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Lithium ion batteries cathode material additive, preparation method thereof, and cathode material and lithium ion battery both containing same

A technology of lithium ion battery and positive electrode material, applied in the direction of lithium battery, battery electrode, positive electrode, etc., can solve problems such as affecting battery performance and stable existence of lithium supplementary materials

Active Publication Date: 2015-11-25
BYD CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problems that the existing lithium supplementary materials cannot exist stably in the air for a long time and the impurities introduced into various lithium supplementary methods seriously affect the performance of the battery in the existing lithium supplementary technology, the present invention provides a lithium ion supplementary battery with the function of supplementing lithium ions and Lithium-ion battery positive electrode material additive and preparation method thereof, positive electrode material containing the additive and lithium-ion battery that simultaneously meet the high requirements for stability and safety of lithium-ion batteries

Method used

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  • Lithium ion batteries cathode material additive, preparation method thereof, and cathode material and lithium ion battery both containing same
  • Lithium ion batteries cathode material additive, preparation method thereof, and cathode material and lithium ion battery both containing same
  • Lithium ion batteries cathode material additive, preparation method thereof, and cathode material and lithium ion battery both containing same

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preparation example Construction

[0033] The present invention also provides a method for preparing the positive electrode material additive of the lithium ion battery, and the method includes the following steps:

[0034] S1. Surface modification of inorganic lithium salt with silane coupling agent to obtain silane coupling agent-modified inorganic lithium salt;

[0035] S2. Mix the inorganic lithium salt modified by the silane coupling agent, the low melting point polymer and the volatile organic solvent in step S1, and heat until the organic solvent is completely volatilized, so that the low melting point polymer is coated on the surface of the inorganic lithium salt and dried Then a composite material with a core-shell structure is obtained.

[0036] According to the method for preparing lithium ion battery positive electrode material additives according to the present invention, preferably, the step S1 includes adding inorganic lithium salt to an aqueous ethanol solution, heating, and then adding a mixture of si...

Embodiment 1

[0075] (1) Prepare the silane coupling agent solution according to the ratio of 20% silane coupling agent KH550, 72% ethanol and 8% water.

[0076] (2) Take 50g LiFePO 4 Add the ethanol aqueous solution and heat to 60°C to obtain a mixed solution.

[0077] (3) Add 15 ml of the silane coupling agent solution in step (1) slowly to the mixed solution in step (2), and stir at 200 rad / min until the solvent is completely volatilized. Place the remaining materials in a vacuum drying oven at 150°C for drying. After drying, they are soaked in ethanol, washed and centrifuged to obtain LiFePO modified with silane coupling agent. 4 .

[0078] (4) Add 100ml of decahydronaphthalene to a 500ml three-necked round bottom flask, heat to 100°C, and stir at 200rad / min. While stirring, add 10g of low-density polyethylene, and continue stirring until the polyethylene is completely dissolved.

[0079] (5) Add 50g of LiFePO surface-modified by silane coupling agent in step (3) to the mixed solution of step (...

Embodiment 2

[0081] According to the same treatment method in Example 1, the difference is that LiNi is used in step (2) 0.8 Co 0.15 Al 0.05 O 2 Instead of LiFePO 4 , The positive electrode material additive A2 of lithium ion battery was prepared.

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Abstract

An additive for a positive electrode material includes an internal component and an external component. The internal component contains a silane coupling agent modified inorganic lithium salt. The external component is formed on a surface of the internal component and contains a polymer with a low melting point. The internal component and the external component form a core-shell structure together, and the shell has a porosity of 0.01％to 20％. A positive electrode material and a lithium-ion battery including the additive, and method of preparing the lithium-ion battery are also provided.

Description

Technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery positive electrode material additive and a preparation method thereof, a positive electrode material containing the additive, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high discharge voltage, high energy density, and long cycle life. Therefore, they are widely used in the field of portable electronic devices and are favored by high-tech applications such as military, aerospace, and electric vehicles. [0003] At present, the negative electrode active material of commercial lithium-ion batteries mainly uses graphite negative electrode, and the lithium insertion potential of graphite negative electrode is lower than the reduction potential of electrolyte solvent PC, EC, DEC, etc., so the solvent will be reduced during the charging process and will be on the surface of the negative electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M10/0525C01B25/45C01G53/50C01P2004/03H01M4/131H01M4/136H01M4/1391H01M4/1397H01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/622H01M10/052H01M10/4235Y02E60/10C01G53/42C01P2006/40C08K3/32C08K9/06C08K2003/328C08K2201/003H01M2004/028
Inventor 韩晓燕李世彩张中春
Owner BYD CO LTD
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