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Positive electrode lithium supplementing material and lithium ion battery comprising same

A technology for lithium-ion batteries and positive electrodes, which can be used in positive electrodes, battery electrodes, secondary batteries, etc., and can solve problems such as high residual alkali value and poor surface structure stability

Pending Publication Date: 2021-09-14
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the prior art Li 5 FeO 4 The material has relatively high residual alkali value and poor surface structure stability, etc., the present invention provides a positive electrode lithium supplement material and a lithium ion battery comprising the material

Method used

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  • Positive electrode lithium supplementing material and lithium ion battery comprising same
  • Positive electrode lithium supplementing material and lithium ion battery comprising same
  • Positive electrode lithium supplementing material and lithium ion battery comprising same

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Embodiment 1

[0050] (1) Weigh Li according to the molar ratio of Li element to Fe element is 5.01:1.0 2 CO 3 and FeCO 3 , high-speed mixing, mixing standard reference: After mixing, white spots or white lines that are invisible to the naked eye shall prevail;

[0051] (2) The mixture is synthesized once in a muffle furnace, and oxygen is introduced into the muffle furnace. The synthesis is carried out in two stages, and the synthesis temperature is 500°C / 5h in the low temperature section; 720°C / 8h in the middle temperature section;

[0052] (3) After the muffle furnace is naturally cooled, the material is taken out and passed through a 300-mesh sieve to obtain Li 5 FeO 4 ;

[0053] (4) Li will be obtained 5 FeO 4 Same as nanoscale ZrO 2 Mix evenly with a high mixer, where ZrO 2 The amount according to Li 5 FeO 4 0.135wt%, sintered at 600°C for 5 hours in an oxygen atmosphere, cooled naturally and took out the material to pass through a 300-mesh sieve to obtain the target ZrO 2 ...

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Abstract

The invention relates to a positive electrode lithium supplementing material and a lithium ion battery comprising the same. The lithium supplementing material is coated in a special surface coating mode, and the purposes of stabilizing the stability of the surface structure of the material and reducing the residual alkali value are achieved. Meanwhile, the problem of series of side reactions caused by a large amount of gas easily generated in the charging and discharging process and structural instability can be solved. Zirconium dioxide is used as a coating layer to coat the surface of Li5FeO4, on one hand, zirconium dioxide is used as a non-active material, has a porous structure and inhibits erosion of HF in an electrolyte to protect a Li5FeO4 body material, and meanwhile, free intercalation and deintercalation of lithium ions can be allowed; on the other hand, the zirconium dioxide react with residual lithium on the surface of the Li5FeO4, so that the residual alkali value of the material is reduced, the gas production problem of the battery is effectively inhibited, and a stable surface structure is obtained.

Description

[0001] This application claims the priority of the previous application submitted to the State Intellectual Property Office of China on March 29, 2021, with the patent application number 2021103368388, and the title of the invention is "a positive electrode lithium supplement material and a lithium ion battery including the material", The entirety of this prior application is incorporated by reference into the present application. technical field [0002] The invention belongs to the technical field of lithium ion batteries, and mainly relates to a positive electrode lithium supplement material and a lithium ion battery including the positive electrode lithium supplement material. Background technique [0003] At present, during the first charging process of commercial lithium-ion batteries, about 10wt% of the active lithium in the positive electrode material is consumed, and an irreversible and stable SEI film is formed on the surface of the negative electrode, resulting in ...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/04H01M4/131H01M4/1391H01M4/36H01M4/48H01M10/0525
CPCH01M4/525H01M4/131H01M4/366H01M4/0471H01M4/483H01M4/1391H01M2004/028H01M10/0525Y02E60/10
Inventor 高智伍鹏曾家江李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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