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Lithium silicate ferrous/graphene composite and its preparation method and application

A technology of lithium ferrosilicate and composite materials, applied in the field of electrochemical materials, can solve the problems of easy occurrence of impurities, poor rate performance, low electronic conductivity, etc., to solve the problem of low electronic conductivity and ionic conductivity, improve The effect of reversible capacity

Inactive Publication Date: 2014-06-11
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are many forms in silicate, in Li 2 FeSiO 4 Impurities are prone to appear during the synthesis of materials, and the synthesis of pure phase Li 2 FeSiO 4 tougher
At the same time Li 2 FeSiO 4 A similar problem exists: Li 2 FeSiO 4 It has a very low electronic conductivity and a small lithium ion diffusion coefficient, which makes the reversibility of lithium ion intercalation and deintercalation in the material poor, resulting in Li 2 FeSiO 4 Low discharge specific capacity and poor rate performance

Method used

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  • Lithium silicate ferrous/graphene composite and its preparation method and application
  • Lithium silicate ferrous/graphene composite and its preparation method and application

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preparation example Construction

[0018] The preparation method of above-mentioned iron ferrous silicate / graphene composite material, such as figure 1 shown, including the following steps:

[0019] S1. Put the iron source compound, lithium silicate and graphite oxide into a ball mill, and ball mill for 1-10 hours to obtain a mixed powder; wherein, the amount of the iron source compound and lithium silicate is based on the molar ratio of iron to silicon 1:1, the amount of graphite oxide added is 0.333~3 times the mass of lithium silicate;

[0020] S2. Put the mixed powder into a muffle furnace with a reducing atmosphere, and calcinate at 800-1000° C. for 6-24 hours to obtain a lithium ferrous silicate / graphene composite material.

[0021] In the above preparation method, in step S1, the source compound of iron may be one or more of iron oxide, ferrous oxide and ferric oxide.

[0022] In the above preparation method, in step S2, the gas in the reducing atmosphere is a mixed gas of hydrogen and argon or a mixed...

Embodiment 1

[0041] (1) Mix 72g of FeO, 90g of lithium silicate and 30g of graphite oxide into a ball mill and mill for 1 hour;

[0042] (2) Put the ball-milled mixture obtained in (1) into a muffle furnace protected by hydrogen-argon mixed gas containing 90% hydrogen, and calcinate at 800°C for 24 hours to obtain ferrous silicate containing 90% lithium ferrous silicate Lithium / graphene composites.

Embodiment 2

[0044] (1) Mix 80g of iron oxide, 90g of lithium silicate and 270g of graphite oxide into a ball mill and mill for 10 hours;

[0045] (2) Put the ball-milled mixture obtained in (1) into a muffle furnace protected by a hydrogen-argon mixture containing 90% hydrogen, and calcinate at 1000°C for 6 hours to obtain ferrous silicate containing 50% lithium ferrous silicate Lithium / graphene composites.

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Abstract

The invention belongs to the field of electrochemical materials, and discloses a lithium silicate ferrous / graphene composite and its preparation method and application; the composite consists of 50-90wt% of lithium silicate ferrous and 10-50wt% of graphene. According to the lithium silicate ferrous / graphene composite, the graphene is high in conductivity, and after compounding with the lithium silicate ferrous, the problem that the electronic and ionic conductivity of a lithium silicate ferrous material are not high can be solved effectively, and the reversible capacity is improved; at the same time, the composite discharge specific capacity can reach 145mAh / g which is close to the theoretical capacity of 166mAh / g; lithium ion batteries prepared by the composite can be charged and discharged at a current density of 5C, and the capacity retention rate can reach 62.8-80%.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a lithium ferrous silicate / graphene composite material and a preparation method and application thereof. Background technique [0002] With the development of various new energy sources, the miniaturization of portable electronic devices and the extensive demand for large-capacity and high-power chemical power sources for electric vehicles. At present, most commercial lithium-ion batteries use inorganic cathode / graphite systems, and these cathode materials are mainly lithium iron phosphate, lithium manganese oxide, lithium cobalt oxide, lithium nickel oxide and mixed systems. Although this type of system has excellent electrochemical performance, it has many disadvantages such as low capacity (such as the theoretical 170mAh / g of lithium iron phosphate), complex preparation process, and high cost. Therefore, the development of new and other types of cathode materials has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/136H01M10/0525
CPCY02E60/122H01M4/136H01M4/58H01M4/625H01M10/0525Y02E60/10
Inventor 周明杰钟玲珑王要兵
Owner OCEANS KING LIGHTING SCI&TECH CO LTD