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A high-rate layered lithium-rich manganese-based positive electrode material and its preparation method

A cathode material, a lithium-rich manganese-based technology, which is applied in the field of cathode materials for lithium ion batteries and their preparation, can solve the problems of generating impurity phases, precursors and final products with many and complex morphologies, and achieves the effect of high rate performance.

Active Publication Date: 2021-02-09
JIANGSU DANGSHENG MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also has the following problems: First, due to the high content of manganese, divalent manganese is easily oxidized to a higher valence state under alkaline conditions, thereby producing an impurity phase; second, factors that affect the morphology of the precursor and the final product Many and complex, difficult to control product morphology
However, it is difficult to form a morphology that is conducive to lithium ion transport by ball milling, so it is difficult to greatly improve the rate performance of the product.

Method used

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  • A high-rate layered lithium-rich manganese-based positive electrode material and its preparation method
  • A high-rate layered lithium-rich manganese-based positive electrode material and its preparation method
  • A high-rate layered lithium-rich manganese-based positive electrode material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 27.50 g of MnSO 4 ×H 2 O, 10.31 g of NiSO 4 ×7H 2 O and 11.02 g of CoSO 4 ×7H 2 O was dissolved in 160 mL of deionized water to obtain a transparent solution I; 19.29 g of NaOH, 5.473 g of 25% concentrated ammonia by mass percent and 2.064 mL of hydrazine hydrate were dissolved in 160 mL of deionized water to obtain a colorless and transparent Solution II.

[0028] (2) In the water bath temperature is 45 o C, with a mechanical stirring speed of 800 rpm and a pass with N 2 Under certain conditions, solution I and solution II were added dropwise to the reaction kettle at the same time with a peristaltic pump at a rate of 5 mL / min. After the dropwise addition, aged for 12 h, filtered with suction, and washed with deionized water several times to remove Unreacted ions at 55 o C drying in an oven for 12 h to obtain the transition metal composite hydroxide precursor.

[0029] (3) Put the transition metal composite hydroxide precursor obtained in step (2) into a p...

Embodiment 2

[0034] (1) 142.41 g of Mn(CH 3 COO) 2 ×4H 2 O, 34.84 g of Co(CH 3 COO) 2 ×4H 2 O and 34.81 g of Ni(CH 3 COO) 2 ×4H 2 O was dissolved in 300 mL deionized water to obtain a transparent solution 1; 68.86 g of NaOH and 14.78 g of concentrated ammonia water with a mass percentage concentration of 25% and 7.14 g of hydroxylamine were dissolved in 300 mL of deionized water to obtain a colorless and transparent Solution II.

[0035] (2) In the water bath temperature is 55 o C. Under the condition of mechanical stirring speed of 700 rpm and the presence of Ar, solution I and solution II were added dropwise to the reaction kettle with a peristaltic pump at a rate of 8 mL / min. After the addition was completed, aged for 6 h, pumped Filtered, washed several times with deionized water to remove unreacted ions, at 60 o C oven was dried for 8 h to obtain the transition metal composite hydroxide precursor.

[0036] (3) Put the transition metal composite hydroxide precursor obtained ...

Embodiment 3

[0039] (1) 277.3 g of 50% Mn(NO 3 ) 2 , 54.24 g of Ni(NO 3 ) 2 ×6H 2 O, 54.24g of Co(NO 3 ) 2 ×6H 2 O was dissolved in 200 mL of deionized water to obtain a transparent solution I; 128.77 g of KOH and 31.86 g of concentrated ammonia water with a concentration of 25% by mass and 6.372 g of hydrazine hydrate were dissolved in 200 mL of deionized water to obtain a colorless transparent solution II.

[0040] (2) In the water bath temperature is 40 o C, with a mechanical stirring speed of 600 rpm and a pass with N 2 Under certain conditions, solution I and solution II were added dropwise to the reaction kettle at the same time with a peristaltic pump at a rate of 7 mL / min. After the dropwise addition, aged for 9 h, suction filtered, and washed with deionized water for several times to remove untreated Reactive ions at 70 o C oven was dried for 6 h to obtain the transition metal composite hydroxide precursor.

[0041] (3) Put the transition metal composite hydroxide precu...

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Abstract

The invention relates to a high-rate layered lithium-rich manganese-based positive electrode material and a preparation method thereof, belonging to the technical field of lithium-ion battery electrode materials and preparation thereof. In the process of synthesizing the transition metal composite hydroxide precursor, a reductive complexing agent is added: on the one hand, it uses its reducing property to prevent divalent manganese from being oxidized to a higher valence state to generate a heterophase; A flower-shaped hydroxide precursor composed of nanosheets is formed, and the crystallinity of the precursor is improved. The controllable synthesis of the precursor ensures the unique morphology and excellent electrochemical performance of the product after subsequent calcination and lithiation. The method of the invention has simple process, convenient operation and easy realization of large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials and their preparation, in particular to a high-magnification layered lithium-rich manganese-based cathode material Li 1.2 (Mn 0.54 Ni 0.13 co 0.13 )O 2 method of preparation. Background technique [0002] With the depletion of fossil fuel energy and the increasingly severe environmental pollution, electric vehicles have attracted more and more attention. The rapid development of electric vehicles has also put forward higher requirements for power lithium-ion batteries. Layered lithium-rich manganese-based cathode materials have higher specific capacity (> 200 mAh / g) and good safety performance than current general-purpose cathode materials, and have become the most promising anode materials for a new generation of power lithium-ion batteries. [0003] However, layered lithium-rich manganese-based cathode materials still have problems such as low rate performa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 杨文胜张斌陈彦彬刘大亮
Owner JIANGSU DANGSHENG MATERIAL TECH CO LTD