Low-temperature lithium ion battery anode material and method for preparing same

A technology for lithium-ion batteries and cathode materials, which is 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 needs of the electric vehicle market, and is suitable for large-scale commercial production. The effect of low manufacturing cost and high specific capacity

Inactive Publication Date: 2017-02-15
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The invention aims to solve the technical problem that the low-temperature performance of the current lithium-ion battery cannot meet the market demand of electric vehicles, and provides a low-temperature lithium-ion battery positive electrode material and a preparation method thereof

Method used

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  • Low-temperature lithium ion battery anode material and method for preparing same
  • Low-temperature lithium ion battery anode material and method for preparing same
  • Low-temperature lithium ion battery anode material and method for preparing same

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preparation example Construction

[0032] The present invention also provides a method for preparing a low-temperature lithium-ion battery positive electrode material, comprising the following steps:

[0033] Step 1: Weigh nickel salt, cobalt salt, and manganese salt according to the stoichiometric ratio and dissolve them in deionized water. After the dissolution is complete, pass an inert gas to remove oxygen for 30 to 60 minutes to prepare a nickel, cobalt, and manganese salt solution;

[0034] Step 2: Prepare a mixed aqueous solution of complexing agent and precipitating agent, and pass inert gas to remove oxygen for 30-60 minutes;

[0035] Step 3: prepare the complexing agent aqueous solution as the bottom liquid and add it to the reaction kettle, pass the inert gas as the protective gas, and then add the nickel-cobalt-manganese salt solution obtained in step 1 into the reaction kettle dropwise under mechanical stirring, and drop Add the mixed aqueous solution of precipitating agent and complexing agent, an...

Embodiment 1

[0046] Weigh nickel sulfate, cobalt sulfate, and manganese sulfate respectively in a molar ratio of 5:2:3, 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; a nickel-cobalt-manganese salt solution is obtained;

[0047] Prepare 4mol / L sodium hydroxide as a precipitant, 2mol / L ammonia as a complexing agent, mix the two, the volume ratio of the precipitating agent and complexing agent is 2:1, pass through N 2 Deoxygenation for 40 minutes;

[0048] 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 of the solution i...

Embodiment 2

[0054] Weigh nickel chloride, cobalt chloride, and manganese chloride respectively in a molar ratio of 6:2:2, 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; Cobalt manganese salt solution;

[0055] Prepare 4mol / L sodium hydroxide as a precipitant, 2mol / L ammonia as a complexing agent, mix the two, the volume ratio of the precipitating agent and complexing agent is 5:1, pass through N 2 Deoxygenation for 60 minutes;

[0056] Prepare a 2mol / L aqueous ammonia 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 of the solution was 11....

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Abstract

The invention provides a low-temperature lithium ion battery anode material and a method for preparing the same, and belongs to the field of lithium ion battery anode materials. By the aid of the low-temperature lithium ion battery anode material and the method, the technical problems of poor low-temperature performance of existing lithium ion batteries and incapability of meeting market demands on electric vehicles can be solved. A structural formula of the low-temperature lithium ion battery anode material is LiNi<x>Co<y>Mn<z>M<e>O<2>, wherein the x is larger than or equal to 0.5 and is smaller than or equal to 1, the y is larger than or equal to 0 and is smaller than or equal to 0.3, the z is larger than or equal to 0 and is smaller than or equal to 0.3, the e is larger than or equal to 0 and is smaller than 1, the sum of the x, the y, the z and the e is equal to 1, the M represents doped trace elements, and the doped trace elements are selectively a type of Al, Mg, Zn, Ce and La. The low-temperature lithium ion battery anode material and the method have the advantages that the low-temperature lithium ion battery anode material is high in specific capacity and first charge-discharge Coulomb efficiency and excellent in low-temperature performance, and the discharge capacity of the low-temperature lithium ion battery anode material at the low-temperatures at least can reach 85% of the discharge performance of the low-temperature lithium ion battery anode material at the normal temperatures under various multiplying power conditions.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode materials, and in particular relates to a low-temperature lithium-ion battery 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 energy density, long service life, and no pollution. Batteries have been widely used in 3C digital products, electric vehicles and other fields. Although lithium-ion batteries have many advantages, there are also some fatal shortcomings, such as the poor low-temperature performance of lithium-ion batteries, which greatly restricts their application in aviation, aerospace, military, electric vehicles and other fields, especially In cold regions such as Northeast my country, the temperature is below zero degrees Celsius for up to 6 months a year. Therefore, if electric vehicles can be used normally in cold regions such as Nort...

Claims

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Application Information

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