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Core-shelled structured lithium ion battery positive composite material and its preparation method

A lithium-ion battery and composite material technology, applied in the field of lithium-ion battery positive electrode material preparation, can solve the problems of metal ions being far apart, reducing electron mobility, and being unsuitable for charging and discharging, achieving high specific capacity and energy density, and improving battery life. Effect of chemical properties, good cycle stability

Inactive Publication Date: 2015-02-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in Li 3 V 2 (PO 4 ) 3 Among them, due to the crystal structure, the metal ions are far apart, which reduces the mobility of electrons in the material to a certain extent, resulting in low electronic conductivity of the material, which is not suitable for charging and discharging under high current.

Method used

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  • Core-shelled structured lithium ion battery positive composite material and its preparation method
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Embodiment 1

[0032] A core-shell structure lithium ion battery cathode composite material, including LiFePO 4 Nano core and Li 3 V 2 (PO4) 3 Shell, Li 3 V 2 (PO4) 3 The shell is evenly coated in LiFePO 4 The periphery of the nano-nucleus, and Li 3 V 2 (PO4) 3 The outer periphery of the shell is also coated with amorphous carbon. The chemical formula of the core-shell structure lithium ion battery cathode composite material is xLiFePO 4 ·Li 3 V 2 (PO 4 ) 3 / C, where the value of x ranges from 3 to 9, and the mass percentage of amorphous carbon in the positive electrode composite material of the lithium ion battery is 3 to 15%.

[0033] XLiFePO with the above core-shell structure 4 ·Li 3 V 2 (PO 4 ) 3 / C lithium ion battery cathode composite material is prepared by the following preparation method:

[0034] (1) Weigh FeSO as the raw material according to the stoichiometric ratio of 8:1:11:6:27 4 ·7H 2 O, V 2 O 5 , NH 4 H 2 PO 4 , Li 2 CO 3 And H 2 C 2 O 4 ·2H 2 O. Weigh Ketjen superconducting carb...

Embodiment 2

[0040] A core-shell structure of xLiFePO 4 ·Li 3 V 2 (PO 4 ) 3 The preparation method of / C lithium ion battery cathode composite material includes the following steps:

[0041] (1) Weigh FeSO as the raw material according to the stoichiometric ratio of 8:1:11:6:27 4 ·7H 2 O, V 2 O 5 , NH 4 H 2 PO 4 , Li 2 CO 3 And H 2 C 2 O 4 ·2H 2 O. Weigh Ketjen superconducting carbon black at a mass ratio of 10% of the amorphous carbon in the cathode composite material of the lithium ion battery, mix the weighed raw materials into a closed container, and then add 300ml to the closed container. Ionized water, magnetically stirred at 70℃ for 2h to obtain a solid-liquid mixture;

[0042] Carry out ultrasonic dispersion treatment on the obtained solid-liquid mixture, the treatment time is 2h;

[0043] (2) Open the closed container or transfer the obtained solid-liquid mixture into an open container to continue heating and stirring for 12 hours to obtain a dry gel precursor mixture;

[0044] (3) Grind ...

Embodiment 3

[0048] A core-shell structure of xLiFePO 4 ·Li 3 V 2 (PO 4 ) 3 The preparation method of / C lithium ion battery cathode composite material includes the following steps:

[0049] (1) Weigh FeSO as the raw material according to the stoichiometric ratio of 8:1:11:6:27 4 ·7H 2 O, V 2 O 5 , NH 4 H 2 PO 4 , Li 2 CO 3 And H 2 C 2 O 4 ·2H 2 O. Weigh Ketjen superconducting carbon black at a mass ratio of 10% of the amorphous carbon in the cathode composite material of the lithium ion battery, mix the weighed raw materials into a closed container, and then add 300ml to the closed container. Ionized water, magnetically stirred at 70℃ for 2h to obtain a solid-liquid mixture;

[0050] Carry out ultrasonic dispersion treatment on the obtained solid-liquid mixture for a treatment time of 2 hours, then transfer it to a hydrothermal kettle and keep it at 200°C for 6 hours;

[0051] (2) Open the closed container or transfer the obtained solid-liquid mixture into an open container to continue heating a...

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Abstract

The invention discloses a core-shell structured lithium ion battery positive composite material and its preparation method. The composite material includes a LiFePO4 nanometer core and a Li3V2(PO4)3 shell, the Li3V2(PO4)3 shell is uniformly coated on the periphery of the LiFePO4 nanometer core, and the periphery of the Li3V2(PO4)3 shell is coated with amorphous carbon. The positive composite material has the advantages of high specific capacity, high energy density, good cycle stability, good rate performance and the like. The preparation method comprises the following steps: stirring an iron source compound, a vanadium source compound, a phosphorus source compound, a lithium source compound, a chelating agent and a carbon source in deionized water, and sintering the obtained mixture to obtain the composite material. The preparation method has the advantages of simple process, easy operation, low cost, environmental protection, and suitableness for large-scale and industrialized production.

Description

Technical field [0001] The invention relates to the technical field of preparation of lithium ion battery cathode materials, in particular to a core-shell structure xLiFePO 4 ·Li 3 V 2 (PO4) 3 / C lithium ion battery cathode composite material and its preparation method. Background technique [0002] With the rapid advancement of informatization and the rapid development of mobile Internet, people have higher and higher requirements for secondary chemical power sources. At present, the specific capacity and rapid charge-discharge performance of batteries have become the bottleneck for the continuous rapid development of mobile Internet devices. As the environment becomes more and more serious, and extreme weather such as haze, drought, and sandstorms continue to heat up, the electric vehicle and hybrid vehicle industries have received widespread attention. The development of high-power clean lithium-ion power secondary batteries is of strategic significance. [0003] As one of the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 梁叔全潘安强刘军陈涛曹鑫鑫
Owner CENT SOUTH UNIV
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