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Positive ion vacancy positive electrode material and preparation method thereof

A cathode material and cation technology, applied in the field of cation vacancy cathode materials and their preparation, can solve problems such as unsatisfactory rate performance, capacity loss, and rising cost of lithium-ion batteries, so as to improve cycle stability and rate performance and reduce production costs Effect

Active Publication Date: 2019-03-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, layered cathode materials have disadvantages such as unsatisfactory rate performance and poor cycle stability due to their two-dimensional ion channels.
[0004] Surface coating can significantly improve the cycle stability of layered cathode materials (Zhang et al., Advanced Materials, 2018, 30(29), 1801751-1801751), but these improvement measures are generally complicated in process and high in cost, which is not conducive to industrialization
[0005] Ion doping can increase the atomic layer spacing in layered cathode materials and improve the rate performance of layered cathode materials (Yu et al., Journal of Power Sources, 2016, 335, 65-75), but the introduction of irrelevant ions will cause crystal Lattice Mismatch and Capacity Loss
[0006] In addition, with the continuous consumption of lithium resources, the price of lithium resources has increased year by year, resulting in rising costs of lithium-ion batteries (Schmuch et al., Nature energy, 2018, 3, 267-278)

Method used

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  • Positive ion vacancy positive electrode material and preparation method thereof
  • Positive ion vacancy positive electrode material and preparation method thereof
  • Positive ion vacancy positive electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation formula is Li 0.7 [Li 0.2 mn 0.54 co 0.13 Ni 0.13 ]O 2 positive electrode material

[0032] (1) Preparation of precursors: According to the stoichiometric ratio (Mn: Co: Ni = 4: 1: 1), weigh manganese sulfate, cobalt sulfate, and nickel sulfate and dissolve them in 300ml deionized water to prepare a concentration of 1mol / L. Solution A. Then weigh 37.20g and 23.88g of sodium carbonate and dissolve in deionized water to prepare solution B. Add solution A to solution B through a peristaltic pump, while stirring slowly, the flow rate is 1.5ml / min, and the ambient temperature is 30°C. After mixing, the obtained suspension was left to stand for 24 hours, filtered, washed, and dried to obtain the precursor carbonate.

[0033] (2) Preparation of the final product: the obtained carbonate precursor was placed in a muffle furnace and calcined at 550° C. for 3 h to obtain an oxide precursor. After cooling, the oxide precursor is uniformly mixed with 24.94g ...

Embodiment 2

[0036] The preparation formula is Li 0.8 [Li 0.2 mn 0.6 Ni 0.2 ]O 2 positive electrode material

[0037] (1) Preparation of precursors: Weigh manganese chloride and nickel chloride and dissolve them in 300ml deionized water according to the stoichiometric ratio (Mn:Ni=3:1) to prepare a solution A with a concentration of 1mol / L. Then weigh 37.20g and 23.88g of sodium carbonate and dissolve in deionized water to prepare solution B. Add solution A to solution B through a peristaltic pump, while stirring slowly, the flow rate is 1.5ml / min, and the ambient temperature is 30°C. After mixing, the obtained suspension was left to stand for 24 hours, filtered, washed, and dried to obtain the precursor carbonate.

[0038] (2) Preparation of the final product: the obtained carbonate precursor was placed in a muffle furnace and calcined at 550° C. for 3 h to obtain an oxide precursor. After cooling, the oxide precursor is uniformly mixed with 27.71g of lithium carbonate (the molar r...

Embodiment 3

[0040] The preparation formula is Li 0.9 CoO 2 positive electrode material

[0041](1) Preparation of precursor: Weigh cobalt acetate and dissolve it in 300ml deionized water to prepare solution A with a concentration of 1mol / L. Then weigh 37.20g and 23.88g of sodium carbonate and dissolve in deionized water to prepare solution B. Add solution A to solution B through a peristaltic pump, while stirring slowly, the flow rate is 1.5ml / min, and the ambient temperature is 30°C. After mixing, the obtained suspension was left to stand for 24 hours, filtered, washed, and dried to obtain the precursor carbonate.

[0042] (2) Preparation of the final product: the obtained carbonate precursor was placed in a muffle furnace and calcined at 550° C. for 3 h to obtain an oxide precursor. After cooling, uniformly mix the oxide precursor with 19.95g lithium carbonate (the molar ratio of lithium ion to transition metal is Li / TM=0.9, the normal ratio is 1, relative to the molecular formula L...

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Abstract

The invention discloses a positive ion vacancy positive electrode material and a preparation method thereof, and relates to a lithium ion battery. The chemical formula of the positive ion vacancy positive electrode material is Lia [LibMncCodNie]Of. At least one of manganese salt, cobalt salt and nickel salt is dissolved in deionized water to prepare a mixed salt solution A; sodium carbonate and ammonium bicarbonate are dissolved in deionized water to prepare a solution B; the mixed salt solution A is added into the solution B to obtain a mixed solution; standing, filtering, washing and dryingare preformed on the mixed solution to obtain a carbonate precursor; the dried carbonate precursor is dried to obtain an oxide precursor; and the oxide precursor is mixed with the lithium salt to be subjected to sintering to obtain the positive ion vacancy positive electrode material. The precursor product obtained by a co-precipitation method is uniformly mixed and sintered with a proper amount of a lithium source which is lower than the stoichiometric ratio, so as to obtain a layered positive electrode material containing a large number of positive ion vacancies in the body phase. Accordingto the positive electrode material containing the positive ion vacancy, the use amount of the lithium source can be reduced, and the production cost is lowered.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a cation vacancy positive electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have developed rapidly since the 1990s and occupy an important position in the secondary battery market. However, with the advancement of technology, digital products, electric vehicles, drones and other fields have put forward requirements for lithium-ion batteries such as high energy density, long-term cycle stability, and fast charging and discharging (Schmuch et al., Nature energy, 2018, 3, 267- 278). [0003] Compared with olivine-type lithium iron phosphate and spinel-type lithium manganese oxide, layered lithium cobaltate and its derivatives have become the focus of current research because of their higher theoretical specific capacity. However, layered cathode materials have disadvantages such as unsatisfactory rate performance and poor cycle stabili...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 彭栋梁谢清水刘鹏飞何伟王来森
Owner XIAMEN UNIV