Mg-doped Li-rich anode material and preparation method for same

A lithium-rich cathode material and solution technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor rate performance and low capacity, and achieve the effects of good structure, small particle size and good battery performance

Inactive Publication Date: 2013-12-11
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0006] One of the purposes of the present invention is to solve the above-mentioned lithium ion battery cathode material LiCoO 2 、LiFePO

Method used

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  • Mg-doped Li-rich anode material and preparation method for same
  • Mg-doped Li-rich anode material and preparation method for same
  • Mg-doped Li-rich anode material and preparation method for same

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[0040] Example 1

[0041] A lithium-rich cathode material doped with Mg, its molecular formula is Li(Li 0.2 Ni 0.13 Co 0.13 Mn 0.54 ) 0.98 Mg 0.02 O 2 .

[0042] The above-mentioned Mg-doped lithium-rich cathode material Li(Li 0.2 Ni 0.13 Co 0.13 Mn 0.54 ) 0.98 Mg 0.02 O 2 The preparation method specifically includes the following steps:

[0043] (1) Dissolve 3.2029g lithium acetate, 0.8136g cobalt acetate, 0.8128g nickel acetate, 3.2024g manganese acetate and 0.1343g magnesium nitrate in deionized water to form solution 1;

[0044] The amounts of lithium acetate, nickel cobalt acetate, manganese acetate and magnesium nitrate used above are calculated based on the molar ratio of Li: Co: Ni: Mn: Mg, that is, the molar ratio of Li: Co: Ni: Mn: Mg is 1.2558: 0.1274:0.1274:0.5292:0.02;

[0045] Lithium acetate is used in excess of 5% to make up for the loss of lithium during subsequent calcination;

[0046] (2) Dissolve 4.2028g citric acid in deionized water to form solution 2;

[0047] T...

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Abstract

The invention discloses an Mg-doped Li-rich anode material and a preparation method for the same, wherein the molecular formula of the Mg-doped Li-rich anode material is Li(Li0.2Ni0.13Co0.13Mn0.54)0.98Mg0.02O2. The preparation method comprises the following steps of: dissolving lithium acetate, cobaltous acetate, nickel acetate, manganese acetate and magnesium nitrate in deionized water in a molar ratio of Li to Co to Ni to Mn to Mg being 1.196: 0.1274: 0.1274: 0.5292: 0.02 to obtain solution 1; adding citric acid in deionized water to obtain solution 2 in a ratio of the molar weight of the citric acid to the total molar weight of Ni, Co, Mn and Mg being 1: 1; and adding the solution 2 in the solution 1, adjusting the pH value to be 9, stirring at 80 DEG C until a purple gel is formed, sequentially performing drying, ball-milling, segmented calcination and grinding, and thus obtaining the Mg-doped Li-rich anode material which is high in specific discharge capacity, good in circulation performance, and excellent in rate performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of cathode materials for lithium ion batteries, and in particular relates to a Mg-doped lithium-rich cathode material and a preparation method thereof. Background technique [0002] The power, voltage and other properties of the cathode material of lithium-ion batteries are the key factors affecting the energy density, safety performance and cycle life of the battery. At present, the commercialized lithium-ion battery cathode material LiCoO 2 、LiFePO 4 The capacities of these batteries are 140mAh / g and 160mAh / g respectively, so the development of high-capacity lithium-ion battery cathode materials has become the focus of attention. Lithium-rich cathode materials for lithium-ion batteries have the advantages of ultra-high specific capacity (greater than 250mAh / g), low cost (low cobalt content), and environmental friendliness, and have good development prospects. However, the first irreversib...

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395
CPCY02E60/10
Inventor 徐群杰靳雪陆佟李美明袁小磊周罗增
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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