Rb-doped concentration gradient ternary cathode material and preparation method thereof

A cathode material and doping concentration technology, which is applied in the field of rubidium doped concentration gradient ternary cathode material and its preparation, can solve the problems of poor high-power discharge and charge performance, difficulty in meeting the development needs of new energy vehicles, and low capacity. Achieve the effects of high tap density, high yield and improved electrochemical performance

Inactive Publication Date: 2019-10-29
光鼎铷业(广州)集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the synthesized materials have the problems of low actual capacity and poor high-power discharge and charge performance, which is difficult to meet the actual development needs of new energy vehicles.

Method used

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  • Rb-doped concentration gradient ternary cathode material and preparation method thereof
  • Rb-doped concentration gradient ternary cathode material and preparation method thereof
  • Rb-doped concentration gradient ternary cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A rubidium-doped concentration gradient ternary cathode material whose chemical expression is Li 1-x Rb x Ni 1-a-b co a mn b o 2 , where x is 0.05, 0.1≤a≤0.2, 0.1≤b≤0.3, 0.5≤1-a-b≤0.8.

[0031] The preparation method of the above rubidium-doped concentration gradient ternary cathode material, the specific steps are as follows:

[0032] (1) Synthesize the precursor of nickel-cobalt-manganese ternary cathode material with concentration gradient;

[0033] ① Weigh a certain mass of Ni (NO 3 ) 2 , Co(NO 3 ) 2 , Mn(NO 3 ) 2, dissolved in deionized water so that the total metal concentration is 5mol / L, the former is recorded as high nickel content nickel cobalt manganese solution, the latter is recorded as low nickel content nickel cobalt manganese solution, low nickel content nickel cobalt manganese solution and high nickel content The volume ratio of the nickel-cobalt-manganese solution and the bottom solution is 1:5:3; a sodium hydroxide solution with a concentr...

Embodiment 2

[0045] A method for preparing a rubidium-doped concentration gradient ternary cathode material, the specific steps are as follows:

[0046] (1) Synthesize the precursor of nickel-cobalt-manganese ternary cathode material with concentration gradient;

[0047] ①Weigh a certain mass of NiCl according to the molar ratio of Ni:Co:Mn=8:1:1 and 5:2:3 2 , CoCl 2 , MnCl 2 , dissolved in deionized water so that the total metal concentration is 1mol / L, the former is recorded as high nickel content nickel cobalt manganese solution, the latter is recorded as low nickel content nickel cobalt manganese solution, low nickel content nickel cobalt manganese solution and high nickel The volume ratio of the nickel-cobalt-manganese solution and the bottom solution is 1:1:1; a sodium hydroxide solution with a concentration of 0.15mol / L is also prepared;

[0048] ②Use a peristaltic pump to inject the low-nickel-content nickel-cobalt-manganese solution into the high-nickel-content nickel-cobalt-ma...

Embodiment 3

[0055] A method for preparing a rubidium-doped concentration gradient ternary cathode material, the specific steps are as follows:

[0056] (1) Synthesize the precursor of nickel-cobalt-manganese ternary cathode material with concentration gradient;

[0057] ① Weigh a certain mass of Ni(CH 3 COO) 2 , Co(CH 3 COO) 2 , Mn(CH 3 COO) 2 , dissolved in deionized water, so that the total metal concentration is 10mol / L, the former is recorded as high nickel content nickel cobalt manganese solution, the latter is recorded as low nickel content nickel cobalt manganese solution, low nickel content nickel cobalt manganese solution and high nickel content The volume ratio of the nickel content nickel cobalt manganese solution and the bottom solution is 1:9:5; another sodium hydroxide solution with a concentration of 0.5mol / L is prepared;

[0058] ②Use a peristaltic pump to inject the low-nickel-content nickel-cobalt-manganese solution into the high-nickel-content nickel-cobalt-mangan...

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Abstract

The invention discloses a Rb-doped concentration gradient ternary cathode material and a preparation method thereof. The chemical expression of the Rb-doped concentration gradient ternary cathode material is Li1-xRbxNi1-a-bCoaMnbO2, wherein 0.01<=x<=0.1, 0.1<=a<=0.2, 0.1<=b<=0.3, and 0.5<=1-a-b<=0.8; nickel content is gradually decreased from the center to the surface of the cathode material particles, the content of manganese and cobalt are gradually increased from the center to the surface of the cathode material, the Rb content is uniformly distributed in the cathode material. The preparation method comprises the following steps of: (1) synthesizing a concentration gradient nickel-cobalt-manganese ternary cathode material precursor; and (2) uniformly mixing the concentration gradient nickel-cobalt-manganese ternary cathode material precursor with lithium salt and Rb salt, and performing calcining to obtain the Rb-doped concentration gradient ternary cathode material. According to the Rb-doped ternary cathode material, the nickel, cobalt and manganese are distributed in a gradient mode, the structure is stable, the tap density is high, and the cycle life is long; and moreover, the rubidium ion radius is large, the lithium compound form vacancy after the rubidium is doped, the lattice gap is increased, and the lithium ion conductivity is increased significantly.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a rubidium-doped concentration gradient ternary cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are more and more widely used in electric vehicles (EV) due to their advantages of high working voltage, high specific energy, light weight, small size, long cycle life, no memory effect, fast charging and discharging, and low environmental pollution. And hybrid electric vehicle (HEV), is currently the most attention-grabbing way of energy storage. LiNi 1-x-y co x mn y o 2 Ternary materials are layered materials composed of three transition metal elements, nickel, cobalt, and manganese, referred to as ternary materials or NCM materials. Because of their low cost and high energy density, they are considered to be the most potential for development. Lithium-ion battery cathode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 唐浩林王仲明陈智伟陈志华詹心泉
Owner 光鼎铷业(广州)集团有限公司
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