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Positive electrode active material and preparation method thereof as well as lithium ion battery

A technology of positive electrode active materials and composite materials, which is applied in the field of positive electrode active materials and their preparation and lithium-ion batteries, and can solve problems such as low conductivity

Active Publication Date: 2018-01-09
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Li 2 MoO 3 The theoretical capacity is 339mAh / g, but in fact its charge and discharge capacity is only about 200mAh / g, which is due to Li 2 MoO 3 due to the low conductivity of the

Method used

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  • Positive electrode active material and preparation method thereof as well as lithium ion battery
  • Positive electrode active material and preparation method thereof as well as lithium ion battery

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preparation example Construction

[0018] The present invention also provides a method for preparing the positive electrode active material as described above, the steps comprising:

[0019] S1. Will Li 2 MoO 4 , molybdenum oxide and carbon source mixed;

[0020] S2, high temperature sintering and cooling in reducing atmosphere to prepare Li 2 MoO 3 and molybdenum carbide.

[0021] Carbon source and molybdenum oxide in Li 2 MoO 3 The particle surface reacts, so the Mo 2 C formed on Li 2 MoO 3 on the surface of the particles, forming Mo 2 C and Li 2 MoO 3 Particles in close contact, forming a complete or partial coating. At the same time Mo 2 C can also block adjacent Li 2 MoO 3 particles, preventing Li 2 MoO 3 The particle grows up, which is conducive to the deintercalation of lithium ions. In the synthesis of Li 2 MoO 3 Molybdenum carbide (Mo 2 C), which can make the mixing of materials more uniform, make the contact of materials closer, and effectively reduce Li 2 MoO 3 The particle size...

Embodiment 1

[0033] Will Li 2 MoO 4 , molybdenum trioxide and glucose were mixed according to the mass ratio of 100:1.3:0.27, and placed in a stirring ball mill for mixing and grinding for 8 hours; the precursor prepared by fully mixing and grinding was placed in a corundum crucible; the crucible was put into a tube furnace, and the Into 10%H 2 / Ar mixed gas, heating from room temperature at a heating rate of 5 °C / min, heating up to 600 °C for 10 h, then raising the temperature to 850 °C for 20 h, and then naturally cooling to room temperature to obtain Mo 2 Li with a C content of 1 wt% 2 MoO 3 / Mo 2 C composite, labeled S1. The average particle size of the prepared S1 is 5 μm.

Embodiment 2

[0035] Will Li 2 MoO 4 , molybdenum dioxide, and glucose were mixed according to a mass ratio of 100:2.3:0.55, placed in a stirring ball mill, added ethanol, and wet mixed and ground for 6 hours; the precursor prepared by fully mixing and grinding was dried and placed in a corundum crucible; The crucible was placed in a tube furnace and fed with 10% H 2 / Ar mixed gas, heating from room temperature at a heating rate of 5°C / min, raising the temperature to 650°C for 10 hours, then raising the temperature to 900°C for 10 hours, and then naturally cooling to room temperature to obtain Mo 2 Li with a C content of 2wt% 2 MoO 3 / Mo 2 C composite, labeled S2. The average particle size of the prepared S2 is 4 μm.

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Abstract

The invention relates to a positive electrode active material, comprising a composite material of Li2MoO3 and molybdenum carbide. The invention also provides a preparation method of the positive electrode active material and a lithium ion battery. The lithium ion battery prepared by the invention is good in electrical conductivity and high in charge and discharge capacity.

Description

technical field [0001] The invention relates to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] It has been less than 20 years since the birth of lithium-ion batteries, and its application field has rapidly expanded from the initial mobile communication to various portable electronic products involving people's life and entertainment, military, aerospace, medical treatment, communication, etc. It is developing into large and medium-sized energy storage equipment and power supply. The great commercial success of lithium-ion batteries and the promotion of the development of the above fields are unmatched by any secondary battery. [0003] At present, the most researched and used lithium-ion battery cathode materials are mainly lithium transition metal oxides, including hexagonal layered structure materials (typically such as LiCoO 2 、LiNi 0.5 mn 0.5 o 2 and LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ), LiMn with sp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/62H01M10/0525
CPCY02E60/10
Inventor 焦晓朋张百爽李世彩
Owner SHANGHAI BYD
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