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Lithium ion battery, anode material and preparation method of anode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficult to achieve stoichiometric ratio, adverse effects of batteries, uneven NiMn ratio, etc., to achieve inhibition of Co dissolution and excellent cycle Performance, the effect of protecting the structural stability

Active Publication Date: 2013-12-25
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] But still there is following shortcoming in above-mentioned method: 1) introduce impurity ion easily: select nickel sulfate, manganese sulfate to carry out co-precipitation as nickel source, manganese source, can inevitably introduce impurity ion SO 4 2- , so as to have an adverse effect on the battery; 2) The proportion of NiMn is uneven: Mn(OH) 2 Easily oxidized to MnO(OH) at high pH during co-precipitation 2 However, "segregation" is formed, so the NiMn stoichiometric ratio in the formed positive electrode material is difficult to achieve the expected

Method used

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  • Lithium ion battery, anode material and preparation method of anode material
  • Lithium ion battery, anode material and preparation method of anode material
  • Lithium ion battery, anode material and preparation method of anode material

Examples

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Embodiment 1

[0049] This example is 0.96LiCoO 2 0.02LiNi 0.4 mn 0.4 Mg 0.2 o 2 0.02LiNi 0.45 mn 1.45 Al 0.1 o 4 A cathode material for lithium-ion batteries with a symbiotic structure, the BET of the cathode material is 0.26m 2 / g,D 50 =15μm, D of small particles fused on the surface 50 = 1 μm.

[0050] The preparation steps of above-mentioned cathode material are:

[0051] 1) According to the chemical dosage ratio Ni:Mn:Mg=0.4:0.4:0.2, a certain mass of nickel acetate, manganese acetate and magnesium nitrate are dissolved in water to form the first mixed solution; citric acid is dissolved in water, and lemon The acid solution is added to the first mixed solution to obtain a second mixed solution; the pH of the second mixed solution is adjusted to be 8;

[0052] 2) A certain quality of Co 3 o 4Added to the second mixed solution, stirred and mixed, evaporated to dryness, and roasted at 700°C for 10h in an air atmosphere to obtain (1-x)Co 3 o 4 x(Ni 0.4 mn 0.4 Mg 0.2 o 2 ...

Embodiment 2

[0057] This example is 0.90LiCoO 2 0.09LiNi 0.45 mn 0.45 La 0.1 o 2 0.01LiNi 0.48 mn 1.4 Mg 0.12 o 4 A cathode material for lithium-ion batteries with a symbiotic structure, the BET of the cathode material is 0.18m 2 / g,D 50 =22μm, D of small particles fused on the surface 50 =0.02μm.

[0058] The preparation steps of above-mentioned cathode material are:

[0059] 1) According to the chemical dosage ratio Ni:Mn:La=0.45:0.45:0.1, a certain mass of nickel nitrate, manganese acetate and lanthanum nitrate are dissolved in isopropanol to form the first mixed solution; gluconic acid is dissolved in water, And adding the gluconic acid solution into the first mixed solution to obtain the second mixed solution; adjusting the pH of the second mixed solution to be 6;

[0060] 2) A certain quality of Co 3 o 4 Added to the second mixed solution, stirred and mixed, evaporated to dryness, and roasted at 400°C for 2h in an air atmosphere to obtain (1-x)Co 3 o 4 x(Ni 0.45 mn ...

Embodiment 3

[0065] This example is 0.9LiCoO 2 0.01LiNi 0.45 mn 0.45 Al 0.05 Sr 0.05 o 2 0.09LiNi 0.4 mn 1.4 Ti 0.2 o 4 A cathode material for lithium-ion batteries with a symbiotic structure, the BET of the cathode material is 0.60m 2 / g,D 50 =7μm, D of small particles fused on the surface 50 =0.1 μm.

[0066] The preparation steps of above-mentioned cathode material are:

[0067] 1) According to the chemical dosage ratio Ni:Mn:Al:Sr=0.45:0.45:0.05:0.05, a certain mass of nickel nitrate, manganese nitrate, aluminum isopropoxide and strontium nitrate are dissolved in isopropanol to form the first mixture solution; citric acid was dissolved in water, and the citric acid solution was added to the first mixed solution to obtain a second mixed solution; the pH of the second mixed solution was adjusted to be 7;

[0068] 2) A certain quality of Co 3 o 4 Add it into the second mixed solution, stir and mix, evaporate to dryness, and roast at 1000 degrees in an oxygen atmosphere for ...

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Abstract

The invention discloses a lithium ion battery anode material and a preparation method of the lithium ion battery anode material, and also discloses a lithium ion battery using the anode material. The material comprises a melting structure formed by layered-layered-spinelle in an intergrowth manner, wherein layered lithium cobalt oxide is used as the inner layer; layered nickel lithium manganate is used as the middle layer; spinelle nickel lithium manganate is used as the outermost layer. The material is prepared in a way that a NiMn oxide is coated on the surface of a precursor Co3O4, and then is subjected to sintering with lithium salt in a mixing manner. Compared with the prior art, the lithium ion battery anode material in the intergrowth structure has higher discharge capacity and excellent cycle performance under high voltage.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a lithium-ion battery anode material with a symbiotic structure, a preparation method thereof, and a lithium-ion battery using the above-mentioned material. Background technique [0002] Lithium-ion batteries generally include a positive electrode sheet, a negative electrode sheet, a separator between the positive and negative electrode sheets, and an electrolyte, wherein the positive electrode sheet includes a positive electrode collector and a positive electrode material distributed on the positive electrode collector, and the negative electrode sheet includes a negative electrode. The current collector and the negative electrode material distributed on the negative electrode current collector. At present, the commonly used lithium ion cathode material is LiCoO 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , LiMn 2 o 4 、LiFePO 4 etc., but these cathod...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/10
Inventor 庞佩佩徐磊敏柳娜王梦邝泉解来勇
Owner DONGGUAN AMPEREX TECH
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