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Phosphorus-doped ternary lithium ion positive electrode material, preparation method thereof and lithium ion battery

A cathode material, lithium ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor battery cycle performance, achieve uniform shape, and improve the efficiency of initial charge and discharge.

Pending Publication Date: 2021-04-09
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a phosphorus-doped ternary lithium-ion positive electrode material and its preparation method, and a lithium-ion battery to solve the problem of poor cycle performance of the battery formed by the existing nickel-cobalt-manganese ternary material

Method used

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  • Phosphorus-doped ternary lithium ion positive electrode material, preparation method thereof and lithium ion battery
  • Phosphorus-doped ternary lithium ion positive electrode material, preparation method thereof and lithium ion battery
  • Phosphorus-doped ternary lithium ion positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0022] As described in the background art, the current lithium-ion positive electrode materials have the problem that the preparation process is strict and the cycle performance of the produced battery cannot be greatly improved. In order to solve this problem, the present invention creatively improves the preparation process, performs the doping reaction in stages, and precisely controls the reaction conditions of each stage, thereby forming a positive electrode material with uniform shape. Specifically, the preparation method of the phosphorus-doped ternary lithium ion positive electrode material provided by the present invention includes: step S1, dissolving nickel source, cobalt source, manganese source and phosphorus source in a solvent to obtain a mixed solution; step S2, In an inert environment, the above mixed solution is reacted in stages at different pH values ​​to obtain a precursor; in step S3, the precursor is mixed with a lithium source and sintered to obtain a ph...

Embodiment 1

[0038] The preparation method of the phosphorus-doped ternary lithium ion positive electrode material provided in this embodiment comprises the following steps:

[0039] 1) With nickel sulfate, cobalt sulfate, manganese sulfate, phosphoric acid H 3 PO 4 As raw material, the content of phosphorus source is 2wt% of the total mass of nickel source, cobalt source and manganese source, according to the molar ratio of metal nickel: cobalt: manganese 0.8: 0.05: 0.01, add it into deionized water, and make a mixed salt solution 2mol / L, placed in a continuous reactor;

[0040] 2) ammoniacal liquor and flake sodium hydroxide are prepared into 8molL and 4mol / L respectively for subsequent use;

[0041] 3) Use the pH online control system and the continuous reactor to react for a period of time: an inert environment is formed by a high-purity inert gas with a flow rate of 0.6L / h, the flow rate of the fixed mixed salt solution is 1.8L / h, and the reaction temperature is 50°C. Stirring spe...

Embodiment 2

[0045] The difference between the preparation method provided by this embodiment and Example 1 is:

[0046] Adjust the concentration of ammonia water to 0.4mol / L, and control the pH value to 11.8. After reacting for 20 minutes, adjust the concentration of ammonia water to 0.5mol / L, and lower the pH value to 11.

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Abstract

The invention provides a phosphorus-doped ternary lithium ion positive electrode material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: S1, dissolving a nickel source, a cobalt source, a manganese source and a phosphorus source into a solvent to obtain a mixed solution; S2, in an inert environment, enabling the mixed solution to be subjected to a staged reaction under different pH values to obtain a precursor; and S3, mixing the precursor with a lithium source, and performing sintering to obtain the phosphorus-doped ternary lithium ion positive electrode material. The phosphorus-doped ternary lithium ion positive electrode material prepared by the method is uniform in form, and no aggregation phenomenon exists among particles, so that the first charge-discharge efficiency of the lithium ion battery and the cycle performance of the battery are improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a phosphorus-doped ternary lithium ion positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Nickel-cobalt-manganese ternary materials have always been a research hotspot in the new energy industry because of their high energy density, especially high-nickel materials with a nickel content greater than 80% have become the mainstream of the new generation of power battery industry. with LiCoO 2 Similarly, nickel-cobalt-manganese ternary materials have a layered structure. Ni, Mn, and Co randomly occupy the 3b position, and oxygen atoms occupy the 6c position, forming MO 6 Octahedral, with Li atoms occupying the 3a position, forming LiO 6 eight bodies. Li + Located between the MO6 octahedral layers, it can be reversibly embedded and extracted between the layers. [0003] The three elements of nickel, cobalt and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 邓赛君徐德雷程阿鸿李海军蔡惠群
Owner YINLONG ENERGY CO LTD
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