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Lithium titanium phosphate-coated LiNi<1/3>Co<1/3>Mn<1/3>O<2> positive electrode material and preparation method therefor

A technology of lithium titanium phosphate and positive electrode materials, applied in the field of electrochemical power sources, to achieve the effect of suppressing side reactions and improving structural stability

Inactive Publication Date: 2017-12-19
CHINA THREE GORGES UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiNi obtained by this preparation method 1 / 3 co 1 / 3 mn 1 / 3 o 2 There is still room for further improvement in the cycle stability of materials

Method used

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  • Lithium titanium phosphate-coated LiNi&lt;1/3&gt;Co&lt;1/3&gt;Mn&lt;1/3&gt;O&lt;2&gt; positive electrode material and preparation method therefor

Examples

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Effect test

Embodiment 1

[0024] Precursor Ni of ternary cathode material obtained by co-precipitation method 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , adding Li to the precursor 2 CO 3 , after ball milling with absolute ethanol as the medium for 6 hours, dried, and sintered at 450 °C for 5 hours, then sintered at 900 °C for 12 hours, cooled and sieved to obtain LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Ternary cathode material. Preparation of Lithium Titanium Phosphate LiTi 2 (PO 4 ) 3 NCM / LTPO cathode material with coating amount of 0.5 wt. %: Take 1g LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material was sonicated in a mixed solution of 20 mL of absolute ethanol and 20 mL of acetone for 20 minutes, stirred to form a black suspension, and then 0.0088 g of tetrabutyl titanate C was added 16 h 36 o 4 Ti, stirred for 60 minutes. Then 10 mL of deionized water was added dropwise and stirred for 60 min. Finally add 0.0045g of ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.0005g lithium hydroxide LiOH·H 2...

Embodiment 2

[0026] Precursor Ni of ternary cathode material obtained by co-precipitation method 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , adding Li to the precursor 2 CO 3 , after ball milling with absolute ethanol as the medium for 6 hours, dried, and sintered at 450 °C for 5 hours, then sintered at 900 °C for 12 hours, cooled and sieved to obtain LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Ternary cathode material. Preparation of Lithium Titanium Phosphate LiTi 2 (PO 4 ) 3 NCM / LTPO cathode material with coating amount of 1 wt. %: Take 1g LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material was sonicated in a mixed solution of 20 mL of absolute ethanol and 20 mL of acetone for 20 minutes, stirred to form a black suspension, and then 0.0176 g of tetrabutyl titanate C was added 16 h 36 o 4 Ti, stirred for 60 minutes. Then 10 mL of deionized water was added dropwise and stirred for 60 min. Finally add 0.0089g of ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.0011g lithium hydroxide LiOH·H 2 O...

Embodiment 3

[0028] Precursor Ni of ternary cathode material obtained by co-precipitation method 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 , adding Li to the precursor 2 CO 3 , after ball milling with absolute ethanol as the medium for 6 hours, dried, and sintered at 450 °C for 5 hours, then sintered at 900 °C for 12 hours, cooled and sieved to obtain LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 Ternary cathode material. Preparation of Lithium Titanium Phosphate LiTi 2 (PO 4 ) 3 NCM / LTPO cathode material with coating amount of 2 wt. %: take 1g LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 The positive electrode material was sonicated in a mixed solution of 20 mL of absolute ethanol and 20 mL of acetone for 20 minutes, stirred to form a black suspension, and then 0.0352 g of tetrabutyl titanate C was added 16 h 36 o 4 Ti, stirred for 60 minutes. Then 10 mL of deionized water was added dropwise and stirred for 60 min. Finally add 0.0178g of ammonium dihydrogen phosphate NH 4 h 2 PO 4 , 0.0022g lithium hydroxide LiOH·H 2 O...

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Abstract

The invention provides a lithium titanium phosphate-coated lithium nickel cobalt manganate LiNi<1 / 3>Co<1 / 3>Mn<1 / 3>O<2> positive electrode material and a preparation method therefor. The preparation method comprises the steps of performing ball milling on a hydroxyl nickel cobalt manganese Ni<1 / 3>Co<1 / 3>Mn<1 / 3>(OH)<2> precursor prepared by a co-deposition method and lithium carbonate Li<2>CO<3> in an absolute ethyl alcohol medium, and then performing calcining on the obtained powder after drying in a muffle furnace, and next, performing cooling and screening to obtain a lithium nickel cobalt manganate LiNi<1 / 3>Co<1 / 3>Mn<1 / 3>O<2> positive electrode material; performing uniform ultrasonic dispersion of the LiNi<1 / 3>Co<1 / 3>Mn<1 / 3>O<2> in the mixed solution of absolute ethyl alcohol and acetone, then adding tetrabutyl titanate C<16>H<36>O<4>Ti and stirring for 60min, next, slowly dropwise adding 10ml of deionized water and stirring for 60min, and finally adding ammonium di-hydrogen phosphate NH<4>H<2>PO<4> and lithium hydroxide LiOH.H<2>O and stirring for 9h; and performing filtering, washing and drying to obtain powder and performing sintering on the obtained powder in the muffle furnace, and next, performing cooling and screening to obtain the lithium titanium phosphate LiTi<2>(PO<4>)<3>-coated LiNi<1 / 3>Co<1 / 3>Mn<1 / 3>O<2> ternary positive electrode material.

Description

technical field [0001] The invention relates to a lithium titanium phosphate coated LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 A cathode material and a preparation method thereof belong to the field of electrochemical power sources. Background technique [0002] Lithium-ion battery (LIB) is a new generation of secondary battery after lead-acid battery, nickel-cadmium battery and nickel-metal hydride battery. It has high working voltage, high specific capacity, small self-discharge, long cycle life, and no memory. Effect, no environmental pollution and wide operating temperature range and other significant advantages, it is considered to be a new type of energy storage device with high capacity and high power, and it is also a green and environmentally friendly power source in the 21st century. It has been widely used in portable electronic devices such as mobile phones and notebook computers, as well as electric vehicles. At present, the commercial cathode material is still mainly LiCo...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M4/04H01M10/0525
CPCH01M4/0404H01M4/043H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 张露露王吉青蒋隆荣杨学林
Owner CHINA THREE GORGES UNIV
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