Lithium ion secondary battery cathode material and preparation method thereof

A technology for positive electrode materials and secondary batteries, which is applied in the field of lithium ion secondary battery positive electrode materials and its preparation, and can solve the problems of low-cobalt materials such as rate performance, reduction, and poor kinetic performance

Pending Publication Date: 2021-03-12
BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of poor kinetic performance, element dissolution and poor cycle performance of low-cobalt materials, the present invention proposes a lithium-ion secondary battery positive electrode material and a preparation method thereof. The synergistic effect or further reaction of low-cobalt materials improves the rate performance of low-cobalt materials, reduces element dissolution and improves cycle performance, and overcomes the technical effects that cannot be brought by single element doping and coating

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Lithium, nickel, cobalt, and manganese are mixed by ball milling lithium carbonate, nickel acetate, cobalt acetate, and manganese acetate in a molar ratio of 1.10:0.55:0.05:0.40; the mixed materials are placed in a muffle furnace Calcined at 990° C. for 10 h in an air atmosphere, and then crushed and sieved by a jet mill to obtain a core material of nickel cobalt lithium manganese oxide.

[0037] 2) Weighing the first coating material lithium nitrate according to 1.00% of the weight of the core material, mixing the first coating material and the core material at high speed, and sintering the mixed material at 800° C. for 6 hours in an air atmosphere. The sintered material is crushed and screened to obtain intermediate products.

[0038] 3) Weigh the second coating material alumina according to 0.05% of the weight of the intermediate product in step 2), mix the second coating material and the intermediate product at high speed, and sinter the mixed material at 600° C....

Embodiment 2

[0041] 1) Prepare nickel sulfate, cobalt sulfate, magnesium sulfate, and sodium metaaluminate into hydroxide precipitates by co-precipitation method with nickel, cobalt, manganese, and aluminum in a molar ratio of 0.55:0.05:0.39:0.01. After suction filtration Carry out drying; mix the lithium carbonate and the prepared hydroxide precipitation at a high speed with the total content of lithium and metal at a molar ratio of 1.06:1, and place the mixed material in a muffle furnace for calcination at 1000°C for 1 hour in an air atmosphere , and then carry out jet mill crushing and sieving to obtain the core material of nickel cobalt lithium manganese oxide.

[0042] 2) Weighing the first coating material lithium fluoride according to 0.05% of the weight of the core material, mixing the first coating material and the core material at high speed, and sintering the mixed material in an air atmosphere. The sintering temperature of the first stage is 900°C, and the time is 5h. The seco...

Embodiment 3

[0046] 1) Lithium, nickel, cobalt, and manganese are mixed by ball milling lithium carbonate, nickel acetate, cobalt acetate, and manganese acetate in a molar ratio of 1.10:0.60:0.10:0.30; the mixed materials are placed in a muffle furnace Calcined at 650° C. for 20 h in an air atmosphere, and then crushed and sieved by a jet mill to obtain a core material of nickel cobalt lithium manganese oxide.

[0047] 2) Weigh the first coating material sodium hydroxide according to 0.30% of the weight of the core material, mix the first coating material and the core material at high speed, and sinter the mixed material at 800° C. for 6 hours in an air atmosphere. The sintered material is crushed and screened to obtain intermediate products.

[0048] 3) Take by weighing the second coating material vanadium pentoxide and ammonium dihydrogen phosphate according to 1.50% of the weight of the intermediate product in step 2), wherein the molar ratio of vanadium and phosphorus is about 1:1, and...

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Abstract

The invention provides a lithium ion secondary battery cathode material and a preparation method thereof, belongs to the technical field of lithium ion batteries, and aims to effectively improve Li/Nimixed arrangement caused by a low-cobalt material in a sintering process by reasonably designing doped coating elements and utilizing a synergistic effect or further reaction among the elements. According to the invention, the rate capability of the low-cobalt material is improved, meanwhile, element dissolution is reduced, the cycle performance is improved, the technical effect which cannot be brought by doping and coating of a single element is overcome, and the problems of poor dynamic performance and poor element dissolution and cycle performance of the low-cobalt material are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion secondary battery cathode material and a preparation method thereof. Background technique [0002] has the chemical formula LiMO 2 Lithium metal oxides, where M is a transition metal, are current cathode materials for lithium-ion batteries. In particular, NCM ternary materials in which M is Ni, Co and Mn have been widely used in power batteries. Among them, Co is a relatively rare transition metal element. With the popularity of power batteries, the price fluctuation of Co has seriously troubled the large-scale application of the power battery market. Therefore, it is very necessary to develop low-cobalt or even cobalt-free materials to meet the needs of the power battery market. [0003] In layered materials, the absence or reduction of Co element will lead to the deterioration of the kinetic properties of the material, accompanied by the decrease of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M4/485H01M10/0525C01G53/00
CPCC01G53/44C01P2006/40H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 申兰耀孙洪旭于永利韩坤明蒋宁黄震雷杨新河周恒辉
Owner BEIJING TAIFENG XIANXING NEW ENERGY TECH CO LTD
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