rate of the fabricated battery is 17.3% under the high-temperature storage condition of 85 degrees for 4 hours under the state of 4.2V.

[0048] The above experimental results show that for lithium nickel manganese oxide, when the median diameter of the positive electrode material is greater than 4 microns, and its particle morphology is not a secondary spherical type of small particles agglomerated from the electron microscope image, it is a single crystal particles.

[0049] The material has good high-temperature storage performance at a ...

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Abstract

The invention provides a lithium ion battery positive electrode material with a stable high temperature performance. The material at least contains three metallic elements: nickel, cobalt and manganese. The median diameter of the material is measured to be greater than 2 micrometers by a laser particle size method, and through analysis of a scanning electron micrograph, the particle appearance of the material is in the form of single crystal particles rather than secondary balls aggregated by small particles. And the positive electrode material has a specific surface area less than 0.7sqm / g. The invention also provides a lithium ion battery using the material provided in the invention. The lithium ion battery of the invention has the characteristics of high volumetric specific energy and good high temperature performance.

Description

technical field [0001] The invention relates to a positive electrode material for a lithium ion battery and a lithium ion battery made of the positive electrode material. Background technique [0002] Since lithium-ion batteries were commercialized in 1991, the cathode materials used in them have also been continuously improved. The earliest positive electrode material used in lithium-ion batteries is mainly lithium cobalt oxide. Its main disadvantages are high price and small increase in capacity, which makes it difficult to meet the market's demand for higher energy. New materials need to be developed to meet the requirements for their further use. To this end, some new positive electrode materials have been developed, mainly including the following: lithium manganese oxide, lithium nickel cobalt manganese oxide, and lithium nickel cobalt oxide. Its performance in practical application is compared with lithium cobalt oxide as follows: [0003] 1. Gram capacity: [0004...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 刘立健林军孙杰
Owner SHANDONG VOTSEN NEW ENERGY TECH
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