A positive electrode material for lithium secondary cell, and preparation and usage thereof

A lithium secondary battery and positive electrode material technology, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problem that the specific capacity and charge-discharge cycle of positive electrode materials are not very ideal, and cannot meet the needs of large capacity or high power density lithium secondary batteries. Battery and other issues

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

AI Technical Summary

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 Lithium secondary battery cathode material with high rate charge and discharge performance, good cycle performance and safety performance

Method used

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  • A positive electrode material for lithium secondary cell, and preparation and usage thereof
  • A positive electrode material for lithium secondary cell, and preparation and usage thereof
  • A positive electrode material for lithium secondary cell, and preparation and usage thereof

Examples

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Embodiment 1

[0078] Embodiment 1, according to the preparation method of the present invention-preparation process LiAlO 2 Modified spinel LiMn 2 o 4 Lithium-ion battery active cathode material

[0079] Mix 2mol / l manganese sulfate aqueous solution and 4mol / l sodium hydroxide aqueous solution and 2.0mol / l H 2 o 2 Added to the reactor at the same time, the manganese sulfate and H 2 o 2 The molar ratio is 1:1, the PH=12 is controlled by controlling the amount of sodium hydroxide added, the reaction temperature is 50°C, stirred for 5 hours, then filtered, washed, and dried in an oven at 120°C to obtain the Mn-containing oxide compound and hydroxide mixture.

[0080] Add 50 grams of manganese oxide or hydroxide precursor prepared by the chemical precipitation technology into the aluminum nitrate solution with a concentration of 1 mol / l, wherein the molar ratio of aluminum nitrate to manganese-containing precursor is 0.1:1. while stirring

[0081] Gradually add 4 mol / l ammonia water unt...

Embodiment 2～21

[0085] Embodiment 2~21, according to the preparation method of the present invention one is synthesized under different conditions a series of positive spinel structure lithium manganese oxide LiMn 2-z m z o 4 positive active material

[0086] According to the preparation method one provided by the present invention, under the different conditions listed in Table 1, a series of positive spinel structure lithium manganese oxides LiMn were synthesized. 2-z m z o 4 Positive active material.

[0087]

Embodiment 22

[0088] Example 22, LiAlO was prepared according to the second preparation method of the present invention 2 Modified spinel LiMn 2 o 4 Lithium-ion battery active cathode material

[0089] Mix 3mol / l manganese sulfate aqueous solution and 6mol / l sodium hydroxide aqueous solution and 1.5mol / l H 2 o 2 Added to the reactor at the same time, the manganese sulfate and H 2 o 2 The molar ratio is 1:1, the PH=11 is controlled by controlling the amount of sodium hydroxide added, the reaction temperature is 60°C, and stirring is carried out for 10 hours, then filtered, washed, and dried in an oven at 120°C to obtain Mn-containing oxidized compound and hydroxide mixture. The prepared manganese oxide or hydroxide precursor was directly mixed with LiOH.H 2 O is mixed according to a molar ratio of 2:1.05, 50% of water is added, mixed thoroughly, and then spray-dried, and the spray-dried powder is sintered at 800°C for 24 hours to synthesize LiMn with a spinel structure. 2 o 4 Materi...

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Abstract

The invention relates to 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 LiMn2-zMzO4 (0<=z<=0.5.), M is chosen from Li, Mg, Co, Ni, Fe, Al, Sr, Cr, Ga, Cu and Zn. The manufacturing method for positive electrode material of the lithium 1 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 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 lithium secondary battery cathode material with a positive spinel structure and its preparation and use. 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 for the production and promotion of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02H01M4/04H01M4/131H01M4/1391H01M4/505
CPCY02E60/122C01P2002/72C01G51/54C01G45/1242C01G53/54C01G49/009H01M4/1391C01P2006/40C01P2002/52H01M4/505Y02E60/10
Inventor 孙玉城陈立泉黄学杰
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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