Preparation method of LiFePO4 positive electrode material and lithium ion battery
A lithium-ion battery and positive electrode material technology, applied in the field of energy batteries, can solve the problems of low conductivity, low tap density, and limited electrochemical performance of materials, and achieve the effect of improving conductivity and conductivity
Inactive Publication Date: 2015-07-01
ZHANGJIAGANG SHANMU NEW MATERIAL TECH DEV
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Problems solved by technology
However, LiFePO 4 Low electrical conductivity, low tap density and slow diffusion of lithium ions make it difficult to obtain full capacity, thus limiting the electrochemical performance of the material
Method used
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Embodiment Construction
[0012] The present invention is further illustrated by the following examples: According to the following examples, the present invention can be better understood. However, those skilled in the art can easily understand that the specific material ratios, process conditions and results described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in the claims.
[0013] The preparation method of lithium ion battery comprises:
[0014] (1), LiFePO 4 The preparation of positive electrode materials includes: mixing iron oxide, lithium dihydrogen phosphate and glucose according to the mass ratio of 6:12:5, in acetone at a speed of 150r / min, ball milling for 10h, and then drying in air at 100°C 4h, get the precursor, press the precursor into a tablet, pre-calcine at 350°C for 4h, grind, press into a tablet, calcine at a constant temperature at 800°C for 20h under the protection of an argon inert atmosp...
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The invention discloses a preparation method of a LiFePO4 positive electrode material and a lithium ion battery. The preparation method of the LiFePO4 positive electrode material comprises the steps of mixing iron oxide, lithium dihydrogen phosphate and glucose in a mass ratio of 6 to 12 to 5, carrying out ball milling at a rotation speed of 150r / min for 10 hours in acetone, drying the mixture at 100 DEG C in air for 4 hours to obtain a precursor, pressing the precursor into a piece, pre-roasting at 350 DEG C for 4 hours, grinding, carrying out tabletting, carrying out constant-temperature calcining at 800 DEG C for 20 hours under the protection of an inert atmosphere of argon, and naturally cooling so as to obtain the LiFePO4 positive electrode material. The LiFePO4 positive electrode material has relatively small and uniform particles and a relatively good olivine-shaped structure, and the surfaces of the particles are coated with activated carbon layers, so that the electric conductivity of the LiFePO4 positive electrode material is improved; amorphous carbon is located among the particles, so that the conductivity of the LiFePO4 positive electrode material is improved. According to the battery prepared from the LiFePO4 positive electrode material, the primary specific discharge capacity is 160.2mAh / g, and the capacity is maintained at 157.1mAh / g after 50 cycles.
Description
technical field [0001] The application belongs to the technical field of energy batteries, in particular to a LiFePO 4 A preparation method of a positive electrode material, and a lithium ion battery. Background technique [0002] Compared with other cathode materials, olivine-type LiFePO 4 The cathode material has the advantages of low cost, good safety performance, environmental friendliness, non-toxicity, high specific capacity and good cycle performance, etc., and has become the most promising anode material for a new generation of lithium-ion batteries. [0003] Currently, LiFePO 4 There are many commercial applications, such as high-rate applications such as electric vehicles and hybrid vehicles. However, LiFePO 4 The low electrical conductivity, low tap density, and slow lithium ion diffusion rate make it difficult to obtain full capacity, thereby limiting the electrochemical performance of the material. Contents of the invention [0004] The object of the pres...
Claims
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IPC IPC(8): H01M4/58H01M4/62C01B25/45H01M10/0525H01M10/058
CPCC01B25/45H01M4/5825H01M4/62H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 范佳晨赵维达赵云龙
Owner ZHANGJIAGANG SHANMU NEW MATERIAL TECH DEV