Lithium ion battery cathode material with variable slope concentration gradient doping structure and preparation thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of lithium ion battery positive electrode materials with variable slope concentration gradient doping structure and its synthesis field, can solve the problems of limiting large-scale application process, material capacity and rate decay, etc.

Inactive Publication Date: 2018-10-12
HARBIN INST OF TECH
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Problems solved by technology

[0005] A large number of studies have proved that the modification of lithium-ion battery cathode materials by element doping can greatly improve its structural stability, reduce phase transition, volume change, and dissolution of transition metal elements during charge-discharge cycles, thereby improving its cycle life and Safety, but conventional element doping usually leads to problems such as the decline of material capacity and rate, which limits its large-scale application process

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  • Lithium ion battery cathode material with variable slope concentration gradient doping structure and preparation thereof
  • Lithium ion battery cathode material with variable slope concentration gradient doping structure and preparation thereof
  • Lithium ion battery cathode material with variable slope concentration gradient doping structure and preparation thereof

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preparation example Construction

[0040] The invention provides a method for preparing a positive electrode material of a lithium ion battery with a variable slope concentration gradient doping structure, which specifically includes the following steps:

[0041] (1) Solution configuration: Prepare a precipitant aqueous solution with a concentration of 0.01mol / L~5mol / L, a complexing agent aqueous solution with a concentration of 0.02mol / L~15mol / L, and a metal salt solution with a concentration of 0.01mol / L~4mol / L , 0.01-2mol / L doping element solutions e and f; wherein at least one of e and f contains one or more doping elements, and the concentrations of the same type of metal ions contained in e and f are different;

[0042] (2) Preparation of precursor: Dilute the complexing agent aqueous solution c prepared in step (1) into an aqueous solution with a concentration of 0.01 mol / L to 5 mol / L, and then add it to a continuously stirring liquid phase reactor as the initial reaction bottom After starting the reacti...

Embodiment 1

[0052] Prepare a mixed metal salt solution d of nickel sulfate, cobalt sulfate and manganese sulfate with a molar ratio of Ni:Co:Mn=8:1:1 and a total concentration of 2.0mol / L, and prepare isopropanol with a concentration of 0.2mol / L Aluminum e solution and concentration are 0.1mol / L aluminum isopropoxide f solution, 4.0mol / L complexing agent ammonia solution c, 2.0mol / L precipitant sodium hydroxide solution b;

[0053] Get the complexing agent ammonia solution of 4.0mol / L and dilute it into the ammonia solution of 0.5mol / L and join in the reactor as the bottom liquid of reaction, in inert N 2 Under the protection of the atmosphere, the reaction bottom liquid was heated to 50°C, and then the aluminum isopropoxide e solution was gradually pumped into the continuously stirring aluminum isopropoxide solution f at a rate of 0.5L / h, and then the solution in f was pumped into 1L The rate of / h is gradually pumped into the coprecipitation reactor, and at the same time, the mixed meta...

Embodiment 2

[0056] The difference between this embodiment and Example 1 is that the precipitation agent is a mixture of sodium hydroxide and lithium hydroxide, and the molar ratio of the two is 1:1; the lithium source is a mixture of lithium hydroxide, lithium nitrate and lithium sulfate, and hydrogen The molar ratio of lithium oxide: lithium nitrate: lithium sulfate is 1:1:2.

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Abstract

The invention discloses a lithium ion battery cathode material with a variable slope concentration gradient doping structure and a synthesis method thereof. For solving the problems of capacity fadingand rate performance degradation which are brought by the conventional doping method, an element with a variable slope concentration gradient structure is doped, thereby obtaining the lithium ion battery cathode material with the concentration of a doping element continuously changed from the center of a material particle to the surface of the material particle; and change rate is gradually increased from inside to outside, so that the concentration of the doped element inside the material is slowly changed, the concentration of the doped element on the surface of the material is rapidly changed, and change of the concentration of the doped element is mainly concentrated on a surface layer. The method improves stability of the internal structure and the surface of the material while sideeffect is not introduced, the problems such as phase change of the material, volume change and dissolution of transition metal elements in a charge-discharge cycle process are reduced, cycle life of the material is greatly prolonged, and safety performance of the material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials and manufacturing techniques thereof, and in particular relates to a lithium-ion battery cathode material with a variable-slope concentration gradient doping structure and a synthesis method thereof. Background technique [0002] With the advancement of science and technology and the rapid development of human society, people's demand for energy continues to grow. However, fossil fuels such as coal, oil, and natural gas, which are the main energy sources, are exploited and used in large quantities, which makes these non-renewable fossil energy sources exhausted day by day, and the problem of energy crisis is becoming more and more severe. The two major problems of energy shortage and environmental degradation have become the most severe challenges facing modern human society, seriously restricting economic development and social progress. [0003] Lithium-ion battery is curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525H01M4/04
CPCH01M4/0471H01M4/362H01M10/0525Y02E60/10
Inventor 杜春雨徐星鉴纪源耿天凤贺晓书尹鸽平左朋建程新群霍华马玉林高云智
Owner HARBIN INST OF TECH
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