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Modified positive electrode material for lithium ion battery, preparation method thereof and lithium ion battery comprising same

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable lithium ion deintercalation and affecting the rate performance of finished batteries, so as to maintain energy density and charge-discharge rate performance , Improve electrical performance, reduce the effect of polarization internal resistance

Active Publication Date: 2021-08-31
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dense film formed by a single inorganic material is not conducive to the normal deintercalation of lithium ions during the charge and discharge process, which will seriously affect the rate performance of the finished battery.

Method used

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  • Modified positive electrode material for lithium ion battery, preparation method thereof and lithium ion battery comprising same
  • Modified positive electrode material for lithium ion battery, preparation method thereof and lithium ion battery comprising same
  • Modified positive electrode material for lithium ion battery, preparation method thereof and lithium ion battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: NCM811 / Al 2 o 3 / LFP cathode material

[0029] In this embodiment, NCM811 (nickel-cobalt-manganese 811) is used as the positive electrode substrate, and Al 2 o 3 As a high-temperature stable material, LFP (lithium iron phosphate) is used as the positive electrode active material to prepare the positive electrode material NCM811 / Al for lithium-ion batteries 2 o 3 / LFP.

[0030] Step 1: Preparation of Conventional Positive Electrode

[0031] The electrode slurry raw materials are provided according to the weight ratio of NCM811: PVDF (polyvinylidene fluoride): conductive agent = 90:5:5. An NMP (N-methylpyrrolidone) solvent was added so that the solid content would be 60% by weight. Stir and mix in a ball mill to form a slurry. Then, evenly coat the slurry on the surface of the aluminum foil and roll it to make the compaction density 3.2-3.5g / cm 3 . Then, it was vacuum-dried at 110° C. overnight to make NCM811 positive electrode sheet.

[0032] Step 2...

Embodiment 2

[0038] Example 2: NCA / TiO 2 / LTO cathode material

[0039] In this embodiment, NCA (nickel-cobalt-aluminum) is used as the positive electrode substrate, and TiO 2 As a high-temperature stable material, LTO (lithium titanate) is used as the positive electrode active material to prepare the positive electrode material NCA / TiO for lithium-ion batteries 2 / LTO.

[0040] Step 1: Same as Step 1 of Example 1, but NCA (nickel-cobalt-aluminum) is selected as the positive electrode substrate.

[0041] Step 2: Install the NCA positive electrode prepared above as a base material in the cavity of a magnetron sputtering machine (Beijing Techno Technology Co., Ltd., JCP-350M2). The target material TiO is provided in a weight percentage of 95 / 5 weight % 2 / LTO, place the target in the cavity of the magnetron sputtering machine. Then, the cavity was evacuated to 7.0×10 -4 Pa, and the substrate is heated, and after the temperature of the substrate is stabilized at 150° C., argon gas with ...

Embodiment 3

[0046] Example 3: NCM523 / BaTiO 3 / LMFP cathode material

[0047] In this embodiment, NCM523 (nickel-cobalt-manganese 523) is used as the positive electrode substrate, and BaTiO 3 As a high-temperature stable material, LMFP (lithium iron manganese phosphate) is used as the positive electrode active material to prepare the lithium ion battery positive electrode material NCM523 / BaTiO 3 / LMFP.

[0048] Step 1: Same as Step 1 of Example 1, but choose NCM523 (nickel-cobalt-manganese 523) as the positive electrode substrate.

[0049] Step 2: Install the NCM523 positive electrode prepared above as a base material in the cavity of a magnetron sputtering machine (Beijing Techno Technology Co., Ltd., JCP-350M2). The target material BaTiO is supplied in a weight percentage of 85 / 15% by weight 3 / LMFP, place the target in the cavity of the magnetron sputtering machine. Then, the cavity was evacuated to 7.5×10 -4 Pa, and the substrate is heated, and after the temperature of the substr...

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Abstract

The present application provides a modified lithium-ion battery cathode material. The modified lithium-ion battery positive electrode material can be prepared by sputtering a combination of high-temperature stable materials and electrochemically active materials onto the lithium-ion battery positive electrode substrate to form a coating layer through magnetron sputtering technology . The coating layer can improve the thermal stability of the lithium-ion battery while maintaining the electrical properties of the battery such as energy density and charge-discharge rate. The invention also provides a method for preparing the modified lithium ion battery cathode material and a lithium ion battery containing the modified lithium ion battery cathode material.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a modified lithium ion battery cathode material, a preparation method thereof and a lithium ion battery containing the same. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery with excellent performance, and has become one of the focuses of high-tech development. Lithium-ion batteries have the following characteristics: high voltage, high capacity, low consumption, no memory effect, no pollution, small size, small internal resistance, less self-discharge, and more cycles. Because of the above-mentioned characteristics, lithium-ion batteries have been applied to many civilian and military fields such as mobile phones, notebook computers, video cameras, and digital cameras. [0003] Lithium batteries are mainly composed of positive electrode materials, negative electrode materials, separators and electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/362H01M4/48H01M4/485H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 孔令涌钟泽钦陈俊奇
Owner SHENZHEN DYNANONIC
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