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Method for lanthanum phosphate coated lithium ion battery cathode material nickel cobalt lithium manganate

A nickel-cobalt lithium manganese oxide and ion battery technology, which can be applied to battery electrodes, secondary batteries, circuits, etc., and can solve the problems of reduced cycle performance and capacity retention

Inactive Publication Date: 2016-09-21
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the current technology, as the content of Ni element in ternary Ni-Co-Mn increases, the cycle performance and capacity retention of the material will decrease. It is documented that the use of AlPO 4 、Co 3 PO 4 , SnPO 4 Improve material cycle performance, also useful for Li 3 PO 4 Improving the electrochemical performance of materials, but it is still not passed by LaPO 4 A report on improving the electrochemical performance and cycle performance of lithium-ion batteries by coating ternary materials

Method used

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  • Method for lanthanum phosphate coated lithium ion battery cathode material nickel cobalt lithium manganate
  • Method for lanthanum phosphate coated lithium ion battery cathode material nickel cobalt lithium manganate

Examples

Experimental program
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Embodiment 1

[0024] (1) Weigh 0.7388g (0.01mol) of lithium carbonate, 0.3879g (0.9mmol) of lanthanum nitrate hexahydrate, 1.4499g (0.9mmol) of ammonium dihydrogen phosphate and 1.7427g (0.019mol) of Ni 0.5 co 0.2 mn 0.3 (OH) 2 Ternary material precursor, add the ternary precursor, lithium carbonate, lanthanum salt, and phosphate into the high-speed mixer, stir at 500rpm for 4h to obtain a uniform sample;

[0025] (2) Heat and sinter the obtained sample at 750°C in the air for 20h, keep it warm for 10h after sintering, and obtain the modified nickel-cobalt lithium manganate ternary positive electrode material after cooling, that is, LaPO 4 Coated lithium-ion battery positive electrode material nickel cobalt lithium manganese oxide (lithium ion battery positive electrode material nickel cobalt lithium manganese oxide element composition is LiNi 0.5 co 0.2 mn 0.3 o 2 ). where LaPO 4 The weight accounts for the total weight of nickel cobalt lithium manganese oxide, the positive electro...

Embodiment 2

[0028] (1) Weigh 0.7388g (0.01mol) of lithium carbonate, 0.1552g (0.4mmol) of lanthanum acetate tetrahydrate, 0.4392g (0.04mmol) of diammonium hydrogen phosphate and 1.8398g (0.02mol) of Ni 0.6 co 0.2 mn 0.2 (OH) 2 Ternary material precursor, add the ternary precursor, lithium carbonate, lanthanum salt, and diammonium hydrogen phosphate into a high-speed mixer, and stir at 2000rpm for 1 hour to obtain a uniform sample;

[0029] (2) Heat and sinter the obtained sample at 1200°C in the air for 6h, keep it warm for 6h after sintering, and obtain the modified nickel-cobalt lithium manganate ternary positive electrode material after cooling, that is, LaPO 4 Coating lithium-ion battery positive electrode material nickel cobalt lithium manganese oxide, (the elemental composition of lithium ion battery positive electrode material nickel cobalt lithium manganese oxide is LiNi 0.6 co 0.2 mn 0.2 o 2 ) where LaPO 4 The weight accounts for the total weight of nickel cobalt lithium m...

Embodiment 3

[0032](1) Weigh 0.2394g (0.01mol) of lithium hydroxide, 0.006g (0.2mmol) of lanthanum nitrate hexahydrate, 0.0245g (0.2mmol) of ammonium dihydrogen phosphate and 0.869g (0.009mol) of Ni 0.8 co 0.1 mn 0.1 (OH) 2 Ternary material precursor, add the ternary precursor, lithium hydroxide, lanthanum salt, and ammonium dihydrogen phosphate into a high-speed mixer, and stir at 1200rpm for 3 hours to obtain a uniform sample;

[0033] (2) The obtained sample was heated and sintered at 1000°C for 12 hours in a pure oxygen atmosphere, kept for 5 hours after sintering, and the modified nickel-cobalt lithium manganese oxide ternary positive electrode material was obtained after cooling, that is, LaPO 4 Coating lithium-ion battery positive electrode material nickel cobalt lithium manganese oxide, (the elemental composition of lithium ion battery positive electrode material nickel cobalt lithium manganese oxide is LiNi 0.8 co 0.1 mn 0.1 o 2 ) where LaPO 4 The weight accounts for the to...

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Abstract

The invention relates to a method for lanthanum phosphate coated lithium ion battery cathode material nickel cobalt lithium manganate. The lanthanum phosphate cladding method comprises the following steps: (1) adding a ternary precursor, a lithium salt, a lanthanum salt and phosphate into a high-speed material mixing machine, and stirring for 1-4 h at the speed of 500-2000 rpm; and (2) heating materials treated in the first step in an oxygen-containing atmosphere of 750-1200 DEG C for 5 to 20 hours, preserving the temperature for 4-10 h, and cooling to obtain the lanthanum phosphate coated lithium ion battery cathode material nickel cobalt lithium manganate. According to the method, an LaPO4 compound in an amorphous state can be formed on the surface of a nickel cobalt lithium manganate ternary cathode material, and the LaPO4 in the amorphous state is coated on the surface of the nickel cobalt lithium manganate ternary cathode material, so that the content of impurity lithium can be effectively reduced, and the cycle performance and electrochemical performance of a lithium ion battery under high voltage can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a modified nickel-cobalt lithium manganate ternary positive electrode material and a preparation method thereof. Background technique [0002] Nickel-cobalt lithium manganate ternary cathode material is currently the most developed due to its advantages of high discharge specific capacity, good safety, low price, high discharge voltage, high specific energy, long cycle life, good safety and environmental friendliness. A portable chemical power source in the foreground. Its main component is lithium intercalation compound cathode material, which occupies a large proportion in lithium-ion batteries, and the quality of cathode materials determines the performance indicators of lithium-ion battery products, and has become a bottleneck restricting the development of high-performance lithium-ion batteries. With the rapid popularization of portable electronic devices, the...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 郑俊超汤林波张宝李晖童汇
Owner CENT SOUTH UNIV
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