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Core-shell lithium manganate composite anode material as well as preparation method and application thereof

A composite cathode material, shell-type lithium manganate technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as limiting the wide application of materials, and achieve the effect of excellent cycle performance

Active Publication Date: 2012-08-22
甘肃大象能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Jahn-Teller effect leads to lattice distortion and electrolyte decomposition leads to manganese dissolution, resulting in faster capacity decay during charge-discharge cycles, especially at high temperatures, which greatly limits the wide application of this material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare a polyvinyl alcohol aqueous solution with a concentration of 5.0 wt%. Take 3.14kg of lithium carbonate, 16.95kg of manganese dioxide, 0.26kg of aluminum hydroxide and 0.39kg of lithium fluoride, mix them uniformly by ball milling, add 23.05kg of deionized water and 2.30kg of polyvinyl alcohol Vinyl alcohol solution, prepared into slurry, spray granulation to obtain spherical lithium manganate precursor; the precursor was calcined at 750 ° C for 12 hours to obtain spherical lithium manganate; lithium aluminate LiAlO 2 0.09kg of powder, 17.95kg of deionized water and 0.37kg of polyvinyl alcohol solution were mixed evenly by ball milling, and 18.32kg of spherical lithium manganate was added to prepare a slurry, which was then dried while stirring; the dried material was calcined at 650°C for 4 hours to obtain nucleus- Shell-type lithium manganate composite positive electrode material, attached table number A1.

Embodiment 2

[0027] Prepare a polyvinyl alcohol aqueous solution with a concentration of 5.0 wt%. Take 3.69kg of lithium carbonate, 16.52kg of manganese dioxide, 0.76kg of chromium trioxide and 0.26kg of lithium fluoride, mix them uniformly by ball milling, add 16.98kg of deionized water and 4.25kg of Polyvinyl alcohol solution, prepared into slurry, spray granulation to obtain spherical lithium manganate precursor; the precursor was calcined at 800 °C for 10 hours to obtain spherical lithium manganate; lithium aluminate LiAlO 2 0.18kg of powder, 17.76kg of deionized water and 0.55kg of polyvinyl alcohol solution were mixed evenly by ball milling, and 18.31kg of spherical lithium manganate was added to prepare a slurry, which was then dried while stirring; the dried material was calcined at 550°C for 6 hours to obtain the core Shell-type lithium manganate composite positive electrode material, attached table number A2.

Embodiment 3

[0029] Prepare a polyvinyl alcohol aqueous solution with a concentration of 5.0 wt%. Take 4.06kg of lithium carbonate, 16.08kg of manganese dioxide, 1.78kg of nickel carbonate and 0.13kg of lithium fluoride, mix them evenly by ball milling, add 12.03kg of deionized water and 6.01kg of polyethylene Alcohol solution, prepared into slurry, spray granulation to obtain spherical lithium manganate precursor; the precursor was calcined at 850 °C for 8 hours to obtain spherical lithium manganate; lithium aluminate LiAlO 2 0.37kg of powder, 17.88kg of deionized water and 0.74kg of polyvinyl alcohol solution were mixed evenly by ball milling, and 18.34kg of spherical lithium manganate was added to make a slurry, which was then dried while stirring; the dried material was calcined at 450°C for 8 hours to obtain nucleus- Shell-type lithium manganate composite positive electrode material, attached table number A3.

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PUM

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Abstract

The invention discloses a preparation method and an application of a core-shell lithium manganate composite anode material, belonging to the technical field of the preparation of the electrochemical power supply materials. The lithium manganate composite anode material is formed into a core-shell structure composed of 80-99.0wt% of core active material and 0.1-20wt% of shell layer material, wherein the core active material refers to spherical lithium manganate expressed by nominal composition formula LiaMn2-xAyO4-zB delta, while the shell layer material refers to lithium aluminate LiAlO2. The invention also discloses the method for preparing the anode material and a secondary lithium ion battery comprising the anode material. The anode material obtained by the method obviously improves the cyclic service life of the lithium manganate anode material and is capable of meeting the requirements of the common secondary lithium ion battery and the common power lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials. In particular, it relates to a core-shell type lithium manganate composite positive electrode material that can be used as a positive electrode material for lithium ion batteries, a preparation method and reference thereof. Background technique [0002] Lithium manganate cathode material has many advantages such as rich resources, low price, non-toxic and pollution-free, high working voltage, high-power charge and discharge, and good safety performance. It is an ideal lithium-ion battery cathode material. Since 1983 Thackeray et al. In Lithium insertion into manganese spines[J]. Since the first report in Materials Research Bulletin, 1983, 18(4): 461-472, this material has been extensively studied and applied. The Jahn-Teller effect leads to lattice distortion and electrolyte decomposition leads to manganese dissolution, resulting in faster capacity ...

Claims

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Application Information

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IPC IPC(8): H01M4/505
CPCY02E60/10
Inventor 田勇李辉胡平葛宏伟罗绍华诸葛福长
Owner 甘肃大象能源科技有限公司
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