Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cycling Li-O2 Batteries via LiOH Formation and Decomposition   The rechargeable aprotic Li-air (O2) battery is a promising potential
technology for next generation energy storage, but its practical realization
still faces many challenges. In contrast to the standard Li-O2 cells, which
cycle via the formation of Li2O2, we use a reduced graphene oxide electrode,
the additive LiI, and the solvent dimethoxyethane to reversibly form/remove
crystalline LiOH with particle sizes > 15 um during discharge/charge. This
leads to high specific capacities, excellent energy efficiency (93.2%) with a
voltage gap of only 0.2 V, and impressive rechargeability. The cells tolerate
high concentrations of water, water being the dominant proton source for the
LiOH; together with LiI it has a decisive impact on the chemical nature of the
discharge product and battery performance.

28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg