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Ultralow-temperature lithium-ion battery and preparation method thereof

A lithium-ion battery, ultra-low temperature technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of non-normal use, decreased discharge capacity, decreased discharge rate performance, etc., to compensate for the decrease in conductivity and improve the isotropy , The effect of good material capacity

Active Publication Date: 2018-09-14
深圳市金力新能源科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the discharge capacity of lithium-ion batteries will be severely reduced at low temperatures. For example, at -40°C, the low-temperature discharge capacity of lithium-ion batteries can only reach 10%-30% of the discharge capacity at room temperature, and the discharge rate performance also drops greatly. At -60°C The ultra-low temperature environment cannot be used normally at all

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  • Ultralow-temperature lithium-ion battery and preparation method thereof
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  • Ultralow-temperature lithium-ion battery and preparation method thereof

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preparation example Construction

[0029] A method for preparing a positive electrode active material. First, uniformly mix rare earth metal oxides and alkaline earth metal oxides at a mass ratio of 1:1, and then add 0.05-5 parts of mixed powder to 100 parts of LiCoO 2 Among them, sinter after mixing evenly to form LiCoMO compound, which can be obtained after jet milling and classification, where M represents a mixture of rare earth elements and alkaline earth metals.

[0030] Further, the sintering conditions are sintering at a temperature of 850°C-950°C for 10h-15h in an inert gas atmosphere; the rare earth elements include one of Sc, Y, La, Ce, Nd, Gd and Sm, so The alkaline earth metals include Mg.

[0031] A positive electrode active material, the positive electrode active material is prepared by the above preparation method, and the particle size D50 of the positive electrode active material is 4 μm-7 μm.

[0032] A method for preparing an ultra-low temperature lithium-ion battery, first preparing positi...

Embodiment 1

[0047] A method for preparing positive electrode active materials, firstly, CeO with a particle size of 10 μm-30 μm 2 Mix evenly with MgO at a mass ratio of 1:1, and then add 4 parts of the mixed powder to 100 parts of LiCoO 2 In, and mixed uniformly; then sintered to form a LiCoMO compound, which is obtained after jet milling and classification, where M represents a mixture of Ce and Mg.

[0048] Further, the sintering condition is sintering at a temperature of 950° C. for 10 h in an inert gas atmosphere; in this embodiment, the rare earth element is Ce, and the alkaline earth metal is Mg.

[0049] A positive electrode active material, the positive electrode active material is prepared by the above preparation method, and the particle size D50 of the positive electrode active material is 4 μm-7 μm.

Embodiment 2

[0051] A method for preparing positive electrode active materials, firstly, CeO with a particle size of 10 μm-30 μm 2 and MgO in a mass ratio of 1:1, and then in parts by mass, take 2 parts of the mixed powder and add it to 100 parts of LiCoO 2 In, and mixed uniformly; then sintered to form a LiCoMO compound, which is obtained after jet milling and classification, where M represents a mixture of Ce and Mg.

[0052] Further, the sintering condition is sintering at a temperature of 900° C. for 13 hours in an inert gas atmosphere; in this embodiment, the rare earth element is Ce, and the alkaline earth metal is Mg.

[0053] A positive electrode active material, the positive electrode active material is prepared by the above preparation method, and the particle size D50 of the positive electrode active material is 4 μm-7 μm.

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Abstract

The invention discloses an ultralow-temperature lithium-ion battery and a preparation method thereof. In view of improving the dispersion capability of lithium ions in an active material and electrodeinterface performance, electrochemical reversible performance and low-temperature conducting performance of the lithium ions are effectively improved through optimizing material performance and improving a pulping technology, and the electrode specific capacity is improved. According to the preparation method disclosed by the invention, the prepared lithium-ion battery has 0.2C discharge under anultralow-temperature environment condition of -60 DEG C, the capacity retention rate still can reach 80 percent or more, and the lithium-ion battery can be normally charged at the temperature of -60DEG C; the technical difficulty that a traditional lithium-ion battery are difficult to use normally at the low-temperature that the temperature is lower than -20 DEG C is broken through; an application range of the lithium-ion battery on military equipment is greatly expanded.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to an ultra-low temperature lithium ion battery and a preparation method thereof. Background technique [0002] As a new generation of green energy, lithium-ion batteries have the advantages of high working voltage, long cycle life, light weight, high energy density, good rate performance and safety performance, small self-discharge, no memory effect, and no environmental pollution. Applied to various fields such as electronics, transportation, medical treatment, aviation, etc., with the continuous expansion of the application field and application range, higher requirements are put forward for the performance of the battery. However, the low-temperature discharge performance of traditional lithium-ion batteries is poor, especially the low-temperature charging performance. Most lithium batteries are difficult to use normally below -20°C, which greatly restricts their use in high latitudes, h...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M10/0525
CPCH01M4/362H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张洪白彬王红飞张遂超蒋昱东赵佑军
Owner 深圳市金力新能源科技有限公司
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