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Cobalt-free high-nickel positive electrode material and preparation method thereof, lithium ion battery positive electrode and lithium ion battery

A lithium-ion battery, cathode material technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of poor cycle stability of cobalt-free and high-nickel cathode materials, and achieve improved high-temperature cycle performance, high wear resistance, The effect of good conductivity

Active Publication Date: 2021-06-25
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a cobalt-free high-nickel positive electrode material and its preparation method, lithium-ion battery positive electrode and lithium-ion battery, to solve the problem of poor cycle stability of cobalt-free high-nickel positive electrode materials in the prior art

Method used

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  • Cobalt-free high-nickel positive electrode material and preparation method thereof, lithium ion battery positive electrode and lithium ion battery
  • Cobalt-free high-nickel positive electrode material and preparation method thereof, lithium ion battery positive electrode and lithium ion battery
  • Cobalt-free high-nickel positive electrode material and preparation method thereof, lithium ion battery positive electrode and lithium ion battery

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preparation example Construction

[0030] In another typical embodiment of the present application, a method for preparing the aforementioned cobalt-free high-nickel positive electrode material is provided, the method comprising: Step S1, mixing the cobalt-free high-nickel base material and the coating agent to obtain Mixture; step S2, the mixture is calcined to obtain a cobalt-free high-nickel positive electrode material, and the coating agent is TiB z o 1-z solid solution particles.

[0031] Firstly, it will be mixed with the coating agent to obtain a uniform mixture, and then the mixture will be calcined to make TiB z o 1-z The solid solution particles are coated on the cobalt-free high-nickel base material after a melting-cooling process, and the preparation method is simple and easy to implement. The obtained cobalt-free high-nickel cathode material combines the advantages of high capacity, low cost and high safety of the cobalt-free high-nickel base material itself, and adopts high strength, high wear ...

Embodiment 1

[0044] Synthesis of cobalt-free high-nickel matrix materials: Lithium salt (LiOH) and cobalt-free precursor Ni 0.82 mn 0.18 (OH) 2 , be 1.05:1 to mix with the mol ratio of Li and Mn, the rotating speed of mixing is 2000rpm / min mixing material 10min, obtains the material after mixing; The material after mixing is in oxygen atmosphere (concentration is greater than 99.99%, oxygen flow rate: 10L / min ) for calcination, and heated up to 1000°C in a box-type atmosphere furnace for 20 hours at a high temperature, and then lowered to room temperature at 5°C / min to obtain a matrix material, and crushed the matrix material with a crusher to obtain a powder After the material is sieved (the screen is 300-400 mesh), the cobalt-free high-nickel base material is obtained, and its chemical formula is Li 1.05 Ni 0.82 mn 0.18 o 2 .

[0045] TiB z o 1-z Synthesis of solid solution: TiB 2 and TiO 2 Mix evenly at a molar ratio of 0.5:1 and then dry and grind the mixed material in a nitr...

Embodiment 2

[0049] The difference between embodiment 2 and embodiment 1 is that

[0050] TiB 0.5 o 0.5 The mass of solid solution particles is Li 1.05 Ni 0.82 mn 0.18 o 2 0.2% of the final cobalt-free high-nickel cathode material.

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Abstract

The invention provides a cobalt-free high-nickel positive electrode material and a preparation method thereof, a lithium ion battery positive electrode and a lithium ion battery. The cobalt-free high-nickel positive electrode material comprises a cobalt-free high-nickel base material and a coating layer coating the cobalt-free high-nickel base material, the chemical formula of the cobalt-free high-nickel base material is LimNixMnyO2, wherein m is larger than or equal to 0.2 and smaller than or equal to 0.8, x is larger than or equal to 0.4 and smaller than or equal to 0.95, y is larger than or equal to 0.05 and smaller than or equal to 0.6, the coating layer is TiBzO1-z, and z is larger than or equal to 0.2 and smaller than or equal to 0.8. The cobalt-free high-nickel positive electrode material obtained through modification of the coating layer TiBzO1-z has good acid resistance, wear resistance, high mechanical strength and excellent conductivity, and when the cobalt-free high-nickel positive electrode material is used for the lithium ion battery, the high-temperature cycle performance, the capacity and the first effect of the lithium ion battery are greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a cobalt-free high-nickel positive electrode material and a preparation method thereof, a lithium ion battery positive electrode and a lithium ion battery. Background technique [0002] In recent years, the development of the power battery market has entered the fast lane, and people urgently need a cathode material with low cost, high energy density, high cycle performance and high safety. At present, the cathode material LiCoO on the market 2 Neither NCM nor ternary material (NCM) can meet the above conditions at the same time. The main reason is that the price of cobalt element continues to rise, and cobalt is also a non-environmentally friendly element. And Ni in the process of charging and discharging in NCM 2+ and Li + However, it is worth noting that the cobalt-free high-nickel cathode material (NM) and NCM cathode with the same Ni content have comparable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B35/12H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M4/131H01M10/0525C01G53/44C01B35/127C01P2004/82C01P2002/72C01P2004/03C01P2006/12C01P2006/40H01M2004/021H01M2004/028Y02E60/10C01G53/50C01P2004/61H01M4/1391C01P2004/84
Inventor 郭丰乔齐齐施泽涛王鹏飞
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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