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Positive electrode material of manganese series, and preparation and usage thereof

A technology of positive electrode material and negative electrode active material, which is applied in the field of battery positive electrode material and can solve the problems of inability to meet large capacity or high power density lithium secondary batteries, and the specific capacity and charge-discharge cycle performance of positive electrode materials are not ideal.

Inactive Publication Date: 2005-03-16
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the existing technology can not meet the requirements of producing large capacity or high power density lithium secondary battery, the actual specific capacity and charge-discharge cycle of the existing positive electrode material is not very ideal defects, thereby providing a kind of Manganese-based cathode materials for lithium secondary batteries with high-rate charge-discharge performance, good cycle performance and safety performance

Method used

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  • Positive electrode material of manganese series, and preparation and usage thereof
  • Positive electrode material of manganese series, and preparation and usage thereof
  • Positive electrode material of manganese series, and preparation and usage thereof

Examples

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Embodiment 1

[0067] Embodiment 1, according to the preparation method of the present invention-preparation through Al 2 o 3 Modified LiMn 0.5 Ni 0.5 o 2 Manganese-based cathode materials for lithium-ion batteries

[0068] Mix nickel sulfate and manganese sulfate at a molar ratio of 1:1 to make a 2mol / l aqueous solution, then dissolve sodium hydroxide in water to make a 4mol / l solution. Add transition metal sulfate, sodium hydroxide, 25% ammonia water and hydrazine hydrate solution into the reaction kettle at the same time, control the temperature of the slurry in the reaction kettle to 50° C., pH=10, and stir for 5 hours. Then filter, wash the precipitate, and dry it.

[0069] Add 50 grams of nickel and manganese hydroxide precursors prepared by the liquid-phase precipitation technology into 2mol / l aluminum nitrate solution, wherein the molar ratio of aluminum nitrate and manganese-containing precursors is 0.1:1, and then stir At the same time, 8.0M ammonia water was added dropwise u...

Embodiment 2～21

[0072] Embodiment 2~21, according to the preparation method of the present invention-synthesize a series of layered lithium manganese oxides LiMn under different conditions 1-x-y Ni x m y o 2 positive active material

[0073] According to the preparation method one provided by the present invention, under the different conditions listed in Table 1, a series of layered lithium manganese oxides LiMn were synthesized. 1-x-y Ni x m y o 2 Positive active material.

[0074]

Embodiment 22

[0075] Example 22, according to the preparation method of the present invention two synthesis process LiAlO 2 Modified LiMn 0.4 Ni 0.4 co 0.2 o 2 Lithium-ion battery cathode active material

[0076] Mix nickel sulfate, manganese sulfate and cobalt sulfate according to the molar ratio of 2:2:1 to make a 2mol / l aqueous solution, then dissolve sodium hydroxide in water to make a 8mol / l solution. Add transition metal sulfate, sodium hydroxide, 25% ammonia water and hydrazine hydrate solution into the reaction kettle at the same time, control the temperature of the slurry in the reaction kettle to 80° C., pH=13, and stir for 5 hours. Then filter, wash the precipitate, and dry it.

[0077] Mix the oxide or hydroxide precursor of nickel and manganese prepared above directly with lithium hydroxide at a molar ratio of 1:1.05, add water to adjust the viscosity of the slurry, spray dry and granulate, and the particle size after drying is 20 Micron solid powder particles were sinter...

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Abstract

The invention relates to manganese department positive electrode material of a lithium secondary battery, which can combine with electrolyte solution or solid electrolyte, and negative electrode active material to form lithium secondary battery. Its characteristics are: the positive electrode material of lithium secondary battery is LiMn1-x-y NixMyO2(x is not less than 0.2 and not larger than 0.8, y is not less than 0 and not larger than 0.6, and x+y is not larger than 1.), M is chosen from Li, Mg, Co, Ni, Fe, Al, Cr. The manufacturing method for manganese department positive electrode material of the lithium secondary battery, includes preparation of usher containing Mn; decorate to the covering of usher particle containing Mn; mix with lithium salt and prepare particle; sintering and other steps. By decoration of the surface of particle to usher 6 of positive electrode containing Mn or active material itself, state of material or apparent condition of material can be changed and its capacity of powerful charge and discharge, cycle performance and thermal stability can be raised. The invention has notable advantages including low cost, capacity of powerful charge and discharge, super-long cycle performance, excellent safety, super-long circulation property and resistance to overcharge .

Description

technical field [0001] The invention relates to a battery cathode material, in particular to a manganese-based cathode material for a secondary lithium battery. technical background [0002] At present, the positive electrode active material used in commercial lithium-ion batteries is mainly LiCoO with layered structure. 2 and LiMn with spinel structure 2 o 4 . where LiCoO 2 The theoretical specific capacity is 275 mAh / g, and the actual specific capacity is in the range of 130-150 mAh / g. It is the earliest positive electrode active material used in commercial lithium-ion batteries. Due to its stable performance and easy synthesis, it is still widely used in commercial lithium-ion batteries. However, due to the poor resources and high price of Co, LiCoO 2 It is difficult to reduce the production cost of lithium-ion batteries as cathode materials, which will become an important restrictive factor in the production and promotion of large-capacity lithium-ion batteries. L...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01G45/02H01M4/02H01M4/04H01M4/48H01M4/50H01M4/52H01M10/36
CPCY02E60/122H01M4/525H01M10/0525H01M4/131H01M4/505Y02E60/10
Inventor 孙玉城陈立泉黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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