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A kind of lithium ion battery cathode material and preparation method thereof

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reduced capacity of the discharge platform, large irreversible capacity loss, poor cycle stability, etc., to achieve the mitigation of energy density loss, excellent Effect of rate capability and stable cycle capability

Active Publication Date: 2016-05-18
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, lithium-rich manganese-based ternary materials still have the following disadvantages: (1) large initial irreversible capacity loss and low Coulombic efficiency; (2) oxygen evolution during cycling, leading to safety issues; (3) due to Li 2 MnO 3 The conductivity of the components is low, resulting in poor rate performance; (4) there is a spinel phase transition during the cycle, resulting in a decrease in the discharge platform and loss of capacity, and poor cycle stability

Method used

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  • A kind of lithium ion battery cathode material and preparation method thereof
  • A kind of lithium ion battery cathode material and preparation method thereof
  • A kind of lithium ion battery cathode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Using potassium permanganate, manganese sulfate, and concentrated sulfuric acid as starting materials, dissolve 0.474g of potassium permanganate, 0.845g of manganese sulfate, and 1mL of concentrated sulfuric acid in 15mL of deionized water, stir for 10min to form a homogeneous solution, and transfer it to In the reaction kettle, heat up to 150°C and keep it for 20 minutes. After cooling down, filter with suction, wash with deionized water for 3 times, and then dry to obtain a potassium-doped manganese precursor; mix 0.55g of the obtained precursor with 0.4430g of nickel nitrate, 0.4440g of cobalt nitrate After fully grinding and mixing with 0.5909g lithium hydroxide, put it into a crucible; heat up to 900°C in a box furnace at a heating rate of 2°C / min and heat for 12h, and cool at room temperature to obtain x=0.62 Cathode material Li (3+x) / 3-y K y mn (1+x) / 3 co (1-x) / 3 Ni (1-x) / 3 o 2 , where y=(1+x) / 162, recorded as sample 1#.

[0045] The XRD test results of sam...

Embodiment 2

[0049] Using potassium permanganate, manganese sulfate, and concentrated sulfuric acid as starting materials, dissolve 0.474g of potassium permanganate, 0.845g of manganese sulfate, and 1mL of concentrated sulfuric acid in 15mL of deionized water, stir for 10min to form a homogeneous solution, and transfer it to In the reaction kettle, the temperature was raised to 160°C and kept for 30 minutes. After cooling down, it was filtered with suction, washed with deionized water for 3 times, and then dried to obtain a potassium-doped manganese precursor; After fully grinding and mixing with 0.6690g lithium hydroxide, put it into a crucible; heat up to 850°C in a box furnace at a heating rate of 2°C / min and heat for 12h, and cool in ice water to obtain x=0.3 Cathode material Li (3+x) / 3-y K y mn (1+x) / 3 co (1-x) / 3 Ni (1-x) / 3 o 2 , where y=(1+x) / 162, recorded as sample 2#.

[0050] The XRD test results of sample 2# show that its XRD diffraction peak position is the same as that of...

Embodiment 3

[0054] Using potassium permanganate, manganese sulfate, and concentrated sulfuric acid as starting materials, dissolve 0.474g of potassium permanganate, 0.845g of manganese sulfate, and 1mL of concentrated sulfuric acid in 15mL of deionized water, stir for 10min to form a homogeneous solution, and transfer it to In the reaction kettle, the temperature was raised to 150°C for 20 minutes, the temperature was lowered, and then suction filtered, washed with deionized water for 3 times, and then dried to obtain a potassium-doped manganese precursor; 1.0 g of the obtained precursor was mixed with 0.1744 g of nickel nitrate, 0.1745 g of cobalt nitrate After fully grinding and mixing with 0.9820g lithium hydroxide, put it into a crucible; heat up to 950°C in a box furnace at a heating rate of 2°C / min for 12 hours, and cool in liquid nitrogen to obtain x=0.9 The cathode material Li (3+x) / 3-y K y mn (1+x) / 3 co (1-x) / 3 Ni (1-x) / 3 o 2 , where y=(1+x) / 162, recorded as sample 3#.

[0...

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Abstract

The invention discloses a potassium-doped rich-lithium manganese-based oxide positive electrode material and a preparation method of the positive electrode material. The chemical formula of the positive electrode material can be expressed as Li<(3+x) / 3-y>K<y>Mn<(1+x) / 3>Co<(1-x) / 3>Ni<(1-x) / 3>O2, wherein x is greater than or equal to 0.3, and less than or equal to 0.9, and y is equal to (1+x) / 162. The positive electrode material has extremely high energy density and excellent cycle performance and rate performance. An in-situ potassium-doped manganese precursor is taken as a manganese source for preparing the positive electrode material; the adopted preparation method has the advantages of simple operation, low production cost, short synthesis period, high repeatability and the like, and can be widely applied to the synthesis of the oxide positive electrode materials for the lithium ion batteries.

Description

technical field [0001] The present application relates to an in-situ potassium-doped lithium-rich manganese-based oxide cathode material in the field of lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-rich manganese-based ternary cathode materials have attracted extensive attention due to their extremely high discharge specific capacity, and have broad application prospects in the fields of power electric vehicles and portable electronic devices. However, lithium-rich manganese-based ternary materials still have the following disadvantages: (1) large initial irreversible capacity loss and low Coulombic efficiency; (2) oxygen evolution during cycling, leading to safety issues; (3) due to Li 2 MnO 3 The low conductivity of the components leads to poor rate performance; (4) there is a spinel phase transition during the cycle, which leads to the reduction of the discharge platform and capacity loss, and poor cycle stability. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李莉萍李琪付超超李广社
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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