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Lithium-manganese-rich laminated anode material for lithium ion battery and preparation method thereof

A technology for lithium ion batteries and cathode materials, which is applied in the field of electrochemical materials, can solve the problems of discharge voltage platform decay, poor structural stability, and insufficient structural stability, and achieves the effects of improving discharge voltage, structural stability, and high specific capacity.

Inactive Publication Date: 2017-05-24
DONGGUAN MCNAIR NEW POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of current lithium-rich manganese cathode materials is still not stable enough, for example, one of the lithium-rich manganese layered cathode materials xLi 2 MnO 3 ·(1-x)LiNi 0.4 mn 0.4 co 0.2 o 2 (0

Method used

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  • Lithium-manganese-rich laminated anode material for lithium ion battery and preparation method thereof
  • Lithium-manganese-rich laminated anode material for lithium ion battery and preparation method thereof
  • Lithium-manganese-rich laminated anode material for lithium ion battery and preparation method thereof

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Embodiment 1

[0030] The present embodiment provides a lithium-rich manganese layered positive electrode material for a lithium ion battery, the molecular formula of which is 0.4Li 2 mn 0.6 sn 0.2 Ru 0.2 o 3 0.6LiNi 0.4 mn 0.4 co 0.2 o 2 , its preparation method comprises the following steps:

[0031] S1, dissolving stannous acetate, ruthenium chloride, nickel acetate, cobalt acetate and manganese acetate with a molar ratio of 0.065:0.065:0.2:0.1:0.4 in deionized water to form 0.2mol / L (calculated based on the total amount of metal ions) mixed solution of metal ions;

[0032] S2, drop the metal ion mixed solution into 0.2mol / L oxalic acid solution (compared to the metal ion, oxalic acid is excessive 5%), the dropping rate is 3mL / min, use ammonia water to control the pH value to about 7 during the dropping process , reacted to obtain a precipitate, filtered, washed three times with deionized water, and dried at 80°C to obtain a precursor;

[0033] S3, combining the precursor with e...

Embodiment 2

[0037] The present embodiment provides a lithium-rich manganese layered positive electrode material for a lithium ion battery, the molecular formula of which is: 0.6Li 2 mn 0.8 sn 0.1 Ru 0.1 o 3 0.4LiNi 0.4 mn 0.4 co 0.2 o 2 , its preparation method comprises the following steps:

[0038] S1, dissolving stannous acetate, ruthenium chloride, nickel acetate, cobalt acetate and manganese acetate with a molar ratio of 0.045:0.045:0.12:0.06:0.49 in deionized water to form 0.3mol / L (calculated based on the total amount of metal ions) mixed solution of metal ions;

[0039] S2, drop the metal ion mixed solution into 0.3mol / L oxalic acid solution (compared to the metal ion, the oxalic acid excess is 5%), the dropping rate is 5mL / min, use ammonia water to control the pH value to about 7 during the dropping process , reacted to obtain a precipitate, filtered, washed three times with deionized water, and dried at 80°C to obtain a precursor;

[0040] S3, combining the precursor w...

Embodiment 3

[0044] This embodiment provides a lithium-rich manganese layered positive electrode material for lithium ion batteries, the molecular formula of which is: 0.5Li 2 mn 0.7 sn 0.15 Ru 0.15 o 3 0.5LiNi 0.4 mn 0.4 co 0.2 o 2 . Its preparation method comprises the following steps:

[0045] S1, dissolving stannous acetate, ruthenium chloride, nickel acetate, cobalt acetate and manganese acetate with a molar ratio of 0.06:0.06:0.16:0.08:0.44 in deionized water to form 0.15mol / L (calculated based on the total amount of metal ions) mixed solution of metal ions;

[0046] S2, drop the metal ion mixed solution into 0.15mol / L oxalic acid solution (compared to the metal ion, oxalic acid is excessive 5%), the dropping rate is 8mL / min, use ammonia water to control the pH value to about 7 during the dropping process , reacted to obtain a precipitate, filtered, washed three times with deionized water, and dried at 80°C to obtain a precursor;

[0047]S3, combining the precursor with ex...

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Abstract

The invention belongs to the field of electrochemical material technology and particularly relates to a lithium-manganese-rich laminated anode material for a lithium ion battery. A molecular formula of the material is xLi2Mn1-y-zSnyRuzO3.(1-x)LiNi0.4Mn0.4Co0.2O2, wherein x is greater than 0 but is smaller than 1, y and z are greater than 0.1 but is smaller than 0.5. Compared with the prior art, the prepared lithium-manganese-rich laminated anode material for the lithium ion battery is high in specific capacity, high in initial charge-discharge efficiency, stable in structure and small in voltage failure and has a very good application development prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemical materials, in particular to a lithium-rich manganese layered positive electrode material (xLi 2 mn 1-y-z sn y Ru z o 3 ·(1-x)LiNi 0.4 mn 0.4 co 0.2 o 2 , 0<x<1, 0.1<y<0.5, 0.1<z<0.5) and a preparation method thereof. Background technique [0002] The rapid development of lithium-ion battery technology requires higher energy density to meet market demand. The current anode materials for industrial applications are mainly: lithium cobaltate, lithium manganate, lithium nickel cobalt manganate and lithium iron phosphate, etc., and the actual specific capacity is 100-180mAh / g, which cannot meet the requirements of high energy density lithium-ion batteries. Require. Lithium-rich manganese layered cathode material (chemical formula is xLi 2 MnO 3 ·(1-x)LiMO 2 (0<x<1, M=at least one of transition metals such as Ni, Co, Mn, Fe)) is low in cost and has a high dis...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周训富宋晓娜邓耀明王正黄象金张志勇常嵩李中廷张新河赵玲
Owner DONGGUAN MCNAIR NEW POWER
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