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Stable laminated structure positive electrode material of lithium ion battery and its preparing method

A technology for lithium-ion batteries and cathode materials, applied in electrode manufacturing, battery electrodes, structural parts, etc., can solve problems such as increased production costs, large energy consumption, and fluctuations in the phase composition of precursors

Inactive Publication Date: 2007-04-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are obvious defects in these processes. First, the capacity of the material is reported in the literature ranging from 130-200mAh / g. The reason is traced back, and one of the important points is that Ni(OH) 2 and Mn(OH) 2 Different supersaturations lead to poor repeatability of the co-precipitation process in the hydroxide system, resulting in fluctuations in the phase composition of the precursor, and the performance of the product is very different; second, the Mn in the hydroxide 2+ It is quickly oxidized in the air, resulting in the appearance of manganese oxide impurities with different valence states in the final product, which greatly affects the electrochemical performance of the material; Large energy consumption; liquid nitrogen quenching technology greatly improves the preparation cost
In summary, the existing Li[Ni X Li 1 / 3-2X / 3 mn 2 / 3-X / 3 ]O 2 The preparation process of the material severely limits the industrial production and practical application of the material, so there is an urgent need for a preparation method with good repeatability, simple process, and low cost to promote this material with application prospects and market potential to be put into production as soon as possible

Method used

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  • Stable laminated structure positive electrode material of lithium ion battery and its preparing method
  • Stable laminated structure positive electrode material of lithium ion battery and its preparing method
  • Stable laminated structure positive electrode material of lithium ion battery and its preparing method

Examples

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Effect test

Embodiment 1

[0020] (1) Weigh Ni(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2 ·6H 2 O, dissolved in distilled water to form a mixed nitric acid solution;

[0021] (2) with Na 2 CO 3 As a precipitating agent, control pH=9.5 to obtain NiCO 3 and MnCO 3 Co-precipitate;

[0022] (3) The precipitate is pretreated at 600°C;

[0023] (4) The pretreated powder and Li 2 CO 3 Mix according to Li:(Ni+Mn) molar ratio 7:5;

[0024] (5) The uniformly mixed powder is kept at 900°C for 12 hours in an air atmosphere, then the furnace power is turned off, and the furnace is lowered to room temperature to obtain Li[Ni 1 / 4 Li 1 / 6 mn 7 / 12 ]O 2 (Li[Ni X Li 1 / 3-2X / 3 mn 2 / 3-X / 3 ]O 2 (X=1 / 4) powder.

example 2

[0026](1) Weigh NiSO with a molar ratio of 15:19 4 ·6H 2 O and MnSO 4 ·H 2 O, dissolved in distilled water to form a mixed sulfuric acid solution;

[0027] (2) with Li 2 CO 3 As a precipitant, control pH=8 to obtain NiCO 3 and MnCO 3 Co-precipitate;

[0028] (3) The precipitate is pretreated at 500°C;

[0029] (4) The pretreated powder and LiOH·H 2 O is mixed according to Li:(Ni+Mn) molar ratio 19:17;

[0030] (5) The uniformly mixed powder is kept at 850°C for 16 hours in an air atmosphere, then the furnace power is turned off, and the furnace is lowered to room temperature to obtain Li[Ni 5 / 12 Li 1 / 18 mn 19 / 36 ]O 2 (Li[Ni X Li 1 / 3-2X / 3 mn 2 / 3-X / 3 ]O 2 (X=5 / 12) powder.

example 3

[0032] (1) Weigh NiSO with a molar ratio of 3:5 4 ·6H 2 O and MnSO 4 ·H 2 O, dissolved in distilled water to form a mixed sulfuric acid solution;

[0033] (2) with Na 2 CO 3 As a precipitant, control pH=9 to obtain NiCO 3 and MnCO 3 Co-precipitate;

[0034] (3) The precipitate is pretreated at 700°C;

[0035] (4) The pretreated powder and LiOH·H 2 O is mixed according to Li:(Ni+Mn) molar ratio 5:4;

[0036] (5) The uniformly mixed powder is kept at 1000°C for 10 hours in an air atmosphere, then the furnace power is turned off, and the furnace is lowered to room temperature to obtain Li[Ni 1 / 3 Li 1 / 9 mn 5 / 9 ]O 2 (Li[Ni X Li 1 / 3-2X / 3 mn 2 / 3-X / 3 ]O 2 (X=1 / 3) powder.

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Abstract

This invention relates to a positive material of a stable sandwich used in Li ionic cells and its preparation method, in which, the formula of said material is Li[N1Xli1 / 3-2X / 3Mn2 / 3-X / 3]O2, and 0<X<1 / 2, which takes nitrate or sulfate of Ni and Mn as the raw material, carbonate as the precipitator to prepare co-precipitator with the pH value in the sphere of 8-11, the precursor-the co-precipitation product is pre-processed under 300-700deg.C and the powder mixed with Li salt is sintered under the normal air atmosphere and cooled in the oven.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis and the preparation of positive electrode materials for lithium ion batteries, and in particular relates to a stable layered structure positive electrode material for lithium ion batteries and a preparation method thereof. The specific material is Li[Ni X Li 1 / 3-2X / 3 mn 2 / 3-X / 3 ]O 2 , where 0<X<1 / 2. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific capacity, and long life, and their usage has been increasing at an annual growth rate of 13% in the past ten years. At present, LiCoO is generally used as the positive electrode material of commercial lithium-ion batteries. 2 . with LiCoO 2 In contrast, manganese-rich cathode materials are expected to become new cathode materials for lithium-ion batteries due to their rich manganese resources, low price, and less environmental pollution. Among such materials, layered LiMnO 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01G1/02
CPCY02E60/12Y02E60/10
Inventor 连芳张王斌徐利华刘庆国
Owner UNIV OF SCI & TECH BEIJING
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