Ternary positive electrode composite material and preparation method and application thereof

A technology of composite materials and positive electrode materials, which is applied in the field of ternary positive electrode composite materials and its preparation, can solve the problems of surface structure damage of positive electrode materials, influence of electrochemical performance of materials, environmental protection pressure of washing water, etc., and achieves uniform distribution and coating effect. Unaffected, low microwave temperature effect

Active Publication Date: 2020-05-01
LANGFANG GREEN IND TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of reducing residual alkali by washing is relatively complicated, which will cause a lot of waste of water resources, and the discharge of washing water will cause a certain pressure on environmental protection. If the washing process is not handled properly, the surface structure of the positive electrode material will be affected to varying degrees due to repeated washing. The damage of the material will affect the electrochemical performance of the material

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  • Ternary positive electrode composite material and preparation method and application thereof

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Embodiment 1

[0073] Among the positive electrode materials described in this embodiment, the ternary positive electrode material is nickel-cobalt lithium manganese oxide, and the molar ratio of nickel, cobalt and manganese is Ni:Co:Mn=7:1: 1. The mass percentage of the first coating is 10%, the second coating is the carbonized product of polyvinyl alcohol, and the usage amount of polyvinyl alcohol is 0.1%,

[0074] In the first cladding, conductive polymer / graphene / carbon nanotube composite, hydrogen-containing lithium titanium oxide compound and FeF 3 (H 2 O) 0.33 The mass ratio of the conductive polymer, graphene and carbon nanotubes in the conductive polymer / graphene / carbon nanotube composite is 1:1.5:1.5;

[0075] The preparation method of described cathode material comprises the following steps:

[0076] (1) polyvinyl alcohol PVA is dissolved in water, is mixed with solution A;

[0077] (2) Add the first coating to the solution A obtained in step (1), stir well to obtain solution ...

Embodiment 2

[0084] Among the positive electrode materials described in this embodiment, the ternary positive electrode material is nickel-cobalt lithium manganese oxide, and the molar ratio of nickel, cobalt and manganese is Ni:Co:Mn=6:2: 2. The mass percentage of the first coating is 0.5%, the second coating is the carbonized product of polyvinyl alcohol, and the usage amount of polyvinyl alcohol is 2%,

[0085] In the first cladding, conductive polymer / graphene / carbon nanotube composite, hydrogen-containing lithium titanium oxide compound and FeF 3 (H 2 O) 0.33 The mass ratio is 7:2.5:0.5; the mass ratio of conductive polymer, graphene and carbon nanotube in the conductive polymer / graphene / carbon nanotube composite is 0.2:3:0.8;

[0086] (1) polyvinyl alcohol PVA is dissolved in ethanol, is mixed with solution A;

[0087] (2) Add the first coating to the solution A obtained in step (1), stir well to obtain solution B;

[0088] (3) adding the ternary positive electrode material into ...

Embodiment 3

[0094] Among the positive electrode materials described in this embodiment, the ternary positive electrode material is nickel-cobalt lithium manganese oxide, and the molar ratio of nickel, cobalt and manganese is Ni:Co:Mn=5:3: 2. The mass percentage of the first coating is 15%, the second coating is the carbonized product of polyvinyl alcohol, and the usage amount of polyvinyl alcohol is 0.5%.

[0095] In the first cladding, conductive polymer / graphene / carbon nanotube composite, hydrogen-containing lithium titanium oxide compound and FeF 3 (H 2 O) 0.33 The mass ratio is 9.4:0.5:0.1; the mass ratio of conductive polymer, graphene and carbon nanotube in the conductive polymer / graphene / carbon nanotube composite is 2:0.1:2.6;

[0096] The preparation method of described cathode material comprises the following steps:

[0097] (1) polyvinyl alcohol PVA is dissolved in ethanol, is mixed with solution A;

[0098] (2) Add the first coating to the solution A obtained in step (1), s...

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Abstract

The invention discloses a ternary positive electrode composite material and a preparation method and application thereof. The composite material comprises a ternary positive electrode material core and a shell coating the surface of the core, and the shell comprises a first coating material and a second coating material; the first coating is of a three-dimensional nano-network layered structure and comprises a conductive polymer/graphene/carbon nanotube compound, a hydrogen-containing lithium titanium oxide compound and FeF3(H2O)0.33, the hydrogen-containing lithium titanium oxide compound andthe FeF3 (H2O) 0.33 are dispersed on the surface of the compound in situ, and the second coating material is a carbonization product of polyvinyl alcohol. The lithium ion battery prepared from the ternary positive electrode composite material has relatively high ionic conductivity and electronic conductivity, and has the outstanding advantages of high specific discharge capacity, high initial coulombic efficiency, high cycling stability and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, in particular to the technical field of preparation of cathode materials for lithium-ion secondary batteries, and relates to a ternary cathode composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, good cycle stability, and environmental friendliness, and are widely used in electric vehicles, notebook computers, and mobile phones. As the key material in lithium-ion batteries, cathode materials play a vital role in the performance of batteries. Compared with other cathode materials, ternary materials have the advantages of high specific capacity and low preparation cost, and have good prospects for commercial application. However, in the application process of ternary materials, there are problems of mixed ions and high residual alkali on the sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/60H01M4/62H01M10/0525C01B32/182
CPCC01B32/182H01M4/366H01M4/485H01M4/505H01M4/525H01M4/602H01M4/625H01M10/0525Y02E60/10
Inventor 谭强强徐宇兴
Owner LANGFANG GREEN IND TECH CENT
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