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A kind of preparation method of metal/transition metal oxide composite negative electrode material for lithium ion battery

A technology for lithium-ion batteries and anode materials, which is applied in the field of preparation of metal/transition metal oxide composite anode materials for lithium-ion batteries, can solve the problems of low electron transport capacity, low electrical conductivity, and poor electrical conductivity, and achieve improved electronic performance. Low electrical conductivity, simple preparation process, and the effect of reducing interface resistance

Active Publication Date: 2020-07-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, transition metal oxide nanomaterials, as the next-generation lithium-ion battery anode materials, still have problems such as poor electrical conductivity and low electron transport ability that need to be solved in their wide application. In order to effectively solve this problem, the preparation of metal / metal oxide composites Negative electrode materials are a good direction. Metals with high electronic conductivity on the surface of nanoparticles can improve the defects of low electronic conductivity of transition metal oxides, and at the same time reduce the interface resistance between oxide particles, which is the development of negative electrode materials for lithium-ion batteries. provide new direction

Method used

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  • A kind of preparation method of metal/transition metal oxide composite negative electrode material for lithium ion battery
  • A kind of preparation method of metal/transition metal oxide composite negative electrode material for lithium ion battery
  • A kind of preparation method of metal/transition metal oxide composite negative electrode material for lithium ion battery

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Embodiment 1

[0032] Using oxalic acid as a precipitating agent, the Ni / MnO composite transition metal oxide anode material was prepared by selective thermal reduction, as follows:

[0033](1) Weigh 0.124g (0.5mmol) nickel acetate tetrahydrate and 1.225g (5mmol) manganese acetate tetrahydrate respectively in a beaker, then add 10mL H 2 O and 40mL C 2 h 5 OH is dissolved to obtain a composite metal salt solution;

[0034] (2) Weigh 0.693g (5.5mmol) oxalic acid in a beaker, then add 10mL H 2 O and 40mL LC 2 h 5 OH is dissolved to obtain oxalic acid solution;

[0035] (3) Pour the previously dissolved composite metal acetate solution into the oxalic acid solution under constant stirring, and stir for 7 hours to obtain the oxalate composite metal precursor;

[0036] (4) Drying the oxalate composite metal precursor obtained in step (3) in an electrothermal constant temperature blast drying oven at 100°C for 9 hours to remove moisture and ethanol therein;

[0037] (5) the dried product in ...

Embodiment 2

[0040] Using oxalic acid as a precipitant, the Cu / MnO composite transition metal oxide anode material was prepared by selective thermal reduction, as follows:

[0041] (1) Weigh 0.100g (0.5mmol) copper acetate monohydrate and 1.225g (5mmol) manganese acetate tetrahydrate respectively in a beaker, then add 10mL H 2 O and 70mL C 2 h 5 OH is dissolved to obtain a composite metal salt solution;

[0042] (2) Weigh 0.693g (6.5mmol) of oxalic acid in a beaker, then add 15mL of H 2 O and 50mL LC 2 h 5 OH is dissolved to obtain oxalic acid solution;

[0043] (3) Pour the previously dissolved composite metal acetate solution into the oxalic acid solution under constant stirring, and stir for 7 hours to obtain the oxalate composite metal precursor;

[0044] (4) Drying the oxalate composite metal precursor obtained in step (3) in an electrothermal constant temperature blast drying oven at 100°C for 9 hours to remove moisture and ethanol therein;

[0045] (5) the dried product in st...

Embodiment 3

[0048] Using sodium bicarbonate as a precipitating agent, a Cu / NiO composite transition metal oxide negative electrode material was prepared by selective thermal reduction, as follows:

[0049] (1) Weigh 0.1mmol of copper sulfate and 2.5mmol of nickel sulfate in a beaker, and then add 80mL of H 2 O and 8mL LC 2 h 5 OH is dissolved to obtain a composite metal salt solution;

[0050] (2) Weigh 25mmol of sodium bicarbonate in a beaker, and then add 100mL of H2CO3 2 O and 5mL LC 2 h 5 OH is dissolved to obtain sodium bicarbonate solution;

[0051] (3) Pour the previously dissolved composite metal sulfate solution into the sodium bicarbonate solution under constant stirring, and stir for 3 hours to obtain a carbonate composite metal precursor;

[0052] (4) Drying the carbonate composite metal precursor obtained in step (3) in a 100° C. electric thermostat blast drying oven for 5 hours to remove moisture and ethanol therein;

[0053] (5) the dried product in step (4) is heate...

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Abstract

The invention discloses a metal / transition metal oxide composite negative electrode material for a lithium-ion battery and a preparation method of the metal / transition metal oxide composite negative electrode material. The structural formula of the negative electrode material is M1O / M2O; two composite metal salt precursors containing metal elements M1 and M2 are decomposed into a composite metal oxide M1O / M2O under a high-temperature condition and are burnt in high-temperature reducing gas mixture atmosphere; and the precursors containing the elements M1 and M2 have a difference in oxidation-reduction electrode potential, so that the M1O with relatively high oxidation-reduction potential is selectively reduced into a metal M1 in situ through a reducing gas and the M2O can be kept in an oxidation state and is reduced in situ to obtain the metal M1 / metal oxide M2O composite negative electrode material. The metal / transition metal oxide composite negative electrode material is simple in preparation method and has very high applicability and universality to the precursors prepared through multiple methods, the electronic conductivity of the transition metal oxide M2O is effectively improved through the uniformly distributed metal M1 prepared through in-situ reduction, and the rate capability of the material is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of negative electrode materials for lithium ion batteries, in particular to a method for preparing metal / transition metal oxide composite negative electrode materials for lithium ion batteries. Background technique [0002] In the 21st century, with the development of economy and society, people's demand for energy continues to increase. Among them, replacing traditional fossil energy with chemical power can effectively alleviate the energy crisis and environmental pollution problems. Due to the outstanding advantages of high energy density, high open circuit voltage, long cycle life, low self-discharge rate, no memory effect and green environmental protection, lithium-ion batteries are widely used in portable electronic markets, electric vehicles, aerospace and other fields. However, the current lithium-ion battery technology cannot meet the ever-increasing demand for energy density, and has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/525H01M4/505H01M10/0525
CPCH01M4/362H01M4/38H01M4/48H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李昇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY CO LTD CO LTD