Negative electrode active material, preparation method thereof, and lithium ion battery

A negative electrode active material, lithium ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsatisfactory electrochemical performance, unsatisfactory lithium ion battery, poor cycle stability, etc., and achieve good Application prospect, stable cycle performance, good electrical conductivity effect

Active Publication Date: 2016-11-30
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Abstract
  • Description
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Problems solved by technology

Traditionally, MnO 2 It is widely used as the positive electrode material of primary lithium batteries in the field of batteries, but it cannot be applied to secondary lithium-ion batteries due to its low reversible capacity and poor cycle stability.
[0005] In recent years, due to the MnO 2 With high theoretical specific capacity, and abundant natural resources, MnO 2 There is an increasing trend of research as a negative electrode material for lithium-ion batteries, however, MnO 2 The electrochemical performance is far from satisfactory, the first reversible specific capacity is low, and what is even more unacceptable is the extremely poor cycle performance, and the capacity decays rapidly after multiple cycles

Method used

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  • Negative electrode active material, preparation method thereof, and lithium ion battery
  • Negative electrode active material, preparation method thereof, and lithium ion battery
  • Negative electrode active material, preparation method thereof, and lithium ion battery

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preparation example Construction

[0020] The embodiment of the present invention provides a kind of preparation method of lithium ion negative electrode active material, it comprises the following steps:

[0021] S1, potassium permanganate (KMnO 4 ) mixed with hydrogen chloride (HCl) in water to form a solution; and

[0022] S2, the solution is subjected to a hydrothermal reaction in a hydrothermal kettle, the reaction temperature is 120°C~160°C, and the holding time is 0.5h~2h to generate MnO 2 secondary ball.

[0023] Specifically, in this step S1, potassium permanganate can be dissolved in water to configure a potassium permanganate solution, and then the potassium permanganate solution is mixed with a hydrochloric acid solution to form the solution, and the concentration of the hydrochloric acid used is greater than 36%. The solution is only composed of potassium permanganate, HCl and water, and does not contain other additives such as surfactants. In this solution, the molar ratio of potassium permang...

Embodiment 1

[0030] 1 millimolar (mmol) KMnO 4 and 4 mmol HCl (36% concentrated hydrochloric acid) were dissolved in 45 ml deionized water to form a solution. The solution was then transferred to a 65 ml volume hydrothermal kettle liner. Heat the sealed hydrothermal kettle to 140°C and keep it warm for 2 hours. After the completion of the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the black precipitate in the kettle was collected, centrifugally washed with deionized water to remove impurity ions, and then dried in air to obtain MnO 2 secondary ball.

[0031] MnO 2 The secondary ball is used as the negative electrode active material of the lithium ion battery to make the negative electrode sheet. The specific process is: MnO 2 The secondary ball and the conductive agent acetylene black are mixed evenly, and then the binder SBR / CMC is added to make a slurry, which is evenly coated on the copper foil, dried and cut into negative pole pieces. MnO 2 , ...

Embodiment 2

[0034] 1 mmol KMnO 4 and 10 mmol HCl (36% concentrated hydrochloric acid) were dissolved in 45 ml deionized water to form a solution. The solution was then transferred to a 65 ml volume hydrothermal kettle liner. Heat the sealed hydrothermal kettle to 120°C and keep it warm for 2 hours. After the completion of the reaction, the hydrothermal kettle was naturally cooled to room temperature, and the black precipitate in the kettle was collected, centrifugally washed with deionized water to remove impurity ions, and then dried in air to obtain MnO 2 secondary ball.

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Abstract

The invention provides a lithium ion battery negative electrode active material and a preparation method thereof. A preparation method of a negative active material, comprising the following steps: mixing potassium permanganate and hydrogen chloride in water to form a solution; Composed of potassium manganate, hydrogen chloride and water, the reaction temperature is 120 ° C ~ 160 ° C, the holding time is 0.5 hours ~ 2 hours, and the manganese dioxide secondary ball is produced. The invention also provides a lithium ion battery, the negative electrode active material of the lithium ion battery is composed of manganese dioxide secondary balls.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode active material, a preparation method thereof and a lithium ion battery. Background technique [0002] Graphite is mostly used as a negative electrode material for commercialization of lithium-ion batteries, but the theoretical lithium storage specific capacity of graphite materials is only 372mAh / g. In order to meet the needs of high-capacity lithium-ion batteries, it is very urgent and necessary to research and develop new high-capacity lithium-ion battery anode materials to replace the current commercially used graphite anode materials. [0003] Since Poizot et al first reported transition metal oxides (TMOs, transition metal oxides) as anode materials for lithium-ion batteries in 2000, transition metal oxides and other transition metal compounds (TMX) have attracted much attention as anode materials for lithium-ion batteries. Oxides of transition metals, such as Fe, Ni, Co, Cu, etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/131H01M4/1391
Inventor 陈敬波王要武何向明徐盛明赵骁方谋李建军王莉
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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