Lithium ion battery cathode material and preparation method thereof

A technology for lithium ion batteries and positive electrode materials, which is applied to the field of positive electrode materials for lithium ion batteries and its preparation, can solve the problems of low nickel content in a ternary system, and cannot achieve surface cleaning to remove residual alkali, etc., so as to improve surface structure and improve interface stability. The effect of reducing the residual alkali content on the surface

Active Publication Date: 2017-11-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the nickel content of the ternary system in the above-mentioned CN104916837 A patent is low, and the simple Al doping and subsequent boron element coating adopts the ethanol system and the dry mixing in CN 104916837 A cannot achieve the effect of water washing to remove the residual alkali on the surface

Method used

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  • Lithium ion battery cathode material and preparation method thereof
  • Lithium ion battery cathode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 , according to lithium hydroxide monohydrate (Li / (Ni+Co+Mn) molar ratio 1.05), additive nano-Al 2 o 3 (Al / (Ni+Co+Mn) molar ratio 0.06) After the three materials were uniformly mixed in a high-speed mixer, they were sintered at 790° C. for 12 hours in a pure oxygen atmosphere to obtain an unmodified powder. The unmodified powder and water are mixed at a ratio of 1000g / 1L, stirred, centrifuged, dried and pulverized at 100°C to obtain a water-washed powder. The water-washed powder and boron oxide (addition amount: B / (Ni+Co+Mn) molar ratio 0.01) were mixed by dry method, and then sintered at 800°C for 5 hours under pure oxygen atmosphere to obtain a high-nickel cathode material.

Embodiment 2

[0025] Precursor Ni 0.82 co 0.12 mn 0.6 (OH) 2 , according to lithium hydroxide monohydrate (Li / (Ni+Co+Mn) molar ratio 1.04), additive nano ZrO 2 (Zr / (Ni+Co+Mn) molar ratio 0.01) After the three materials are uniformly mixed in a high-speed mixer, they are sintered at 770° C. for 20 h in a pure oxygen atmosphere to obtain an unmodified powder. The unmodified powder is mixed with water at a ratio of 700g / 1L, stirred, centrifuged, dried and pulverized at 100°C to obtain a water-washed powder. After dry mixing the water-washed powder and boric acid (addition amount: B / (Ni+Co+Mn) molar ratio 0.02), sintering at 700°C for 2 hours under a pure oxygen atmosphere to obtain a high-nickel cathode material.

Embodiment 3

[0027] Precursor Ni 0.85 co 0.1 mn 0.5 (OH) 2 According to Lithium Hydroxide Monohydrate (Li / (Ni+Co+Mn) molar ratio 1.05), additive nano-MgO (Mg / (Ni+Co+Mn) molar ratio 0.03) three materials are mixed evenly in a high-speed mixer Finally, under pure oxygen atmosphere, sinter at 730°C for 15h to obtain unmodified powder. The unmodified powder is mixed with water at a ratio of 500g / 1L, stirred, centrifuged, dried and pulverized at 100°C to obtain a water-washed powder. The water-washed powder and boron oxide (addition amount: B / (Ni+Co+Mn) molar ratio 0.03) were mixed by dry method, and then sintered at 650°C for 3 hours under pure oxygen atmosphere to obtain a high-nickel cathode material.

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Abstract

Belonging to the technical field of lithium ion batteries, the invention discloses a lithium ion battery cathode material and a preparation method thereof. The chemical molecular formula of the cathode material is Lix(NiaCobMnc)1-yMyO2, wherein x is greater than or equal to 0.96 and smaller than or equal to 1.04, y is greater than or equal to 0.01 and smaller than or equal to 0.06, a is greater than or equal to 0.8 and smaller than or equal to 0.9, and a+b+c=1, M has a general formula of BzM'1-z, M' is composed of one or several of the following elements: Al, Mg, Ti and Zr, and z is greater than or equal to 0.1 and smaller than or equal to 0.5. The cathode material is coated by a layer of compound containing L, B, Ni, Co and Mn, the content of B in the outermost surface of the coating layer is at least two times that of the B in the innermost layer of the coating layer. According to the invention, the high capacity cathode material is acquired from a high nickel content ternary system, additionally multielement doping is employed to stabilize the crystal structure of the material, and then by means of washing, boron element surface modification and two-step sintering process, the material surface structure can be improved, and the surface residual alkali content can be reduced to improve the interface stability. The whole technological process of the invention is simple, and is easy for large scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of lithium-ion battery technology and the market's requirements for the energy density of the battery system, the high-capacity layered cathode material Li(Ni x co y mn z m 1-x-y-z )O 2 (0.6<x<1, 0<y<0.2, 0≤z<0.2)) has the most development prospects. [0003] In layered materials, with Ni 2+ The increase of the content will increase the capacity of the material, but the high nickel content usually leads to the mixed arrangement of lithium and nickel during the sintering process, which seriously affects the coulombic efficiency of lithium ion deintercalation; secondly, the surface residual alkalinity of the high nickel content material is high, and the surface structure The structure is destroyed during the repeated de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈龙夏昕李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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