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Method for coating conductive polymer on Ni-Co-Mn acid lithium positive electrode material

A conductive polymer, nickel cobalt lithium manganate technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unstable electrochemical performance, poor battery cycle performance, high heat treatment temperature, and achieve electrical conductivity and electrochemical performance. Performance improvement, high specific capacity, uniform coating effect

Active Publication Date: 2015-03-25
DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used coating material is conductive carbon, but in the surface carbon coating method, there are usually disadvantages such as long operation time, uneven mixing, high subsequent heat treatment temperature, and the need for inert gas protection.
At present, there is no related report on coating conductive polymer on the surface of nickel-cobalt-lithium manganese oxide to improve the poor cycle performance and unstable electrochemical performance of electrode materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for coating a positive electrode material of nickel cobalt manganate lithium with conductive polymer, comprising the following steps:

[0022] (1) Mix nickel carbonate, cobalt carbonate, manganese carbonate and lithium carbonate compounds according to the ratio of the amount of nickel, cobalt, manganese, and lithium elements in a ratio of 1:1:1:1, and press solid-liquid weight at room temperature Ratio of 1:5 was added to deionized water and mixed evenly, then mechanically activated, and the rotating speed was adjusted to be 150r / min in the stirring mill for stirring and mixing, and the mixture was mixed for 4 hours to obtain (LiNi 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 4 Precursor mixture;

[0023] (2) to (LiNi 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 4 The content of adding polyaniline in the precursor mixed liquid is the polyaniline aqueous solution of 2wt%, stirs evenly and the pH value of mixed solution is adjusted to be 6, wherein the total weight of nickel carbonate, cobalt carb...

Embodiment 2

[0027] A method for coating a positive electrode material of nickel cobalt manganate lithium with conductive polymer, comprising the following steps:

[0028] (1) Mix nickel acetate, cobalt acetate, manganese acetate and lithium acetate compound according to the ratio of the amount of nickel, cobalt, manganese, and lithium elements in a ratio of 1:1:1:1.2, and press solid-liquid weight at room temperature The ratio of 1:10 was added to deionized water and mixed evenly, then mechanically activated, and the rotating speed was adjusted to be 200r / min in the stirring mill for stirring and mixing, and the mixture was mixed for 8 hours to obtain (LiNi 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 4 Precursor mixture;

[0029] (2) to (LiNi 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 4 Add a polypyrrole organic solution with a polypyrrole content of 2 to 3 wt% in the precursor mixed solution, wherein the solvent is xylene, stir well and adjust the pH value of the mixed solution to 8, wherein nickel acetate, cobalt acet...

Embodiment 3

[0033] A method for coating a positive electrode material of nickel cobalt manganate lithium with conductive polymer, comprising the following steps:

[0034] (1) Mix nickel nitrate, cobalt nitrate, manganese nitrate and lithium hydroxide compound according to the ratio of the amount of nickel, cobalt, manganese and lithium elements in a ratio of 1:1:1:1, and press solid-liquid at room temperature The weight ratio of 1:7 was added to deionized water and mixed evenly, then mechanically activated, and the rotating speed was adjusted to be 180r / min in the stirring mill for stirring and mixing, and the mixture was mixed for 6 hours to obtain (LiNi 1 / 3 co1 / 3 mn 1 / 3 )(OH) 4 Precursor mixture;

[0035] (2) to (LiNi 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 4 The content of adding polypyrrole to the precursor mixed liquid is 3wt% polypyrrole aqueous solution, stir well and adjust the pH value of the mixed solution to 7, wherein, the total weight of nickel nitrate, cobalt nitrate, manganese nitrat...

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PUM

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Abstract

The invention discloses a method for coating a conductive polymer on a Ni-Co-Mn acid lithium positive electrode material, and relates to the technical field of electrode materials of lithium ion batteries and preparation. The method comprises the following steps: (1) preparing LiNi1 / 3Co1 / 3Mn1 / 3 precursor mixed liquid by means of mechanical activation; (2) adding aqueous solution or organic solution of the conductive polymer into the LiNi1 / 3Co1 / 3Mn1 / 3 precursor mixed liquid; (3) performing spray drying on the mixture prepared in the step (2) to obtain precursor powder which is uniformly mixed; and (4) calcining the precursor powder which is subjected to jolt ramming or compaction, and cooling to a room temperature to obtain a conductive polymer coated Ni-Co-Mn acid lithium positive electrode material. According to the method, the conductive polymer is coated on the surface of the Ni-Co-Mn acid lithium positive electrode material, the dissolution of transition metals in the positive electrode material in electrolytes during charging / discharging circulation is inhibited, and the battery cycle performance and capacity retention ratio of the positive electrode material are improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery electrode materials and preparation thereof, in particular to a method for coating nickel-cobalt lithium manganese oxide cathode materials with conductive polymers. Background technique [0002] With the continuous progress of society, people have continuously put forward a series of new requirements for chemical power sources such as light weight, small size, high energy, safe use and environmental friendliness. Traditional chemical batteries are far from being able to meet these requirements, so research and development of new chemical power sources with high energy density, long service life, safety and pollution-free has become an urgent requirement. The secondary lithium-ion battery is a new type of high-energy battery with lithium-intercalated compounds as the positive and negative electrode materials. It has a series of advantages such as high specific energy, high voltage, smal...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/36H01M4/505H01M4/525H01M4/602H01M10/0525Y02E60/10
Inventor 李华成李普良李运姣许虎孔龙陈南雄王春飞
Owner DAXIN MANGANESE MINE BRANCH OF CITIC DAMENG MINING IND
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