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Anode material and preparation method thereof, and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in the direction of positive electrodes, battery electrodes, secondary batteries, etc., can solve the problems that the electrochemical performance needs to be further improved, and achieve good chemical stability, good ion transmission channels, and good cycle performance Effect

Inactive Publication Date: 2021-02-26
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the products obtained by the above methods all have the problem that the electrochemical performance needs to be further improved.

Method used

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  • Anode material and preparation method thereof, and lithium ion battery

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Embodiment 1

[0056] This embodiment provides a positive electrode material, the positive electrode material includes a core and a cladding layer coated on the core, the core is a nickel-cobalt-manganese ternary material (LiNi 0.5 co 0.3 mn 0.2 o 2 ), the material of the cladding layer is LiMn 2 o 4 , the coating amount of the coating layer in the positive electrode material is 0.5%.

[0057] This embodiment also provides a method for preparing the above positive electrode material, the method is as follows:

[0058] (1) The lithium source (lithium carbonate) and the hydroxide precursor (Ni 0.5 co 0.3 mn 0.2 (OH) 2 ) for ball milling and mixing for 6 hours, the dispersant for ball milling mixing is water, the ball-to-material ratio of ball milling mixing is 5:1, and the mixed product is calcined in two stages in air, the temperature of the first stage of calcination is 450°C, and the first stage of calcination The time for the second stage of calcination is 3 hours. In the second s...

Embodiment 2

[0061] This embodiment provides a positive electrode material, the positive electrode material includes a core and a cladding layer coated on the core, the core is a nickel-cobalt-manganese ternary material (0.2Li 2_ MnO 3 0.8LiNi 0.9 co 0.1 o 2 ), the material of the cladding layer is Li 4 Ti 5 o 12 , the coating amount of the coating layer in the positive electrode material is 0.1%.

[0062] This embodiment also provides a method for preparing the above positive electrode material, the method is as follows:

[0063] (1) The lithium source (lithium hydroxide) and the hydroxide precursor (Ni 0.72 co 0.08 mn 0.2 (OH) 2 ) for ball milling and mixing for 2 hours, the dispersant of ball milling mixing is ethanol, the ball-to-material ratio of ball milling mixing is 3:1, and the mixed product is subjected to two-stage calcination in air, the temperature of the first stage of calcination is 350°C, and the first stage of calcination The time for the second-stage calcinatio...

Embodiment 3

[0066] This embodiment provides a positive electrode material, the positive electrode material includes a core and a cladding layer coated on the core, the core is lithium cobaltate (LiCoO 2 ), the material of the cladding layer is Li 4 Ti 5 o 12 , the coating amount of the coating layer in the positive electrode material is 1%.

[0067] This embodiment also provides a method for preparing the above positive electrode material, the method is as follows:

[0068] (1) The lithium source (lithium carbonate) and the hydroxide precursor (Co(OH) 2 ) for ball milling and mixing for 10 hours, the dispersant for ball milling mixing is water, the ball-to-material ratio for ball milling mixing is 8:1, and the mixed product is subjected to two-stage calcination in air, the temperature of the first stage of calcination is 550°C, and the first stage of calcination The time for the second-stage calcination is 1 hour, and the temperature for the second-stage calcination is 1000° C., and t...

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Abstract

The invention discloses an anode material and a preparation method thereof, and a lithium ion battery. The anode material comprises a core and a coating layer coating the core, and the coating layer is made of a material capable of conducting electrons and ions. The preparation method comprises the following steps: 1) mixing a lithium source with a hydroxide precursor, and calcining a mixed product to obtain the core; and 2) mixing the core with the coating layer material, and calcining the mixed product to obtain the anode material, wherein the coating layer material is the material capable of conducting both electrons and ions. According to the anode material provided by the invention, the material capable of conducting electrons and ions is coated so that the electrochemical performanceof the material is improved, and a rate capability and safety performance can be improved while good cycle performance is maintained.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Compared with traditional battery materials, nickel, cobalt, and manganese ternary materials have the advantages of high specific capacity and low cost, and have a good synergistic effect among the three elements, so they are widely used. However, the low capacity retention rate and poor thermal stability of this kind of material also restrict its development. [0003] This is usually attributed to the unstable Ni 4+ , the anisotropic volume change during charging produces microcracks, and this internal stress compromises the mechanical stability of the cathode and aggravates the chemical degradation due to electrolyte erosion. [0004] In order to solve these problems in cathode materials, the industry and academia have improved the stability of materials by pre...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 王超曾汉民林文佳何巍刘建华刘金成
Owner EVE ENERGY CO LTD
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