Ultralow-temperature lithium ion battery composite positive electrode material and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor low-temperature performance of lithium-ion batteries and cannot meet the market demand of electric vehicles, and achieve excellent low-temperature performance and high Coulombic efficiency , the effect of high specific capacity

Inactive Publication Date: 2017-10-24
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to provide an ultra-low temperature lithium-ion battery composite positive electrode material and its preparation method in order to solve the technical problem that the low-temperature performance of the current lithium-ion battery is poor and cannot meet the market demand of electric vehicles

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  • Ultralow-temperature lithium ion battery composite positive electrode material and preparation method thereof
  • Ultralow-temperature lithium ion battery composite positive electrode material and preparation method thereof

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preparation example Construction

[0035] The present invention also provides a method for preparing an ultra-low temperature lithium-ion battery composite positive electrode material, comprising the following steps:

[0036] Step 1: preparing nickel cobalt lithium manganese oxide positive electrode material;

[0037] Step 2: adding the nickel-cobalt lithium manganese oxide cathode material obtained in step 1 into the polymer material solution and stirring to obtain a composite cathode material for an ultra-low temperature lithium-ion battery;

[0038] The polymer material solution is one or more of polypyrrole, polyaniline, diazonium salt, polyethylene dioxythiazide / polyethylene glycol solution; the diazonium salt is preferably heavy tetrafluoroborate Azobenzene.

[0039] According to the present invention, the preparation method of described nickel cobalt lithium manganese oxide positive electrode material preferably comprises:

[0040] (1) Dissolve nickel salt, cobalt salt, and manganese salt in deionized ...

Embodiment 1

[0055] Weigh nickel sulfate, cobalt sulfate, and manganese sulfate respectively in a molar ratio of 6:2:2, and dissolve them in deionized water to prepare a total concentration of 2mol / L, and pass an inert gas to remove oxygen for 30 minutes; prepare 4mol / L sodium hydroxide as Precipitating agent, 2mol / L ammonia water as complexing agent, pass N 2 Remove oxygen for 40 minutes; prepare a 2mol / L ammonia solution as the bottom liquid and first add it to the reaction kettle, and pass N at the same time 2 As a protective gas, under mechanical stirring, the nickel-cobalt-manganese salt solution is added to the reaction kettle at a rate of 2L / h by means of a metering pump, and the mixed solution of the precipitant and complexing agent is added dropwise, and the reaction system is precisely controlled The pH value is 11.5, the reaction temperature is 50°C, and the stirring speed is 900r / min. Co-precipitation reaction is carried out, and finally a brownish-yellow solid-liquid mixture i...

Embodiment 2

[0061] Weigh nickel chloride, cobalt chloride, and manganese chloride respectively in a molar ratio of 5:2:3, and dissolve them in deionized water to prepare a total concentration of 1.5mol / L, and pass an inert gas to remove oxygen for 60 minutes; prepare 4mol / L L sodium hydroxide is used as precipitating agent, 2mol / L ammonia water is used as complexing agent, pass N 2 Remove oxygen for 60 minutes; prepare 2mol / L ammonia aqueous solution as the bottom liquid and first add it to the reaction kettle, and pass N 2 As a protective gas, under mechanical stirring, the nickel-cobalt-manganese salt solution is added to the reaction kettle at a dropping rate of 1L / h by means of a metering pump, and the mixed solution of the precipitating agent and complexing agent is added dropwise, and the reaction system is precisely controlled. The pH value is 11.3, the reaction temperature is 60°C, and the stirring speed is 1000r / min. Co-precipitation reaction is carried out, and finally a light b...

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Abstract

The invention provides an ultralow-temperature lithium ion battery composite positive electrode material and a preparation method thereof, and belongs to the technical field of an ultralow-temperature lithium ion battery. The molecular formula of the composite positive electrode material is P@LiNi<x>Co<y>Mn<z>O2, wherein P is one or more of polypyrrole, polyaniline, diazonium salt and polyethylene dioxide/polyethylene glycol, x is more than or equal to 0.5 but less than or equal to 1, y is more than or equal to 0 but less than or equal to 0.3, z is more than or equal to 0 but less than or equal to 0.3, and (x+y+z) is equal to 1. The invention also provides a preparation of the ultralow-temperature lithium ion battery composite positive electrode material. The discharge capacity of a battery assembled from the positive electrode material at 20 DEG C is 80% or above of the discharge capacity of the battery at a normal temperature of 25 DEG C, and the battery has excellent cycle property.

Description

technical field [0001] The invention belongs to the technical field of ultra-low temperature lithium ion batteries, and in particular relates to an ultra-low temperature lithium ion battery composite cathode material and a preparation method thereof. Background technique [0002] As a new generation of clean and renewable energy systems, lithium-ion batteries have the advantages of high specific energy, long service life, no memory effect, and no pollution. They have been widely used in various electronic devices, electric vehicles, energy storage, mobile power supplies, etc. . However, there are also some shortcomings that cannot be ignored, such as the poor low temperature characteristics of lithium-ion batteries, which greatly restricts the application in aviation, aerospace, military, electric vehicles and other fields. The development of low-temperature lithium-ion batteries that can be directly applied to the cold regions of northern my country has important strategic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 牛利孙中辉韩冬雪李风华
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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