Additive for anode material of lithium ion battery, preparation method of additive, positive electrode material containing additive and lithium ion battery

A lithium-ion battery and positive electrode material technology, which is applied in the direction of battery electrodes, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of affecting battery performance, poor cycle performance of lithium-ion batteries, and poor pulping and sheeting effects, etc.

Inactive Publication Date: 2017-06-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing lithium supplementing materials cannot exist stably in the air for a long time and that impurities introduced into various lithium supplementing means seriously affect the performance of the battery and the cycle performance of the lithium ion battery is not good. In order to solve the problem of poor pulping and tableting effect in the process, we provide a lithium ion battery that has the function of supplementing lithium ions and meets the high requirements of lithium ion batteries for stability, safety, and cycle performance, and has a good pulping and tableting effect during the preparation process. Battery positive electrode material additive and its preparation method, positive electrode material containing the additive and lithium ion battery, the application provides a lithium ion battery positive electrode material additive, the additive has a core-shell structure, and the core material includes a silane coupling agent Modified inorganic lithium salt, the shell material includes a low melting point polymer and a conductive carbon material, and the porosity of the shell is 0.01% to 20%

Method used

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  • Additive for anode material of lithium ion battery, preparation method of additive, positive electrode material containing additive and lithium ion battery
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  • Additive for anode material of lithium ion battery, preparation method of additive, positive electrode material containing additive and lithium ion battery

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preparation example Construction

[0032] The present invention also provides a preparation method of the positive electrode material additive for lithium ion batteries, the method comprising the following steps:

[0033] S1, using a silane coupling agent to modify the surface of the inorganic lithium salt to obtain a silane coupling agent-modified inorganic lithium salt;

[0034] S2. After fully dispersing the conductive carbon material in an organic solvent, mix it with the low melting point polymer and the inorganic lithium salt modified by the silane coupling agent in step S1, and heat until the organic solvent is completely volatilized, so that the low melting point polymer and the conductive carbon The material is coated on the surface of the inorganic lithium salt, and a composite material with a core-shell structure is obtained after drying.

[0035] According to the preparation method of the lithium ion battery cathode material additive of the present invention, preferably, the step S1 includes adding ...

Embodiment 1

[0074] (1) Prepare silane coupling agent solution according to the ratio of 20% silane coupling agent KH550, 72% ethanol, and 8% water;

[0075] (2) Take 50g LiNi 0.8 co 0.15 al 0.05 o 2 Add to the aqueous solution of ethanol and heat to 60°C to obtain a mixed solution;

[0076] (3) Slowly add 15ml of the silane coupling agent solution in step (1) to the mixed solution in step (2), and stir at 200rad / min until the solvent is completely evaporated. Put the remaining material in a vacuum drying oven at 150°C for drying, soak in ethanol after drying, wash, and centrifuge to obtain LiNi modified by silane coupling agent 0.8 co 0.15 al 0.05 o 2 ;

[0077] (4) Add 0.3 g of carbon nanotubes with an average particle size of 150 nm into 100 ml of decahydronaphthene for ultrasonic dispersion, then add it into a 500 ml three-necked round bottom flask, heat to 100 ° C, and stir at 200 rad / min;

[0078] (5) adding 10 g molecular weight to the mixed solution of step (4) is 3000 low...

Embodiment 2

[0081] The same treatment method as in Example 1, except that 0.4 g of carbon fibers with an average particle diameter of 500 nm was added in step (4) instead of carbon nanotubes to prepare lithium-ion battery cathode material additive A2.

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Abstract

The invention provides an additive for a positive electrode material of a lithium ion battery, a preparation method of the additive, a positive electrode material containing the additive and the lithium ion battery. The additive has a core-shell structure; a core material contains silane coupling agent modified inorganic lithium salt, and a shell material contains a low-melting-point polymer and a conductive carbon material; and the porosity of a shell is 0.01%-20%. By adding the additive into the positive electrode material of the lithium ion battery, rich lithium at a cathode is realized; and compared with a routine method of supplementing lithium to the positive electrode or the cathode by directly adding active lithium, the safety is relatively high.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery positive electrode material additive and a preparation method thereof, a positive electrode material containing the additive and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high discharge voltage, high energy density and long cycle life, so they are widely used in the field of portable electronic devices, and are also favored by some high-tech applications such as military, aerospace, and electric vehicles. [0003] At present, the negative electrode active material of commercial lithium-ion batteries mainly adopts graphite negative electrode, and the lithium intercalation potential of graphite negative electrode is lower than the reduction potential of electrolyte solvents such as PC, EC, DEC, etc., so the solvent will be reduced during charging. A layer of solid electrolyte membra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525H01M10/058
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 韩晓燕李世彩胡栋杰
Owner BYD CO LTD
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