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Anode material zirconium and phosphor adulterated lithium cobaltate of lithium ion secondary battery and its making method

A secondary battery and positive electrode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as increased internal resistance of batteries, poor cycle performance, and surface structure damage, and achieve improved cycle performance and safety performance , Improve structural stability and ensure uniformity

Active Publication Date: 2008-03-26
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most of the current commercial lithium-ion batteries use pure lithium cobalt oxide without doping, the surface structure is unstable, which makes the lithium-ion battery decay quickly, the cycle performance is poor, and the surface structure is prone to damage during the cycle. , causing the internal resistance of the battery to increase. In the case of severe charging and discharging or short circuit, the accumulated heat will increase the temperature of the battery. When it reaches about 200 ° C, the positive electrode material will react with the electrolyte to release oxygen, which will increase the pressure and cause the battery to explode; Thus affecting the cycle performance and safety of lithium-ion batteries

Method used

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  • Anode material zirconium and phosphor adulterated lithium cobaltate of lithium ion secondary battery and its making method
  • Anode material zirconium and phosphor adulterated lithium cobaltate of lithium ion secondary battery and its making method

Examples

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Effect test

Embodiment 1

[0020] A lithium ion secondary battery cathode material zirconium, phosphorus doped lithium cobalt oxide, its chemical formula is:

[0021] LiZr x co (1-x-y) P y o 2 , where x=0.02, y=0.04, has a layered structure.

[0022] The preparation method of the above-mentioned lithium ion secondary battery cathode material zirconium, phosphorus doped lithium cobalt oxide comprises the following steps:

[0023] 1). According to the atomic ratio of lithium and cobalt of 1.03:1.00, 2000.0 grams of cobalt carbonate and 687.6 grams of lithium hydroxide were mixed uniformly;

[0024] 2). Put the mixed raw materials into a roasting furnace, and roast them in an air atmosphere. The roasting temperature is 900°C, and the roasting time is 12 hours;

[0025] 3). Grinding the calcined lithium cobalt oxide, the average particle size of the powder is D 50 10 ~ 12um;

[0026] 4). Put 1000.0 grams of lithium cobaltate powder into the reaction kettle, add 2000.0 grams of water and stir to form ...

Embodiment 2

[0031] A lithium ion secondary battery cathode material zirconium, phosphorus doped lithium cobalt oxide, its chemical formula is:

[0032] LiZr x co (1-x-y) P y o 2 Where x=0.01, y=0.02, it has a layered structure.

[0033] The preparation method of the above-mentioned lithium ion secondary battery cathode material zirconium, phosphorus doped lithium cobalt oxide comprises the following steps:

[0034] 1). According to the atomic ratio of lithium and cobalt of 1.02:1.00, 1000.0 grams of tricobalt tetroxide and 470.1 grams of lithium carbonate are uniformly mixed;

[0035] 2). Put the mixed raw materials into a roasting furnace and roast in an air atmosphere at a roasting temperature of 800°C and a roasting time of 24 hours;

[0036] 3). Grinding the calcined lithium cobalt oxide, the average particle size of the powder is D 50 6 ~ 8um;

[0037] 4). Put 1,000.0 grams of lithium cobaltate powder into the reaction kettle, add 1,000.0 grams of water and stir to form a slur...

Embodiment 3

[0042] A lithium ion secondary battery cathode material zirconium, phosphorus doped lithium cobalt oxide, its chemical formula is:

[0043] LiZrx co (1-x-y) P y o 2 , where x=0.03, y=0.06, has a layered structure.

[0044] The preparation method of the above-mentioned lithium ion secondary battery cathode material zirconium, phosphorus doped lithium cobalt oxide comprises the following steps:

[0045] 1). According to the atomic ratio of lithium and cobalt of 0.98:1.00, 1000.0 grams of cobalt tetroxide and 451.6 grams of lithium carbonate were mixed uniformly;

[0046] 2). Put the mixed raw materials into a roasting furnace, and roast in an air atmosphere, the roasting temperature is 1000°C, and the roasting time is 6 hours;

[0047] 3). Grinding the calcined lithium cobalt oxide, the average particle size of the powder is D 50 13 ~ 15um;

[0048] 4). Put 1,000.0 grams of lithium cobaltate powder into the reaction kettle, add 3,000.0 grams of water and stir to form a slu...

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Abstract

This invention relates to LiCoO2 doped with Zr and P, positive material of Li ionic secondary cells and its preparation method characterizing that the chemical formula is: LiZrxCo(1-x-y)PyO2, in which, it is a laminated structure, and x=0.001-0.003, y=0.02-06, the preparation steps are as folow: 1, mixing Co3O4, CoCO3 or CoC2O4 with Li2CO3 or LiOH in the atomic ratio of Li and Co(0.9801.05) :1.00, 2, baking it for 6-24h under 600-1000deg.C, 3, crushing LiCoO2 to particles of 6-15mum, 4, mixing the LiCoO2 and water 1-3times weight into pulp, 5, adding ZrNO3 and phosphate at the same time, 6, spraying and drying it, 7, baking it for 4-12h under 600-1000deg.C, 8, crushing the doped LiCoO2 to particles of 6-15mum.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion secondary batteries, in particular to zirconium and phosphorus-doped lithium cobalt oxide, a positive electrode material for lithium ion secondary batteries, and a preparation method thereof. Background technique [0002] With the rapid development of modern information technology, portable electronic products such as mobile phones, notebook computers and digital cameras have increasingly strong demand for cost-effective batteries. Due to the advantages of high energy density and no memory effect, lithium-ion secondary batteries have been widely used in the field of portable electrical appliances. However, since most of the current commercial lithium-ion batteries use pure lithium cobalt oxide without doping, the surface structure is unstable, which makes the lithium-ion battery decay quickly, the cycle performance is poor, and the surface structure is prone to damage du...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48C01G51/00C01B25/45H01M4/525
CPCY02E60/12Y02E60/10
Inventor 周大桥吴孟涛孟凡玉吕超陈菁菁
Owner TIANJIN B&M SCI & TECH
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