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Li-rich Fe-Mn based cathode material for lithium ion battery and preparation method of Li-rich Fe-Mn based cathode material

An ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of mixed cation, low tap density, poor cycle stability, etc., to achieve high working voltage, fine particles, The effect of low cost of production raw materials

Inactive Publication Date: 2014-03-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are also disadvantages such as mixed cations, low tap density, and insufficient cycle stability.

Method used

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  • Li-rich Fe-Mn based cathode material for lithium ion battery and preparation method of Li-rich Fe-Mn based cathode material
  • Li-rich Fe-Mn based cathode material for lithium ion battery and preparation method of Li-rich Fe-Mn based cathode material
  • Li-rich Fe-Mn based cathode material for lithium ion battery and preparation method of Li-rich Fe-Mn based cathode material

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Embodiment 1

[0031] Embodiment 1: The lithium-rich Fe-Mn base lithium ion battery cathode material that the present embodiment makes is: chemical formula is Li 1.2 mn 0.4 Fe 0.4 o 2 , the structure is layered α-NaFeO 2 structure and rock-salt structure, layered α-NaFeO 2 The space group of the structure is R m, the space group of the rock-salt structure is Fm m. Layered α-NaFeO 2 The volume percentage of the structure is 40%.

[0032] The preparation method of this embodiment is:

[0033] (1) According to Li 1.2 mn 0.4 Fe 0.4 o 2 The stoichiometric ratio of manganese chloride and ferric nitrate is mixed with the iron-manganese metal cation solution that cation concentration is 10wt%, lithium hydroxide is mixed with the concentration and is the lithium salt solution of 20wt%, in the lithium salt solution, add the lithium salt solution 10vol% ethanol as antifreeze;

[0034] (2) Add the iron-manganese metal cation solution dropwise into the lithium salt solution, keep the pH v...

Embodiment 2

[0038] Embodiment 2: the lithium-rich Fe-Mn base lithium ion battery cathode material that the present embodiment makes is: chemical formula is Li 1.2 mn 0.4 Fe 0.4 o 2 , the structure is layered α-NaFeO 2 structure and rock-salt structure, layered α-NaFeO 2 The space group of the structure is R m, the space group of the rock-salt structure is Fm m. Layered α-NaFeO 2 The volume percentage of the structure is 10%.

[0039] The preparation method of this embodiment is:

[0040] (1) According to Li 1.2 mn 0.4 Fe 0.4 o 2 The stoichiometric ratio of manganese acetate and iron acetate is mixed with the iron-manganese metal cation solution that cation concentration is 15wt%, lithium hydroxide is mixed with the concentration and is the lithium salt solution of 10wt%, in lithium salt solution, add the 20vol of lithium salt solution % ethanol as antifreeze;

[0041] (2) Add the iron-manganese metal cation solution dropwise into the lithium salt solution, keep the pH valu...

Embodiment 3

[0045] Embodiment 3: the lithium-rich Fe-Mn base lithium ion battery cathode material that the present embodiment makes is: chemical formula is Li 1.2 mn 0.4 Fe 0.4 o 2 , the structure is layered α-NaFeO 2 structure and rock-salt structure, layered α-NaFeO 2 The space group of the structure is R m, the space group of the rock-salt structure is Fm m. Layered α-NaFeO 2 The volume percentage of the structure is 70%.

[0046] The preparation method of this embodiment is:

[0047] (1) According to Li 1.2 mn 0.4 Fe 0.4 o 2 The stoichiometric ratio of manganese sulfate, ferric chloride is mixed with cationic concentration and is the iron manganese metal cation solution of 13wt%, lithium hydroxide is mixed with the concentration and is the lithium salt solution of 30wt%, in the lithium salt solution, add the lithium salt solution 13vol% ethanol as antifreeze;

[0048] (2) Add the iron-manganese metal cation solution dropwise into the lithium salt solution, keep the pH ...

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Abstract

The invention relates to a Li-rich Fe-Mn based cathode material for a lithium ion battery and a preparation method of the Li-rich Fe-Mn based cathode material, and belongs to the technical field of lithium ion batteries. The chemical formula of a lithium manganese iron oxygen cathode material solid solution is Li1.2Mn0.4Fe0.4O2, the lithium manganese iron oxygen cathode material solid solution adopts a layered alpha-NaFeO2 structure and a rock salt structure, the space group of the layered alpha-NaFeO2 structure is R3m, and the space group of the rock salt structure is Fm3m. The Li-rich Fe-Mn based cathode material is prepared through three steps of coprecipitation, hydrothermal reaction and solid phase sintering: firstly, the hydroxide of ferro-manganese is prepared through a coprecipitation method, and the reaction pH value and temperature are controlled, the hydroxide precursor of ferro-manganese is mixed with lithium hydroxide, a mineralizer and potassium chlorate for hydrothermal reaction for 8-48 hours at a temperature of 220 DEG C, and then mixed with a certain amount of lithium hydroxide, and sintering is performed for 16-20 hours at a temperature of 500-750 DEG C, so that ferro-manganese-based solid solution cathode material with high capacity is prepared. The technological process is simple, the operation is convenient, and particle size of crystals can be controlled well.

Description

technical field [0001] The invention relates to a lithium-rich Fe-Mn-based lithium ion battery cathode material and a preparation method thereof, belonging to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion secondary batteries have been widely used in many fields such as portable electronic devices since their commercialization. LiCoO2 occupies an important position in the market due to its high voltage and stable electrochemical performance. However, cobalt resources are relatively scarce and expensive, which limits Its application; LiNiO2 theoretical capacity is 275mAh / g, its actual capacity is 200mAh / g, and nickel reserves are richer than cobalt, and the price is low, but its synthesis conditions are harsh, and non-stoichiometric products are easy to be generated during the preparation process. Compared with LiNiO2, it is mainly reflected in the dislocation of lithium ions and nickel ions and the state of lithium deficiency and nick...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122H01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张英杰杨瑞明董鹏夏书标张雁南宋凡子
Owner KUNMING UNIV OF SCI & TECH
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