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Cathode material of lithium ion battery, and preparation method thereof and lithium ion battery

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of small specific surface area and poor filling performance of lithium manganese oxide materials, and achieve good high temperature cycle performance and filling performance.

Active Publication Date: 2012-11-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific surface area of ​​the lithium manganese oxide material obtained by this method is small, and the high temperature cycle performance is improved, but its filling performance is poor.

Method used

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  • Cathode material of lithium ion battery, and preparation method thereof and lithium ion battery
  • Cathode material of lithium ion battery, and preparation method thereof and lithium ion battery
  • Cathode material of lithium ion battery, and preparation method thereof and lithium ion battery

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preparation example Construction

[0064] The present invention also provides a kind of preparation method of lithium-ion battery cathode material, comprises the following steps:

[0065] a) mixing the manganese-containing compound with a solvent to obtain a manganese-containing compound solution;

[0066] b) adding a precipitating agent to the manganese-containing compound solution obtained in step a) to obtain a precipitate, the precipitating agent being an alkali metal hydroxide solution, an alkali metal carbonate solution or an alkali metal bicarbonate solution;

[0067] c) roasting the precipitate obtained in step b) to obtain a positive electrode material precursor;

[0068] d) mixing the positive electrode material precursor, MnS and lithium-containing compound obtained in step c), roasting, and grinding to obtain a solid powder;

[0069] e) performing annealing treatment on the solid powder obtained in the step d) to obtain a positive electrode material for a lithium ion battery.

[0070] The inventi...

Embodiment 1～10

[0104] According to the raw materials, dosage and conditions shown in Table 1, the lithium manganese oxide material precursor was prepared according to the following steps:

[0105] Add a displacing agent to the manganese compound-containing solution, slowly add a precipitating agent dropwise under stirring conditions, adjust the pH value of the resulting mixed solution, and obtain a mixed precipitate after filtering; dry the mixed precipitate in a vacuum at 80°C 8h, the dried mixed precipitate was calcined in a tube furnace with an oxygen flow rate of 2mL / min to obtain a precursor of lithium manganese oxide material.

[0106] Table 1 The formula and conditions for preparing the precursor of lithium manganese oxide material in Examples 1-10 of the present invention

[0107]

[0108] According to the raw materials, dosage and conditions shown in Table 2, the lithium manganese oxide material was prepared according to the following steps:

[0109] Put the precursor of the lit...

Embodiment 11

[0133] 8g of the lithium manganese oxide material prepared in Example 1, 1g of acetylene black, 1g of polyvinylidene fluoride and 30g of N-methylpyrrolidone were mixed at normal temperature and pressure to form a slurry, which was uniformly coated on the surface of aluminum foil to obtain a pole piece; The pole pieces were dried at 80°C and pressed tightly, and cut into an area of ​​1.32cm 2 The circular sheet is used as the positive electrode, the pure lithium sheet is used as the negative electrode, and 1mol / L LiPF 6 A solution of ethylene carbonate (EC) and dimethyl carbonate (DMC) was used as the electrolyte, wherein the volume ratio of EC and DMC was 1:1, and a lithium-ion battery was assembled in an argon-filled glove box.

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Abstract

The invention provides a cathode material of a lithium ion battery. The cathode material is composed by the atomic ratio shown in formula (I): Lia(MxMn2-x)(O4-yZy), wherein a is greater than or equal to 0.8 and less than or equal to 1.2; x is greater than or equal to 0 and less than or equal to 1; y is greater than or equal to 0 and less than or equal to 1; M is one or more selected from Li, Na, K, Ca, Mg, Al, Ti, Sc, Ge, V, Cr, Zr, Co, Ni, Zn, Cu, La, Ce, Mn, Hf, Nb, Ta, Mo, W, Ru, Ag, Sn, Pb and Si; and Z is one or more selected from OH, halogens, N, P, S and O. Primary particles of the cathode material have sphere-like morphologies, wherein (111) face is connected with adjacent equivalent crystal face through a curved surface having no clear edges. The invention also provides a preparation method for the cathode material of the lithium ion battery and the lithium ion battery. The cathode material provided by the invention has good high-temperature cycling performance and good filling property.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion battery is a rechargeable battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to achieve charging and discharging. Lithium-ion batteries have the advantages of good safety, high voltage and specific energy, and long charge and discharge life, so they are widely used in portable appliances such as mobile phones, notebook computers, and cameras. [0003] The positive electrode material is the core part of the lithium ion battery. The prior art discloses a variety of lithium ion battery positive electrode materials, such as lithium cobalt oxygen, lithium iron phosphate, lithium manganese oxygen, etc., wherein lithium cobalt oxygen has high capacity, high voltage, easy P...

Claims

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Application Information

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IPC IPC(8): H01M4/131H01M4/1391H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 夏永高刘兆平赛喜雅勒图
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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