A kind of positive electrode material of lithium ion battery and preparation method thereof

A lithium-ion battery and positive electrode material technology, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve the problems affecting the final shape of the material, high cost, etc., and achieve the benefits of ion transmission, fewer influencing factors, and improved performance Effect

Inactive Publication Date: 2020-12-01
XIANYANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current synthesis methods (template method, vapor deposition method, self-organization method, electrospinning method, hydrothermal method, etc.) still have high costs, and there are many factors in the synthesis process that will affect the final morphology of the material. , making it difficult to apply in actual production

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of Li 2 MnSiO 4 The preparation method of / C cathode material specifically comprises the following steps:

[0042] S1, add 0.038mol of oleic acid into 50ml of ethanol solution, stir magnetically at 50°C to form a uniform transparent solution, then add 0.019mol of lithium hydroxide monohydrate, continue magnetic stirring until lithium hydroxide monohydrate is completely dissolved and A white mixed solution is formed, which is the first solution;

[0043] S2, dissolving 0.01mol manganese acetate tetrahydrate and 0.01mol ethyl orthosilicate in ethanol to form a second solution;

[0044] S3, adding the second solution to the first solution, and stirring at 50° C. for 2 hours to obtain a mixed gel;

[0045]S4, put the mixed gel in an oven at 50°C for 10 hours and grind it into a 100-mesh powder; place the fine powder in a tube furnace with an argon atmosphere, and raise the temperature from 20°C to After pre-calcining at 300°C for 5 hours, then heating up to 900°C...

Embodiment 2

[0047] A kind of Li 2 MnSiO 4 The preparation method of / C cathode material specifically comprises the following steps:

[0048] S1, add 0.032mol of oleic acid into 50ml of ethylene glycol solution, stir magnetically at 60°C to form a uniform transparent solution, then add 0.01mol of lithium oxalate, continue magnetic stirring until the lithium oxalate is completely dissolved and a white mixed solution is formed , which is the first solution;

[0049] S2, dissolving 0.01mol manganese oxalate and 0.01mol methyl orthosilicate in ethylene glycol to form a second solution;

[0050] S3, adding the second solution to the first solution, stirring at 60° C. for 1.5 h to obtain a mixed gel;

[0051] S4, the mixed gel was dried in an oven at 60°C for 9 hours and then ground into powder; the powder was placed in a tube furnace with an argon atmosphere, and the temperature was raised from 20°C to 400°C at a heating rate of 5°C / min. After firing for 3 hours, the temperature was raised ...

Embodiment 3

[0053] A kind of Li 2 MnSiO 4 The preparation method of / C cathode material specifically comprises the following steps:

[0054] S1, add 0.0168mol of oleic acid into 50ml of acetone solution, magnetically stir at 70°C to form a uniform transparent solution, then add 0.007mol of lithium citrate, continue magnetically stirring until the lithium citrate is completely dissolved and a white mixed solution is formed, is the first solution;

[0055] S2, dissolving 0.01mol of manganese nitrate and 0.01mmol of propyl orthosilicate in acetone to form a second solution;

[0056] S3, adding the second solution to the first solution, and stirring at 70° C. for 1.5 h to obtain a mixed gel;

[0057] S4, the mixed gel was dried in an oven at 100°C for 1 hour and then ground into powder; the powder was placed in a tube furnace with an argon atmosphere, and the temperature was raised from 20°C to 500°C at a heating rate of 5°C / min After pre-calcining for 2 hours, heat up to 700°C at a heati...

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Abstract

The invention discloses a lithium ion battery anode material and a manufacturing method thereof. The method comprises the following steps of adding an oleic acid to an organic solvent A, adding a lithium source after mixing, and dissolving to obtain a first solution; dissolving a silicic acid source and a compound containing M in an organic solvent B to obtain a second solution; mixing the first solution and the second solution and then heating to obtain a mixed gel; and drying the mixed gel and grinding, and carrying out heat treatment in an inert atmosphere to obtain the lithium ion batteryanode material. A manufactured Li2MSiO4 / C composite nanomaterial is used as the lithium ion battery anode material, which effectively achieves high capacity charge and discharge and high cycle stability of the battery. When M is manganese, a capacity retention ratio can reach 49.4%, and when the M is iron, a cycle retention rate can reach 94.35%.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high operating voltage, no memory effect, small self-discharge, and wide operating temperature range, but there are certain problems in battery safety, cycle life and cost. The performance of cathode materials is the key factor determining the performance of lithium-ion batteries. Therefore, improving the performance of cathode materials and developing new cathode materials have always been an important direction in the research field of lithium-ion batteries. In recent years, lithium orthosilicate composite materials Li 2 MSiO 4 has received extensive attention, compared to the layered material Li 2 CoO 2 , spinel-like material LiMn 2 o 4 and olivine-like material LiMPO 4 and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 刘建波尚永辉
Owner XIANYANG NORMAL UNIV
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