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Positive electrode material of lithium ion battery as well as preparation method and application of positive electrode material

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve structural defects, cannot eliminate and improve lithium ion safety performance and electrochemical performance and other problems, so as to improve service life, improve Effects of ionic conductivity and safety improvement

Pending Publication Date: 2019-06-14
高点(深圳)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem solved by the present invention is: Although the existing positive electrode materials for lithium-ion batteries are improved in different ways to improve the safety performance and electrochemical performance of the prepared lithium-ion batteries during use, due to the structural defects of the bulk material, and It is impossible to fundamentally eliminate and improve the safety performance and electrochemical performance of lithium ions, so it is urgent to develop a new simple and feasible improvement method

Method used

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  • Positive electrode material of lithium ion battery as well as preparation method and application of positive electrode material
  • Positive electrode material of lithium ion battery as well as preparation method and application of positive electrode material
  • Positive electrode material of lithium ion battery as well as preparation method and application of positive electrode material

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preparation example Construction

[0069] In another preferred embodiment, the present invention provides a method for preparing a positive electrode material for a lithium ion conductor battery, which is characterized in that it includes the preparation of a nano-lithium ion conductor precursor, mixing with the positive electrode body material and the lithium ion conductor crystal of the positive electrode material. Boundary sintering fusion and other processes. Its preparation method is as follows.

[0070] 1) Mix and dissolve the precursor lithium salt, fast ion conductor raw materials, and water-based polyketone resin, and then prepare a slurry after high-speed dispersion and mixing. Then selectively add or not add a small amount of lithium salt to the slurry, dry the slurry at 80-150° C. for 1-10 hours to dehydrate, keep the water content at 5-20%, and obtain the fast ion conductor precursor.

[0071] 2) Composite drying. Prepare the sol according to the weight ratio of deionized water: CMC = 100: (0.2-4),...

Embodiment 1

[0098] Weigh 23.3kg of lithium hydroxide monohydrate and add it to a 500L coulter mixer, start stirring and add 100kg of polyvinylpyrrolidone and 40kg of deionized water, and then add 91.6kg of titanium dioxide and 105.85kg of lanthanum hydroxide after stirring fully. Stir for 50 minutes and then transfer to a tray and bake in an oven at 105° C. for 2 hours to keep the moisture content of the material at about 5% to obtain a fluffy fast ion conductor solid material 1 .

[0099] Add 120kg of deionized water to the kneader, then add 1.2kg of sodium carboxymethylcellulose to dissolve completely, then add 100kg of lithium cobaltate positive electrode material and stir for 20 minutes, then add 10kg of solid material 1, after mixing for 30 minutes, pour the slurry Put it into a tray and put it in a drying oven to dry at 120°C / 10h to obtain a solid block material.

[0100] The above-mentioned dried material is packed into a ceramic bowl, and a 24m roller kiln is used to feed oxygen-e...

Embodiment 2

[0106] Weigh 42.6kg of lithium carbonate and add it to a 500L kneader, start stirring and add 30kg of polyvinylpyrrolidone and 40kg of deionized water, and then add 34.29kg of metatitanic acid and 52.61kg of lithium titanate (Li 4 Ti 5 o 12 ), and 17.94kg aluminum hydroxide. Stir the material for 50 minutes, then transfer it to a tray, put it in an oven and bake at 150° C. for 1.5 hours, and keep the moisture content of the material at about 20% to obtain block-shaped solid material 2 .

[0107] Add 120kg of deionized water to the kneader, then add 1.2kg of sodium carboxymethylcellulose to dissolve completely, then add 100kg of lithium manganate positive electrode material and stir for 20 minutes, then add 20kg of solid material 2, after mixing for 30 minutes, pour the slurry Put it into a tray and put it in a drying oven to dry at 150°C / 10h to obtain a solid block material.

[0108] The above-mentioned dried materials are packed into a ceramic bowl, and a 24m roller kiln i...

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Abstract

The invention relates to a positive electrode material of a lithium ion battery. The positive electrode material comprises a basic material and a fast ion conductor coating layer, wherein the coatinglayer is selected from a lithium-titanium composite oxide, a lithium-zirconium composite oxide or a lithium-phosphorus composite compound, wherein the basic material is selected from one or more thantwo of lithium cobalt oxide, lithium nickel cobalt aluminate, lithium nickel cobalt manganate, lithium manganate, lithium iron phosphate, lithium nickel manganate or lithium nickel cobalt oxide; the preparation method comprises the following stepsof preparing the raw materials containing elements in the fast-ion conductor into a precursor, and then carrying out surface fusion with the basic material, and the solid coating film is formed by sintering, so that the ion migration capacity is improved, and the decomposition reaction of the transition element to the electrolyte is reduced, the cyclelife of the prepared lithium ion battery is prolonged, the safety is improved, and the positive electrode material has a wide application prospect.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery cathode material and its preparation method and application. Background technique [0002] Lithium ion conductors, as another important member of alkali metal ion conductors, have developed rapidly since the 1970s. From the late 1970s to the early 1980s, people successively discovered that the solid solution composed of lithium oxide and other metal oxides has a high lithium ion conductivity, which is expected to form a new type of material used in lithium ion batteries. [0003] Due to the advantages of high energy density, high working voltage, and long cycle life, lithium-ion batteries are widely used as power sources for various mobile devices, and even gradually replace other batteries in the fields of aviation, aerospace, navigation, automobiles, and medical equipment. conventional battery. The lithium electrolyte of the traditional lithium-ion s...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCY02E60/10
Inventor 赵孝连曾国城鲍荣闵婷婷农廷峰
Owner 高点(深圳)科技有限公司
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