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A high nickel ternary lithium battery cathode material with concentration gradient and a preparation method thereof

A ternary lithium battery, concentration gradient technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems affecting safety performance and stability performance, poor cycle formation, poor high temperature performance, etc., to achieve low capacity loss and high performance The effect of stability and excellent battery performance

Inactive Publication Date: 2019-01-18
CHENDU NEW KELI CHEM SCI CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0009] According to the above, the high-nickel ternary positive electrode materials used for lithium batteries in the existing solutions have defects such as poor cycle performance and poor high-temperature performance, which lead to serious capacity loss and poor cycle formation of lithium batteries during deep charge and discharge. Affected safety performance and stability performance

Method used

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  • A high nickel ternary lithium battery cathode material with concentration gradient and a preparation method thereof

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Embodiment 1

[0031]Mix basic nickel carbonate and cobalt carbonate according to the molar ratio of nickel: cobalt 6:1, mix and ball mill them, place them in a ceramic crucible and heat them at 1800°C, and after the mixture is fully melted, use basic nickel carbonate containing a small amount of cobalt carbonate Nickel carbonate crystals are pulled and grown, and cobalt carbonate is added to the crucible to increase the cobalt content while pulling and growing, until the molar ratio of nickel and cobalt in the crucible is 1:1, the growth stops, and the temperature is slowly cooled to room temperature to obtain a concentration gradient. The basic nickel carbonate / cobalt carbonate material is mixed with manganese oxide and lithium carbonate, and then pre-fired, sintered, and carbon-coated to obtain a high-nickel ternary lithium battery cathode material with a concentration gradient. The amount of manganese source is added according to the nickel: manganese molar ratio of 9:1, and the amount of...

Embodiment 2

[0033] After mixing nickel chloride and cobalt chloride according to the molar ratio of nickel:cobalt 8:1, put them into a ceramic crucible for heating, and the heating temperature is 2000°C. After the mixture is fully melted, use chlorine containing a small amount of cobalt chloride The nickel crystal is pulled and grown, and cobalt chloride is added to the crucible to increase the cobalt content while pulling and growing, until the molar ratio of nickel and cobalt in the crucible is 1:1, the growth stops, and the temperature is slowly cooled to room temperature to obtain a concentration gradient. The nickel chloride / cobalt chloride material is mixed with manganese oxide and lithium sulfate, and then pre-fired, sintered, and carbon-coated to obtain a high-nickel ternary lithium battery cathode material with a concentration gradient. The amount of manganese source is added according to the nickel: manganese molar ratio of 9:1, and the amount of lithium source is added according...

Embodiment 3

[0035] After mixing nickel oxide and cobalt oxide according to the molar ratio of nickel: cobalt 8:1, put them into a ceramic crucible and heat them at a temperature of 2000°C. After the mixture is fully melted, use nickel oxide crystals containing a small amount of cobalt oxide. Pulling growth, adding cobalt oxide to the crucible to increase the cobalt content while pulling the growth, until the molar ratio of nickel and cobalt in the crucible is 1:1, the growth stops, slowly cool down to room temperature, and obtain nickel oxide / oxide with concentration gradient Cobalt material, after mixing with manganese oxide and lithium carbonate, pre-sintering, sintering, carbon coating and other processes, can obtain a high-nickel ternary lithium battery positive electrode material with a concentration gradient. The amount of manganese source is added according to the nickel: manganese molar ratio of 9:1, and the amount of lithium source is added according to the nickel: lithium molar r...

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Abstract

The invention discloses a high-nickel ternary lithium battery cathode material with concentration gradient and a preparation method thereof. The preparation method comprises the following steps: A nickel source and a cobalt source are mixed and melted, Czochralski growth was carried out using nickel source crystals containing a small amount of cobalt source, and the concentration of cobalt sourcewas gradually increased to form nickel source / cobalt source crystals with concentration gradient. The nickel source / cobalt source crystals with concentration gradient were mixed with manganese sourceand lithium source, and sintered to obtain high nickel ternary lithium battery cathode materials with concentration gradient. The high nickel ternary lithium battery cathode material prepared by the method has low capacity loss, stable performance and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, and in particular to a high-nickel ternary lithium battery cathode material with a concentration gradient and a preparation method thereof. Background technique [0002] Lithium batteries have excellent properties such as environmental protection and no memory effect, and have become one of the most popular new energy sources in the 21st century. Among them, high-nickel ternary materials have higher theoretical capacity and better working stability, and are currently an important direction for lithium battery research. However, due to its high nickel content, it is easy to cause side reactions with the electrolyte and other disadvantages, which limits its application in the direction of industrialization. Improvements to address this shortcoming include surface coating and concentration gradient control. [0003] Patent CN103700845A proposes a preparation method for the positive elect...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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