Wide temperature aluminum ion battery based on cobalt boride/graphene composite material as positive electrode

Abstract

The invention relates to a wide-temperature aluminum ion battery based on a cobalt boride / graphene composite material as a positive electrode, and belongs to the field of batteries. Composite nano-cobalt boride and graphene, and use it as the positive electrode material of aluminum ion battery, so that the battery has two energy storage mechanisms, that is, redox mechanism and intercalation and extraction mechanism, and the special structure of nano-cobalt boride (crystalline region and Amorphous coexistence) makes the battery have better temperature characteristics. In combination with the above-mentioned composite material preparation method and battery test, the present invention can summarize the following characteristics: a novel composite material that can be applied to the aluminum ion battery system is obtained; the battery temperature performance test obtains excellent results, that is, in In the high temperature test, as the temperature rises, the battery capacity shows an upward trend. In the low temperature performance test, the discharge specific capacity can reach ~75mAh / g at 20°C and 500mA / g current density, and reach ‑30°C and 500mA / g The discharge specific capacity can still reach ~45mAh / g under the current density, the capacity retention rate is as high as 60%, and it has excellent low-temperature performance.

Description

Technical field [0001] The invention relates to an aluminum ion battery, in particular to a wide temperature (-30°C-60°C) aluminum ion battery based on a cobalt boride / graphene composite material as a positive electrode, and belongs to the battery field. Background technique [0002] With the increasing demand for clean energy storage, secondary electrochemical energy storage materials and devices have been widely explored. However, traditional lithium-ion batteries are currently facing severe challenges, including resource shortages and resulting cost increases, safety tests brought about by lithium metal negative electrodes and combustible organic electrolytes, and limited operating temperature ranges. All these have prompted people to develop new energy storage systems that are cheaper, safer and can work in a wide temperature range. [0003] At present, the emerging aluminum-ion battery has received widespread attention due to its advantages. Its main advantages include abunda...

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Problems solved by technology

A small number of researchers have conducted preliminary tests on the temperature performance of aluminum-ion batteries (documents: H.Chen, H.Xu, S.Wang, T.Huang, J.Xi, S.Cai, F.Guo, Z.Xu, W .Gao, C.Gao, Sci.Adv.2017, 3, eaao7233. Literature: C.J.Pan, C.Yuana, G.Zhua, Q.Zhang, C.J.Huang, M.C.Lin, M.Angell, B.J.Hwang, P.Kaghazchic , H.Dai, P.Natl.Acad.Sci.USA.2018, 115, 5670.), using graphite electrodes for experiments, but these studies are by constantly adjusting the electrochemical window to make the performance of the battery stable at different temperatures State, lack of practical operation feasibility, so it is particularly important to develop a new material system to regulate the wide temperature range of aluminum-ion batteries

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