Compound anode material for lithium ion battery and preparation method thereof

A composite cathode material, lithium ion battery technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of non-stoichiometric ratio defects, unfavorable battery cycle properties, small improvement, etc. Cyclic discharge capacity retention rate, the effect of avoiding direct contact

Inactive Publication Date: 2017-05-31
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although ion-doped modified positive electrode materials can achieve the effect of improving the electrochemical performance of the battery, the improvement is not large, and it is easy to cause non-stoichiometric defects, which is not conducive to the improvement of battery cycle properties, and the capacity of the battery is seriously attenuated.

Method used

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  • Compound anode material for lithium ion battery and preparation method thereof
  • Compound anode material for lithium ion battery and preparation method thereof
  • Compound anode material for lithium ion battery and preparation method thereof

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Embodiment Construction

[0028] The present invention will be described in further detail below in conjunction with specific embodiments and accompanying drawings.

[0029] (1) Dissolve nickel sulfate hexahydrate and manganese sulfate hexahydrate in 250ml deionized water according to the ratio of 1:3, stir to obtain the mixture;

[0030] (2) According to the molar ratio of urea to the total amount of nickel and manganese in the mixture, which is 2:1, add it to the mixture obtained in step (1). Heated for 12 hours, washed 3 times with deionized water and ethanol, and dried to obtain a precursor;

[0031] (3) Place the precursor obtained in step (2) in a muffle furnace, sinter at 500°C for 3 hours, and heat up at a rate of 5°C / min, and then naturally cool down to room temperature to obtain a precursor oxide;

[0032] (4) According to the molar ratio of excess lithium source of 5%, lithium hydroxide monohydrate is mixed with the precursor oxide obtained in step (3), placed in a muffle furnace, sintered ...

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Abstract

The invention belongs to the field of a lithium ion battery and specifically relates to a compound anode material for the lithium ion battery and a preparation method thereof. The material provided by the invention is prepared by a hydrothermal reaction method; Cr2O3 is coated on the outer layer of a LiNi0.5Mn1.5O4 anode material; the material has a shape of sphere with grain diameter of 15-20mu m; the morphology is uniform; the structure is stable; the component is controllable; the specific discharge capacity is high; the cycling stability and the capacity retention ratio are increased; the synthesizing method is simple and easy to operate; and the compound anode material can be used as a high-performance standby anode material of the power battery.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery composite cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices and new energy vehicles due to their high energy density, high output voltage, high safety and long service life. The preparation method of the positive electrode material in the lithium ion battery affects the structure, morphology and performance of the positive electrode material, and further affects the electrochemical properties of the lithium ion battery, such as the charge and discharge capacity and cycle stability of the battery. Improving the energy density, capacity retention and safety of lithium-ion batteries to meet the requirements of high-power batteries is a current research hotspot. [0003] The use of cathode materials with high charge cut-off voltage is an important...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/131H01M4/1391
CPCH01M4/131H01M4/1391H01M4/362Y02E60/10
Inventor 向勇井二宝刘雯
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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