Meso-macroporous nano-fiber Li2FeSiO4 cathode active material

A positive active material and nanofiber technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of difficult to maintain close contact between particles, unfavorable power density, and impact on material tap density To achieve the effect of increasing the active interface of the electrochemical reaction, improving the kinetics of the electrode reaction, and improving the rate cycle performance

Inactive Publication Date: 2015-11-11
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Li 2 FeSiO 4 The electronic conductivity of lithium-ion battery cathode materials is low, and the modification methods include ion doping, carbon or polymer coating, and preparation of nanostructured electrodes, etc., but the loose distribution of nanoparticles and irregular carbon coating affect the material's conductivity. Tap density, in large-scale production, it is difficult to maintain a dense contact between particles, which is not conducive to improving power density

Method used

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Embodiment 1

[0032] A kind of mesoporous-macroporous nanofiber Li of the present invention 2 FeSiO 4 The preparation method of positive electrode active material, its specific steps are as follows:

[0033] Step 1, take by weighing 0.03g potassium persulfate respectively, be dissolved in the mixed solution of 100ml deionized water and 70ml ethanol, then drop 11ml styrene thereinto, react, generate polystyrene (PS) microsphere emulsion, And adopt gravity self-sedimentation method to assemble polystyrene (PS) colloidal crystal template;

[0034] Step 2, weigh 0.5g surfactant P 123 (EO 20 PO 70 EO 20 ), dissolved in 15mL ethanol to form the first solution; then weigh 2.088g ethyl orthosilicate, 0.02moL lithium nitrate and 0.01moL ferric nitrate and dissolve them in 10mL ethanol to form the second solution; add the second solution The first solution, under the condition of 40°C water bath, was stirred at a constant temperature to form Li 2 FeSiO 4 gel;

[0035] Step three, the Li 2 F...

Embodiment 2

[0037] A kind of mesoporous-macroporous nanofiber Li of the present invention 2 FeSiO 4 The preparation method of positive electrode active material, its specific steps are as follows:

[0038] Step 1, take 0.04g potassium persulfate respectively, dissolve it in the mixed solution of 100ml deionized water and 70ml ethanol, then add 11ml styrene dropwise to it, react, generate polystyrene microsphere emulsion, and adopt gravity Self-sedimentation method assembled into a colloidal crystal template;

[0039] Step 2, weigh 0.7g surfactant P 123 (EO 20 PO 70 EO 20 ), dissolved in 15mL ethanol to form the first solution; then weigh 2.088g ethyl orthosilicate, 0.02moL lithium nitrate and 0.01moL ferric nitrate and dissolve them in 10mL ethanol to form the second solution; add the second solution The first solution, under the condition of 40°C water bath, was stirred at a constant temperature to form Li 2 FeSiO 4 gel;

[0040] Step three, the Li 2 FeSiO 4 The gel was filled...

Embodiment 3

[0042]A kind of mesoporous-macroporous nanofiber Li of the present invention 2 FeSiO 4 The preparation method of positive electrode active material, its specific steps are as follows:

[0043] Step 1, take 0.05g potassium persulfate respectively, dissolve it in the mixed solution of 100ml deionized water and 70ml ethanol, then add 11ml styrene dropwise therein, react, generate polystyrene microsphere emulsion, and use gravity Self-sedimentation method assembled into a colloidal crystal template;

[0044] Step 2, weigh 0.8g surfactant P 123 (EO 20 PO 70 EO 20 ), dissolved in 15mL ethanol to form the first solution; then weigh 2.088g ethyl orthosilicate, 0.02moL lithium nitrate and 0.01moL ferric nitrate and dissolve them in 10mL ethanol to form the second solution; add the second solution The first solution, under the condition of 40°C water bath, was stirred at a constant temperature to form Li 2 FeSiO 4 gel;

[0045] Step three, the Li 2 FeSiO 4 The gel was filled ...

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Abstract

The invention discloses a nano-fiber macroporous Li2FeSiO4 lithium ion battery cathode active material, which is a three-dimensional ordered nano-fiber porous Li2FeSiO4 / C composite lithium ion battery cathode active material prepared from Li2FeSiO4 and amorphous carbon. A preparation method of the cathode active material comprises the following steps: (1) reacting to generate a polystyrene microsphere emulsion, and assembling a polystyrene colloidal crystal template by a gravitational self-sedimentation method; (2) dissolving a carbon material into a liquid solvent to form a first solution, sequentially weighing a silicon material, a lithium salt and a ferric salt again, additionally dissolving the silicon material, the lithium salt and the ferric salt into the liquid solvent to form a second solution, adding the second solution to the first solution, stirring the solution evenly at a constant temperature and evaporating the mixture at the constant temperature to form Li2FeSiO4 nano fiber gel; and (3) filling the polystyrene colloidal crystal template with the Li2FeSiO4 nano fiber gel under negative pressure, drying and solidifying the Li2FeSiO4 nano fiber gel at the room temperature, and finally carrying out thermal treatment to remove the polystyrene colloidal crystal template, thereby obtaining the nano-fiber macroporous Li2FeSiO4 lithium ion battery cathode active material.

Description

technical field [0001] The invention relates to the field of lithium ion battery preparation, in particular to a mesoporous-macroporous nanofiber Li 2 FeSiO 4 Positive electrode active material and preparation method thereof. Background technique [0002] Lithium-ion battery is a high-energy energy storage device, which has a wide range of applications in portable electronic products and new energy technologies. At present, many applications require lithium-ion batteries to have high specific capacity and excellent rate performance. The bottleneck restricting high-power lithium-ion battery technology is the cathode material. Therefore, the preparation of cathode materials suitable for lithium-ion power batteries is the focus of current research. [0003] Li 2 FeSiO 4 The electronic conductivity of lithium-ion battery cathode materials is low, and the modification methods include ion doping, carbon or polymer coating, and preparation of nanostructured electrodes, etc., b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 李东林雍红团华樊小勇苟蕾陈光琦毛一洋
Owner CHANGAN UNIV
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