Lithium ion battery, surface-modified ternary material and preparation method

A surface modification and modification technology, which is applied in the direction of electrical components, battery electrodes, secondary batteries, etc., can solve problems such as the inability to evenly distribute coatings, achieve improved stability and processing performance, improve performance, and controllable thickness Effect

Active Publication Date: 2018-11-06
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing a surface-modified ternary cathode material, which aims to solve the technical problem that the existing coating method cannot make the coating evenly distributed on the surface of the ternary cathode material

Method used

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  • Lithium ion battery, surface-modified ternary material and preparation method
  • Lithium ion battery, surface-modified ternary material and preparation method
  • Lithium ion battery, surface-modified ternary material and preparation method

Examples

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preparation example Construction

[0029] A method for preparing a surface-modified ternary positive electrode material according to an embodiment of the present invention includes:

[0030] S1: Place the ternary cathode material pretreated under preset process conditions in an atomic layer deposition reaction chamber filled with a specified atmosphere.

[0031] The ternary cathode material is composed of nickel, cobalt, manganese and three transition metal elements as the main elements, and the general formula is expressed as LiNi x co y mn z o 2 (0≤x,y,z<1). The morphology of the ternary positive electrode material in this embodiment includes single crystal morphology or secondary particle morphology.

[0032] The preset process conditions of this embodiment include: drying in the temperature range of 100°C to 150°C for 6h to 12h, so as to fully remove the moisture of the ternary positive electrode material, so as to improve the surface coating effect of the ternary positive electrode material, and reduce...

Embodiment 1

[0052] Will LiNi 0.84 co 0.1 mn 0.06 o 2 After drying in the temperature range of 120°C for 10h, put it into the atomic layer deposition reaction chamber filled with dry air in advance, raise the temperature of the reaction chamber to keep the temperature at 150°C, and then vacuumize the reaction chamber for 10s; nitrogen is the carrier and Trimethylborane forms a carrier fluid, which is passed into the above-mentioned reaction chamber, and the reaction time is controlled to be 1s. After the reaction, continue to pass into nitrogen for cleaning for 10s; then the H 2 Mix O and nitrogen to form a carrier gas flow, pass it into the above reaction chamber, and control the reaction time for 1 second, continue to pass nitrogen gas for cleaning for 8 seconds after the reaction; then continue to mix butyl lithium and nitrogen gas to form a carrier flow, pass it into the above reaction chamber, The time is controlled at 2s, and after the reaction is completed, continue to feed nitro...

Embodiment 2

[0055] The ternary material is LiNi 0.6 co 0.2 mn 0.2 o 2 The drying condition is 120°C / 12h; the temperature of the reaction chamber is 120°C; the vacuum is pumped for 20s; the organic boron source is triethylborane, the reaction time is 4s, and the cleaning time is 20s; 2 The reaction time after O is 0.05s, and the cleaning time is 0.5s; the organolithium salt is ethyllithium, the reaction time is 4s, and the cleaning time is 50s; 2 The reaction time after O is 0.05s, and the cleaning time is 0.5s; repeat the coating step 6 times, and the others are the same as in Example 1 to obtain the surface modified ternary positive electrode material B, the thickness of the coating layer is 1.2nm, corresponding to the button lithium Ion battery B1, soft pack lithium-ion battery B2.

[0056] The gram capacity of the button lithium-ion battery B1 can reach 177mAh / g. The electrical performance test results of the soft-pack lithium-ion battery B2 are: at 50% SOC, the DC internal resist...

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Abstract

The invention discloses a preparation method of a surface-modified ternary positive electrode material. The preparation method comprises the steps that a ternary positive electrode material subjectedto preset process condition preprocessing is placed into an atomic layer deposition reaction chamber full of a specific atmosphere; a temperature rising program is triggered to enable the temperatureof the reaction chamber to be in a specific temperature range; after the reaction chamber is vacuumized, an organic boron source is introduced into the reaction chamber under the effect of carrier gas, and after a first reaction time, the carrier gas continues to be introduced to remove the excess organic boron source to obtain a first surface-modified ternary positive electrode material precursor; and a gaseous-state oxidizing agent is introduced into the reaction chamber under the effect of the carrier gas, and after a second reaction time when the gaseous-state oxidizing agent is controlledto react with the first surface-modified ternary positive electrode material precursor, the carrier gas continues to be introduced to remove the excess gaseous-state oxidizing agent and reaction by-products to obtain the first surface-modified ternary positive electrode material coated with a first specific amount of boron oxide.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a lithium ion battery, a surface modified ternary material and a preparation method. Background technique [0002] As the core component of new energy vehicles, the performance of power lithium-ion batteries is directly related to the promotion and popularization of new energy vehicles, which will also provide a huge market for the lithium-ion battery industry. As an important part of lithium-ion batteries, the improvement of the performance of cathode materials is crucial to the improvement of the performance of lithium-ion batteries. With its high energy density, the ternary cathode material gradually expands its market share in the power lithium-ion battery for new energy vehicles, thus becoming the focus of the industry at this stage. [0003] New energy vehicles not only require high energy density of vehicle power lithium-ion batteries, but also require them to have excellent cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 陈巍张耀李鲲
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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