Preparation method of carbon-coated lithium manganese borate cathode material for lithium ion battery

A carbon-coated technology for lithium manganese borate and lithium ion batteries, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor performance consistency of synthetic materials, and achieve low processing costs, uniform phase structure, and heavy weight. good effect

Inactive Publication Date: 2014-09-24
盐城市新能源化学储能与动力电源研究中心
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  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN102386418A uses boric acid, lithium nitrate and manganese nitrate as precursors to make jelly. The lithium manganese borate cathode material coated with carbon nanotubes has a discharge capacity of 185mAh / g for the first time, and the capacity is still close to 180mAh / g after 20 cycles. Problems such as poor performance consistency of synthetic materials

Method used

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  • Preparation method of carbon-coated lithium manganese borate cathode material for lithium ion battery
  • Preparation method of carbon-coated lithium manganese borate cathode material for lithium ion battery
  • Preparation method of carbon-coated lithium manganese borate cathode material for lithium ion battery

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Embodiment 1

[0031] A method for preparing a carbon-coated lithium manganese borate positive electrode material for a lithium ion battery, the preparation process comprising the following process steps:

[0032] 1. Mix 1.7956g lithium acetate dihydrate (0.0176 mol Li), 4.1895g manganese acetate tetrahydrate (0.0171 mol Mn), 1.0573g boric acid (0.0171 mol B) and 2.0171g citric acid (0.0105 mol), and then add an appropriate amount of Deionized water, dissolving lithium acetate dihydrate, manganese acetate tetrahydrate, boric acid and citric acid to form a solution, stirring continuously at 80°C to slowly evaporate the water until a sol is formed, and then drying the sol at 90°C;

[0033] 2. Pre-fired at 350°C under the protection of argon for 3 hours, ground for 10 minutes after natural cooling, pressed into tablets under a pressure of 10 MPa, calcined at 850°C under the protection of argon for 12 hours, and ground after natural cooling to obtain a carbon-coated manganese lithium borate posit...

Embodiment 2

[0038] A method for preparing a carbon-coated lithium manganese borate positive electrode material for a lithium ion battery, the preparation process comprising the following process steps:

[0039] 1. Mix 0.7003g lithium oxalate (0.0137 mol Li), 1.9296g manganese oxalate (0.0135 mol Mn), 0.8889g ammonium borate tetrahydrate (0.0135 mol B) and 2.1081g glucose (0.0117 mol), then add an appropriate amount of deionized Water, dissolve lithium oxalate, manganese oxalate, ammonium borate tetrahydrate and glucose to form a solution, stir continuously at 60°C to slowly evaporate the water until a sol is formed, and then dry the sol at 100°C;

[0040] 2. Pre-fired at 300°C for 4 hours under the protection of nitrogen, and ground for 5 minutes after natural cooling, pressed into tablets under a pressure of 20 MPa, calcined at 800°C for 24 hours under the protection of a mixture of argon and hydrogen (the hydrogen content is 8%), and cooled naturally The carbon-coated lithium manganese ...

Embodiment 3

[0043] A method for preparing a carbon-coated lithium manganese borate positive electrode material for a lithium ion battery, the preparation process comprising the following process steps:

[0044] 1. Mix 0.6145g lithium carbonate (0.0166 mol Li), 1.8290g manganese carbonate (0.0159 mol Mn), 1.0469g ammonium borate tetrahydrate (0.0159 mol B) and 1.1846g sucrose (0.0035 mol), then add an appropriate amount of deionized Water, dissolve lithium carbonate, manganese carbonate, ammonium borate tetrahydrate and sucrose to form a solution, stir continuously at 90°C to slowly evaporate the water until a sol is formed, and then dry the sol at 80°C;

[0045] 2. Pre-calcined at 350°C for 5 hours under the protection of argon gas, ground for 10 minutes after natural cooling, pressed into tablets under a pressure of 15 MPa, and calcined for 24 hours under the protection of a mixture of nitrogen and hydrogen (hydrogen content is 5%) at 750°C, after natural cooling The carbon-coated lithiu...

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Abstract

The invention relates to a preparation method of a carbon-coated lithium manganese borate cathode material for a lithium ion battery, belonging to the technical field of lithium ion batteries. The preparation method of the carbon-coated lithium manganese borate cathode material for the lithium ion battery comprises the following process steps of (1) mixing a lithium source compound, a manganese source compound, a boron source compound and a carbon source compound according to the molar ratio that Li to Mn to B to a carbon source is equal to (1-1.05) to 1 to 1 to (0.1-1.0), then, adding deionized water to form a solution, next, continuing to stir at the temperature of 50-90 DEG C to slowly evaporate water to form sol, and then, drying the sol at the temperature of 70-110 DEG C; (2) presintering under the protection of inert gases and at the temperature of 300-400 DEG C for 3-5h, grinding for 5-10min after naturally cooling, flaking at the pressure of 5-20MPa, calcining under the protection of inert gases and at the temperature of 700-850 DEG C for 12-24h, and grinding after naturally cooling to obtain the carbon-coated lithium manganese borate cathode material. The preparation method has the advantages of simple process route, good repeatability, suitability for industrial production and low manufacturing cost; in addition, the prepared material is uniform in particle size distribution, favorable in electrochemical property and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a method for preparing a carbon-coated lithium manganese borate cathode material for lithium ion batteries. Background technique [0002] At present, the electrochemical performance of lithium-ion batteries mainly depends on electrode materials and electrolytes, among which the positive electrode material is the most critical part of lithium-ion batteries, because it largely determines the overall cost, capacity, service life and safety performance etc. According to the material structure, it is mainly divided into three categories: one is layered structure materials, the other is spinel structure materials, and the third is polyanionic olivine structure materials. [0003] In recent years, lithium transition metal borates containing polyanions have attracted much attention as novel cathode materials for lithium-ion batteries. with LiMnPO 4 In contrast, the phosp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 于海艳吕荣冠王坚焦昌梅左玉香
Owner 盐城市新能源化学储能与动力电源研究中心
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