Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for solvothermal synthesis of positive electrode materials for lithium ion batteries

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of limited product mixing uniformity, inability to accurately control molten salt, and large reaction energy consumption, so as to improve cycle stability, The effect of shortening the transmission distance and simple operation process

Active Publication Date: 2020-08-25
KUNMING UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although the high-temperature solid-phase synthesis method is simple in operation, the uniformity of product mixing is limited and long-term high-temperature treatment is required. In order to make the reaction complete, the material must be treated, the reaction consumes a lot of energy, the loss of lithium is serious, and it is easy to form a heterogeneous phase; sol - The gel method can achieve molecular level mixing, and the required calcination temperature is lower, but it needs to add a variety of chemicals during the reaction process, which is more complicated; the co-precipitation method is easy to control the distribution of cations to synthesize a uniform and stable product, and the operation process is more complicated , is a more commonly used synthetic method at present; the solvent (hydro) thermal method has a simple operation process, is not easy to introduce impurities, and can achieve molecular level mixing; the molten salt method uses less reagents and avoids the energy-consuming ball milling process, but requires Keep working at high temperature for a long time, and the amount of molten salt cannot be accurately controlled, resulting in cumbersome steps such as separation of the product and molten salt

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for solvothermal synthesis of positive electrode materials for lithium ion batteries
  • A method for solvothermal synthesis of positive electrode materials for lithium ion batteries
  • A method for solvothermal synthesis of positive electrode materials for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Configuration of the solvothermal reaction solution: at room temperature, CH 3 COOLi·2H 2 O, Ni (CH 3 COO) 2 4H 2 O, Co (CH 3 COO) 2 4H 2 O, Mn (CH 3 COO) 2 4H 2 Put O and urea into 65ml of diethylene glycol, stir for 1 hour, and make a mixed solution; in the mixed solution, CH 3 COOLi·2H 2 The concentration of O is 1.05mol / L, Ni (CH 3 COO) 2 4H 2 The concentration of O is 0.5mol / L, Co (CH 3 COO) 2 4H 2 The concentration of O is 0.2mol / L, Mn(CH 3 COO) 2 4H 2 The concentration of O is 0.3 mol / L, and the concentration of urea is 3.0 mol / L.

[0020] (2) Transfer the mixed solution obtained in step (1) to a 100ml magnetically stirred autoclave, and react at a temperature of 160°C for 10h.

[0021] (3) Suction filter the turbid liquid after the reaction in step (2), vacuum-dry the filter cake, and pass through a 300-mesh sieve after grinding. The ground powder is kept at 550°C for 6 hours, then heated to 850°C for 12 hours. , the final lithium-ion ba...

Embodiment 2

[0024] (1) Configuration of the solvothermal reaction solution: at room temperature, CH 3 COOLi·2H 2 O, Ni (CH 3 COO) 2 4H 2 O, Co (CH 3 COO) 2 4H 2 O, Mn (CH 3 COO) 2 4H 2 Put O and urea into 65ml of diethylene glycol, stir for 1 hour, and make a mixed solution; in the mixed solution, CH 3 COOLi·2H 2 The concentration of O is 1.05mol / L, Ni (CH 3 COO) 2 4H 2 The concentration of O is 0.5mol / L, Co (CH 3 COO) 2 4H 2 The concentration of O is 0.2mol / L, Mn(CH 3 COO) 2 4H 2 The concentration of O is 0.3 mol / L, and the concentration of urea is 3.0 mol / L.

[0025] (2) Transfer the mixed solution obtained in step (1) to a 100ml magnetically stirred autoclave, and react at a temperature of 180°C for 10h.

[0026] (3) Suction filter the turbid liquid after the reaction in step (2), vacuum-dry the filter cake, and pass through a 300-mesh sieve after grinding. The ground powder is kept at 550°C for 6 hours, then heated to 850°C for 12 hours. , the final lithium-ion ba...

Embodiment 3

[0029] (1) Configuration of the solvothermal reaction solution: at room temperature, CH 3 COOLi·2H 2 O, Ni (CH 3 COO) 2 4H 2 O, Co (CH 3 COO) 2 4H 2 O, Ni (CH 3 COO) 2 4H 2 Put O and urea into 65ml of diethylene glycol, stir for 1 hour, and make a mixed solution. CH in the mixed solution 3 COOLi·2H 2 The concentration of O is 1.0mol / L, Ni(CH 3 COO) 2 4H 2 The concentration of O is 0.8mol / L, Co (CH 3 COO) 2 4H 2 The concentration of O is 0.1mol / L, Mn (CH 3 COO) 2 4H 2 The concentration of O is 0.1 mol / L, and the concentration of urea is 5 mol / L.

[0030] (2) Transfer the mixed solution obtained in step (1) to a 100ml magnetically stirred autoclave, and react at a temperature of 160°C for 8h.

[0031] (3) Suction filter the turbid liquid after the reaction in step (2), vacuum-dry the filter cake, and pass through a 300-mesh sieve after grinding. The ground powder is kept at 550°C for 6 hours, then heated to 850°C for 12 hours. , the final lithium-ion batter...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a solvothermal synthesis method of a lithium ion battery positive electrode material, and belongs to the technical field of new energy lithium battery positive electrode materials. The solvothermal synthesis method comprises: dissolving an acetate and urea in an organic solvent, transferring the uniformly-mixed solution into a high pressure reaction kettle, decomposing theurea at a high temperature under a high pressure to obtain CO2 bubbles, carrying out a reaction on the CO2 bubbles and metal ions to form a crystal, and generating precipitate along with the growth ofthe crystal; and carrying out suction filtration on the obtained product, drying, doping lithium, grinding, and calcining to obtain the lithium ion battery positive electrode material. According to the present invention, with the prepared lithium ion battery positive electrode material, the charge and discharge capacity and the cycle stability of the battery can be improved.

Description

technical field [0001] The invention relates to a method for preparing positive electrode materials of lithium ion batteries by a solution heat method, and belongs to the technical field of new energy lithium battery positive electrode materials. Background technique [0002] Due to the higher theoretical specific capacity compared with olivine-type or spinel-type cathode materials, lithium transition metal oxides (LiMO 2 , M = Mn, Co, Ni, etc.) are considered to have great potential as cathode materials for high-energy and high-capacity batteries, but poor rate performance and cycle stability limit their large-scale production and application. [0003] The existing preparation methods of cathode materials for lithium-ion batteries mainly include high-temperature solid-phase synthesis, sol-gel method, co-precipitation method, solvent (hydro) thermal method and molten salt method. Among them, although the high-temperature solid-phase synthesis method is simple in operation, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/58
CPCH01M4/04H01M4/364H01M4/58Y02E60/10
Inventor 张正富王梓汤梦云吴天涯
Owner KUNMING UNIV OF SCI & TECH